Add pybind11 2.5 source

186 files changed, 41171 insertions, 0 deletions

diff --git a/3rdparty/pybind11/.appveyor.yml b/3rdparty/pybind11/.appveyor.yml
new file mode 100644
index 00000000..8fbb7261
--- /dev/null
+++ b/3rdparty/pybind11/.appveyor.yml
@@ -0,0 +1,70 @@
+version: 1.0.{build}
+image:
+- Visual Studio 2017
+- Visual Studio 2015
+test: off
+skip_branch_with_pr: true
+build:
+  parallel: true
+platform:
+- x64
+- x86
+environment:
+  matrix:
+  - PYTHON: 36
+    CPP: 14
+    CONFIG: Debug
+  - PYTHON: 27
+    CPP: 14
+    CONFIG: Debug
+  - CONDA: 36
+    CPP: latest
+    CONFIG: Release
+matrix:
+  exclude:
+    - image: Visual Studio 2015
+      platform: x86
+    - image: Visual Studio 2015
+      CPP: latest
+    - image: Visual Studio 2017
+      CPP: latest
+      platform: x86
+install:
+- ps: |
+    if ($env:PLATFORM -eq "x64") { $env:CMAKE_ARCH = "x64" }
+    if ($env:APPVEYOR_JOB_NAME -like "*Visual Studio 2017*") {
+      $env:CMAKE_GENERATOR = "Visual Studio 15 2017"
+      $env:CMAKE_INCLUDE_PATH = "C:\Libraries\boost_1_64_0"
+      $env:CXXFLAGS = "-permissive-"
+    } else {
+      $env:CMAKE_GENERATOR = "Visual Studio 14 2015"
+    }
+    if ($env:PYTHON) {
+      if ($env:PLATFORM -eq "x64") { $env:PYTHON = "$env:PYTHON-x64" }
+      $env:PATH = "C:\Python$env:PYTHON\;C:\Python$env:PYTHON\Scripts\;$env:PATH"
+      python -W ignore -m pip install --upgrade pip wheel
+      python -W ignore -m pip install pytest numpy --no-warn-script-location
+    } elseif ($env:CONDA) {
+      if ($env:CONDA -eq "27") { $env:CONDA = "" }
+      if ($env:PLATFORM -eq "x64") { $env:CONDA = "$env:CONDA-x64" }
+      $env:PATH = "C:\Miniconda$env:CONDA\;C:\Miniconda$env:CONDA\Scripts\;$env:PATH"
+      $env:PYTHONHOME = "C:\Miniconda$env:CONDA"
+      conda --version
+      conda install -y -q pytest numpy scipy
+    }
+- ps: |
+    Start-FileDownload 'http://bitbucket.org/eigen/eigen/get/3.3.3.zip'
+    7z x 3.3.3.zip -y > $null
+    $env:CMAKE_INCLUDE_PATH = "eigen-eigen-67e894c6cd8f;$env:CMAKE_INCLUDE_PATH"
+build_script:
+- cmake -G "%CMAKE_GENERATOR%" -A "%CMAKE_ARCH%"
+    -DPYBIND11_CPP_STANDARD=/std:c++%CPP%
+    -DPYBIND11_WERROR=ON
+    -DDOWNLOAD_CATCH=ON
+    -DCMAKE_SUPPRESS_REGENERATION=1
+    .
+- set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
+- cmake --build . --config %CONFIG% --target pytest -- /m /v:m /logger:%MSBuildLogger%
+- cmake --build . --config %CONFIG% --target cpptest -- /m /v:m /logger:%MSBuildLogger%
+- if "%CPP%"=="latest" (cmake --build . --config %CONFIG% --target test_cmake_build -- /m /v:m /logger:%MSBuildLogger%)
+on_failure: if exist "tests\test_cmake_build" type tests\test_cmake_build\*.log*
diff --git a/3rdparty/pybind11/.gitignore b/3rdparty/pybind11/.gitignore
new file mode 100644
index 00000000..979fd443
--- /dev/null
+++ b/3rdparty/pybind11/.gitignore
@@ -0,0 +1,38 @@
+CMakeCache.txt
+CMakeFiles
+Makefile
+cmake_install.cmake
+.DS_Store
+*.so
+*.pyd
+*.dll
+*.sln
+*.sdf
+*.opensdf
+*.vcxproj
+*.filters
+example.dir
+Win32
+x64
+Release
+Debug
+.vs
+CTestTestfile.cmake
+Testing
+autogen
+MANIFEST
+/.ninja_*
+/*.ninja
+/docs/.build
+*.py[co]
+*.egg-info
+*~
+.*.swp
+.DS_Store
+/dist
+/build
+/cmake/
+.cache/
+sosize-*.txt
+pybind11Config*.cmake
+pybind11Targets.cmake
diff --git a/3rdparty/pybind11/.gitmodules b/3rdparty/pybind11/.gitmodules
new file mode 100644
index 00000000..d063a8e8
--- /dev/null
+++ b/3rdparty/pybind11/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tools/clang"]
+	path = tools/clang
+	url = ../../wjakob/clang-cindex-python3
diff --git a/3rdparty/pybind11/.readthedocs.yml b/3rdparty/pybind11/.readthedocs.yml
new file mode 100644
index 00000000..c9c61617
--- /dev/null
+++ b/3rdparty/pybind11/.readthedocs.yml
@@ -0,0 +1,3 @@
+python:
+  version: 3
+requirements_file: docs/requirements.txt
diff --git a/3rdparty/pybind11/.travis.yml b/3rdparty/pybind11/.travis.yml
new file mode 100644
index 00000000..d81cd8c7
--- /dev/null
+++ b/3rdparty/pybind11/.travis.yml
@@ -0,0 +1,306 @@
+language: cpp
+matrix:
+  include:
+  # This config does a few things:
+  # - Checks C++ and Python code styles (check-style.sh and flake8).
+  # - Makes sure sphinx can build the docs without any errors or warnings.
+  # - Tests setup.py sdist and install (all header files should be present).
+  # - Makes sure that everything still works without optional deps (numpy/scipy/eigen) and
+  #   also tests the automatic discovery functions in CMake (Python version, C++ standard).
+  - os: linux
+    dist: xenial # Necessary to run doxygen 1.8.15
+    name: Style, docs, and pip
+    cache: false
+    before_install:
+    - pyenv global $(pyenv whence 2to3)  # activate all python versions
+    - PY_CMD=python3
+    - $PY_CMD -m pip install --user --upgrade pip wheel setuptools
+    install:
+    # breathe 4.14 doesn't work with bit fields. See https://github.com/michaeljones/breathe/issues/462
+    - $PY_CMD -m pip install --user --upgrade sphinx sphinx_rtd_theme breathe==4.13.1 flake8 pep8-naming pytest
+    - curl -fsSL https://sourceforge.net/projects/doxygen/files/rel-1.8.15/doxygen-1.8.15.linux.bin.tar.gz/download | tar xz
+    - export PATH="$PWD/doxygen-1.8.15/bin:$PATH"
+    script:
+    - tools/check-style.sh
+    - flake8
+    - $PY_CMD -m sphinx -W -b html docs docs/.build
+    - |
+      # Make sure setup.py distributes and installs all the headers
+      $PY_CMD setup.py sdist
+      $PY_CMD -m pip install --user -U ./dist/*
+      installed=$($PY_CMD -c "import pybind11; print(pybind11.get_include(True) + '/pybind11')")
+      diff -rq $installed ./include/pybind11
+    - |
+      # Barebones build
+      cmake -DCMAKE_BUILD_TYPE=Debug -DPYBIND11_WERROR=ON -DDOWNLOAD_CATCH=ON -DPYTHON_EXECUTABLE=$(which $PY_CMD) .
+      make pytest -j 2 && make cpptest -j 2
+  # The following are regular test configurations, including optional dependencies.
+  # With regard to each other they differ in Python version, C++ standard and compiler.
+  - os: linux
+    dist: trusty
+    name: Python 2.7, c++11, gcc 4.8
+    env: PYTHON=2.7 CPP=11 GCC=4.8
+    addons:
+      apt:
+        packages:
+          - cmake=2.\*
+          - cmake-data=2.\*
+  - os: linux
+    dist: trusty
+    name: Python 3.6, c++11, gcc 4.8
+    env: PYTHON=3.6 CPP=11 GCC=4.8
+    addons:
+      apt:
+        sources:
+          - deadsnakes
+        packages:
+          - python3.6-dev
+          - python3.6-venv
+          - cmake=2.\*
+          - cmake-data=2.\*
+  - os: linux
+    dist: trusty
+    env: PYTHON=2.7 CPP=14 GCC=6 CMAKE=1
+    name: Python 2.7, c++14, gcc 6, CMake test
+    addons:
+      apt:
+        sources:
+          - ubuntu-toolchain-r-test
+        packages:
+          - g++-6
+  - os: linux
+    dist: trusty
+    name: Python 3.5, c++14, gcc 6, Debug build
+    # N.B. `ensurepip` could be installed transitively by `python3.5-venv`, but
+    # seems to have apt conflicts (at least for Trusty). Use Docker instead.
+    services: docker
+    env: DOCKER=debian:stretch PYTHON=3.5 CPP=14 GCC=6 DEBUG=1
+  - os: linux
+    dist: xenial
+    env: PYTHON=3.6 CPP=17 GCC=7
+    name: Python 3.6, c++17, gcc 7
+    addons:
+      apt:
+        sources:
+          - deadsnakes
+          - ubuntu-toolchain-r-test
+        packages:
+          - g++-7
+          - python3.6-dev
+          - python3.6-venv
+  - os: linux
+    dist: xenial
+    env: PYTHON=3.6 CPP=17 CLANG=7
+    name: Python 3.6, c++17, Clang 7
+    addons:
+      apt:
+        sources:
+          - deadsnakes
+          - llvm-toolchain-xenial-7
+        packages:
+          - python3.6-dev
+          - python3.6-venv
+          - clang-7
+          - libclang-7-dev
+          - llvm-7-dev
+          - lld-7
+          - libc++-7-dev
+          - libc++abi-7-dev  # Why is this necessary???
+  - os: linux
+    dist: xenial
+    env: PYTHON=3.8 CPP=17 GCC=7
+    name: Python 3.8, c++17, gcc 7 (w/o numpy/scipy) # TODO: update build name when the numpy/scipy wheels become available
+    addons:
+      apt:
+        sources:
+          - deadsnakes
+          - ubuntu-toolchain-r-test
+        packages:
+          - g++-7
+          - python3.8-dev
+          - python3.8-venv
+    # Currently there is no numpy/scipy wheels available for python3.8
+    # TODO: remove next before_install, install and script clause when the wheels become available
+    before_install:
+      - pyenv global $(pyenv whence 2to3)  # activate all python versions
+      - PY_CMD=python3
+      - $PY_CMD -m pip install --user --upgrade pip wheel setuptools
+    install:
+      - $PY_CMD -m pip install --user --upgrade pytest
+    script:
+      - |
+        # Barebones build
+        cmake -DCMAKE_BUILD_TYPE=Debug -DPYBIND11_WERROR=ON -DDOWNLOAD_CATCH=ON -DPYTHON_EXECUTABLE=$(which $PY_CMD) .
+        make pytest -j 2 && make cpptest -j 2
+  - os: osx
+    name: Python 2.7, c++14, AppleClang 7.3, CMake test
+    osx_image: xcode7.3
+    env: PYTHON=2.7 CPP=14 CLANG CMAKE=1
+  - os: osx
+    name: Python 3.7, c++14, AppleClang 9, Debug build
+    osx_image: xcode9.4
+    env: PYTHON=3.7 CPP=14 CLANG DEBUG=1
+  # Test a PyPy 2.7 build
+  - os: linux
+    dist: trusty
+    env: PYPY=5.8 PYTHON=2.7 CPP=11 GCC=4.8
+    name: PyPy 5.8, Python 2.7, c++11, gcc 4.8
+    addons:
+      apt:
+        packages:
+          - libblas-dev
+          - liblapack-dev
+          - gfortran
+  # Build in 32-bit mode and tests against the CMake-installed version
+  - os: linux
+    dist: trusty
+    services: docker
+    env: DOCKER=i386/debian:stretch PYTHON=3.5 CPP=14 GCC=6 INSTALL=1
+    name: Python 3.5, c++14, gcc 6, 32-bit
+    script:
+      - |
+        # Consolidated 32-bit Docker Build + Install
+        set -ex
+        $SCRIPT_RUN_PREFIX sh -c "
+          set -ex
+          cmake ${CMAKE_EXTRA_ARGS} -DPYBIND11_INSTALL=1 -DPYBIND11_TEST=0 .
+          make install
+          cp -a tests /pybind11-tests
+          mkdir /build-tests && cd /build-tests
+          cmake ../pybind11-tests ${CMAKE_EXTRA_ARGS} -DPYBIND11_WERROR=ON
+          make pytest -j 2"
+        set +ex
+cache:
+  directories:
+  - $HOME/.local/bin
+  - $HOME/.local/lib
+  - $HOME/.local/include
+  - $HOME/Library/Python
+before_install:
+- |
+  # Configure build variables
+  set -ex
+  if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+    if [ -n "$CLANG" ]; then
+      export CXX=clang++-$CLANG CC=clang-$CLANG
+      EXTRA_PACKAGES+=" clang-$CLANG llvm-$CLANG-dev"
+    else
+      if [ -z "$GCC" ]; then GCC=4.8
+      else EXTRA_PACKAGES+=" g++-$GCC"
+      fi
+      export CXX=g++-$GCC CC=gcc-$GCC
+    fi
+  elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
+    export CXX=clang++ CC=clang;
+  fi
+  if [ -n "$CPP" ]; then CPP=-std=c++$CPP; fi
+  if [ "${PYTHON:0:1}" = "3" ]; then PY=3; fi
+  if [ -n "$DEBUG" ]; then CMAKE_EXTRA_ARGS+=" -DCMAKE_BUILD_TYPE=Debug"; fi
+  set +ex
+- |
+  # Initialize environment
+  set -ex
+  if [ -n "$DOCKER" ]; then
+    docker pull $DOCKER
+
+    containerid=$(docker run --detach --tty \
+      --volume="$PWD":/pybind11 --workdir=/pybind11 \
+      --env="CC=$CC" --env="CXX=$CXX" --env="DEBIAN_FRONTEND=$DEBIAN_FRONTEND" \
+      --env=GCC_COLORS=\  \
+      $DOCKER)
+    SCRIPT_RUN_PREFIX="docker exec --tty $containerid"
+    $SCRIPT_RUN_PREFIX sh -c 'for s in 0 15; do sleep $s; apt-get update && apt-get -qy dist-upgrade && break; done'
+  else
+    if [ "$PYPY" = "5.8" ]; then
+      curl -fSL https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.8.0-linux64.tar.bz2 | tar xj
+      PY_CMD=$(echo `pwd`/pypy2-v5.8.0-linux64/bin/pypy)
+      CMAKE_EXTRA_ARGS+=" -DPYTHON_EXECUTABLE:FILEPATH=$PY_CMD"
+    else
+      PY_CMD=python$PYTHON
+      if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+        if [ "$PY" = "3" ]; then
+          brew update && brew unlink python@2 && brew upgrade python
+        else
+          curl -fsSL https://bootstrap.pypa.io/get-pip.py | $PY_CMD - --user
+        fi
+      fi
+    fi
+    if [ "$PY" = 3 ] || [ -n "$PYPY" ]; then
+      $PY_CMD -m ensurepip --user
+    fi
+    $PY_CMD --version
+    $PY_CMD -m pip install --user --upgrade pip wheel
+  fi
+  set +ex
+install:
+- |
+  # Install dependencies
+  set -ex
+  cmake --version
+  if [ -n "$DOCKER" ]; then
+    if [ -n "$DEBUG" ]; then
+      PY_DEBUG="python$PYTHON-dbg python$PY-scipy-dbg"
+      CMAKE_EXTRA_ARGS+=" -DPYTHON_EXECUTABLE=/usr/bin/python${PYTHON}dm"
+    fi
+    $SCRIPT_RUN_PREFIX sh -c "for s in 0 15; do sleep \$s; \
+      apt-get -qy --no-install-recommends install \
+        $PY_DEBUG python$PYTHON-dev python$PY-pytest python$PY-scipy \
+        libeigen3-dev libboost-dev cmake make ${EXTRA_PACKAGES} && break; done"
+  else
+
+    if [ "$CLANG" = "7" ]; then
+      export CXXFLAGS="-stdlib=libc++"
+    fi
+
+    export NPY_NUM_BUILD_JOBS=2
+    echo "Installing pytest, numpy, scipy..."
+    local PIP_CMD=""
+    if [ -n $PYPY ]; then
+      # For expediency, install only versions that are available on the extra index.
+      travis_wait 30 \
+        $PY_CMD -m pip install --user --upgrade --extra-index-url https://imaginary.ca/trusty-pypi \
+          pytest numpy==1.15.4 scipy==1.2.0
+    else
+      $PY_CMD -m pip install --user --upgrade pytest numpy scipy
+    fi
+    echo "done."
+
+    mkdir eigen
+    curl -fsSL https://bitbucket.org/eigen/eigen/get/3.3.4.tar.bz2 | \
+        tar --extract -j --directory=eigen --strip-components=1
+    export CMAKE_INCLUDE_PATH="${CMAKE_INCLUDE_PATH:+$CMAKE_INCLUDE_PATH:}$PWD/eigen"
+  fi
+  set +ex
+script:
+- |
+  # CMake Configuration
+  set -ex
+  $SCRIPT_RUN_PREFIX cmake ${CMAKE_EXTRA_ARGS} \
+    -DPYBIND11_PYTHON_VERSION=$PYTHON \
+    -DPYBIND11_CPP_STANDARD=$CPP \
+    -DPYBIND11_WERROR=${WERROR:-ON} \
+    -DDOWNLOAD_CATCH=${DOWNLOAD_CATCH:-ON} \
+    .
+  set +ex
+- |
+  # pytest
+  set -ex
+  $SCRIPT_RUN_PREFIX make pytest -j 2 VERBOSE=1
+  set +ex
+- |
+  # cpptest
+  set -ex
+  $SCRIPT_RUN_PREFIX make cpptest -j 2
+  set +ex
+- |
+  # CMake Build Interface
+  set -ex
+  if [ -n "$CMAKE" ]; then $SCRIPT_RUN_PREFIX make test_cmake_build; fi
+  set +ex
+after_failure: cat tests/test_cmake_build/*.log*
+after_script:
+- |
+  # Cleanup (Docker)
+  set -ex
+  if [ -n "$DOCKER" ]; then docker stop "$containerid"; docker rm "$containerid"; fi
+  set +ex
diff --git a/3rdparty/pybind11/CMakeLists.txt b/3rdparty/pybind11/CMakeLists.txt
new file mode 100644
index 00000000..85ecd902
--- /dev/null
+++ b/3rdparty/pybind11/CMakeLists.txt
@@ -0,0 +1,157 @@
+# CMakeLists.txt -- Build system for the pybind11 modules
+#
+# Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
+#
+# All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+cmake_minimum_required(VERSION 2.8.12)
+
+if (POLICY CMP0048)
+  # cmake warns if loaded from a min-3.0-required parent dir, so silence the warning:
+  cmake_policy(SET CMP0048 NEW)
+endif()
+
+# CMake versions < 3.4.0 do not support try_compile/pthread checks without C as active language.
+if(CMAKE_VERSION VERSION_LESS 3.4.0)
+  project(pybind11)
+else()
+  project(pybind11 CXX)
+endif()
+
+# Check if pybind11 is being used directly or via add_subdirectory
+set(PYBIND11_MASTER_PROJECT OFF)
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+  set(PYBIND11_MASTER_PROJECT ON)
+endif()
+
+option(PYBIND11_INSTALL "Install pybind11 header files?" ${PYBIND11_MASTER_PROJECT})
+option(PYBIND11_TEST    "Build pybind11 test suite?"     ${PYBIND11_MASTER_PROJECT})
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/tools")
+
+include(pybind11Tools)
+
+# Cache variables so pybind11_add_module can be used in parent projects
+set(PYBIND11_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}/include" CACHE INTERNAL "")
+set(PYTHON_INCLUDE_DIRS ${PYTHON_INCLUDE_DIRS} CACHE INTERNAL "")
+set(PYTHON_LIBRARIES ${PYTHON_LIBRARIES} CACHE INTERNAL "")
+set(PYTHON_MODULE_PREFIX ${PYTHON_MODULE_PREFIX} CACHE INTERNAL "")
+set(PYTHON_MODULE_EXTENSION ${PYTHON_MODULE_EXTENSION} CACHE INTERNAL "")
+set(PYTHON_VERSION_MAJOR ${PYTHON_VERSION_MAJOR} CACHE INTERNAL "")
+set(PYTHON_VERSION_MINOR ${PYTHON_VERSION_MINOR} CACHE INTERNAL "")
+
+# NB: when adding a header don't forget to also add it to setup.py
+set(PYBIND11_HEADERS
+  include/pybind11/detail/class.h
+  include/pybind11/detail/common.h
+  include/pybind11/detail/descr.h
+  include/pybind11/detail/init.h
+  include/pybind11/detail/internals.h
+  include/pybind11/detail/typeid.h
+  include/pybind11/attr.h
+  include/pybind11/buffer_info.h
+  include/pybind11/cast.h
+  include/pybind11/chrono.h
+  include/pybind11/common.h
+  include/pybind11/complex.h
+  include/pybind11/options.h
+  include/pybind11/eigen.h
+  include/pybind11/embed.h
+  include/pybind11/eval.h
+  include/pybind11/functional.h
+  include/pybind11/numpy.h
+  include/pybind11/operators.h
+  include/pybind11/pybind11.h
+  include/pybind11/pytypes.h
+  include/pybind11/stl.h
+  include/pybind11/stl_bind.h
+)
+string(REPLACE "include/" "${CMAKE_CURRENT_SOURCE_DIR}/include/"
+       PYBIND11_HEADERS "${PYBIND11_HEADERS}")
+
+if (PYBIND11_TEST)
+  add_subdirectory(tests)
+endif()
+
+include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
+
+# extract project version from source
+file(STRINGS "${PYBIND11_INCLUDE_DIR}/pybind11/detail/common.h" pybind11_version_defines
+     REGEX "#define PYBIND11_VERSION_(MAJOR|MINOR|PATCH) ")
+foreach(ver ${pybind11_version_defines})
+  if (ver MATCHES "#define PYBIND11_VERSION_(MAJOR|MINOR|PATCH) +([^ ]+)$")
+    set(PYBIND11_VERSION_${CMAKE_MATCH_1} "${CMAKE_MATCH_2}" CACHE INTERNAL "")
+  endif()
+endforeach()
+set(${PROJECT_NAME}_VERSION ${PYBIND11_VERSION_MAJOR}.${PYBIND11_VERSION_MINOR}.${PYBIND11_VERSION_PATCH})
+message(STATUS "pybind11 v${${PROJECT_NAME}_VERSION}")
+
+option (USE_PYTHON_INCLUDE_DIR "Install pybind11 headers in Python include directory instead of default installation prefix" OFF)
+if (USE_PYTHON_INCLUDE_DIR)
+    file(RELATIVE_PATH CMAKE_INSTALL_INCLUDEDIR ${CMAKE_INSTALL_PREFIX} ${PYTHON_INCLUDE_DIRS})
+endif()
+
+if(NOT (CMAKE_VERSION VERSION_LESS 3.0))  # CMake >= 3.0
+  # Build an interface library target:
+  add_library(pybind11 INTERFACE)
+  add_library(pybind11::pybind11 ALIAS pybind11)  # to match exported target
+  target_include_directories(pybind11 INTERFACE $<BUILD_INTERFACE:${PYBIND11_INCLUDE_DIR}>
+                                                $<BUILD_INTERFACE:${PYTHON_INCLUDE_DIRS}>
+                                                $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+  target_compile_options(pybind11 INTERFACE $<BUILD_INTERFACE:${PYBIND11_CPP_STANDARD}>)
+
+  add_library(module INTERFACE)
+  add_library(pybind11::module ALIAS module)
+  if(NOT MSVC)
+    target_compile_options(module INTERFACE -fvisibility=hidden)
+  endif()
+  target_link_libraries(module INTERFACE pybind11::pybind11)
+  if(WIN32 OR CYGWIN)
+    target_link_libraries(module INTERFACE $<BUILD_INTERFACE:${PYTHON_LIBRARIES}>)
+  elseif(APPLE)
+    target_link_libraries(module INTERFACE "-undefined dynamic_lookup")
+  endif()
+
+  add_library(embed INTERFACE)
+  add_library(pybind11::embed ALIAS embed)
+  target_link_libraries(embed INTERFACE pybind11::pybind11 $<BUILD_INTERFACE:${PYTHON_LIBRARIES}>)
+endif()
+
+if (PYBIND11_INSTALL)
+  install(DIRECTORY ${PYBIND11_INCLUDE_DIR}/pybind11 DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+  # GNUInstallDirs "DATADIR" wrong here; CMake search path wants "share".
+  set(PYBIND11_CMAKECONFIG_INSTALL_DIR "share/cmake/${PROJECT_NAME}" CACHE STRING "install path for pybind11Config.cmake")
+
+  configure_package_config_file(tools/${PROJECT_NAME}Config.cmake.in
+                                "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
+                                INSTALL_DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
+  # Remove CMAKE_SIZEOF_VOID_P from ConfigVersion.cmake since the library does
+  # not depend on architecture specific settings or libraries.
+  set(_PYBIND11_CMAKE_SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P})
+  unset(CMAKE_SIZEOF_VOID_P)
+  write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+                                   VERSION ${${PROJECT_NAME}_VERSION}
+                                   COMPATIBILITY AnyNewerVersion)
+  set(CMAKE_SIZEOF_VOID_P ${_PYBIND11_CMAKE_SIZEOF_VOID_P})
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+                ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+                tools/FindPythonLibsNew.cmake
+                tools/pybind11Tools.cmake
+          DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
+
+  if(NOT (CMAKE_VERSION VERSION_LESS 3.0))
+    if(NOT PYBIND11_EXPORT_NAME)
+      set(PYBIND11_EXPORT_NAME "${PROJECT_NAME}Targets")
+    endif()
+
+    install(TARGETS pybind11 module embed
+            EXPORT "${PYBIND11_EXPORT_NAME}")
+    if(PYBIND11_MASTER_PROJECT)
+      install(EXPORT "${PYBIND11_EXPORT_NAME}"
+              NAMESPACE "${PROJECT_NAME}::"
+              DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
+    endif()
+  endif()
+endif()
diff --git a/3rdparty/pybind11/CONTRIBUTING.md b/3rdparty/pybind11/CONTRIBUTING.md
new file mode 100644
index 00000000..01596d94
--- /dev/null
+++ b/3rdparty/pybind11/CONTRIBUTING.md
@@ -0,0 +1,49 @@
+Thank you for your interest in this project! Please refer to the following
+sections on how to contribute code and bug reports.
+
+### Reporting bugs
+
+At the moment, this project is run in the spare time of a single person
+([Wenzel Jakob](http://rgl.epfl.ch/people/wjakob)) with very limited resources
+for issue tracker tickets. Thus, before submitting a question or bug report,
+please take a moment of your time and ensure that your issue isn't already
+discussed in the project documentation provided at
+[http://pybind11.readthedocs.org/en/latest](http://pybind11.readthedocs.org/en/latest).
+
+Assuming that you have identified a previously unknown problem or an important
+question, it's essential that you submit a self-contained and minimal piece of
+code that reproduces the problem. In other words: no external dependencies,
+isolate the function(s) that cause breakage, submit matched and complete C++
+and Python snippets that can be easily compiled and run on my end.
+
+## Pull requests
+Contributions are submitted, reviewed, and accepted using Github pull requests.
+Please refer to [this
+article](https://help.github.com/articles/using-pull-requests) for details and
+adhere to the following rules to make the process as smooth as possible:
+
+* Make a new branch for every feature you're working on.
+* Make small and clean pull requests that are easy to review but make sure they
+  do add value by themselves.
+* Add tests for any new functionality and run the test suite (``make pytest``)
+  to ensure that no existing features break.
+* Please run ``flake8`` and ``tools/check-style.sh`` to check your code matches
+  the project style. (Note that ``check-style.sh`` requires ``gawk``.)
+* This project has a strong focus on providing general solutions using a
+  minimal amount of code, thus small pull requests are greatly preferred.
+
+### Licensing of contributions
+
+pybind11 is provided under a BSD-style license that can be found in the
+``LICENSE`` file. By using, distributing, or contributing to this project, you
+agree to the terms and conditions of this license.
+
+You are under no obligation whatsoever to provide any bug fixes, patches, or
+upgrades to the features, functionality or performance of the source code
+("Enhancements") to anyone; however, if you choose to make your Enhancements
+available either publicly, or directly to the author of this software, without
+imposing a separate written license agreement for such Enhancements, then you
+hereby grant the following license: a non-exclusive, royalty-free perpetual
+license to install, use, modify, prepare derivative works, incorporate into
+other computer software, distribute, and sublicense such enhancements or
+derivative works thereof, in binary and source code form.
diff --git a/3rdparty/pybind11/ISSUE_TEMPLATE.md b/3rdparty/pybind11/ISSUE_TEMPLATE.md
new file mode 100644
index 00000000..75df3998
--- /dev/null
+++ b/3rdparty/pybind11/ISSUE_TEMPLATE.md
@@ -0,0 +1,17 @@
+Make sure you've completed the following steps before submitting your issue -- thank you!
+
+1. Check if your question has already been answered in the [FAQ](http://pybind11.readthedocs.io/en/latest/faq.html) section.
+2. Make sure you've read the [documentation](http://pybind11.readthedocs.io/en/latest/). Your issue may be addressed there.
+3. If those resources didn't help and you only have a short question (not a bug report), consider asking in the [Gitter chat room](https://gitter.im/pybind/Lobby).
+4. If you have a genuine bug report or a more complex question which is not answered in the previous items (or not suitable for chat), please fill in the details below.
+5. Include a self-contained and minimal piece of code that reproduces the problem. If that's not possible, try to make the description as clear as possible.
+
+*After reading, remove this checklist and the template text in parentheses below.*
+
+## Issue description
+
+(Provide a short description, state the expected behavior and what actually happens.)
+
+## Reproducible example code
+
+(The code should be minimal, have no external dependencies, isolate the function(s) that cause breakage. Submit matched and complete C++ and Python snippets that can be easily compiled and run to diagnose the issue.)
diff --git a/3rdparty/pybind11/LICENSE b/3rdparty/pybind11/LICENSE
new file mode 100644
index 00000000..6f15578c
--- /dev/null
+++ b/3rdparty/pybind11/LICENSE
@@ -0,0 +1,29 @@
+Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>, All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Please also refer to the file CONTRIBUTING.md, which clarifies licensing of
+external contributions to this project including patches, pull requests, etc.
diff --git a/3rdparty/pybind11/MANIFEST.in b/3rdparty/pybind11/MANIFEST.in
new file mode 100644
index 00000000..6e57baee
--- /dev/null
+++ b/3rdparty/pybind11/MANIFEST.in
@@ -0,0 +1,2 @@
+recursive-include include/pybind11 *.h
+include LICENSE README.md CONTRIBUTING.md
diff --git a/3rdparty/pybind11/README.md b/3rdparty/pybind11/README.md
new file mode 100644
index 00000000..35d2d76f
--- /dev/null
+++ b/3rdparty/pybind11/README.md
@@ -0,0 +1,129 @@
+![pybind11 logo](https://github.com/pybind/pybind11/raw/master/docs/pybind11-logo.png)
+
+# pybind11 — Seamless operability between C++11 and Python
+
+[![Documentation Status](https://readthedocs.org/projects/pybind11/badge/?version=master)](http://pybind11.readthedocs.org/en/master/?badge=master)
+[![Documentation Status](https://readthedocs.org/projects/pybind11/badge/?version=stable)](http://pybind11.readthedocs.org/en/stable/?badge=stable)
+[![Gitter chat](https://img.shields.io/gitter/room/gitterHQ/gitter.svg)](https://gitter.im/pybind/Lobby)
+[![Build Status](https://travis-ci.org/pybind/pybind11.svg?branch=master)](https://travis-ci.org/pybind/pybind11)
+[![Build status](https://ci.appveyor.com/api/projects/status/riaj54pn4h08xy40?svg=true)](https://ci.appveyor.com/project/wjakob/pybind11)
+
+**pybind11** is a lightweight header-only library that exposes C++ types in Python
+and vice versa, mainly to create Python bindings of existing C++ code. Its
+goals and syntax are similar to the excellent
+[Boost.Python](http://www.boost.org/doc/libs/1_58_0/libs/python/doc/) library
+by David Abrahams: to minimize boilerplate code in traditional extension
+modules by inferring type information using compile-time introspection.
+
+The main issue with Boost.Python—and the reason for creating such a similar
+project—is Boost. Boost is an enormously large and complex suite of utility
+libraries that works with almost every C++ compiler in existence. This
+compatibility has its cost: arcane template tricks and workarounds are
+necessary to support the oldest and buggiest of compiler specimens. Now that
+C++11-compatible compilers are widely available, this heavy machinery has
+become an excessively large and unnecessary dependency.
+
+Think of this library as a tiny self-contained version of Boost.Python with
+everything stripped away that isn't relevant for binding generation. Without
+comments, the core header files only require ~4K lines of code and depend on
+Python (2.7 or 3.x, or PyPy2.7 >= 5.7) and the C++ standard library. This
+compact implementation was possible thanks to some of the new C++11 language
+features (specifically: tuples, lambda functions and variadic templates). Since
+its creation, this library has grown beyond Boost.Python in many ways, leading
+to dramatically simpler binding code in many common situations.
+
+Tutorial and reference documentation is provided at
+[http://pybind11.readthedocs.org/en/master](http://pybind11.readthedocs.org/en/master).
+A PDF version of the manual is available
+[here](https://media.readthedocs.org/pdf/pybind11/master/pybind11.pdf).
+
+## Core features
+pybind11 can map the following core C++ features to Python
+
+- Functions accepting and returning custom data structures per value, reference, or pointer
+- Instance methods and static methods
+- Overloaded functions
+- Instance attributes and static attributes
+- Arbitrary exception types
+- Enumerations
+- Callbacks
+- Iterators and ranges
+- Custom operators
+- Single and multiple inheritance
+- STL data structures
+- Smart pointers with reference counting like ``std::shared_ptr``
+- Internal references with correct reference counting
+- C++ classes with virtual (and pure virtual) methods can be extended in Python
+
+## Goodies
+In addition to the core functionality, pybind11 provides some extra goodies:
+
+- Python 2.7, 3.x, and PyPy (PyPy2.7 >= 5.7) are supported with an
+  implementation-agnostic interface.
+
+- It is possible to bind C++11 lambda functions with captured variables. The
+  lambda capture data is stored inside the resulting Python function object.
+
+- pybind11 uses C++11 move constructors and move assignment operators whenever
+  possible to efficiently transfer custom data types.
+
+- It's easy to expose the internal storage of custom data types through
+  Pythons' buffer protocols. This is handy e.g. for fast conversion between
+  C++ matrix classes like Eigen and NumPy without expensive copy operations.
+
+- pybind11 can automatically vectorize functions so that they are transparently
+  applied to all entries of one or more NumPy array arguments.
+
+- Python's slice-based access and assignment operations can be supported with
+  just a few lines of code.
+
+- Everything is contained in just a few header files; there is no need to link
+  against any additional libraries.
+
+- Binaries are generally smaller by a factor of at least 2 compared to
+  equivalent bindings generated by Boost.Python. A recent pybind11 conversion
+  of PyRosetta, an enormous Boost.Python binding project,
+  [reported](http://graylab.jhu.edu/RosettaCon2016/PyRosetta-4.pdf) a binary
+  size reduction of **5.4x** and compile time reduction by **5.8x**.
+
+- Function signatures are precomputed at compile time (using ``constexpr``),
+  leading to smaller binaries.
+
+- With little extra effort, C++ types can be pickled and unpickled similar to
+  regular Python objects.
+
+## Supported compilers
+
+1. Clang/LLVM 3.3 or newer (for Apple Xcode's clang, this is 5.0.0 or newer)
+2. GCC 4.8 or newer
+3. Microsoft Visual Studio 2015 Update 3 or newer
+4. Intel C++ compiler 17 or newer (16 with pybind11 v2.0 and 15 with pybind11 v2.0 and a [workaround](https://github.com/pybind/pybind11/issues/276))
+5. Cygwin/GCC (tested on 2.5.1)
+
+## About
+
+This project was created by [Wenzel Jakob](http://rgl.epfl.ch/people/wjakob).
+Significant features and/or improvements to the code were contributed by
+Jonas Adler,
+Lori A. Burns,
+Sylvain Corlay,
+Trent Houliston,
+Axel Huebl,
+@hulucc,
+Sergey Lyskov
+Johan Mabille,
+Tomasz Miąsko,
+Dean Moldovan,
+Ben Pritchard,
+Jason Rhinelander,
+Boris Schäling,
+Pim Schellart,
+Henry Schreiner,
+Ivan Smirnov, and
+Patrick Stewart.
+
+### License
+
+pybind11 is provided under a BSD-style license that can be found in the
+``LICENSE`` file. By using, distributing, or contributing to this project,
+you agree to the terms and conditions of this license.
diff --git a/3rdparty/pybind11/docs/Doxyfile b/3rdparty/pybind11/docs/Doxyfile
new file mode 100644
index 00000000..1b9d1297
--- /dev/null
+++ b/3rdparty/pybind11/docs/Doxyfile
@@ -0,0 +1,20 @@
+PROJECT_NAME           = pybind11
+INPUT                  = ../include/pybind11/
+RECURSIVE              = YES
+
+GENERATE_HTML          = NO
+GENERATE_LATEX         = NO
+GENERATE_XML           = YES
+XML_OUTPUT             = .build/doxygenxml
+XML_PROGRAMLISTING     = YES
+
+MACRO_EXPANSION        = YES
+EXPAND_ONLY_PREDEF     = YES
+EXPAND_AS_DEFINED      = PYBIND11_RUNTIME_EXCEPTION
+
+ALIASES                = "rst=\verbatim embed:rst"
+ALIASES               += "endrst=\endverbatim"
+
+QUIET                  = YES
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = NO
diff --git a/3rdparty/pybind11/docs/_static/theme_overrides.css b/3rdparty/pybind11/docs/_static/theme_overrides.css
new file mode 100644
index 00000000..1071809f
--- /dev/null
+++ b/3rdparty/pybind11/docs/_static/theme_overrides.css
@@ -0,0 +1,11 @@
+.wy-table-responsive table td,
+.wy-table-responsive table th {
+    white-space: initial !important;
+}
+.rst-content table.docutils td {
+    vertical-align: top !important;
+}
+div[class^='highlight'] pre {
+    white-space: pre;
+    white-space: pre-wrap;
+}
diff --git a/3rdparty/pybind11/docs/advanced/cast/chrono.rst b/3rdparty/pybind11/docs/advanced/cast/chrono.rst
new file mode 100644
index 00000000..fbd46057
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/chrono.rst
@@ -0,0 +1,81 @@
+Chrono
+======
+
+When including the additional header file :file:`pybind11/chrono.h` conversions
+from C++11 chrono datatypes to python datetime objects are automatically enabled.
+This header also enables conversions of python floats (often from sources such
+as ``time.monotonic()``, ``time.perf_counter()`` and ``time.process_time()``)
+into durations.
+
+An overview of clocks in C++11
+------------------------------
+
+A point of confusion when using these conversions is the differences between
+clocks provided in C++11. There are three clock types defined by the C++11
+standard and users can define their own if needed. Each of these clocks have
+different properties and when converting to and from python will give different
+results.
+
+The first clock defined by the standard is ``std::chrono::system_clock``. This
+clock measures the current date and time. However, this clock changes with to
+updates to the operating system time. For example, if your time is synchronised
+with a time server this clock will change. This makes this clock a poor choice
+for timing purposes but good for measuring the wall time.
+
+The second clock defined in the standard is ``std::chrono::steady_clock``.
+This clock ticks at a steady rate and is never adjusted. This makes it excellent
+for timing purposes, however the value in this clock does not correspond to the
+current date and time. Often this clock will be the amount of time your system
+has been on, although it does not have to be. This clock will never be the same
+clock as the system clock as the system clock can change but steady clocks
+cannot.
+
+The third clock defined in the standard is ``std::chrono::high_resolution_clock``.
+This clock is the clock that has the highest resolution out of the clocks in the
+system. It is normally a typedef to either the system clock or the steady clock
+but can be its own independent clock. This is important as when using these
+conversions as the types you get in python for this clock might be different
+depending on the system.
+If it is a typedef of the system clock, python will get datetime objects, but if
+it is a different clock they will be timedelta objects.
+
+Provided conversions
+--------------------
+
+.. rubric:: C++ to Python
+
+- ``std::chrono::system_clock::time_point`` → ``datetime.datetime``
+    System clock times are converted to python datetime instances. They are
+    in the local timezone, but do not have any timezone information attached
+    to them (they are naive datetime objects).
+
+- ``std::chrono::duration`` → ``datetime.timedelta``
+    Durations are converted to timedeltas, any precision in the duration
+    greater than microseconds is lost by rounding towards zero.
+
+- ``std::chrono::[other_clocks]::time_point`` → ``datetime.timedelta``
+    Any clock time that is not the system clock is converted to a time delta.
+    This timedelta measures the time from the clocks epoch to now.
+
+.. rubric:: Python to C++
+
+- ``datetime.datetime`` or ``datetime.date`` or ``datetime.time`` → ``std::chrono::system_clock::time_point``
+    Date/time objects are converted into system clock timepoints. Any
+    timezone information is ignored and the type is treated as a naive
+    object.
+
+- ``datetime.timedelta`` → ``std::chrono::duration``
+    Time delta are converted into durations with microsecond precision.
+
+- ``datetime.timedelta`` → ``std::chrono::[other_clocks]::time_point``
+    Time deltas that are converted into clock timepoints are treated as
+    the amount of time from the start of the clocks epoch.
+
+- ``float`` → ``std::chrono::duration``
+    Floats that are passed to C++ as durations be interpreted as a number of
+    seconds. These will be converted to the duration using ``duration_cast``
+    from the float.
+
+- ``float`` → ``std::chrono::[other_clocks]::time_point``
+    Floats that are passed to C++ as time points will be interpreted as the
+    number of seconds from the start of the clocks epoch.
diff --git a/3rdparty/pybind11/docs/advanced/cast/custom.rst b/3rdparty/pybind11/docs/advanced/cast/custom.rst
new file mode 100644
index 00000000..e4f99ac5
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/custom.rst
@@ -0,0 +1,91 @@
+Custom type casters
+===================
+
+In very rare cases, applications may require custom type casters that cannot be
+expressed using the abstractions provided by pybind11, thus requiring raw
+Python C API calls. This is fairly advanced usage and should only be pursued by
+experts who are familiar with the intricacies of Python reference counting.
+
+The following snippets demonstrate how this works for a very simple ``inty``
+type that that should be convertible from Python types that provide a
+``__int__(self)`` method.
+
+.. code-block:: cpp
+
+    struct inty { long long_value; };
+
+    void print(inty s) {
+        std::cout << s.long_value << std::endl;
+    }
+
+The following Python snippet demonstrates the intended usage from the Python side:
+
+.. code-block:: python
+
+    class A:
+        def __int__(self):
+            return 123
+
+    from example import print
+    print(A())
+
+To register the necessary conversion routines, it is necessary to add
+a partial overload to the ``pybind11::detail::type_caster<T>`` template.
+Although this is an implementation detail, adding partial overloads to this
+type is explicitly allowed.
+
+.. code-block:: cpp
+
+    namespace pybind11 { namespace detail {
+        template <> struct type_caster<inty> {
+        public:
+            /**
+             * This macro establishes the name 'inty' in
+             * function signatures and declares a local variable
+             * 'value' of type inty
+             */
+            PYBIND11_TYPE_CASTER(inty, _("inty"));
+
+            /**
+             * Conversion part 1 (Python->C++): convert a PyObject into a inty
+             * instance or return false upon failure. The second argument
+             * indicates whether implicit conversions should be applied.
+             */
+            bool load(handle src, bool) {
+                /* Extract PyObject from handle */
+                PyObject *source = src.ptr();
+                /* Try converting into a Python integer value */
+                PyObject *tmp = PyNumber_Long(source);
+                if (!tmp)
+                    return false;
+                /* Now try to convert into a C++ int */
+                value.long_value = PyLong_AsLong(tmp);
+                Py_DECREF(tmp);
+                /* Ensure return code was OK (to avoid out-of-range errors etc) */
+                return !(value.long_value == -1 && !PyErr_Occurred());
+            }
+
+            /**
+             * Conversion part 2 (C++ -> Python): convert an inty instance into
+             * a Python object. The second and third arguments are used to
+             * indicate the return value policy and parent object (for
+             * ``return_value_policy::reference_internal``) and are generally
+             * ignored by implicit casters.
+             */
+            static handle cast(inty src, return_value_policy /* policy */, handle /* parent */) {
+                return PyLong_FromLong(src.long_value);
+            }
+        };
+    }} // namespace pybind11::detail
+
+.. note::
+
+    A ``type_caster<T>`` defined with ``PYBIND11_TYPE_CASTER(T, ...)`` requires
+    that ``T`` is default-constructible (``value`` is first default constructed
+    and then ``load()`` assigns to it).
+
+.. warning::
+
+    When using custom type casters, it's important to declare them consistently
+    in every compilation unit of the Python extension module. Otherwise,
+    undefined behavior can ensue.
diff --git a/3rdparty/pybind11/docs/advanced/cast/eigen.rst b/3rdparty/pybind11/docs/advanced/cast/eigen.rst
new file mode 100644
index 00000000..59ba08c3
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/eigen.rst
@@ -0,0 +1,310 @@
+Eigen
+#####
+
+`Eigen <http://eigen.tuxfamily.org>`_ is C++ header-based library for dense and
+sparse linear algebra. Due to its popularity and widespread adoption, pybind11
+provides transparent conversion and limited mapping support between Eigen and
+Scientific Python linear algebra data types.
+
+To enable the built-in Eigen support you must include the optional header file
+:file:`pybind11/eigen.h`.
+
+Pass-by-value
+=============
+
+When binding a function with ordinary Eigen dense object arguments (for
+example, ``Eigen::MatrixXd``), pybind11 will accept any input value that is
+already (or convertible to) a ``numpy.ndarray`` with dimensions compatible with
+the Eigen type, copy its values into a temporary Eigen variable of the
+appropriate type, then call the function with this temporary variable.
+
+Sparse matrices are similarly copied to or from
+``scipy.sparse.csr_matrix``/``scipy.sparse.csc_matrix`` objects.
+
+Pass-by-reference
+=================
+
+One major limitation of the above is that every data conversion implicitly
+involves a copy, which can be both expensive (for large matrices) and disallows
+binding functions that change their (Matrix) arguments.  Pybind11 allows you to
+work around this by using Eigen's ``Eigen::Ref<MatrixType>`` class much as you
+would when writing a function taking a generic type in Eigen itself (subject to
+some limitations discussed below).
+
+When calling a bound function accepting a ``Eigen::Ref<const MatrixType>``
+type, pybind11 will attempt to avoid copying by using an ``Eigen::Map`` object
+that maps into the source ``numpy.ndarray`` data: this requires both that the
+data types are the same (e.g. ``dtype='float64'`` and ``MatrixType::Scalar`` is
+``double``); and that the storage is layout compatible.  The latter limitation
+is discussed in detail in the section below, and requires careful
+consideration: by default, numpy matrices and Eigen matrices are *not* storage
+compatible.
+
+If the numpy matrix cannot be used as is (either because its types differ, e.g.
+passing an array of integers to an Eigen parameter requiring doubles, or
+because the storage is incompatible), pybind11 makes a temporary copy and
+passes the copy instead.
+
+When a bound function parameter is instead ``Eigen::Ref<MatrixType>`` (note the
+lack of ``const``), pybind11 will only allow the function to be called if it
+can be mapped *and* if the numpy array is writeable (that is
+``a.flags.writeable`` is true).  Any access (including modification) made to
+the passed variable will be transparently carried out directly on the
+``numpy.ndarray``.
+
+This means you can can write code such as the following and have it work as
+expected:
+
+.. code-block:: cpp
+
+    void scale_by_2(Eigen::Ref<Eigen::VectorXd> v) {
+        v *= 2;
+    }
+
+Note, however, that you will likely run into limitations due to numpy and
+Eigen's difference default storage order for data; see the below section on
+:ref:`storage_orders` for details on how to bind code that won't run into such
+limitations.
+
+.. note::
+
+    Passing by reference is not supported for sparse types.
+
+Returning values to Python
+==========================
+
+When returning an ordinary dense Eigen matrix type to numpy (e.g.
+``Eigen::MatrixXd`` or ``Eigen::RowVectorXf``) pybind11 keeps the matrix and
+returns a numpy array that directly references the Eigen matrix: no copy of the
+data is performed.  The numpy array will have ``array.flags.owndata`` set to
+``False`` to indicate that it does not own the data, and the lifetime of the
+stored Eigen matrix will be tied to the returned ``array``.
+
+If you bind a function with a non-reference, ``const`` return type (e.g.
+``const Eigen::MatrixXd``), the same thing happens except that pybind11 also
+sets the numpy array's ``writeable`` flag to false.
+
+If you return an lvalue reference or pointer, the usual pybind11 rules apply,
+as dictated by the binding function's return value policy (see the
+documentation on :ref:`return_value_policies` for full details).  That means,
+without an explicit return value policy, lvalue references will be copied and
+pointers will be managed by pybind11.  In order to avoid copying, you should
+explicitly specify an appropriate return value policy, as in the following
+example:
+
+.. code-block:: cpp
+
+    class MyClass {
+        Eigen::MatrixXd big_mat = Eigen::MatrixXd::Zero(10000, 10000);
+    public:
+        Eigen::MatrixXd &getMatrix() { return big_mat; }
+        const Eigen::MatrixXd &viewMatrix() { return big_mat; }
+    };
+
+    // Later, in binding code:
+    py::class_<MyClass>(m, "MyClass")
+        .def(py::init<>())
+        .def("copy_matrix", &MyClass::getMatrix) // Makes a copy!
+        .def("get_matrix", &MyClass::getMatrix, py::return_value_policy::reference_internal)
+        .def("view_matrix", &MyClass::viewMatrix, py::return_value_policy::reference_internal)
+        ;
+
+.. code-block:: python
+
+    a = MyClass()
+    m = a.get_matrix()   # flags.writeable = True,  flags.owndata = False
+    v = a.view_matrix()  # flags.writeable = False, flags.owndata = False
+    c = a.copy_matrix()  # flags.writeable = True,  flags.owndata = True
+    # m[5,6] and v[5,6] refer to the same element, c[5,6] does not.
+
+Note in this example that ``py::return_value_policy::reference_internal`` is
+used to tie the life of the MyClass object to the life of the returned arrays.
+
+You may also return an ``Eigen::Ref``, ``Eigen::Map`` or other map-like Eigen
+object (for example, the return value of ``matrix.block()`` and related
+methods) that map into a dense Eigen type.  When doing so, the default
+behaviour of pybind11 is to simply reference the returned data: you must take
+care to ensure that this data remains valid!  You may ask pybind11 to
+explicitly *copy* such a return value by using the
+``py::return_value_policy::copy`` policy when binding the function.  You may
+also use ``py::return_value_policy::reference_internal`` or a
+``py::keep_alive`` to ensure the data stays valid as long as the returned numpy
+array does.
+
+When returning such a reference of map, pybind11 additionally respects the
+readonly-status of the returned value, marking the numpy array as non-writeable
+if the reference or map was itself read-only.
+
+.. note::
+
+    Sparse types are always copied when returned.
+
+.. _storage_orders:
+
+Storage orders
+==============
+
+Passing arguments via ``Eigen::Ref`` has some limitations that you must be
+aware of in order to effectively pass matrices by reference.  First and
+foremost is that the default ``Eigen::Ref<MatrixType>`` class requires
+contiguous storage along columns (for column-major types, the default in Eigen)
+or rows if ``MatrixType`` is specifically an ``Eigen::RowMajor`` storage type.
+The former, Eigen's default, is incompatible with ``numpy``'s default row-major
+storage, and so you will not be able to pass numpy arrays to Eigen by reference
+without making one of two changes.
+
+(Note that this does not apply to vectors (or column or row matrices): for such
+types the "row-major" and "column-major" distinction is meaningless).
+
+The first approach is to change the use of ``Eigen::Ref<MatrixType>`` to the
+more general ``Eigen::Ref<MatrixType, 0, Eigen::Stride<Eigen::Dynamic,
+Eigen::Dynamic>>`` (or similar type with a fully dynamic stride type in the
+third template argument).  Since this is a rather cumbersome type, pybind11
+provides a ``py::EigenDRef<MatrixType>`` type alias for your convenience (along
+with EigenDMap for the equivalent Map, and EigenDStride for just the stride
+type).
+
+This type allows Eigen to map into any arbitrary storage order.  This is not
+the default in Eigen for performance reasons: contiguous storage allows
+vectorization that cannot be done when storage is not known to be contiguous at
+compile time.  The default ``Eigen::Ref`` stride type allows non-contiguous
+storage along the outer dimension (that is, the rows of a column-major matrix
+or columns of a row-major matrix), but not along the inner dimension.
+
+This type, however, has the added benefit of also being able to map numpy array
+slices.  For example, the following (contrived) example uses Eigen with a numpy
+slice to multiply by 2 all coefficients that are both on even rows (0, 2, 4,
+...) and in columns 2, 5, or 8:
+
+.. code-block:: cpp
+
+    m.def("scale", [](py::EigenDRef<Eigen::MatrixXd> m, double c) { m *= c; });
+
+.. code-block:: python
+
+    # a = np.array(...)
+    scale_by_2(myarray[0::2, 2:9:3])
+
+The second approach to avoid copying is more intrusive: rearranging the
+underlying data types to not run into the non-contiguous storage problem in the
+first place.  In particular, that means using matrices with ``Eigen::RowMajor``
+storage, where appropriate, such as:
+
+.. code-block:: cpp
+
+    using RowMatrixXd = Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>;
+    // Use RowMatrixXd instead of MatrixXd
+
+Now bound functions accepting ``Eigen::Ref<RowMatrixXd>`` arguments will be
+callable with numpy's (default) arrays without involving a copying.
+
+You can, alternatively, change the storage order that numpy arrays use by
+adding the ``order='F'`` option when creating an array:
+
+.. code-block:: python
+
+    myarray = np.array(source, order='F')
+
+Such an object will be passable to a bound function accepting an
+``Eigen::Ref<MatrixXd>`` (or similar column-major Eigen type).
+
+One major caveat with this approach, however, is that it is not entirely as
+easy as simply flipping all Eigen or numpy usage from one to the other: some
+operations may alter the storage order of a numpy array.  For example, ``a2 =
+array.transpose()`` results in ``a2`` being a view of ``array`` that references
+the same data, but in the opposite storage order!
+
+While this approach allows fully optimized vectorized calculations in Eigen, it
+cannot be used with array slices, unlike the first approach.
+
+When *returning* a matrix to Python (either a regular matrix, a reference via
+``Eigen::Ref<>``, or a map/block into a matrix), no special storage
+consideration is required: the created numpy array will have the required
+stride that allows numpy to properly interpret the array, whatever its storage
+order.
+
+Failing rather than copying
+===========================
+
+The default behaviour when binding ``Eigen::Ref<const MatrixType>`` Eigen
+references is to copy matrix values when passed a numpy array that does not
+conform to the element type of ``MatrixType`` or does not have a compatible
+stride layout.  If you want to explicitly avoid copying in such a case, you
+should bind arguments using the ``py::arg().noconvert()`` annotation (as
+described in the :ref:`nonconverting_arguments` documentation).
+
+The following example shows an example of arguments that don't allow data
+copying to take place:
+
+.. code-block:: cpp
+
+    // The method and function to be bound:
+    class MyClass {
+        // ...
+        double some_method(const Eigen::Ref<const MatrixXd> &matrix) { /* ... */ }
+    };
+    float some_function(const Eigen::Ref<const MatrixXf> &big,
+                        const Eigen::Ref<const MatrixXf> &small) {
+        // ...
+    }
+
+    // The associated binding code:
+    using namespace pybind11::literals; // for "arg"_a
+    py::class_<MyClass>(m, "MyClass")
+        // ... other class definitions
+        .def("some_method", &MyClass::some_method, py::arg().noconvert());
+
+    m.def("some_function", &some_function,
+        "big"_a.noconvert(), // <- Don't allow copying for this arg
+        "small"_a            // <- This one can be copied if needed
+    );
+
+With the above binding code, attempting to call the the ``some_method(m)``
+method on a ``MyClass`` object, or attempting to call ``some_function(m, m2)``
+will raise a ``RuntimeError`` rather than making a temporary copy of the array.
+It will, however, allow the ``m2`` argument to be copied into a temporary if
+necessary.
+
+Note that explicitly specifying ``.noconvert()`` is not required for *mutable*
+Eigen references (e.g. ``Eigen::Ref<MatrixXd>`` without ``const`` on the
+``MatrixXd``): mutable references will never be called with a temporary copy.
+
+Vectors versus column/row matrices
+==================================
+
+Eigen and numpy have fundamentally different notions of a vector.  In Eigen, a
+vector is simply a matrix with the number of columns or rows set to 1 at
+compile time (for a column vector or row vector, respectively).  Numpy, in
+contrast, has comparable 2-dimensional 1xN and Nx1 arrays, but *also* has
+1-dimensional arrays of size N.
+
+When passing a 2-dimensional 1xN or Nx1 array to Eigen, the Eigen type must
+have matching dimensions: That is, you cannot pass a 2-dimensional Nx1 numpy
+array to an Eigen value expecting a row vector, or a 1xN numpy array as a
+column vector argument.
+
+On the other hand, pybind11 allows you to pass 1-dimensional arrays of length N
+as Eigen parameters.  If the Eigen type can hold a column vector of length N it
+will be passed as such a column vector.  If not, but the Eigen type constraints
+will accept a row vector, it will be passed as a row vector.  (The column
+vector takes precedence when both are supported, for example, when passing a
+1D numpy array to a MatrixXd argument).  Note that the type need not be
+explicitly a vector: it is permitted to pass a 1D numpy array of size 5 to an
+Eigen ``Matrix<double, Dynamic, 5>``: you would end up with a 1x5 Eigen matrix.
+Passing the same to an ``Eigen::MatrixXd`` would result in a 5x1 Eigen matrix.
+
+When returning an Eigen vector to numpy, the conversion is ambiguous: a row
+vector of length 4 could be returned as either a 1D array of length 4, or as a
+2D array of size 1x4.  When encountering such a situation, pybind11 compromises
+by considering the returned Eigen type: if it is a compile-time vector--that
+is, the type has either the number of rows or columns set to 1 at compile
+time--pybind11 converts to a 1D numpy array when returning the value.  For
+instances that are a vector only at run-time (e.g. ``MatrixXd``,
+``Matrix<float, Dynamic, 4>``), pybind11 returns the vector as a 2D array to
+numpy.  If this isn't want you want, you can use ``array.reshape(...)`` to get
+a view of the same data in the desired dimensions.
+
+.. seealso::
+
+    The file :file:`tests/test_eigen.cpp` contains a complete example that
+    shows how to pass Eigen sparse and dense data types in more detail.
diff --git a/3rdparty/pybind11/docs/advanced/cast/functional.rst b/3rdparty/pybind11/docs/advanced/cast/functional.rst
new file mode 100644
index 00000000..d9b46057
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/functional.rst
@@ -0,0 +1,109 @@
+Functional
+##########
+
+The following features must be enabled by including :file:`pybind11/functional.h`.
+
+
+Callbacks and passing anonymous functions
+=========================================
+
+The C++11 standard brought lambda functions and the generic polymorphic
+function wrapper ``std::function<>`` to the C++ programming language, which
+enable powerful new ways of working with functions. Lambda functions come in
+two flavors: stateless lambda function resemble classic function pointers that
+link to an anonymous piece of code, while stateful lambda functions
+additionally depend on captured variables that are stored in an anonymous
+*lambda closure object*.
+
+Here is a simple example of a C++ function that takes an arbitrary function
+(stateful or stateless) with signature ``int -> int`` as an argument and runs
+it with the value 10.
+
+.. code-block:: cpp
+
+    int func_arg(const std::function<int(int)> &f) {
+        return f(10);
+    }
+
+The example below is more involved: it takes a function of signature ``int -> int``
+and returns another function of the same kind. The return value is a stateful
+lambda function, which stores the value ``f`` in the capture object and adds 1 to
+its return value upon execution.
+
+.. code-block:: cpp
+
+    std::function<int(int)> func_ret(const std::function<int(int)> &f) {
+        return [f](int i) {
+            return f(i) + 1;
+        };
+    }
+
+This example demonstrates using python named parameters in C++ callbacks which
+requires using ``py::cpp_function`` as a wrapper. Usage is similar to defining
+methods of classes:
+
+.. code-block:: cpp
+
+    py::cpp_function func_cpp() {
+        return py::cpp_function([](int i) { return i+1; },
+           py::arg("number"));
+    }
+
+After including the extra header file :file:`pybind11/functional.h`, it is almost
+trivial to generate binding code for all of these functions.
+
+.. code-block:: cpp
+
+    #include <pybind11/functional.h>
+
+    PYBIND11_MODULE(example, m) {
+        m.def("func_arg", &func_arg);
+        m.def("func_ret", &func_ret);
+        m.def("func_cpp", &func_cpp);
+    }
+
+The following interactive session shows how to call them from Python.
+
+.. code-block:: pycon
+
+    $ python
+    >>> import example
+    >>> def square(i):
+    ...     return i * i
+    ...
+    >>> example.func_arg(square)
+    100L
+    >>> square_plus_1 = example.func_ret(square)
+    >>> square_plus_1(4)
+    17L
+    >>> plus_1 = func_cpp()
+    >>> plus_1(number=43)
+    44L
+
+.. warning::
+
+    Keep in mind that passing a function from C++ to Python (or vice versa)
+    will instantiate a piece of wrapper code that translates function
+    invocations between the two languages. Naturally, this translation
+    increases the computational cost of each function call somewhat. A
+    problematic situation can arise when a function is copied back and forth
+    between Python and C++ many times in a row, in which case the underlying
+    wrappers will accumulate correspondingly. The resulting long sequence of
+    C++ -> Python -> C++ -> ... roundtrips can significantly decrease
+    performance.
+
+    There is one exception: pybind11 detects case where a stateless function
+    (i.e. a function pointer or a lambda function without captured variables)
+    is passed as an argument to another C++ function exposed in Python. In this
+    case, there is no overhead. Pybind11 will extract the underlying C++
+    function pointer from the wrapped function to sidestep a potential C++ ->
+    Python -> C++ roundtrip. This is demonstrated in :file:`tests/test_callbacks.cpp`.
+
+.. note::
+
+    This functionality is very useful when generating bindings for callbacks in
+    C++ libraries (e.g. GUI libraries, asynchronous networking libraries, etc.).
+
+    The file :file:`tests/test_callbacks.cpp` contains a complete example
+    that demonstrates how to work with callbacks and anonymous functions in
+    more detail.
diff --git a/3rdparty/pybind11/docs/advanced/cast/index.rst b/3rdparty/pybind11/docs/advanced/cast/index.rst
new file mode 100644
index 00000000..54c10570
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/index.rst
@@ -0,0 +1,42 @@
+Type conversions
+################
+
+Apart from enabling cross-language function calls, a fundamental problem
+that a binding tool like pybind11 must address is to provide access to
+native Python types in C++ and vice versa. There are three fundamentally
+different ways to do this—which approach is preferable for a particular type
+depends on the situation at hand.
+
+1. Use a native C++ type everywhere. In this case, the type must be wrapped
+   using pybind11-generated bindings so that Python can interact with it.
+
+2. Use a native Python type everywhere. It will need to be wrapped so that
+   C++ functions can interact with it.
+
+3. Use a native C++ type on the C++ side and a native Python type on the
+   Python side. pybind11 refers to this as a *type conversion*.
+
+   Type conversions are the most "natural" option in the sense that native
+   (non-wrapped) types are used everywhere. The main downside is that a copy
+   of the data must be made on every Python ↔ C++ transition: this is
+   needed since the C++ and Python versions of the same type generally won't
+   have the same memory layout.
+
+   pybind11 can perform many kinds of conversions automatically. An overview
+   is provided in the table ":ref:`conversion_table`".
+
+The following subsections discuss the differences between these options in more
+detail. The main focus in this section is on type conversions, which represent
+the last case of the above list.
+
+.. toctree::
+   :maxdepth: 1
+
+   overview
+   strings
+   stl
+   functional
+   chrono
+   eigen
+   custom
+
diff --git a/3rdparty/pybind11/docs/advanced/cast/overview.rst b/3rdparty/pybind11/docs/advanced/cast/overview.rst
new file mode 100644
index 00000000..b0e32a52
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/overview.rst
@@ -0,0 +1,165 @@
+Overview
+########
+
+.. rubric:: 1. Native type in C++, wrapper in Python
+
+Exposing a custom C++ type using :class:`py::class_` was covered in detail
+in the :doc:`/classes` section. There, the underlying data structure is
+always the original C++ class while the :class:`py::class_` wrapper provides
+a Python interface. Internally, when an object like this is sent from C++ to
+Python, pybind11 will just add the outer wrapper layer over the native C++
+object. Getting it back from Python is just a matter of peeling off the
+wrapper.
+
+.. rubric:: 2. Wrapper in C++, native type in Python
+
+This is the exact opposite situation. Now, we have a type which is native to
+Python, like a ``tuple`` or a ``list``. One way to get this data into C++ is
+with the :class:`py::object` family of wrappers. These are explained in more
+detail in the :doc:`/advanced/pycpp/object` section. We'll just give a quick
+example here:
+
+.. code-block:: cpp
+
+    void print_list(py::list my_list) {
+        for (auto item : my_list)
+            std::cout << item << " ";
+    }
+
+.. code-block:: pycon
+
+    >>> print_list([1, 2, 3])
+    1 2 3
+
+The Python ``list`` is not converted in any way -- it's just wrapped in a C++
+:class:`py::list` class. At its core it's still a Python object. Copying a
+:class:`py::list` will do the usual reference-counting like in Python.
+Returning the object to Python will just remove the thin wrapper.
+
+.. rubric:: 3. Converting between native C++ and Python types
+
+In the previous two cases we had a native type in one language and a wrapper in
+the other. Now, we have native types on both sides and we convert between them.
+
+.. code-block:: cpp
+
+    void print_vector(const std::vector<int> &v) {
+        for (auto item : v)
+            std::cout << item << "\n";
+    }
+
+.. code-block:: pycon
+
+    >>> print_vector([1, 2, 3])
+    1 2 3
+
+In this case, pybind11 will construct a new ``std::vector<int>`` and copy each
+element from the Python ``list``. The newly constructed object will be passed
+to ``print_vector``. The same thing happens in the other direction: a new
+``list`` is made to match the value returned from C++.
+
+Lots of these conversions are supported out of the box, as shown in the table
+below. They are very convenient, but keep in mind that these conversions are
+fundamentally based on copying data. This is perfectly fine for small immutable
+types but it may become quite expensive for large data structures. This can be
+avoided by overriding the automatic conversion with a custom wrapper (i.e. the
+above-mentioned approach 1). This requires some manual effort and more details
+are available in the :ref:`opaque` section.
+
+.. _conversion_table:
+
+List of all builtin conversions
+-------------------------------
+
+The following basic data types are supported out of the box (some may require
+an additional extension header to be included). To pass other data structures
+as arguments and return values, refer to the section on binding :ref:`classes`.
+
++------------------------------------+---------------------------+-------------------------------+
+|  Data type                         |  Description              | Header file                   |
++====================================+===========================+===============================+
+| ``int8_t``, ``uint8_t``            | 8-bit integers            | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``int16_t``, ``uint16_t``          | 16-bit integers           | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``int32_t``, ``uint32_t``          | 32-bit integers           | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``int64_t``, ``uint64_t``          | 64-bit integers           | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``ssize_t``, ``size_t``            | Platform-dependent size   | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``float``, ``double``              | Floating point types      | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``bool``                           | Two-state Boolean type    | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``char``                           | Character literal         | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``char16_t``                       | UTF-16 character literal  | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``char32_t``                       | UTF-32 character literal  | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``wchar_t``                        | Wide character literal    | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``const char *``                   | UTF-8 string literal      | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``const char16_t *``               | UTF-16 string literal     | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``const char32_t *``               | UTF-32 string literal     | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``const wchar_t *``                | Wide string literal       | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::string``                    | STL dynamic UTF-8 string  | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::u16string``                 | STL dynamic UTF-16 string | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::u32string``                 | STL dynamic UTF-32 string | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::wstring``                   | STL dynamic wide string   | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::string_view``,              | STL C++17 string views    | :file:`pybind11/pybind11.h`   |
+| ``std::u16string_view``, etc.      |                           |                               |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::pair<T1, T2>``              | Pair of two custom types  | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::tuple<...>``                | Arbitrary tuple of types  | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::reference_wrapper<...>``    | Reference type wrapper    | :file:`pybind11/pybind11.h`   |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::complex<T>``                | Complex numbers           | :file:`pybind11/complex.h`    |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::array<T, Size>``            | STL static array          | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::vector<T>``                 | STL dynamic array         | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::deque<T>``                  | STL double-ended queue    | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::valarray<T>``               | STL value array           | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::list<T>``                   | STL linked list           | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::map<T1, T2>``               | STL ordered map           | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::unordered_map<T1, T2>``     | STL unordered map         | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::set<T>``                    | STL ordered set           | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::unordered_set<T>``          | STL unordered set         | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::optional<T>``               | STL optional type (C++17) | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::experimental::optional<T>`` | STL optional type (exp.)  | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::variant<...>``              | Type-safe union (C++17)   | :file:`pybind11/stl.h`        |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::function<...>``             | STL polymorphic function  | :file:`pybind11/functional.h` |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::chrono::duration<...>``     | STL time duration         | :file:`pybind11/chrono.h`     |
++------------------------------------+---------------------------+-------------------------------+
+| ``std::chrono::time_point<...>``   | STL date/time             | :file:`pybind11/chrono.h`     |
++------------------------------------+---------------------------+-------------------------------+
+| ``Eigen::Matrix<...>``             | Eigen: dense matrix       | :file:`pybind11/eigen.h`      |
++------------------------------------+---------------------------+-------------------------------+
+| ``Eigen::Map<...>``                | Eigen: mapped memory      | :file:`pybind11/eigen.h`      |
++------------------------------------+---------------------------+-------------------------------+
+| ``Eigen::SparseMatrix<...>``       | Eigen: sparse matrix      | :file:`pybind11/eigen.h`      |
++------------------------------------+---------------------------+-------------------------------+
diff --git a/3rdparty/pybind11/docs/advanced/cast/stl.rst b/3rdparty/pybind11/docs/advanced/cast/stl.rst
new file mode 100644
index 00000000..e48409f0
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/stl.rst
@@ -0,0 +1,240 @@
+STL containers
+##############
+
+Automatic conversion
+====================
+
+When including the additional header file :file:`pybind11/stl.h`, conversions
+between ``std::vector<>``/``std::deque<>``/``std::list<>``/``std::array<>``,
+``std::set<>``/``std::unordered_set<>``, and
+``std::map<>``/``std::unordered_map<>`` and the Python ``list``, ``set`` and
+``dict`` data structures are automatically enabled. The types ``std::pair<>``
+and ``std::tuple<>`` are already supported out of the box with just the core
+:file:`pybind11/pybind11.h` header.
+
+The major downside of these implicit conversions is that containers must be
+converted (i.e. copied) on every Python->C++ and C++->Python transition, which
+can have implications on the program semantics and performance. Please read the
+next sections for more details and alternative approaches that avoid this.
+
+.. note::
+
+    Arbitrary nesting of any of these types is possible.
+
+.. seealso::
+
+    The file :file:`tests/test_stl.cpp` contains a complete
+    example that demonstrates how to pass STL data types in more detail.
+
+.. _cpp17_container_casters:
+
+C++17 library containers
+========================
+
+The :file:`pybind11/stl.h` header also includes support for ``std::optional<>``
+and ``std::variant<>``. These require a C++17 compiler and standard library.
+In C++14 mode, ``std::experimental::optional<>`` is supported if available.
+
+Various versions of these containers also exist for C++11 (e.g. in Boost).
+pybind11 provides an easy way to specialize the ``type_caster`` for such
+types:
+
+.. code-block:: cpp
+
+    // `boost::optional` as an example -- can be any `std::optional`-like container
+    namespace pybind11 { namespace detail {
+        template <typename T>
+        struct type_caster<boost::optional<T>> : optional_caster<boost::optional<T>> {};
+    }}
+
+The above should be placed in a header file and included in all translation units
+where automatic conversion is needed. Similarly, a specialization can be provided
+for custom variant types:
+
+.. code-block:: cpp
+
+    // `boost::variant` as an example -- can be any `std::variant`-like container
+    namespace pybind11 { namespace detail {
+        template <typename... Ts>
+        struct type_caster<boost::variant<Ts...>> : variant_caster<boost::variant<Ts...>> {};
+
+        // Specifies the function used to visit the variant -- `apply_visitor` instead of `visit`
+        template <>
+        struct visit_helper<boost::variant> {
+            template <typename... Args>
+            static auto call(Args &&...args) -> decltype(boost::apply_visitor(args...)) {
+                return boost::apply_visitor(args...);
+            }
+        };
+    }} // namespace pybind11::detail
+
+The ``visit_helper`` specialization is not required if your ``name::variant`` provides
+a ``name::visit()`` function. For any other function name, the specialization must be
+included to tell pybind11 how to visit the variant.
+
+.. note::
+
+    pybind11 only supports the modern implementation of ``boost::variant``
+    which makes use of variadic templates. This requires Boost 1.56 or newer.
+    Additionally, on Windows, MSVC 2017 is required because ``boost::variant``
+    falls back to the old non-variadic implementation on MSVC 2015.
+
+.. _opaque:
+
+Making opaque types
+===================
+
+pybind11 heavily relies on a template matching mechanism to convert parameters
+and return values that are constructed from STL data types such as vectors,
+linked lists, hash tables, etc. This even works in a recursive manner, for
+instance to deal with lists of hash maps of pairs of elementary and custom
+types, etc.
+
+However, a fundamental limitation of this approach is that internal conversions
+between Python and C++ types involve a copy operation that prevents
+pass-by-reference semantics. What does this mean?
+
+Suppose we bind the following function
+
+.. code-block:: cpp
+
+    void append_1(std::vector<int> &v) {
+       v.push_back(1);
+    }
+
+and call it from Python, the following happens:
+
+.. code-block:: pycon
+
+   >>> v = [5, 6]
+   >>> append_1(v)
+   >>> print(v)
+   [5, 6]
+
+As you can see, when passing STL data structures by reference, modifications
+are not propagated back the Python side. A similar situation arises when
+exposing STL data structures using the ``def_readwrite`` or ``def_readonly``
+functions:
+
+.. code-block:: cpp
+
+    /* ... definition ... */
+
+    class MyClass {
+        std::vector<int> contents;
+    };
+
+    /* ... binding code ... */
+
+    py::class_<MyClass>(m, "MyClass")
+        .def(py::init<>())
+        .def_readwrite("contents", &MyClass::contents);
+
+In this case, properties can be read and written in their entirety. However, an
+``append`` operation involving such a list type has no effect:
+
+.. code-block:: pycon
+
+   >>> m = MyClass()
+   >>> m.contents = [5, 6]
+   >>> print(m.contents)
+   [5, 6]
+   >>> m.contents.append(7)
+   >>> print(m.contents)
+   [5, 6]
+
+Finally, the involved copy operations can be costly when dealing with very
+large lists. To deal with all of the above situations, pybind11 provides a
+macro named ``PYBIND11_MAKE_OPAQUE(T)`` that disables the template-based
+conversion machinery of types, thus rendering them *opaque*. The contents of
+opaque objects are never inspected or extracted, hence they *can* be passed by
+reference. For instance, to turn ``std::vector<int>`` into an opaque type, add
+the declaration
+
+.. code-block:: cpp
+
+    PYBIND11_MAKE_OPAQUE(std::vector<int>);
+
+before any binding code (e.g. invocations to ``class_::def()``, etc.). This
+macro must be specified at the top level (and outside of any namespaces), since
+it instantiates a partial template overload. If your binding code consists of
+multiple compilation units, it must be present in every file (typically via a
+common header) preceding any usage of ``std::vector<int>``. Opaque types must
+also have a corresponding ``class_`` declaration to associate them with a name
+in Python, and to define a set of available operations, e.g.:
+
+.. code-block:: cpp
+
+    py::class_<std::vector<int>>(m, "IntVector")
+        .def(py::init<>())
+        .def("clear", &std::vector<int>::clear)
+        .def("pop_back", &std::vector<int>::pop_back)
+        .def("__len__", [](const std::vector<int> &v) { return v.size(); })
+        .def("__iter__", [](std::vector<int> &v) {
+           return py::make_iterator(v.begin(), v.end());
+        }, py::keep_alive<0, 1>()) /* Keep vector alive while iterator is used */
+        // ....
+
+.. seealso::
+
+    The file :file:`tests/test_opaque_types.cpp` contains a complete
+    example that demonstrates how to create and expose opaque types using
+    pybind11 in more detail.
+
+.. _stl_bind:
+
+Binding STL containers
+======================
+
+The ability to expose STL containers as native Python objects is a fairly
+common request, hence pybind11 also provides an optional header file named
+:file:`pybind11/stl_bind.h` that does exactly this. The mapped containers try
+to match the behavior of their native Python counterparts as much as possible.
+
+The following example showcases usage of :file:`pybind11/stl_bind.h`:
+
+.. code-block:: cpp
+
+    // Don't forget this
+    #include <pybind11/stl_bind.h>
+
+    PYBIND11_MAKE_OPAQUE(std::vector<int>);
+    PYBIND11_MAKE_OPAQUE(std::map<std::string, double>);
+
+    // ...
+
+    // later in binding code:
+    py::bind_vector<std::vector<int>>(m, "VectorInt");
+    py::bind_map<std::map<std::string, double>>(m, "MapStringDouble");
+
+When binding STL containers pybind11 considers the types of the container's
+elements to decide whether the container should be confined to the local module
+(via the :ref:`module_local` feature).  If the container element types are
+anything other than already-bound custom types bound without
+``py::module_local()`` the container binding will have ``py::module_local()``
+applied.  This includes converting types such as numeric types, strings, Eigen
+types; and types that have not yet been bound at the time of the stl container
+binding.  This module-local binding is designed to avoid potential conflicts
+between module bindings (for example, from two separate modules each attempting
+to bind ``std::vector<int>`` as a python type).
+
+It is possible to override this behavior to force a definition to be either
+module-local or global.  To do so, you can pass the attributes
+``py::module_local()`` (to make the binding module-local) or
+``py::module_local(false)`` (to make the binding global) into the
+``py::bind_vector`` or ``py::bind_map`` arguments:
+
+.. code-block:: cpp
+
+    py::bind_vector<std::vector<int>>(m, "VectorInt", py::module_local(false));
+
+Note, however, that such a global binding would make it impossible to load this
+module at the same time as any other pybind module that also attempts to bind
+the same container type (``std::vector<int>`` in the above example).
+
+See :ref:`module_local` for more details on module-local bindings.
+
+.. seealso::
+
+    The file :file:`tests/test_stl_binders.cpp` shows how to use the
+    convenience STL container wrappers.
diff --git a/3rdparty/pybind11/docs/advanced/cast/strings.rst b/3rdparty/pybind11/docs/advanced/cast/strings.rst
new file mode 100644
index 00000000..e25701ec
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/cast/strings.rst
@@ -0,0 +1,305 @@
+Strings, bytes and Unicode conversions
+######################################
+
+.. note::
+
+    This section discusses string handling in terms of Python 3 strings. For
+    Python 2.7, replace all occurrences of ``str`` with ``unicode`` and
+    ``bytes`` with ``str``.  Python 2.7 users may find it best to use ``from
+    __future__ import unicode_literals`` to avoid unintentionally using ``str``
+    instead of ``unicode``.
+
+Passing Python strings to C++
+=============================
+
+When a Python ``str`` is passed from Python to a C++ function that accepts
+``std::string`` or ``char *`` as arguments, pybind11 will encode the Python
+string to UTF-8. All Python ``str`` can be encoded in UTF-8, so this operation
+does not fail.
+
+The C++ language is encoding agnostic. It is the responsibility of the
+programmer to track encodings. It's often easiest to simply `use UTF-8
+everywhere <http://utf8everywhere.org/>`_.
+
+.. code-block:: c++
+
+    m.def("utf8_test",
+        [](const std::string &s) {
+            cout << "utf-8 is icing on the cake.\n";
+            cout << s;
+        }
+    );
+    m.def("utf8_charptr",
+        [](const char *s) {
+            cout << "My favorite food is\n";
+            cout << s;
+        }
+    );
+
+.. code-block:: python
+
+    >>> utf8_test('🎂')
+    utf-8 is icing on the cake.
+    🎂
+
+    >>> utf8_charptr('🍕')
+    My favorite food is
+    🍕
+
+.. note::
+
+    Some terminal emulators do not support UTF-8 or emoji fonts and may not
+    display the example above correctly.
+
+The results are the same whether the C++ function accepts arguments by value or
+reference, and whether or not ``const`` is used.
+
+Passing bytes to C++
+--------------------
+
+A Python ``bytes`` object will be passed to C++ functions that accept
+``std::string`` or ``char*`` *without* conversion.  On Python 3, in order to
+make a function *only* accept ``bytes`` (and not ``str``), declare it as taking
+a ``py::bytes`` argument.
+
+
+Returning C++ strings to Python
+===============================
+
+When a C++ function returns a ``std::string`` or ``char*`` to a Python caller,
+**pybind11 will assume that the string is valid UTF-8** and will decode it to a
+native Python ``str``, using the same API as Python uses to perform
+``bytes.decode('utf-8')``. If this implicit conversion fails, pybind11 will
+raise a ``UnicodeDecodeError``.
+
+.. code-block:: c++
+
+    m.def("std_string_return",
+        []() {
+            return std::string("This string needs to be UTF-8 encoded");
+        }
+    );
+
+.. code-block:: python
+
+    >>> isinstance(example.std_string_return(), str)
+    True
+
+
+Because UTF-8 is inclusive of pure ASCII, there is never any issue with
+returning a pure ASCII string to Python. If there is any possibility that the
+string is not pure ASCII, it is necessary to ensure the encoding is valid
+UTF-8.
+
+.. warning::
+
+    Implicit conversion assumes that a returned ``char *`` is null-terminated.
+    If there is no null terminator a buffer overrun will occur.
+
+Explicit conversions
+--------------------
+
+If some C++ code constructs a ``std::string`` that is not a UTF-8 string, one
+can perform a explicit conversion and return a ``py::str`` object. Explicit
+conversion has the same overhead as implicit conversion.
+
+.. code-block:: c++
+
+    // This uses the Python C API to convert Latin-1 to Unicode
+    m.def("str_output",
+        []() {
+            std::string s = "Send your r\xe9sum\xe9 to Alice in HR"; // Latin-1
+            py::str py_s = PyUnicode_DecodeLatin1(s.data(), s.length());
+            return py_s;
+        }
+    );
+
+.. code-block:: python
+
+    >>> str_output()
+    'Send your résumé to Alice in HR'
+
+The `Python C API
+<https://docs.python.org/3/c-api/unicode.html#built-in-codecs>`_ provides
+several built-in codecs.
+
+
+One could also use a third party encoding library such as libiconv to transcode
+to UTF-8.
+
+Return C++ strings without conversion
+-------------------------------------
+
+If the data in a C++ ``std::string`` does not represent text and should be
+returned to Python as ``bytes``, then one can return the data as a
+``py::bytes`` object.
+
+.. code-block:: c++
+
+    m.def("return_bytes",
+        []() {
+            std::string s("\xba\xd0\xba\xd0");  // Not valid UTF-8
+            return py::bytes(s);  // Return the data without transcoding
+        }
+    );
+
+.. code-block:: python
+
+    >>> example.return_bytes()
+    b'\xba\xd0\xba\xd0'
+
+
+Note the asymmetry: pybind11 will convert ``bytes`` to ``std::string`` without
+encoding, but cannot convert ``std::string`` back to ``bytes`` implicitly.
+
+.. code-block:: c++
+
+    m.def("asymmetry",
+        [](std::string s) {  // Accepts str or bytes from Python
+            return s;  // Looks harmless, but implicitly converts to str
+        }
+    );
+
+.. code-block:: python
+
+    >>> isinstance(example.asymmetry(b"have some bytes"), str)
+    True
+
+    >>> example.asymmetry(b"\xba\xd0\xba\xd0")  # invalid utf-8 as bytes
+    UnicodeDecodeError: 'utf-8' codec can't decode byte 0xba in position 0: invalid start byte
+
+
+Wide character strings
+======================
+
+When a Python ``str`` is passed to a C++ function expecting ``std::wstring``,
+``wchar_t*``, ``std::u16string`` or ``std::u32string``, the ``str`` will be
+encoded to UTF-16 or UTF-32 depending on how the C++ compiler implements each
+type, in the platform's native endianness. When strings of these types are
+returned, they are assumed to contain valid UTF-16 or UTF-32, and will be
+decoded to Python ``str``.
+
+.. code-block:: c++
+
+    #define UNICODE
+    #include <windows.h>
+
+    m.def("set_window_text",
+        [](HWND hwnd, std::wstring s) {
+            // Call SetWindowText with null-terminated UTF-16 string
+            ::SetWindowText(hwnd, s.c_str());
+        }
+    );
+    m.def("get_window_text",
+        [](HWND hwnd) {
+            const int buffer_size = ::GetWindowTextLength(hwnd) + 1;
+            auto buffer = std::make_unique< wchar_t[] >(buffer_size);
+
+            ::GetWindowText(hwnd, buffer.data(), buffer_size);
+
+            std::wstring text(buffer.get());
+
+            // wstring will be converted to Python str
+            return text;
+        }
+    );
+
+.. warning::
+
+    Wide character strings may not work as described on Python 2.7 or Python
+    3.3 compiled with ``--enable-unicode=ucs2``.
+
+Strings in multibyte encodings such as Shift-JIS must transcoded to a
+UTF-8/16/32 before being returned to Python.
+
+
+Character literals
+==================
+
+C++ functions that accept character literals as input will receive the first
+character of a Python ``str`` as their input. If the string is longer than one
+Unicode character, trailing characters will be ignored.
+
+When a character literal is returned from C++ (such as a ``char`` or a
+``wchar_t``), it will be converted to a ``str`` that represents the single
+character.
+
+.. code-block:: c++
+
+    m.def("pass_char", [](char c) { return c; });
+    m.def("pass_wchar", [](wchar_t w) { return w; });
+
+.. code-block:: python
+
+    >>> example.pass_char('A')
+    'A'
+
+While C++ will cast integers to character types (``char c = 0x65;``), pybind11
+does not convert Python integers to characters implicitly. The Python function
+``chr()`` can be used to convert integers to characters.
+
+.. code-block:: python
+
+    >>> example.pass_char(0x65)
+    TypeError
+
+    >>> example.pass_char(chr(0x65))
+    'A'
+
+If the desire is to work with an 8-bit integer, use ``int8_t`` or ``uint8_t``
+as the argument type.
+
+Grapheme clusters
+-----------------
+
+A single grapheme may be represented by two or more Unicode characters. For
+example 'é' is usually represented as U+00E9 but can also be expressed as the
+combining character sequence U+0065 U+0301 (that is, the letter 'e' followed by
+a combining acute accent). The combining character will be lost if the
+two-character sequence is passed as an argument, even though it renders as a
+single grapheme.
+
+.. code-block:: python
+
+    >>> example.pass_wchar('é')
+    'é'
+
+    >>> combining_e_acute = 'e' + '\u0301'
+
+    >>> combining_e_acute
+    'é'
+
+    >>> combining_e_acute == 'é'
+    False
+
+    >>> example.pass_wchar(combining_e_acute)
+    'e'
+
+Normalizing combining characters before passing the character literal to C++
+may resolve *some* of these issues:
+
+.. code-block:: python
+
+    >>> example.pass_wchar(unicodedata.normalize('NFC', combining_e_acute))
+    'é'
+
+In some languages (Thai for example), there are `graphemes that cannot be
+expressed as a single Unicode code point
+<http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries>`_, so there is
+no way to capture them in a C++ character type.
+
+
+C++17 string views
+==================
+
+C++17 string views are automatically supported when compiling in C++17 mode.
+They follow the same rules for encoding and decoding as the corresponding STL
+string type (for example, a ``std::u16string_view`` argument will be passed
+UTF-16-encoded data, and a returned ``std::string_view`` will be decoded as
+UTF-8).
+
+References
+==========
+
+* `The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) <https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/>`_
+* `C++ - Using STL Strings at Win32 API Boundaries <https://msdn.microsoft.com/en-ca/magazine/mt238407.aspx>`_
diff --git a/3rdparty/pybind11/docs/advanced/classes.rst b/3rdparty/pybind11/docs/advanced/classes.rst
new file mode 100644
index 00000000..ae5907de
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/classes.rst
@@ -0,0 +1,1126 @@
+Classes
+#######
+
+This section presents advanced binding code for classes and it is assumed
+that you are already familiar with the basics from :doc:`/classes`.
+
+.. _overriding_virtuals:
+
+Overriding virtual functions in Python
+======================================
+
+Suppose that a C++ class or interface has a virtual function that we'd like to
+to override from within Python (we'll focus on the class ``Animal``; ``Dog`` is
+given as a specific example of how one would do this with traditional C++
+code).
+
+.. code-block:: cpp
+
+    class Animal {
+    public:
+        virtual ~Animal() { }
+        virtual std::string go(int n_times) = 0;
+    };
+
+    class Dog : public Animal {
+    public:
+        std::string go(int n_times) override {
+            std::string result;
+            for (int i=0; i<n_times; ++i)
+                result += "woof! ";
+            return result;
+        }
+    };
+
+Let's also suppose that we are given a plain function which calls the
+function ``go()`` on an arbitrary ``Animal`` instance.
+
+.. code-block:: cpp
+
+    std::string call_go(Animal *animal) {
+        return animal->go(3);
+    }
+
+Normally, the binding code for these classes would look as follows:
+
+.. code-block:: cpp
+
+    PYBIND11_MODULE(example, m) {
+        py::class_<Animal>(m, "Animal")
+            .def("go", &Animal::go);
+
+        py::class_<Dog, Animal>(m, "Dog")
+            .def(py::init<>());
+
+        m.def("call_go", &call_go);
+    }
+
+However, these bindings are impossible to extend: ``Animal`` is not
+constructible, and we clearly require some kind of "trampoline" that
+redirects virtual calls back to Python.
+
+Defining a new type of ``Animal`` from within Python is possible but requires a
+helper class that is defined as follows:
+
+.. code-block:: cpp
+
+    class PyAnimal : public Animal {
+    public:
+        /* Inherit the constructors */
+        using Animal::Animal;
+
+        /* Trampoline (need one for each virtual function) */
+        std::string go(int n_times) override {
+            PYBIND11_OVERLOAD_PURE(
+                std::string, /* Return type */
+                Animal,      /* Parent class */
+                go,          /* Name of function in C++ (must match Python name) */
+                n_times      /* Argument(s) */
+            );
+        }
+    };
+
+The macro :c:macro:`PYBIND11_OVERLOAD_PURE` should be used for pure virtual
+functions, and :c:macro:`PYBIND11_OVERLOAD` should be used for functions which have
+a default implementation.  There are also two alternate macros 
+:c:macro:`PYBIND11_OVERLOAD_PURE_NAME` and :c:macro:`PYBIND11_OVERLOAD_NAME` which
+take a string-valued name argument between the *Parent class* and *Name of the
+function* slots, which defines the name of function in Python. This is required
+when the C++ and Python versions of the
+function have different names, e.g.  ``operator()`` vs ``__call__``.
+
+The binding code also needs a few minor adaptations (highlighted):
+
+.. code-block:: cpp
+    :emphasize-lines: 2,3
+
+    PYBIND11_MODULE(example, m) {
+        py::class_<Animal, PyAnimal /* <--- trampoline*/>(m, "Animal")
+            .def(py::init<>())
+            .def("go", &Animal::go);
+
+        py::class_<Dog, Animal>(m, "Dog")
+            .def(py::init<>());
+
+        m.def("call_go", &call_go);
+    }
+
+Importantly, pybind11 is made aware of the trampoline helper class by
+specifying it as an extra template argument to :class:`class_`. (This can also
+be combined with other template arguments such as a custom holder type; the
+order of template types does not matter).  Following this, we are able to
+define a constructor as usual.
+
+Bindings should be made against the actual class, not the trampoline helper class.
+
+.. code-block:: cpp
+    :emphasize-lines: 3
+
+    py::class_<Animal, PyAnimal /* <--- trampoline*/>(m, "Animal");
+        .def(py::init<>())
+        .def("go", &PyAnimal::go); /* <--- THIS IS WRONG, use &Animal::go */
+
+Note, however, that the above is sufficient for allowing python classes to
+extend ``Animal``, but not ``Dog``: see :ref:`virtual_and_inheritance` for the
+necessary steps required to providing proper overload support for inherited
+classes.
+
+The Python session below shows how to override ``Animal::go`` and invoke it via
+a virtual method call.
+
+.. code-block:: pycon
+
+    >>> from example import *
+    >>> d = Dog()
+    >>> call_go(d)
+    u'woof! woof! woof! '
+    >>> class Cat(Animal):
+    ...     def go(self, n_times):
+    ...             return "meow! " * n_times
+    ...
+    >>> c = Cat()
+    >>> call_go(c)
+    u'meow! meow! meow! '
+
+If you are defining a custom constructor in a derived Python class, you *must*
+ensure that you explicitly call the bound C++ constructor using ``__init__``,
+*regardless* of whether it is a default constructor or not. Otherwise, the
+memory for the C++ portion of the instance will be left uninitialized, which
+will generally leave the C++ instance in an invalid state and cause undefined
+behavior if the C++ instance is subsequently used.
+
+Here is an example:
+
+.. code-block:: python
+
+    class Dachshund(Dog):
+        def __init__(self, name):
+            Dog.__init__(self) # Without this, undefined behavior may occur if the C++ portions are referenced.
+            self.name = name
+        def bark(self):
+            return "yap!"
+
+Note that a direct ``__init__`` constructor *should be called*, and ``super()``
+should not be used. For simple cases of linear inheritance, ``super()``
+may work, but once you begin mixing Python and C++ multiple inheritance,
+things will fall apart due to differences between Python's MRO and C++'s
+mechanisms.
+
+Please take a look at the :ref:`macro_notes` before using this feature.
+
+.. note::
+
+    When the overridden type returns a reference or pointer to a type that
+    pybind11 converts from Python (for example, numeric values, std::string,
+    and other built-in value-converting types), there are some limitations to
+    be aware of:
+
+    - because in these cases there is no C++ variable to reference (the value
+      is stored in the referenced Python variable), pybind11 provides one in
+      the PYBIND11_OVERLOAD macros (when needed) with static storage duration.
+      Note that this means that invoking the overloaded method on *any*
+      instance will change the referenced value stored in *all* instances of
+      that type.
+
+    - Attempts to modify a non-const reference will not have the desired
+      effect: it will change only the static cache variable, but this change
+      will not propagate to underlying Python instance, and the change will be
+      replaced the next time the overload is invoked.
+
+.. seealso::
+
+    The file :file:`tests/test_virtual_functions.cpp` contains a complete
+    example that demonstrates how to override virtual functions using pybind11
+    in more detail.
+
+.. _virtual_and_inheritance:
+
+Combining virtual functions and inheritance
+===========================================
+
+When combining virtual methods with inheritance, you need to be sure to provide
+an override for each method for which you want to allow overrides from derived
+python classes.  For example, suppose we extend the above ``Animal``/``Dog``
+example as follows:
+
+.. code-block:: cpp
+
+    class Animal {
+    public:
+        virtual std::string go(int n_times) = 0;
+        virtual std::string name() { return "unknown"; }
+    };
+    class Dog : public Animal {
+    public:
+        std::string go(int n_times) override {
+            std::string result;
+            for (int i=0; i<n_times; ++i)
+                result += bark() + " ";
+            return result;
+        }
+        virtual std::string bark() { return "woof!"; }
+    };
+
+then the trampoline class for ``Animal`` must, as described in the previous
+section, override ``go()`` and ``name()``, but in order to allow python code to
+inherit properly from ``Dog``, we also need a trampoline class for ``Dog`` that
+overrides both the added ``bark()`` method *and* the ``go()`` and ``name()``
+methods inherited from ``Animal`` (even though ``Dog`` doesn't directly
+override the ``name()`` method):
+
+.. code-block:: cpp
+
+    class PyAnimal : public Animal {
+    public:
+        using Animal::Animal; // Inherit constructors
+        std::string go(int n_times) override { PYBIND11_OVERLOAD_PURE(std::string, Animal, go, n_times); }
+        std::string name() override { PYBIND11_OVERLOAD(std::string, Animal, name, ); }
+    };
+    class PyDog : public Dog {
+    public:
+        using Dog::Dog; // Inherit constructors
+        std::string go(int n_times) override { PYBIND11_OVERLOAD(std::string, Dog, go, n_times); }
+        std::string name() override { PYBIND11_OVERLOAD(std::string, Dog, name, ); }
+        std::string bark() override { PYBIND11_OVERLOAD(std::string, Dog, bark, ); }
+    };
+
+.. note::
+
+    Note the trailing commas in the ``PYBIND11_OVERLOAD`` calls to ``name()``
+    and ``bark()``. These are needed to portably implement a trampoline for a
+    function that does not take any arguments. For functions that take
+    a nonzero number of arguments, the trailing comma must be omitted.
+
+A registered class derived from a pybind11-registered class with virtual
+methods requires a similar trampoline class, *even if* it doesn't explicitly
+declare or override any virtual methods itself:
+
+.. code-block:: cpp
+
+    class Husky : public Dog {};
+    class PyHusky : public Husky {
+    public:
+        using Husky::Husky; // Inherit constructors
+        std::string go(int n_times) override { PYBIND11_OVERLOAD_PURE(std::string, Husky, go, n_times); }
+        std::string name() override { PYBIND11_OVERLOAD(std::string, Husky, name, ); }
+        std::string bark() override { PYBIND11_OVERLOAD(std::string, Husky, bark, ); }
+    };
+
+There is, however, a technique that can be used to avoid this duplication
+(which can be especially helpful for a base class with several virtual
+methods).  The technique involves using template trampoline classes, as
+follows:
+
+.. code-block:: cpp
+
+    template <class AnimalBase = Animal> class PyAnimal : public AnimalBase {
+    public:
+        using AnimalBase::AnimalBase; // Inherit constructors
+        std::string go(int n_times) override { PYBIND11_OVERLOAD_PURE(std::string, AnimalBase, go, n_times); }
+        std::string name() override { PYBIND11_OVERLOAD(std::string, AnimalBase, name, ); }
+    };
+    template <class DogBase = Dog> class PyDog : public PyAnimal<DogBase> {
+    public:
+        using PyAnimal<DogBase>::PyAnimal; // Inherit constructors
+        // Override PyAnimal's pure virtual go() with a non-pure one:
+        std::string go(int n_times) override { PYBIND11_OVERLOAD(std::string, DogBase, go, n_times); }
+        std::string bark() override { PYBIND11_OVERLOAD(std::string, DogBase, bark, ); }
+    };
+
+This technique has the advantage of requiring just one trampoline method to be
+declared per virtual method and pure virtual method override.  It does,
+however, require the compiler to generate at least as many methods (and
+possibly more, if both pure virtual and overridden pure virtual methods are
+exposed, as above).
+
+The classes are then registered with pybind11 using:
+
+.. code-block:: cpp
+
+    py::class_<Animal, PyAnimal<>> animal(m, "Animal");
+    py::class_<Dog, PyDog<>> dog(m, "Dog");
+    py::class_<Husky, PyDog<Husky>> husky(m, "Husky");
+    // ... add animal, dog, husky definitions
+
+Note that ``Husky`` did not require a dedicated trampoline template class at
+all, since it neither declares any new virtual methods nor provides any pure
+virtual method implementations.
+
+With either the repeated-virtuals or templated trampoline methods in place, you
+can now create a python class that inherits from ``Dog``:
+
+.. code-block:: python
+
+    class ShihTzu(Dog):
+        def bark(self):
+            return "yip!"
+
+.. seealso::
+
+    See the file :file:`tests/test_virtual_functions.cpp` for complete examples
+    using both the duplication and templated trampoline approaches.
+
+.. _extended_aliases:
+
+Extended trampoline class functionality
+=======================================
+
+.. _extended_class_functionality_forced_trampoline:
+
+Forced trampoline class initialisation
+--------------------------------------
+The trampoline classes described in the previous sections are, by default, only
+initialized when needed.  More specifically, they are initialized when a python
+class actually inherits from a registered type (instead of merely creating an
+instance of the registered type), or when a registered constructor is only
+valid for the trampoline class but not the registered class.  This is primarily
+for performance reasons: when the trampoline class is not needed for anything
+except virtual method dispatching, not initializing the trampoline class
+improves performance by avoiding needing to do a run-time check to see if the
+inheriting python instance has an overloaded method.
+
+Sometimes, however, it is useful to always initialize a trampoline class as an
+intermediate class that does more than just handle virtual method dispatching.
+For example, such a class might perform extra class initialization, extra
+destruction operations, and might define new members and methods to enable a
+more python-like interface to a class.
+
+In order to tell pybind11 that it should *always* initialize the trampoline
+class when creating new instances of a type, the class constructors should be
+declared using ``py::init_alias<Args, ...>()`` instead of the usual
+``py::init<Args, ...>()``.  This forces construction via the trampoline class,
+ensuring member initialization and (eventual) destruction.
+
+.. seealso::
+
+    See the file :file:`tests/test_virtual_functions.cpp` for complete examples
+    showing both normal and forced trampoline instantiation.
+
+Different method signatures
+---------------------------
+The macro's introduced in :ref:`overriding_virtuals` cover most of the standard
+use cases when exposing C++ classes to Python. Sometimes it is hard or unwieldy
+to create a direct one-on-one mapping between the arguments and method return
+type.
+
+An example would be when the C++ signature contains output arguments using
+references (See also :ref:`faq_reference_arguments`). Another way of solving
+this is to use the method body of the trampoline class to do conversions to the
+input and return of the Python method.
+
+The main building block to do so is the :func:`get_overload`, this function
+allows retrieving a method implemented in Python from within the trampoline's
+methods. Consider for example a C++ method which has the signature
+``bool myMethod(int32_t& value)``, where the return indicates whether
+something should be done with the ``value``. This can be made convenient on the
+Python side by allowing the Python function to return ``None`` or an ``int``:
+
+.. code-block:: cpp
+
+    bool MyClass::myMethod(int32_t& value)
+    {
+        pybind11::gil_scoped_acquire gil;  // Acquire the GIL while in this scope.
+        // Try to look up the overloaded method on the Python side.
+        pybind11::function overload = pybind11::get_overload(this, "myMethod");
+        if (overload) {  // method is found
+            auto obj = overload(value);  // Call the Python function.
+            if (py::isinstance<py::int_>(obj)) {  // check if it returned a Python integer type
+                value = obj.cast<int32_t>();  // Cast it and assign it to the value.
+                return true;  // Return true; value should be used.
+            } else {
+                return false;  // Python returned none, return false.
+            }
+        }
+        return false;  // Alternatively return MyClass::myMethod(value);
+    }
+
+
+.. _custom_constructors:
+
+Custom constructors
+===================
+
+The syntax for binding constructors was previously introduced, but it only
+works when a constructor of the appropriate arguments actually exists on the
+C++ side.  To extend this to more general cases, pybind11 makes it possible
+to bind factory functions as constructors. For example, suppose you have a
+class like this:
+
+.. code-block:: cpp
+
+    class Example {
+    private:
+        Example(int); // private constructor
+    public:
+        // Factory function:
+        static Example create(int a) { return Example(a); }
+    };
+
+    py::class_<Example>(m, "Example")
+        .def(py::init(&Example::create));
+
+While it is possible to create a straightforward binding of the static
+``create`` method, it may sometimes be preferable to expose it as a constructor
+on the Python side. This can be accomplished by calling ``.def(py::init(...))``
+with the function reference returning the new instance passed as an argument.
+It is also possible to use this approach to bind a function returning a new
+instance by raw pointer or by the holder (e.g. ``std::unique_ptr``).
+
+The following example shows the different approaches:
+
+.. code-block:: cpp
+
+    class Example {
+    private:
+        Example(int); // private constructor
+    public:
+        // Factory function - returned by value:
+        static Example create(int a) { return Example(a); }
+
+        // These constructors are publicly callable:
+        Example(double);
+        Example(int, int);
+        Example(std::string);
+    };
+
+    py::class_<Example>(m, "Example")
+        // Bind the factory function as a constructor:
+        .def(py::init(&Example::create))
+        // Bind a lambda function returning a pointer wrapped in a holder:
+        .def(py::init([](std::string arg) {
+            return std::unique_ptr<Example>(new Example(arg));
+        }))
+        // Return a raw pointer:
+        .def(py::init([](int a, int b) { return new Example(a, b); }))
+        // You can mix the above with regular C++ constructor bindings as well:
+        .def(py::init<double>())
+        ;
+
+When the constructor is invoked from Python, pybind11 will call the factory
+function and store the resulting C++ instance in the Python instance.
+
+When combining factory functions constructors with :ref:`virtual function
+trampolines <overriding_virtuals>` there are two approaches.  The first is to
+add a constructor to the alias class that takes a base value by
+rvalue-reference.  If such a constructor is available, it will be used to
+construct an alias instance from the value returned by the factory function.
+The second option is to provide two factory functions to ``py::init()``: the
+first will be invoked when no alias class is required (i.e. when the class is
+being used but not inherited from in Python), and the second will be invoked
+when an alias is required.
+
+You can also specify a single factory function that always returns an alias
+instance: this will result in behaviour similar to ``py::init_alias<...>()``,
+as described in the :ref:`extended trampoline class documentation
+<extended_aliases>`.
+
+The following example shows the different factory approaches for a class with
+an alias:
+
+.. code-block:: cpp
+
+    #include <pybind11/factory.h>
+    class Example {
+    public:
+        // ...
+        virtual ~Example() = default;
+    };
+    class PyExample : public Example {
+    public:
+        using Example::Example;
+        PyExample(Example &&base) : Example(std::move(base)) {}
+    };
+    py::class_<Example, PyExample>(m, "Example")
+        // Returns an Example pointer.  If a PyExample is needed, the Example
+        // instance will be moved via the extra constructor in PyExample, above.
+        .def(py::init([]() { return new Example(); }))
+        // Two callbacks:
+        .def(py::init([]() { return new Example(); } /* no alias needed */,
+                      []() { return new PyExample(); } /* alias needed */))
+        // *Always* returns an alias instance (like py::init_alias<>())
+        .def(py::init([]() { return new PyExample(); }))
+        ;
+
+Brace initialization
+--------------------
+
+``pybind11::init<>`` internally uses C++11 brace initialization to call the
+constructor of the target class. This means that it can be used to bind
+*implicit* constructors as well:
+
+.. code-block:: cpp
+
+    struct Aggregate {
+        int a;
+        std::string b;
+    };
+
+    py::class_<Aggregate>(m, "Aggregate")
+        .def(py::init<int, const std::string &>());
+
+.. note::
+
+    Note that brace initialization preferentially invokes constructor overloads
+    taking a ``std::initializer_list``. In the rare event that this causes an
+    issue, you can work around it by using ``py::init(...)`` with a lambda
+    function that constructs the new object as desired.
+
+.. _classes_with_non_public_destructors:
+
+Non-public destructors
+======================
+
+If a class has a private or protected destructor (as might e.g. be the case in
+a singleton pattern), a compile error will occur when creating bindings via
+pybind11. The underlying issue is that the ``std::unique_ptr`` holder type that
+is responsible for managing the lifetime of instances will reference the
+destructor even if no deallocations ever take place. In order to expose classes
+with private or protected destructors, it is possible to override the holder
+type via a holder type argument to ``class_``. Pybind11 provides a helper class
+``py::nodelete`` that disables any destructor invocations. In this case, it is
+crucial that instances are deallocated on the C++ side to avoid memory leaks.
+
+.. code-block:: cpp
+
+    /* ... definition ... */
+
+    class MyClass {
+    private:
+        ~MyClass() { }
+    };
+
+    /* ... binding code ... */
+
+    py::class_<MyClass, std::unique_ptr<MyClass, py::nodelete>>(m, "MyClass")
+        .def(py::init<>())
+
+.. _implicit_conversions:
+
+Implicit conversions
+====================
+
+Suppose that instances of two types ``A`` and ``B`` are used in a project, and
+that an ``A`` can easily be converted into an instance of type ``B`` (examples of this
+could be a fixed and an arbitrary precision number type).
+
+.. code-block:: cpp
+
+    py::class_<A>(m, "A")
+        /// ... members ...
+
+    py::class_<B>(m, "B")
+        .def(py::init<A>())
+        /// ... members ...
+
+    m.def("func",
+        [](const B &) { /* .... */ }
+    );
+
+To invoke the function ``func`` using a variable ``a`` containing an ``A``
+instance, we'd have to write ``func(B(a))`` in Python. On the other hand, C++
+will automatically apply an implicit type conversion, which makes it possible
+to directly write ``func(a)``.
+
+In this situation (i.e. where ``B`` has a constructor that converts from
+``A``), the following statement enables similar implicit conversions on the
+Python side:
+
+.. code-block:: cpp
+
+    py::implicitly_convertible<A, B>();
+
+.. note::
+
+    Implicit conversions from ``A`` to ``B`` only work when ``B`` is a custom
+    data type that is exposed to Python via pybind11.
+
+    To prevent runaway recursion, implicit conversions are non-reentrant: an
+    implicit conversion invoked as part of another implicit conversion of the
+    same type (i.e. from ``A`` to ``B``) will fail.
+
+.. _static_properties:
+
+Static properties
+=================
+
+The section on :ref:`properties` discussed the creation of instance properties
+that are implemented in terms of C++ getters and setters.
+
+Static properties can also be created in a similar way to expose getters and
+setters of static class attributes. Note that the implicit ``self`` argument
+also exists in this case and is used to pass the Python ``type`` subclass
+instance. This parameter will often not be needed by the C++ side, and the
+following example illustrates how to instantiate a lambda getter function
+that ignores it:
+
+.. code-block:: cpp
+
+    py::class_<Foo>(m, "Foo")
+        .def_property_readonly_static("foo", [](py::object /* self */) { return Foo(); });
+
+Operator overloading
+====================
+
+Suppose that we're given the following ``Vector2`` class with a vector addition
+and scalar multiplication operation, all implemented using overloaded operators
+in C++.
+
+.. code-block:: cpp
+
+    class Vector2 {
+    public:
+        Vector2(float x, float y) : x(x), y(y) { }
+
+        Vector2 operator+(const Vector2 &v) const { return Vector2(x + v.x, y + v.y); }
+        Vector2 operator*(float value) const { return Vector2(x * value, y * value); }
+        Vector2& operator+=(const Vector2 &v) { x += v.x; y += v.y; return *this; }
+        Vector2& operator*=(float v) { x *= v; y *= v; return *this; }
+
+        friend Vector2 operator*(float f, const Vector2 &v) {
+            return Vector2(f * v.x, f * v.y);
+        }
+
+        std::string toString() const {
+            return "[" + std::to_string(x) + ", " + std::to_string(y) + "]";
+        }
+    private:
+        float x, y;
+    };
+
+The following snippet shows how the above operators can be conveniently exposed
+to Python.
+
+.. code-block:: cpp
+
+    #include <pybind11/operators.h>
+
+    PYBIND11_MODULE(example, m) {
+        py::class_<Vector2>(m, "Vector2")
+            .def(py::init<float, float>())
+            .def(py::self + py::self)
+            .def(py::self += py::self)
+            .def(py::self *= float())
+            .def(float() * py::self)
+            .def(py::self * float())
+            .def(-py::self)
+            .def("__repr__", &Vector2::toString);
+    }
+
+Note that a line like
+
+.. code-block:: cpp
+
+            .def(py::self * float())
+
+is really just short hand notation for
+
+.. code-block:: cpp
+
+    .def("__mul__", [](const Vector2 &a, float b) {
+        return a * b;
+    }, py::is_operator())
+
+This can be useful for exposing additional operators that don't exist on the
+C++ side, or to perform other types of customization. The ``py::is_operator``
+flag marker is needed to inform pybind11 that this is an operator, which
+returns ``NotImplemented`` when invoked with incompatible arguments rather than
+throwing a type error.
+
+.. note::
+
+    To use the more convenient ``py::self`` notation, the additional
+    header file :file:`pybind11/operators.h` must be included.
+
+.. seealso::
+
+    The file :file:`tests/test_operator_overloading.cpp` contains a
+    complete example that demonstrates how to work with overloaded operators in
+    more detail.
+
+.. _pickling:
+
+Pickling support
+================
+
+Python's ``pickle`` module provides a powerful facility to serialize and
+de-serialize a Python object graph into a binary data stream. To pickle and
+unpickle C++ classes using pybind11, a ``py::pickle()`` definition must be
+provided. Suppose the class in question has the following signature:
+
+.. code-block:: cpp
+
+    class Pickleable {
+    public:
+        Pickleable(const std::string &value) : m_value(value) { }
+        const std::string &value() const { return m_value; }
+
+        void setExtra(int extra) { m_extra = extra; }
+        int extra() const { return m_extra; }
+    private:
+        std::string m_value;
+        int m_extra = 0;
+    };
+
+Pickling support in Python is enabled by defining the ``__setstate__`` and
+``__getstate__`` methods [#f3]_. For pybind11 classes, use ``py::pickle()``
+to bind these two functions:
+
+.. code-block:: cpp
+
+    py::class_<Pickleable>(m, "Pickleable")
+        .def(py::init<std::string>())
+        .def("value", &Pickleable::value)
+        .def("extra", &Pickleable::extra)
+        .def("setExtra", &Pickleable::setExtra)
+        .def(py::pickle(
+            [](const Pickleable &p) { // __getstate__
+                /* Return a tuple that fully encodes the state of the object */
+                return py::make_tuple(p.value(), p.extra());
+            },
+            [](py::tuple t) { // __setstate__
+                if (t.size() != 2)
+                    throw std::runtime_error("Invalid state!");
+
+                /* Create a new C++ instance */
+                Pickleable p(t[0].cast<std::string>());
+
+                /* Assign any additional state */
+                p.setExtra(t[1].cast<int>());
+
+                return p;
+            }
+        ));
+
+The ``__setstate__`` part of the ``py::picke()`` definition follows the same
+rules as the single-argument version of ``py::init()``. The return type can be
+a value, pointer or holder type. See :ref:`custom_constructors` for details.
+
+An instance can now be pickled as follows:
+
+.. code-block:: python
+
+    try:
+        import cPickle as pickle  # Use cPickle on Python 2.7
+    except ImportError:
+        import pickle
+
+    p = Pickleable("test_value")
+    p.setExtra(15)
+    data = pickle.dumps(p, 2)
+
+Note that only the cPickle module is supported on Python 2.7. The second
+argument to ``dumps`` is also crucial: it selects the pickle protocol version
+2, since the older version 1 is not supported. Newer versions are also fine—for
+instance, specify ``-1`` to always use the latest available version. Beware:
+failure to follow these instructions will cause important pybind11 memory
+allocation routines to be skipped during unpickling, which will likely lead to
+memory corruption and/or segmentation faults.
+
+.. seealso::
+
+    The file :file:`tests/test_pickling.cpp` contains a complete example
+    that demonstrates how to pickle and unpickle types using pybind11 in more
+    detail.
+
+.. [#f3] http://docs.python.org/3/library/pickle.html#pickling-class-instances
+
+Multiple Inheritance
+====================
+
+pybind11 can create bindings for types that derive from multiple base types
+(aka. *multiple inheritance*). To do so, specify all bases in the template
+arguments of the ``class_`` declaration:
+
+.. code-block:: cpp
+
+    py::class_<MyType, BaseType1, BaseType2, BaseType3>(m, "MyType")
+       ...
+
+The base types can be specified in arbitrary order, and they can even be
+interspersed with alias types and holder types (discussed earlier in this
+document)---pybind11 will automatically find out which is which. The only
+requirement is that the first template argument is the type to be declared.
+
+It is also permitted to inherit multiply from exported C++ classes in Python,
+as well as inheriting from multiple Python and/or pybind11-exported classes.
+
+There is one caveat regarding the implementation of this feature:
+
+When only one base type is specified for a C++ type that actually has multiple
+bases, pybind11 will assume that it does not participate in multiple
+inheritance, which can lead to undefined behavior. In such cases, add the tag
+``multiple_inheritance`` to the class constructor:
+
+.. code-block:: cpp
+
+    py::class_<MyType, BaseType2>(m, "MyType", py::multiple_inheritance());
+
+The tag is redundant and does not need to be specified when multiple base types
+are listed.
+
+.. _module_local:
+
+Module-local class bindings
+===========================
+
+When creating a binding for a class, pybind11 by default makes that binding
+"global" across modules.  What this means is that a type defined in one module
+can be returned from any module resulting in the same Python type.  For
+example, this allows the following:
+
+.. code-block:: cpp
+
+    // In the module1.cpp binding code for module1:
+    py::class_<Pet>(m, "Pet")
+        .def(py::init<std::string>())
+        .def_readonly("name", &Pet::name);
+
+.. code-block:: cpp
+
+    // In the module2.cpp binding code for module2:
+    m.def("create_pet", [](std::string name) { return new Pet(name); });
+
+.. code-block:: pycon
+
+    >>> from module1 import Pet
+    >>> from module2 import create_pet
+    >>> pet1 = Pet("Kitty")
+    >>> pet2 = create_pet("Doggy")
+    >>> pet2.name()
+    'Doggy'
+
+When writing binding code for a library, this is usually desirable: this
+allows, for example, splitting up a complex library into multiple Python
+modules.
+
+In some cases, however, this can cause conflicts.  For example, suppose two
+unrelated modules make use of an external C++ library and each provide custom
+bindings for one of that library's classes.  This will result in an error when
+a Python program attempts to import both modules (directly or indirectly)
+because of conflicting definitions on the external type:
+
+.. code-block:: cpp
+
+    // dogs.cpp
+
+    // Binding for external library class:
+    py::class<pets::Pet>(m, "Pet")
+        .def("name", &pets::Pet::name);
+
+    // Binding for local extension class:
+    py::class<Dog, pets::Pet>(m, "Dog")
+        .def(py::init<std::string>());
+
+.. code-block:: cpp
+
+    // cats.cpp, in a completely separate project from the above dogs.cpp.
+
+    // Binding for external library class:
+    py::class<pets::Pet>(m, "Pet")
+        .def("get_name", &pets::Pet::name);
+
+    // Binding for local extending class:
+    py::class<Cat, pets::Pet>(m, "Cat")
+        .def(py::init<std::string>());
+
+.. code-block:: pycon
+
+    >>> import cats
+    >>> import dogs
+    Traceback (most recent call last):
+      File "<stdin>", line 1, in <module>
+    ImportError: generic_type: type "Pet" is already registered!
+
+To get around this, you can tell pybind11 to keep the external class binding
+localized to the module by passing the ``py::module_local()`` attribute into
+the ``py::class_`` constructor:
+
+.. code-block:: cpp
+
+    // Pet binding in dogs.cpp:
+    py::class<pets::Pet>(m, "Pet", py::module_local())
+        .def("name", &pets::Pet::name);
+
+.. code-block:: cpp
+
+    // Pet binding in cats.cpp:
+    py::class<pets::Pet>(m, "Pet", py::module_local())
+        .def("get_name", &pets::Pet::name);
+
+This makes the Python-side ``dogs.Pet`` and ``cats.Pet`` into distinct classes,
+avoiding the conflict and allowing both modules to be loaded.  C++ code in the
+``dogs`` module that casts or returns a ``Pet`` instance will result in a
+``dogs.Pet`` Python instance, while C++ code in the ``cats`` module will result
+in a ``cats.Pet`` Python instance.
+
+This does come with two caveats, however: First, external modules cannot return
+or cast a ``Pet`` instance to Python (unless they also provide their own local
+bindings).  Second, from the Python point of view they are two distinct classes.
+
+Note that the locality only applies in the C++ -> Python direction.  When
+passing such a ``py::module_local`` type into a C++ function, the module-local
+classes are still considered.  This means that if the following function is
+added to any module (including but not limited to the ``cats`` and ``dogs``
+modules above) it will be callable with either a ``dogs.Pet`` or ``cats.Pet``
+argument:
+
+.. code-block:: cpp
+
+    m.def("pet_name", [](const pets::Pet &pet) { return pet.name(); });
+
+For example, suppose the above function is added to each of ``cats.cpp``,
+``dogs.cpp`` and ``frogs.cpp`` (where ``frogs.cpp`` is some other module that
+does *not* bind ``Pets`` at all).
+
+.. code-block:: pycon
+
+    >>> import cats, dogs, frogs  # No error because of the added py::module_local()
+    >>> mycat, mydog = cats.Cat("Fluffy"), dogs.Dog("Rover")
+    >>> (cats.pet_name(mycat), dogs.pet_name(mydog))
+    ('Fluffy', 'Rover')
+    >>> (cats.pet_name(mydog), dogs.pet_name(mycat), frogs.pet_name(mycat))
+    ('Rover', 'Fluffy', 'Fluffy')
+
+It is possible to use ``py::module_local()`` registrations in one module even
+if another module registers the same type globally: within the module with the
+module-local definition, all C++ instances will be cast to the associated bound
+Python type.  In other modules any such values are converted to the global
+Python type created elsewhere.
+
+.. note::
+
+    STL bindings (as provided via the optional :file:`pybind11/stl_bind.h`
+    header) apply ``py::module_local`` by default when the bound type might
+    conflict with other modules; see :ref:`stl_bind` for details.
+
+.. note::
+
+    The localization of the bound types is actually tied to the shared object
+    or binary generated by the compiler/linker.  For typical modules created
+    with ``PYBIND11_MODULE()``, this distinction is not significant.  It is
+    possible, however, when :ref:`embedding` to embed multiple modules in the
+    same binary (see :ref:`embedding_modules`).  In such a case, the
+    localization will apply across all embedded modules within the same binary.
+
+.. seealso::
+
+    The file :file:`tests/test_local_bindings.cpp` contains additional examples
+    that demonstrate how ``py::module_local()`` works.
+
+Binding protected member functions
+==================================
+
+It's normally not possible to expose ``protected`` member functions to Python:
+
+.. code-block:: cpp
+
+    class A {
+    protected:
+        int foo() const { return 42; }
+    };
+
+    py::class_<A>(m, "A")
+        .def("foo", &A::foo); // error: 'foo' is a protected member of 'A'
+
+On one hand, this is good because non-``public`` members aren't meant to be
+accessed from the outside. But we may want to make use of ``protected``
+functions in derived Python classes.
+
+The following pattern makes this possible:
+
+.. code-block:: cpp
+
+    class A {
+    protected:
+        int foo() const { return 42; }
+    };
+
+    class Publicist : public A { // helper type for exposing protected functions
+    public:
+        using A::foo; // inherited with different access modifier
+    };
+
+    py::class_<A>(m, "A") // bind the primary class
+        .def("foo", &Publicist::foo); // expose protected methods via the publicist
+
+This works because ``&Publicist::foo`` is exactly the same function as
+``&A::foo`` (same signature and address), just with a different access
+modifier. The only purpose of the ``Publicist`` helper class is to make
+the function name ``public``.
+
+If the intent is to expose ``protected`` ``virtual`` functions which can be
+overridden in Python, the publicist pattern can be combined with the previously
+described trampoline:
+
+.. code-block:: cpp
+
+    class A {
+    public:
+        virtual ~A() = default;
+
+    protected:
+        virtual int foo() const { return 42; }
+    };
+
+    class Trampoline : public A {
+    public:
+        int foo() const override { PYBIND11_OVERLOAD(int, A, foo, ); }
+    };
+
+    class Publicist : public A {
+    public:
+        using A::foo;
+    };
+
+    py::class_<A, Trampoline>(m, "A") // <-- `Trampoline` here
+        .def("foo", &Publicist::foo); // <-- `Publicist` here, not `Trampoline`!
+
+.. note::
+
+    MSVC 2015 has a compiler bug (fixed in version 2017) which
+    requires a more explicit function binding in the form of
+    ``.def("foo", static_cast<int (A::*)() const>(&Publicist::foo));``
+    where ``int (A::*)() const`` is the type of ``A::foo``.
+
+Custom automatic downcasters
+============================
+
+As explained in :ref:`inheritance`, pybind11 comes with built-in
+understanding of the dynamic type of polymorphic objects in C++; that
+is, returning a Pet to Python produces a Python object that knows it's
+wrapping a Dog, if Pet has virtual methods and pybind11 knows about
+Dog and this Pet is in fact a Dog. Sometimes, you might want to
+provide this automatic downcasting behavior when creating bindings for
+a class hierarchy that does not use standard C++ polymorphism, such as
+LLVM [#f4]_. As long as there's some way to determine at runtime
+whether a downcast is safe, you can proceed by specializing the
+``pybind11::polymorphic_type_hook`` template:
+
+.. code-block:: cpp
+
+    enum class PetKind { Cat, Dog, Zebra };
+    struct Pet {   // Not polymorphic: has no virtual methods
+        const PetKind kind;
+        int age = 0;
+      protected:
+        Pet(PetKind _kind) : kind(_kind) {}
+    };
+    struct Dog : Pet {
+        Dog() : Pet(PetKind::Dog) {}
+        std::string sound = "woof!";
+        std::string bark() const { return sound; }
+    };
+
+    namespace pybind11 {
+        template<> struct polymorphic_type_hook<Pet> {
+            static const void *get(const Pet *src, const std::type_info*& type) {
+                // note that src may be nullptr
+                if (src && src->kind == PetKind::Dog) {
+                    type = &typeid(Dog);
+                    return static_cast<const Dog*>(src);
+                }
+                return src;
+            }
+        };
+    } // namespace pybind11
+
+When pybind11 wants to convert a C++ pointer of type ``Base*`` to a
+Python object, it calls ``polymorphic_type_hook<Base>::get()`` to
+determine if a downcast is possible. The ``get()`` function should use
+whatever runtime information is available to determine if its ``src``
+parameter is in fact an instance of some class ``Derived`` that
+inherits from ``Base``. If it finds such a ``Derived``, it sets ``type
+= &typeid(Derived)`` and returns a pointer to the ``Derived`` object
+that contains ``src``. Otherwise, it just returns ``src``, leaving
+``type`` at its default value of nullptr. If you set ``type`` to a
+type that pybind11 doesn't know about, no downcasting will occur, and
+the original ``src`` pointer will be used with its static type
+``Base*``.
+
+It is critical that the returned pointer and ``type`` argument of
+``get()`` agree with each other: if ``type`` is set to something
+non-null, the returned pointer must point to the start of an object
+whose type is ``type``. If the hierarchy being exposed uses only
+single inheritance, a simple ``return src;`` will achieve this just
+fine, but in the general case, you must cast ``src`` to the
+appropriate derived-class pointer (e.g. using
+``static_cast<Derived>(src)``) before allowing it to be returned as a
+``void*``.
+
+.. [#f4] https://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html
+
+.. note::
+
+    pybind11's standard support for downcasting objects whose types
+    have virtual methods is implemented using
+    ``polymorphic_type_hook`` too, using the standard C++ ability to
+    determine the most-derived type of a polymorphic object using
+    ``typeid()`` and to cast a base pointer to that most-derived type
+    (even if you don't know what it is) using ``dynamic_cast<void*>``.
+
+.. seealso::
+
+    The file :file:`tests/test_tagbased_polymorphic.cpp` contains a
+    more complete example, including a demonstration of how to provide
+    automatic downcasting for an entire class hierarchy without
+    writing one get() function for each class.
diff --git a/3rdparty/pybind11/docs/advanced/embedding.rst b/3rdparty/pybind11/docs/advanced/embedding.rst
new file mode 100644
index 00000000..39303160
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/embedding.rst
@@ -0,0 +1,261 @@
+.. _embedding:
+
+Embedding the interpreter
+#########################
+
+While pybind11 is mainly focused on extending Python using C++, it's also
+possible to do the reverse: embed the Python interpreter into a C++ program.
+All of the other documentation pages still apply here, so refer to them for
+general pybind11 usage. This section will cover a few extra things required
+for embedding.
+
+Getting started
+===============
+
+A basic executable with an embedded interpreter can be created with just a few
+lines of CMake and the ``pybind11::embed`` target, as shown below. For more
+information, see :doc:`/compiling`.
+
+.. code-block:: cmake
+
+    cmake_minimum_required(VERSION 3.0)
+    project(example)
+
+    find_package(pybind11 REQUIRED)  # or `add_subdirectory(pybind11)`
+
+    add_executable(example main.cpp)
+    target_link_libraries(example PRIVATE pybind11::embed)
+
+The essential structure of the ``main.cpp`` file looks like this:
+
+.. code-block:: cpp
+
+    #include <pybind11/embed.h> // everything needed for embedding
+    namespace py = pybind11;
+
+    int main() {
+        py::scoped_interpreter guard{}; // start the interpreter and keep it alive
+
+        py::print("Hello, World!"); // use the Python API
+    }
+
+The interpreter must be initialized before using any Python API, which includes
+all the functions and classes in pybind11. The RAII guard class `scoped_interpreter`
+takes care of the interpreter lifetime. After the guard is destroyed, the interpreter
+shuts down and clears its memory. No Python functions can be called after this.
+
+Executing Python code
+=====================
+
+There are a few different ways to run Python code. One option is to use `eval`,
+`exec` or `eval_file`, as explained in :ref:`eval`. Here is a quick example in
+the context of an executable with an embedded interpreter:
+
+.. code-block:: cpp
+
+    #include <pybind11/embed.h>
+    namespace py = pybind11;
+
+    int main() {
+        py::scoped_interpreter guard{};
+
+        py::exec(R"(
+            kwargs = dict(name="World", number=42)
+            message = "Hello, {name}! The answer is {number}".format(**kwargs)
+            print(message)
+        )");
+    }
+
+Alternatively, similar results can be achieved using pybind11's API (see
+:doc:`/advanced/pycpp/index` for more details).
+
+.. code-block:: cpp
+
+    #include <pybind11/embed.h>
+    namespace py = pybind11;
+    using namespace py::literals;
+
+    int main() {
+        py::scoped_interpreter guard{};
+
+        auto kwargs = py::dict("name"_a="World", "number"_a=42);
+        auto message = "Hello, {name}! The answer is {number}"_s.format(**kwargs);
+        py::print(message);
+    }
+
+The two approaches can also be combined:
+
+.. code-block:: cpp
+
+    #include <pybind11/embed.h>
+    #include <iostream>
+
+    namespace py = pybind11;
+    using namespace py::literals;
+
+    int main() {
+        py::scoped_interpreter guard{};
+
+        auto locals = py::dict("name"_a="World", "number"_a=42);
+        py::exec(R"(
+            message = "Hello, {name}! The answer is {number}".format(**locals())
+        )", py::globals(), locals);
+
+        auto message = locals["message"].cast<std::string>();
+        std::cout << message;
+    }
+
+Importing modules
+=================
+
+Python modules can be imported using `module::import()`:
+
+.. code-block:: cpp
+
+    py::module sys = py::module::import("sys");
+    py::print(sys.attr("path"));
+
+For convenience, the current working directory is included in ``sys.path`` when
+embedding the interpreter. This makes it easy to import local Python files:
+
+.. code-block:: python
+
+    """calc.py located in the working directory"""
+
+    def add(i, j):
+        return i + j
+
+
+.. code-block:: cpp
+
+    py::module calc = py::module::import("calc");
+    py::object result = calc.attr("add")(1, 2);
+    int n = result.cast<int>();
+    assert(n == 3);
+
+Modules can be reloaded using `module::reload()` if the source is modified e.g.
+by an external process. This can be useful in scenarios where the application
+imports a user defined data processing script which needs to be updated after
+changes by the user. Note that this function does not reload modules recursively.
+
+.. _embedding_modules:
+
+Adding embedded modules
+=======================
+
+Embedded binary modules can be added using the `PYBIND11_EMBEDDED_MODULE` macro.
+Note that the definition must be placed at global scope. They can be imported
+like any other module.
+
+.. code-block:: cpp
+
+    #include <pybind11/embed.h>
+    namespace py = pybind11;
+
+    PYBIND11_EMBEDDED_MODULE(fast_calc, m) {
+        // `m` is a `py::module` which is used to bind functions and classes
+        m.def("add", [](int i, int j) {
+            return i + j;
+        });
+    }
+
+    int main() {
+        py::scoped_interpreter guard{};
+
+        auto fast_calc = py::module::import("fast_calc");
+        auto result = fast_calc.attr("add")(1, 2).cast<int>();
+        assert(result == 3);
+    }
+
+Unlike extension modules where only a single binary module can be created, on
+the embedded side an unlimited number of modules can be added using multiple
+`PYBIND11_EMBEDDED_MODULE` definitions (as long as they have unique names).
+
+These modules are added to Python's list of builtins, so they can also be
+imported in pure Python files loaded by the interpreter. Everything interacts
+naturally:
+
+.. code-block:: python
+
+    """py_module.py located in the working directory"""
+    import cpp_module
+
+    a = cpp_module.a
+    b = a + 1
+
+
+.. code-block:: cpp
+
+    #include <pybind11/embed.h>
+    namespace py = pybind11;
+
+    PYBIND11_EMBEDDED_MODULE(cpp_module, m) {
+        m.attr("a") = 1;
+    }
+
+    int main() {
+        py::scoped_interpreter guard{};
+
+        auto py_module = py::module::import("py_module");
+
+        auto locals = py::dict("fmt"_a="{} + {} = {}", **py_module.attr("__dict__"));
+        assert(locals["a"].cast<int>() == 1);
+        assert(locals["b"].cast<int>() == 2);
+
+        py::exec(R"(
+            c = a + b
+            message = fmt.format(a, b, c)
+        )", py::globals(), locals);
+
+        assert(locals["c"].cast<int>() == 3);
+        assert(locals["message"].cast<std::string>() == "1 + 2 = 3");
+    }
+
+
+Interpreter lifetime
+====================
+
+The Python interpreter shuts down when `scoped_interpreter` is destroyed. After
+this, creating a new instance will restart the interpreter. Alternatively, the
+`initialize_interpreter` / `finalize_interpreter` pair of functions can be used
+to directly set the state at any time.
+
+Modules created with pybind11 can be safely re-initialized after the interpreter
+has been restarted. However, this may not apply to third-party extension modules.
+The issue is that Python itself cannot completely unload extension modules and
+there are several caveats with regard to interpreter restarting. In short, not
+all memory may be freed, either due to Python reference cycles or user-created
+global data. All the details can be found in the CPython documentation.
+
+.. warning::
+
+    Creating two concurrent `scoped_interpreter` guards is a fatal error. So is
+    calling `initialize_interpreter` for a second time after the interpreter
+    has already been initialized.
+
+    Do not use the raw CPython API functions ``Py_Initialize`` and
+    ``Py_Finalize`` as these do not properly handle the lifetime of
+    pybind11's internal data.
+
+
+Sub-interpreter support
+=======================
+
+Creating multiple copies of `scoped_interpreter` is not possible because it
+represents the main Python interpreter. Sub-interpreters are something different
+and they do permit the existence of multiple interpreters. This is an advanced
+feature of the CPython API and should be handled with care. pybind11 does not
+currently offer a C++ interface for sub-interpreters, so refer to the CPython
+documentation for all the details regarding this feature.
+
+We'll just mention a couple of caveats the sub-interpreters support in pybind11:
+
+ 1. Sub-interpreters will not receive independent copies of embedded modules.
+    Instead, these are shared and modifications in one interpreter may be
+    reflected in another.
+
+ 2. Managing multiple threads, multiple interpreters and the GIL can be
+    challenging and there are several caveats here, even within the pure
+    CPython API (please refer to the Python docs for details). As for
+    pybind11, keep in mind that `gil_scoped_release` and `gil_scoped_acquire`
+    do not take sub-interpreters into account.
diff --git a/3rdparty/pybind11/docs/advanced/exceptions.rst b/3rdparty/pybind11/docs/advanced/exceptions.rst
new file mode 100644
index 00000000..75ad7f7f
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/exceptions.rst
@@ -0,0 +1,144 @@
+Exceptions
+##########
+
+Built-in exception translation
+==============================
+
+When C++ code invoked from Python throws an ``std::exception``, it is
+automatically converted into a Python ``Exception``. pybind11 defines multiple
+special exception classes that will map to different types of Python
+exceptions:
+
+.. tabularcolumns:: |p{0.5\textwidth}|p{0.45\textwidth}|
+
++--------------------------------------+--------------------------------------+
+|  C++ exception type                  |  Python exception type               |
++======================================+======================================+
+| :class:`std::exception`              | ``RuntimeError``                     |
++--------------------------------------+--------------------------------------+
+| :class:`std::bad_alloc`              | ``MemoryError``                      |
++--------------------------------------+--------------------------------------+
+| :class:`std::domain_error`           | ``ValueError``                       |
++--------------------------------------+--------------------------------------+
+| :class:`std::invalid_argument`       | ``ValueError``                       |
++--------------------------------------+--------------------------------------+
+| :class:`std::length_error`           | ``ValueError``                       |
++--------------------------------------+--------------------------------------+
+| :class:`std::out_of_range`           | ``IndexError``                       |
++--------------------------------------+--------------------------------------+
+| :class:`std::range_error`            | ``ValueError``                       |
++--------------------------------------+--------------------------------------+
+| :class:`std::overflow_error`         | ``OverflowError``                    |
++--------------------------------------+--------------------------------------+
+| :class:`pybind11::stop_iteration`    | ``StopIteration`` (used to implement |
+|                                      | custom iterators)                    |
++--------------------------------------+--------------------------------------+
+| :class:`pybind11::index_error`       | ``IndexError`` (used to indicate out |
+|                                      | of bounds access in ``__getitem__``, |
+|                                      | ``__setitem__``, etc.)               |
++--------------------------------------+--------------------------------------+
+| :class:`pybind11::value_error`       | ``ValueError`` (used to indicate     |
+|                                      | wrong value passed in                |
+|                                      | ``container.remove(...)``)           |
++--------------------------------------+--------------------------------------+
+| :class:`pybind11::key_error`         | ``KeyError`` (used to indicate out   |
+|                                      | of bounds access in ``__getitem__``, |
+|                                      | ``__setitem__`` in dict-like         |
+|                                      | objects, etc.)                       |
++--------------------------------------+--------------------------------------+
+| :class:`pybind11::error_already_set` | Indicates that the Python exception  |
+|                                      | flag has already been set via Python |
+|                                      | API calls from C++ code; this C++    |
+|                                      | exception is used to propagate such  |
+|                                      | a Python exception back to Python.   |
++--------------------------------------+--------------------------------------+
+
+When a Python function invoked from C++ throws an exception, it is converted
+into a C++ exception of type :class:`error_already_set` whose string payload
+contains a textual summary.
+
+There is also a special exception :class:`cast_error` that is thrown by
+:func:`handle::call` when the input arguments cannot be converted to Python
+objects.
+
+Registering custom translators
+==============================
+
+If the default exception conversion policy described above is insufficient,
+pybind11 also provides support for registering custom exception translators.
+To register a simple exception conversion that translates a C++ exception into
+a new Python exception using the C++ exception's ``what()`` method, a helper
+function is available:
+
+.. code-block:: cpp
+
+    py::register_exception<CppExp>(module, "PyExp");
+
+This call creates a Python exception class with the name ``PyExp`` in the given
+module and automatically converts any encountered exceptions of type ``CppExp``
+into Python exceptions of type ``PyExp``.
+
+When more advanced exception translation is needed, the function
+``py::register_exception_translator(translator)`` can be used to register
+functions that can translate arbitrary exception types (and which may include
+additional logic to do so).  The function takes a stateless callable (e.g.  a
+function pointer or a lambda function without captured variables) with the call
+signature ``void(std::exception_ptr)``.
+
+When a C++ exception is thrown, the registered exception translators are tried
+in reverse order of registration (i.e. the last registered translator gets the
+first shot at handling the exception).
+
+Inside the translator, ``std::rethrow_exception`` should be used within
+a try block to re-throw the exception.  One or more catch clauses to catch
+the appropriate exceptions should then be used with each clause using
+``PyErr_SetString`` to set a Python exception or ``ex(string)`` to set
+the python exception to a custom exception type (see below).
+
+To declare a custom Python exception type, declare a ``py::exception`` variable
+and use this in the associated exception translator (note: it is often useful
+to make this a static declaration when using it inside a lambda expression
+without requiring capturing).
+
+
+The following example demonstrates this for a hypothetical exception classes
+``MyCustomException`` and ``OtherException``: the first is translated to a
+custom python exception ``MyCustomError``, while the second is translated to a
+standard python RuntimeError:
+
+.. code-block:: cpp
+
+    static py::exception<MyCustomException> exc(m, "MyCustomError");
+    py::register_exception_translator([](std::exception_ptr p) {
+        try {
+            if (p) std::rethrow_exception(p);
+        } catch (const MyCustomException &e) {
+            exc(e.what());
+        } catch (const OtherException &e) {
+            PyErr_SetString(PyExc_RuntimeError, e.what());
+        }
+    });
+
+Multiple exceptions can be handled by a single translator, as shown in the
+example above. If the exception is not caught by the current translator, the
+previously registered one gets a chance.
+
+If none of the registered exception translators is able to handle the
+exception, it is handled by the default converter as described in the previous
+section.
+
+.. seealso::
+
+    The file :file:`tests/test_exceptions.cpp` contains examples
+    of various custom exception translators and custom exception types.
+
+.. note::
+
+    You must call either ``PyErr_SetString`` or a custom exception's call
+    operator (``exc(string)``) for every exception caught in a custom exception
+    translator.  Failure to do so will cause Python to crash with ``SystemError:
+    error return without exception set``.
+
+    Exceptions that you do not plan to handle should simply not be caught, or
+    may be explicitly (re-)thrown to delegate it to the other,
+    previously-declared existing exception translators.
diff --git a/3rdparty/pybind11/docs/advanced/functions.rst b/3rdparty/pybind11/docs/advanced/functions.rst
new file mode 100644
index 00000000..3e1a3ff0
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/functions.rst
@@ -0,0 +1,507 @@
+Functions
+#########
+
+Before proceeding with this section, make sure that you are already familiar
+with the basics of binding functions and classes, as explained in :doc:`/basics`
+and :doc:`/classes`. The following guide is applicable to both free and member
+functions, i.e. *methods* in Python.
+
+.. _return_value_policies:
+
+Return value policies
+=====================
+
+Python and C++ use fundamentally different ways of managing the memory and
+lifetime of objects managed by them. This can lead to issues when creating
+bindings for functions that return a non-trivial type. Just by looking at the
+type information, it is not clear whether Python should take charge of the
+returned value and eventually free its resources, or if this is handled on the
+C++ side. For this reason, pybind11 provides a several *return value policy*
+annotations that can be passed to the :func:`module::def` and
+:func:`class_::def` functions. The default policy is
+:enum:`return_value_policy::automatic`.
+
+Return value policies are tricky, and it's very important to get them right.
+Just to illustrate what can go wrong, consider the following simple example:
+
+.. code-block:: cpp
+
+    /* Function declaration */
+    Data *get_data() { return _data; /* (pointer to a static data structure) */ }
+    ...
+
+    /* Binding code */
+    m.def("get_data", &get_data); // <-- KABOOM, will cause crash when called from Python
+
+What's going on here? When ``get_data()`` is called from Python, the return
+value (a native C++ type) must be wrapped to turn it into a usable Python type.
+In this case, the default return value policy (:enum:`return_value_policy::automatic`)
+causes pybind11 to assume ownership of the static ``_data`` instance.
+
+When Python's garbage collector eventually deletes the Python
+wrapper, pybind11 will also attempt to delete the C++ instance (via ``operator
+delete()``) due to the implied ownership. At this point, the entire application
+will come crashing down, though errors could also be more subtle and involve
+silent data corruption.
+
+In the above example, the policy :enum:`return_value_policy::reference` should have
+been specified so that the global data instance is only *referenced* without any
+implied transfer of ownership, i.e.:
+
+.. code-block:: cpp
+
+    m.def("get_data", &get_data, return_value_policy::reference);
+
+On the other hand, this is not the right policy for many other situations,
+where ignoring ownership could lead to resource leaks.
+As a developer using pybind11, it's important to be familiar with the different
+return value policies, including which situation calls for which one of them.
+The following table provides an overview of available policies:
+
+.. tabularcolumns:: |p{0.5\textwidth}|p{0.45\textwidth}|
+
++--------------------------------------------------+----------------------------------------------------------------------------+
+| Return value policy                              | Description                                                                |
++==================================================+============================================================================+
+| :enum:`return_value_policy::take_ownership`      | Reference an existing object (i.e. do not create a new copy) and take      |
+|                                                  | ownership. Python will call the destructor and delete operator when the    |
+|                                                  | object's reference count reaches zero. Undefined behavior ensues when the  |
+|                                                  | C++ side does the same, or when the data was not dynamically allocated.    |
++--------------------------------------------------+----------------------------------------------------------------------------+
+| :enum:`return_value_policy::copy`                | Create a new copy of the returned object, which will be owned by Python.   |
+|                                                  | This policy is comparably safe because the lifetimes of the two instances  |
+|                                                  | are decoupled.                                                             |
++--------------------------------------------------+----------------------------------------------------------------------------+
+| :enum:`return_value_policy::move`                | Use ``std::move`` to move the return value contents into a new instance    |
+|                                                  | that will be owned by Python. This policy is comparably safe because the   |
+|                                                  | lifetimes of the two instances (move source and destination) are decoupled.|
++--------------------------------------------------+----------------------------------------------------------------------------+
+| :enum:`return_value_policy::reference`           | Reference an existing object, but do not take ownership. The C++ side is   |
+|                                                  | responsible for managing the object's lifetime and deallocating it when    |
+|                                                  | it is no longer used. Warning: undefined behavior will ensue when the C++  |
+|                                                  | side deletes an object that is still referenced and used by Python.        |
++--------------------------------------------------+----------------------------------------------------------------------------+
+| :enum:`return_value_policy::reference_internal`  | Indicates that the lifetime of the return value is tied to the lifetime    |
+|                                                  | of a parent object, namely the implicit ``this``, or ``self`` argument of  |
+|                                                  | the called method or property. Internally, this policy works just like     |
+|                                                  | :enum:`return_value_policy::reference` but additionally applies a          |
+|                                                  | ``keep_alive<0, 1>`` *call policy* (described in the next section) that    |
+|                                                  | prevents the parent object from being garbage collected as long as the     |
+|                                                  | return value is referenced by Python. This is the default policy for       |
+|                                                  | property getters created via ``def_property``, ``def_readwrite``, etc.     |
++--------------------------------------------------+----------------------------------------------------------------------------+
+| :enum:`return_value_policy::automatic`           | **Default policy.** This policy falls back to the policy                   |
+|                                                  | :enum:`return_value_policy::take_ownership` when the return value is a     |
+|                                                  | pointer. Otherwise, it uses :enum:`return_value_policy::move` or           |
+|                                                  | :enum:`return_value_policy::copy` for rvalue and lvalue references,        |
+|                                                  | respectively. See above for a description of what all of these different   |
+|                                                  | policies do.                                                               |
++--------------------------------------------------+----------------------------------------------------------------------------+
+| :enum:`return_value_policy::automatic_reference` | As above, but use policy :enum:`return_value_policy::reference` when the   |
+|                                                  | return value is a pointer. This is the default conversion policy for       |
+|                                                  | function arguments when calling Python functions manually from C++ code    |
+|                                                  | (i.e. via handle::operator()). You probably won't need to use this.        |
++--------------------------------------------------+----------------------------------------------------------------------------+
+
+Return value policies can also be applied to properties:
+
+.. code-block:: cpp
+
+    class_<MyClass>(m, "MyClass")
+        .def_property("data", &MyClass::getData, &MyClass::setData,
+                      py::return_value_policy::copy);
+
+Technically, the code above applies the policy to both the getter and the
+setter function, however, the setter doesn't really care about *return*
+value policies which makes this a convenient terse syntax. Alternatively,
+targeted arguments can be passed through the :class:`cpp_function` constructor:
+
+.. code-block:: cpp
+
+    class_<MyClass>(m, "MyClass")
+        .def_property("data"
+            py::cpp_function(&MyClass::getData, py::return_value_policy::copy),
+            py::cpp_function(&MyClass::setData)
+        );
+
+.. warning::
+
+    Code with invalid return value policies might access uninitialized memory or
+    free data structures multiple times, which can lead to hard-to-debug
+    non-determinism and segmentation faults, hence it is worth spending the
+    time to understand all the different options in the table above.
+
+.. note::
+
+    One important aspect of the above policies is that they only apply to
+    instances which pybind11 has *not* seen before, in which case the policy
+    clarifies essential questions about the return value's lifetime and
+    ownership.  When pybind11 knows the instance already (as identified by its
+    type and address in memory), it will return the existing Python object
+    wrapper rather than creating a new copy.
+
+.. note::
+
+    The next section on :ref:`call_policies` discusses *call policies* that can be
+    specified *in addition* to a return value policy from the list above. Call
+    policies indicate reference relationships that can involve both return values
+    and parameters of functions.
+
+.. note::
+
+   As an alternative to elaborate call policies and lifetime management logic,
+   consider using smart pointers (see the section on :ref:`smart_pointers` for
+   details). Smart pointers can tell whether an object is still referenced from
+   C++ or Python, which generally eliminates the kinds of inconsistencies that
+   can lead to crashes or undefined behavior. For functions returning smart
+   pointers, it is not necessary to specify a return value policy.
+
+.. _call_policies:
+
+Additional call policies
+========================
+
+In addition to the above return value policies, further *call policies* can be
+specified to indicate dependencies between parameters or ensure a certain state
+for the function call.
+
+Keep alive
+----------
+
+In general, this policy is required when the C++ object is any kind of container
+and another object is being added to the container. ``keep_alive<Nurse, Patient>``
+indicates that the argument with index ``Patient`` should be kept alive at least
+until the argument with index ``Nurse`` is freed by the garbage collector. Argument
+indices start at one, while zero refers to the return value. For methods, index
+``1`` refers to the implicit ``this`` pointer, while regular arguments begin at
+index ``2``. Arbitrarily many call policies can be specified. When a ``Nurse``
+with value ``None`` is detected at runtime, the call policy does nothing.
+
+When the nurse is not a pybind11-registered type, the implementation internally
+relies on the ability to create a *weak reference* to the nurse object. When
+the nurse object is not a pybind11-registered type and does not support weak
+references, an exception will be thrown.
+
+Consider the following example: here, the binding code for a list append
+operation ties the lifetime of the newly added element to the underlying
+container:
+
+.. code-block:: cpp
+
+    py::class_<List>(m, "List")
+        .def("append", &List::append, py::keep_alive<1, 2>());
+
+For consistency, the argument indexing is identical for constructors. Index
+``1`` still refers to the implicit ``this`` pointer, i.e. the object which is
+being constructed. Index ``0`` refers to the return type which is presumed to
+be ``void`` when a constructor is viewed like a function. The following example
+ties the lifetime of the constructor element to the constructed object:
+
+.. code-block:: cpp
+
+    py::class_<Nurse>(m, "Nurse")
+        .def(py::init<Patient &>(), py::keep_alive<1, 2>());
+
+.. note::
+
+    ``keep_alive`` is analogous to the ``with_custodian_and_ward`` (if Nurse,
+    Patient != 0) and ``with_custodian_and_ward_postcall`` (if Nurse/Patient ==
+    0) policies from Boost.Python.
+
+Call guard
+----------
+
+The ``call_guard<T>`` policy allows any scope guard type ``T`` to be placed
+around the function call. For example, this definition:
+
+.. code-block:: cpp
+
+    m.def("foo", foo, py::call_guard<T>());
+
+is equivalent to the following pseudocode:
+
+.. code-block:: cpp
+
+    m.def("foo", [](args...) {
+        T scope_guard;
+        return foo(args...); // forwarded arguments
+    });
+
+The only requirement is that ``T`` is default-constructible, but otherwise any
+scope guard will work. This is very useful in combination with `gil_scoped_release`.
+See :ref:`gil`.
+
+Multiple guards can also be specified as ``py::call_guard<T1, T2, T3...>``. The
+constructor order is left to right and destruction happens in reverse.
+
+.. seealso::
+
+    The file :file:`tests/test_call_policies.cpp` contains a complete example
+    that demonstrates using `keep_alive` and `call_guard` in more detail.
+
+.. _python_objects_as_args:
+
+Python objects as arguments
+===========================
+
+pybind11 exposes all major Python types using thin C++ wrapper classes. These
+wrapper classes can also be used as parameters of functions in bindings, which
+makes it possible to directly work with native Python types on the C++ side.
+For instance, the following statement iterates over a Python ``dict``:
+
+.. code-block:: cpp
+
+    void print_dict(py::dict dict) {
+        /* Easily interact with Python types */
+        for (auto item : dict)
+            std::cout << "key=" << std::string(py::str(item.first)) << ", "
+                      << "value=" << std::string(py::str(item.second)) << std::endl;
+    }
+
+It can be exported:
+
+.. code-block:: cpp
+
+    m.def("print_dict", &print_dict);
+
+And used in Python as usual:
+
+.. code-block:: pycon
+
+    >>> print_dict({'foo': 123, 'bar': 'hello'})
+    key=foo, value=123
+    key=bar, value=hello
+
+For more information on using Python objects in C++, see :doc:`/advanced/pycpp/index`.
+
+Accepting \*args and \*\*kwargs
+===============================
+
+Python provides a useful mechanism to define functions that accept arbitrary
+numbers of arguments and keyword arguments:
+
+.. code-block:: python
+
+   def generic(*args, **kwargs):
+       ...  # do something with args and kwargs
+
+Such functions can also be created using pybind11:
+
+.. code-block:: cpp
+
+   void generic(py::args args, py::kwargs kwargs) {
+       /// .. do something with args
+       if (kwargs)
+           /// .. do something with kwargs
+   }
+
+   /// Binding code
+   m.def("generic", &generic);
+
+The class ``py::args`` derives from ``py::tuple`` and ``py::kwargs`` derives
+from ``py::dict``.
+
+You may also use just one or the other, and may combine these with other
+arguments as long as the ``py::args`` and ``py::kwargs`` arguments are the last
+arguments accepted by the function.
+
+Please refer to the other examples for details on how to iterate over these,
+and on how to cast their entries into C++ objects. A demonstration is also
+available in ``tests/test_kwargs_and_defaults.cpp``.
+
+.. note::
+
+    When combining \*args or \*\*kwargs with :ref:`keyword_args` you should
+    *not* include ``py::arg`` tags for the ``py::args`` and ``py::kwargs``
+    arguments.
+
+Default arguments revisited
+===========================
+
+The section on :ref:`default_args` previously discussed basic usage of default
+arguments using pybind11. One noteworthy aspect of their implementation is that
+default arguments are converted to Python objects right at declaration time.
+Consider the following example:
+
+.. code-block:: cpp
+
+    py::class_<MyClass>("MyClass")
+        .def("myFunction", py::arg("arg") = SomeType(123));
+
+In this case, pybind11 must already be set up to deal with values of the type
+``SomeType`` (via a prior instantiation of ``py::class_<SomeType>``), or an
+exception will be thrown.
+
+Another aspect worth highlighting is that the "preview" of the default argument
+in the function signature is generated using the object's ``__repr__`` method.
+If not available, the signature may not be very helpful, e.g.:
+
+.. code-block:: pycon
+
+    FUNCTIONS
+    ...
+    |  myFunction(...)
+    |      Signature : (MyClass, arg : SomeType = <SomeType object at 0x101b7b080>) -> NoneType
+    ...
+
+The first way of addressing this is by defining ``SomeType.__repr__``.
+Alternatively, it is possible to specify the human-readable preview of the
+default argument manually using the ``arg_v`` notation:
+
+.. code-block:: cpp
+
+    py::class_<MyClass>("MyClass")
+        .def("myFunction", py::arg_v("arg", SomeType(123), "SomeType(123)"));
+
+Sometimes it may be necessary to pass a null pointer value as a default
+argument. In this case, remember to cast it to the underlying type in question,
+like so:
+
+.. code-block:: cpp
+
+    py::class_<MyClass>("MyClass")
+        .def("myFunction", py::arg("arg") = (SomeType *) nullptr);
+
+.. _nonconverting_arguments:
+
+Non-converting arguments
+========================
+
+Certain argument types may support conversion from one type to another.  Some
+examples of conversions are:
+
+* :ref:`implicit_conversions` declared using ``py::implicitly_convertible<A,B>()``
+* Calling a method accepting a double with an integer argument
+* Calling a ``std::complex<float>`` argument with a non-complex python type
+  (for example, with a float).  (Requires the optional ``pybind11/complex.h``
+  header).
+* Calling a function taking an Eigen matrix reference with a numpy array of the
+  wrong type or of an incompatible data layout.  (Requires the optional
+  ``pybind11/eigen.h`` header).
+
+This behaviour is sometimes undesirable: the binding code may prefer to raise
+an error rather than convert the argument.  This behaviour can be obtained
+through ``py::arg`` by calling the ``.noconvert()`` method of the ``py::arg``
+object, such as:
+
+.. code-block:: cpp
+
+    m.def("floats_only", [](double f) { return 0.5 * f; }, py::arg("f").noconvert());
+    m.def("floats_preferred", [](double f) { return 0.5 * f; }, py::arg("f"));
+
+Attempting the call the second function (the one without ``.noconvert()``) with
+an integer will succeed, but attempting to call the ``.noconvert()`` version
+will fail with a ``TypeError``:
+
+.. code-block:: pycon
+
+    >>> floats_preferred(4)
+    2.0
+    >>> floats_only(4)
+    Traceback (most recent call last):
+      File "<stdin>", line 1, in <module>
+    TypeError: floats_only(): incompatible function arguments. The following argument types are supported:
+        1. (f: float) -> float
+
+    Invoked with: 4
+
+You may, of course, combine this with the :var:`_a` shorthand notation (see
+:ref:`keyword_args`) and/or :ref:`default_args`.  It is also permitted to omit
+the argument name by using the ``py::arg()`` constructor without an argument
+name, i.e. by specifying ``py::arg().noconvert()``.
+
+.. note::
+
+    When specifying ``py::arg`` options it is necessary to provide the same
+    number of options as the bound function has arguments.  Thus if you want to
+    enable no-convert behaviour for just one of several arguments, you will
+    need to specify a ``py::arg()`` annotation for each argument with the
+    no-convert argument modified to ``py::arg().noconvert()``.
+
+.. _none_arguments:
+
+Allow/Prohibiting None arguments
+================================
+
+When a C++ type registered with :class:`py::class_` is passed as an argument to
+a function taking the instance as pointer or shared holder (e.g. ``shared_ptr``
+or a custom, copyable holder as described in :ref:`smart_pointers`), pybind
+allows ``None`` to be passed from Python which results in calling the C++
+function with ``nullptr`` (or an empty holder) for the argument.
+
+To explicitly enable or disable this behaviour, using the
+``.none`` method of the :class:`py::arg` object:
+
+.. code-block:: cpp
+
+    py::class_<Dog>(m, "Dog").def(py::init<>());
+    py::class_<Cat>(m, "Cat").def(py::init<>());
+    m.def("bark", [](Dog *dog) -> std::string {
+        if (dog) return "woof!"; /* Called with a Dog instance */
+        else return "(no dog)"; /* Called with None, dog == nullptr */
+    }, py::arg("dog").none(true));
+    m.def("meow", [](Cat *cat) -> std::string {
+        // Can't be called with None argument
+        return "meow";
+    }, py::arg("cat").none(false));
+
+With the above, the Python call ``bark(None)`` will return the string ``"(no
+dog)"``, while attempting to call ``meow(None)`` will raise a ``TypeError``:
+
+.. code-block:: pycon
+
+    >>> from animals import Dog, Cat, bark, meow
+    >>> bark(Dog())
+    'woof!'
+    >>> meow(Cat())
+    'meow'
+    >>> bark(None)
+    '(no dog)'
+    >>> meow(None)
+    Traceback (most recent call last):
+      File "<stdin>", line 1, in <module>
+    TypeError: meow(): incompatible function arguments. The following argument types are supported:
+        1. (cat: animals.Cat) -> str
+
+    Invoked with: None
+
+The default behaviour when the tag is unspecified is to allow ``None``.
+
+.. note::
+
+    Even when ``.none(true)`` is specified for an argument, ``None`` will be converted to a
+    ``nullptr`` *only* for custom and :ref:`opaque <opaque>` types. Pointers to built-in types
+    (``double *``, ``int *``, ...) and STL types (``std::vector<T> *``, ...; if ``pybind11/stl.h``
+    is included) are copied when converted to C++ (see :doc:`/advanced/cast/overview`) and will
+    not allow ``None`` as argument.  To pass optional argument of these copied types consider
+    using ``std::optional<T>``
+
+Overload resolution order
+=========================
+
+When a function or method with multiple overloads is called from Python,
+pybind11 determines which overload to call in two passes.  The first pass
+attempts to call each overload without allowing argument conversion (as if
+every argument had been specified as ``py::arg().noconvert()`` as described
+above).
+
+If no overload succeeds in the no-conversion first pass, a second pass is
+attempted in which argument conversion is allowed (except where prohibited via
+an explicit ``py::arg().noconvert()`` attribute in the function definition).
+
+If the second pass also fails a ``TypeError`` is raised.
+
+Within each pass, overloads are tried in the order they were registered with
+pybind11.
+
+What this means in practice is that pybind11 will prefer any overload that does
+not require conversion of arguments to an overload that does, but otherwise prefers
+earlier-defined overloads to later-defined ones.
+
+.. note::
+
+    pybind11 does *not* further prioritize based on the number/pattern of
+    overloaded arguments.  That is, pybind11 does not prioritize a function
+    requiring one conversion over one requiring three, but only prioritizes
+    overloads requiring no conversion at all to overloads that require
+    conversion of at least one argument.
diff --git a/3rdparty/pybind11/docs/advanced/misc.rst b/3rdparty/pybind11/docs/advanced/misc.rst
new file mode 100644
index 00000000..5b38ec75
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/misc.rst
@@ -0,0 +1,306 @@
+Miscellaneous
+#############
+
+.. _macro_notes:
+
+General notes regarding convenience macros
+==========================================
+
+pybind11 provides a few convenience macros such as
+:func:`PYBIND11_DECLARE_HOLDER_TYPE` and ``PYBIND11_OVERLOAD_*``. Since these
+are "just" macros that are evaluated in the preprocessor (which has no concept
+of types), they *will* get confused by commas in a template argument; for
+example, consider:
+
+.. code-block:: cpp
+
+    PYBIND11_OVERLOAD(MyReturnType<T1, T2>, Class<T3, T4>, func)
+
+The limitation of the C preprocessor interprets this as five arguments (with new
+arguments beginning after each comma) rather than three.  To get around this,
+there are two alternatives: you can use a type alias, or you can wrap the type
+using the ``PYBIND11_TYPE`` macro:
+
+.. code-block:: cpp
+
+    // Version 1: using a type alias
+    using ReturnType = MyReturnType<T1, T2>;
+    using ClassType = Class<T3, T4>;
+    PYBIND11_OVERLOAD(ReturnType, ClassType, func);
+
+    // Version 2: using the PYBIND11_TYPE macro:
+    PYBIND11_OVERLOAD(PYBIND11_TYPE(MyReturnType<T1, T2>),
+                      PYBIND11_TYPE(Class<T3, T4>), func)
+
+The ``PYBIND11_MAKE_OPAQUE`` macro does *not* require the above workarounds.
+
+.. _gil:
+
+Global Interpreter Lock (GIL)
+=============================
+
+When calling a C++ function from Python, the GIL is always held.
+The classes :class:`gil_scoped_release` and :class:`gil_scoped_acquire` can be
+used to acquire and release the global interpreter lock in the body of a C++
+function call. In this way, long-running C++ code can be parallelized using
+multiple Python threads. Taking :ref:`overriding_virtuals` as an example, this
+could be realized as follows (important changes highlighted):
+
+.. code-block:: cpp
+    :emphasize-lines: 8,9,31,32
+
+    class PyAnimal : public Animal {
+    public:
+        /* Inherit the constructors */
+        using Animal::Animal;
+
+        /* Trampoline (need one for each virtual function) */
+        std::string go(int n_times) {
+            /* Acquire GIL before calling Python code */
+            py::gil_scoped_acquire acquire;
+
+            PYBIND11_OVERLOAD_PURE(
+                std::string, /* Return type */
+                Animal,      /* Parent class */
+                go,          /* Name of function */
+                n_times      /* Argument(s) */
+            );
+        }
+    };
+
+    PYBIND11_MODULE(example, m) {
+        py::class_<Animal, PyAnimal> animal(m, "Animal");
+        animal
+            .def(py::init<>())
+            .def("go", &Animal::go);
+
+        py::class_<Dog>(m, "Dog", animal)
+            .def(py::init<>());
+
+        m.def("call_go", [](Animal *animal) -> std::string {
+            /* Release GIL before calling into (potentially long-running) C++ code */
+            py::gil_scoped_release release;
+            return call_go(animal);
+        });
+    }
+
+The ``call_go`` wrapper can also be simplified using the `call_guard` policy
+(see :ref:`call_policies`) which yields the same result:
+
+.. code-block:: cpp
+
+    m.def("call_go", &call_go, py::call_guard<py::gil_scoped_release>());
+
+
+Binding sequence data types, iterators, the slicing protocol, etc.
+==================================================================
+
+Please refer to the supplemental example for details.
+
+.. seealso::
+
+    The file :file:`tests/test_sequences_and_iterators.cpp` contains a
+    complete example that shows how to bind a sequence data type, including
+    length queries (``__len__``), iterators (``__iter__``), the slicing
+    protocol and other kinds of useful operations.
+
+
+Partitioning code over multiple extension modules
+=================================================
+
+It's straightforward to split binding code over multiple extension modules,
+while referencing types that are declared elsewhere. Everything "just" works
+without any special precautions. One exception to this rule occurs when
+extending a type declared in another extension module. Recall the basic example
+from Section :ref:`inheritance`.
+
+.. code-block:: cpp
+
+    py::class_<Pet> pet(m, "Pet");
+    pet.def(py::init<const std::string &>())
+       .def_readwrite("name", &Pet::name);
+
+    py::class_<Dog>(m, "Dog", pet /* <- specify parent */)
+        .def(py::init<const std::string &>())
+        .def("bark", &Dog::bark);
+
+Suppose now that ``Pet`` bindings are defined in a module named ``basic``,
+whereas the ``Dog`` bindings are defined somewhere else. The challenge is of
+course that the variable ``pet`` is not available anymore though it is needed
+to indicate the inheritance relationship to the constructor of ``class_<Dog>``.
+However, it can be acquired as follows:
+
+.. code-block:: cpp
+
+    py::object pet = (py::object) py::module::import("basic").attr("Pet");
+
+    py::class_<Dog>(m, "Dog", pet)
+        .def(py::init<const std::string &>())
+        .def("bark", &Dog::bark);
+
+Alternatively, you can specify the base class as a template parameter option to
+``class_``, which performs an automated lookup of the corresponding Python
+type. Like the above code, however, this also requires invoking the ``import``
+function once to ensure that the pybind11 binding code of the module ``basic``
+has been executed:
+
+.. code-block:: cpp
+
+    py::module::import("basic");
+
+    py::class_<Dog, Pet>(m, "Dog")
+        .def(py::init<const std::string &>())
+        .def("bark", &Dog::bark);
+
+Naturally, both methods will fail when there are cyclic dependencies.
+
+Note that pybind11 code compiled with hidden-by-default symbol visibility (e.g.
+via the command line flag ``-fvisibility=hidden`` on GCC/Clang), which is
+required for proper pybind11 functionality, can interfere with the ability to
+access types defined in another extension module.  Working around this requires
+manually exporting types that are accessed by multiple extension modules;
+pybind11 provides a macro to do just this:
+
+.. code-block:: cpp
+
+    class PYBIND11_EXPORT Dog : public Animal {
+        ...
+    };
+
+Note also that it is possible (although would rarely be required) to share arbitrary
+C++ objects between extension modules at runtime. Internal library data is shared
+between modules using capsule machinery [#f6]_ which can be also utilized for
+storing, modifying and accessing user-defined data. Note that an extension module
+will "see" other extensions' data if and only if they were built with the same
+pybind11 version. Consider the following example:
+
+.. code-block:: cpp
+
+    auto data = (MyData *) py::get_shared_data("mydata");
+    if (!data)
+        data = (MyData *) py::set_shared_data("mydata", new MyData(42));
+
+If the above snippet was used in several separately compiled extension modules,
+the first one to be imported would create a ``MyData`` instance and associate
+a ``"mydata"`` key with a pointer to it. Extensions that are imported later
+would be then able to access the data behind the same pointer.
+
+.. [#f6] https://docs.python.org/3/extending/extending.html#using-capsules
+
+Module Destructors
+==================
+
+pybind11 does not provide an explicit mechanism to invoke cleanup code at
+module destruction time. In rare cases where such functionality is required, it
+is possible to emulate it using Python capsules or weak references with a
+destruction callback.
+
+.. code-block:: cpp
+
+    auto cleanup_callback = []() {
+        // perform cleanup here -- this function is called with the GIL held
+    };
+
+    m.add_object("_cleanup", py::capsule(cleanup_callback));
+
+This approach has the potential downside that instances of classes exposed
+within the module may still be alive when the cleanup callback is invoked
+(whether this is acceptable will generally depend on the application).
+
+Alternatively, the capsule may also be stashed within a type object, which
+ensures that it not called before all instances of that type have been
+collected:
+
+.. code-block:: cpp
+
+    auto cleanup_callback = []() { /* ... */ };
+    m.attr("BaseClass").attr("_cleanup") = py::capsule(cleanup_callback);
+
+Both approaches also expose a potentially dangerous ``_cleanup`` attribute in
+Python, which may be undesirable from an API standpoint (a premature explicit
+call from Python might lead to undefined behavior). Yet another approach that 
+avoids this issue involves weak reference with a cleanup callback:
+
+.. code-block:: cpp
+
+    // Register a callback function that is invoked when the BaseClass object is colelcted
+    py::cpp_function cleanup_callback(
+        [](py::handle weakref) {
+            // perform cleanup here -- this function is called with the GIL held
+
+            weakref.dec_ref(); // release weak reference
+        }
+    );
+
+    // Create a weak reference with a cleanup callback and initially leak it
+    (void) py::weakref(m.attr("BaseClass"), cleanup_callback).release();
+
+.. note::
+
+    PyPy (at least version 5.9) does not garbage collect objects when the
+    interpreter exits. An alternative approach (which also works on CPython) is to use
+    the :py:mod:`atexit` module [#f7]_, for example:
+
+    .. code-block:: cpp
+
+        auto atexit = py::module::import("atexit");
+        atexit.attr("register")(py::cpp_function([]() {
+            // perform cleanup here -- this function is called with the GIL held
+        }));
+
+    .. [#f7] https://docs.python.org/3/library/atexit.html
+
+
+Generating documentation using Sphinx
+=====================================
+
+Sphinx [#f4]_ has the ability to inspect the signatures and documentation
+strings in pybind11-based extension modules to automatically generate beautiful
+documentation in a variety formats. The python_example repository [#f5]_ contains a
+simple example repository which uses this approach.
+
+There are two potential gotchas when using this approach: first, make sure that
+the resulting strings do not contain any :kbd:`TAB` characters, which break the
+docstring parsing routines. You may want to use C++11 raw string literals,
+which are convenient for multi-line comments. Conveniently, any excess
+indentation will be automatically be removed by Sphinx. However, for this to
+work, it is important that all lines are indented consistently, i.e.:
+
+.. code-block:: cpp
+
+    // ok
+    m.def("foo", &foo, R"mydelimiter(
+        The foo function
+
+        Parameters
+        ----------
+    )mydelimiter");
+
+    // *not ok*
+    m.def("foo", &foo, R"mydelimiter(The foo function
+
+        Parameters
+        ----------
+    )mydelimiter");
+
+By default, pybind11 automatically generates and prepends a signature to the docstring of a function 
+registered with ``module::def()`` and ``class_::def()``. Sometimes this
+behavior is not desirable, because you want to provide your own signature or remove 
+the docstring completely to exclude the function from the Sphinx documentation.
+The class ``options`` allows you to selectively suppress auto-generated signatures:
+
+.. code-block:: cpp
+
+    PYBIND11_MODULE(example, m) {
+        py::options options;
+        options.disable_function_signatures();
+
+        m.def("add", [](int a, int b) { return a + b; }, "A function which adds two numbers");
+    }
+
+Note that changes to the settings affect only function bindings created during the 
+lifetime of the ``options`` instance. When it goes out of scope at the end of the module's init function, 
+the default settings are restored to prevent unwanted side effects.
+
+.. [#f4] http://www.sphinx-doc.org
+.. [#f5] http://github.com/pybind/python_example
diff --git a/3rdparty/pybind11/docs/advanced/pycpp/index.rst b/3rdparty/pybind11/docs/advanced/pycpp/index.rst
new file mode 100644
index 00000000..6885bdcf
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/pycpp/index.rst
@@ -0,0 +1,13 @@
+Python C++ interface
+####################
+
+pybind11 exposes Python types and functions using thin C++ wrappers, which
+makes it possible to conveniently call Python code from C++ without resorting
+to Python's C API.
+
+.. toctree::
+   :maxdepth: 2
+
+   object
+   numpy
+   utilities
diff --git a/3rdparty/pybind11/docs/advanced/pycpp/numpy.rst b/3rdparty/pybind11/docs/advanced/pycpp/numpy.rst
new file mode 100644
index 00000000..458f99e9
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/pycpp/numpy.rst
@@ -0,0 +1,386 @@
+.. _numpy:
+
+NumPy
+#####
+
+Buffer protocol
+===============
+
+Python supports an extremely general and convenient approach for exchanging
+data between plugin libraries. Types can expose a buffer view [#f2]_, which
+provides fast direct access to the raw internal data representation. Suppose we
+want to bind the following simplistic Matrix class:
+
+.. code-block:: cpp
+
+    class Matrix {
+    public:
+        Matrix(size_t rows, size_t cols) : m_rows(rows), m_cols(cols) {
+            m_data = new float[rows*cols];
+        }
+        float *data() { return m_data; }
+        size_t rows() const { return m_rows; }
+        size_t cols() const { return m_cols; }
+    private:
+        size_t m_rows, m_cols;
+        float *m_data;
+    };
+
+The following binding code exposes the ``Matrix`` contents as a buffer object,
+making it possible to cast Matrices into NumPy arrays. It is even possible to
+completely avoid copy operations with Python expressions like
+``np.array(matrix_instance, copy = False)``.
+
+.. code-block:: cpp
+
+    py::class_<Matrix>(m, "Matrix", py::buffer_protocol())
+       .def_buffer([](Matrix &m) -> py::buffer_info {
+            return py::buffer_info(
+                m.data(),                               /* Pointer to buffer */
+                sizeof(float),                          /* Size of one scalar */
+                py::format_descriptor<float>::format(), /* Python struct-style format descriptor */
+                2,                                      /* Number of dimensions */
+                { m.rows(), m.cols() },                 /* Buffer dimensions */
+                { sizeof(float) * m.cols(),             /* Strides (in bytes) for each index */
+                  sizeof(float) }
+            );
+        });
+
+Supporting the buffer protocol in a new type involves specifying the special
+``py::buffer_protocol()`` tag in the ``py::class_`` constructor and calling the
+``def_buffer()`` method with a lambda function that creates a
+``py::buffer_info`` description record on demand describing a given matrix
+instance. The contents of ``py::buffer_info`` mirror the Python buffer protocol
+specification.
+
+.. code-block:: cpp
+
+    struct buffer_info {
+        void *ptr;
+        ssize_t itemsize;
+        std::string format;
+        ssize_t ndim;
+        std::vector<ssize_t> shape;
+        std::vector<ssize_t> strides;
+    };
+
+To create a C++ function that can take a Python buffer object as an argument,
+simply use the type ``py::buffer`` as one of its arguments. Buffers can exist
+in a great variety of configurations, hence some safety checks are usually
+necessary in the function body. Below, you can see an basic example on how to
+define a custom constructor for the Eigen double precision matrix
+(``Eigen::MatrixXd``) type, which supports initialization from compatible
+buffer objects (e.g. a NumPy matrix).
+
+.. code-block:: cpp
+
+    /* Bind MatrixXd (or some other Eigen type) to Python */
+    typedef Eigen::MatrixXd Matrix;
+
+    typedef Matrix::Scalar Scalar;
+    constexpr bool rowMajor = Matrix::Flags & Eigen::RowMajorBit;
+
+    py::class_<Matrix>(m, "Matrix", py::buffer_protocol())
+        .def("__init__", [](Matrix &m, py::buffer b) {
+            typedef Eigen::Stride<Eigen::Dynamic, Eigen::Dynamic> Strides;
+
+            /* Request a buffer descriptor from Python */
+            py::buffer_info info = b.request();
+
+            /* Some sanity checks ... */
+            if (info.format != py::format_descriptor<Scalar>::format())
+                throw std::runtime_error("Incompatible format: expected a double array!");
+
+            if (info.ndim != 2)
+                throw std::runtime_error("Incompatible buffer dimension!");
+
+            auto strides = Strides(
+                info.strides[rowMajor ? 0 : 1] / (py::ssize_t)sizeof(Scalar),
+                info.strides[rowMajor ? 1 : 0] / (py::ssize_t)sizeof(Scalar));
+
+            auto map = Eigen::Map<Matrix, 0, Strides>(
+                static_cast<Scalar *>(info.ptr), info.shape[0], info.shape[1], strides);
+
+            new (&m) Matrix(map);
+        });
+
+For reference, the ``def_buffer()`` call for this Eigen data type should look
+as follows:
+
+.. code-block:: cpp
+
+    .def_buffer([](Matrix &m) -> py::buffer_info {
+        return py::buffer_info(
+            m.data(),                                /* Pointer to buffer */
+            sizeof(Scalar),                          /* Size of one scalar */
+            py::format_descriptor<Scalar>::format(), /* Python struct-style format descriptor */
+            2,                                       /* Number of dimensions */
+            { m.rows(), m.cols() },                  /* Buffer dimensions */
+            { sizeof(Scalar) * (rowMajor ? m.cols() : 1),
+              sizeof(Scalar) * (rowMajor ? 1 : m.rows()) }
+                                                     /* Strides (in bytes) for each index */
+        );
+     })
+
+For a much easier approach of binding Eigen types (although with some
+limitations), refer to the section on :doc:`/advanced/cast/eigen`.
+
+.. seealso::
+
+    The file :file:`tests/test_buffers.cpp` contains a complete example
+    that demonstrates using the buffer protocol with pybind11 in more detail.
+
+.. [#f2] http://docs.python.org/3/c-api/buffer.html
+
+Arrays
+======
+
+By exchanging ``py::buffer`` with ``py::array`` in the above snippet, we can
+restrict the function so that it only accepts NumPy arrays (rather than any
+type of Python object satisfying the buffer protocol).
+
+In many situations, we want to define a function which only accepts a NumPy
+array of a certain data type. This is possible via the ``py::array_t<T>``
+template. For instance, the following function requires the argument to be a
+NumPy array containing double precision values.
+
+.. code-block:: cpp
+
+    void f(py::array_t<double> array);
+
+When it is invoked with a different type (e.g. an integer or a list of
+integers), the binding code will attempt to cast the input into a NumPy array
+of the requested type. Note that this feature requires the
+:file:`pybind11/numpy.h` header to be included.
+
+Data in NumPy arrays is not guaranteed to packed in a dense manner;
+furthermore, entries can be separated by arbitrary column and row strides.
+Sometimes, it can be useful to require a function to only accept dense arrays
+using either the C (row-major) or Fortran (column-major) ordering. This can be
+accomplished via a second template argument with values ``py::array::c_style``
+or ``py::array::f_style``.
+
+.. code-block:: cpp
+
+    void f(py::array_t<double, py::array::c_style | py::array::forcecast> array);
+
+The ``py::array::forcecast`` argument is the default value of the second
+template parameter, and it ensures that non-conforming arguments are converted
+into an array satisfying the specified requirements instead of trying the next
+function overload.
+
+Structured types
+================
+
+In order for ``py::array_t`` to work with structured (record) types, we first
+need to register the memory layout of the type. This can be done via
+``PYBIND11_NUMPY_DTYPE`` macro, called in the plugin definition code, which
+expects the type followed by field names:
+
+.. code-block:: cpp
+
+    struct A {
+        int x;
+        double y;
+    };
+
+    struct B {
+        int z;
+        A a;
+    };
+
+    // ...
+    PYBIND11_MODULE(test, m) {
+        // ...
+
+        PYBIND11_NUMPY_DTYPE(A, x, y);
+        PYBIND11_NUMPY_DTYPE(B, z, a);
+        /* now both A and B can be used as template arguments to py::array_t */
+    }
+
+The structure should consist of fundamental arithmetic types, ``std::complex``,
+previously registered substructures, and arrays of any of the above. Both C++
+arrays and ``std::array`` are supported. While there is a static assertion to
+prevent many types of unsupported structures, it is still the user's
+responsibility to use only "plain" structures that can be safely manipulated as
+raw memory without violating invariants.
+
+Vectorizing functions
+=====================
+
+Suppose we want to bind a function with the following signature to Python so
+that it can process arbitrary NumPy array arguments (vectors, matrices, general
+N-D arrays) in addition to its normal arguments:
+
+.. code-block:: cpp
+
+    double my_func(int x, float y, double z);
+
+After including the ``pybind11/numpy.h`` header, this is extremely simple:
+
+.. code-block:: cpp
+
+    m.def("vectorized_func", py::vectorize(my_func));
+
+Invoking the function like below causes 4 calls to be made to ``my_func`` with
+each of the array elements. The significant advantage of this compared to
+solutions like ``numpy.vectorize()`` is that the loop over the elements runs
+entirely on the C++ side and can be crunched down into a tight, optimized loop
+by the compiler. The result is returned as a NumPy array of type
+``numpy.dtype.float64``.
+
+.. code-block:: pycon
+
+    >>> x = np.array([[1, 3],[5, 7]])
+    >>> y = np.array([[2, 4],[6, 8]])
+    >>> z = 3
+    >>> result = vectorized_func(x, y, z)
+
+The scalar argument ``z`` is transparently replicated 4 times.  The input
+arrays ``x`` and ``y`` are automatically converted into the right types (they
+are of type  ``numpy.dtype.int64`` but need to be ``numpy.dtype.int32`` and
+``numpy.dtype.float32``, respectively).
+
+.. note::
+
+    Only arithmetic, complex, and POD types passed by value or by ``const &``
+    reference are vectorized; all other arguments are passed through as-is.
+    Functions taking rvalue reference arguments cannot be vectorized.
+
+In cases where the computation is too complicated to be reduced to
+``vectorize``, it will be necessary to create and access the buffer contents
+manually. The following snippet contains a complete example that shows how this
+works (the code is somewhat contrived, since it could have been done more
+simply using ``vectorize``).
+
+.. code-block:: cpp
+
+    #include <pybind11/pybind11.h>
+    #include <pybind11/numpy.h>
+
+    namespace py = pybind11;
+
+    py::array_t<double> add_arrays(py::array_t<double> input1, py::array_t<double> input2) {
+        py::buffer_info buf1 = input1.request(), buf2 = input2.request();
+
+        if (buf1.ndim != 1 || buf2.ndim != 1)
+            throw std::runtime_error("Number of dimensions must be one");
+
+        if (buf1.size != buf2.size)
+            throw std::runtime_error("Input shapes must match");
+
+        /* No pointer is passed, so NumPy will allocate the buffer */
+        auto result = py::array_t<double>(buf1.size);
+
+        py::buffer_info buf3 = result.request();
+
+        double *ptr1 = (double *) buf1.ptr,
+               *ptr2 = (double *) buf2.ptr,
+               *ptr3 = (double *) buf3.ptr;
+
+        for (size_t idx = 0; idx < buf1.shape[0]; idx++)
+            ptr3[idx] = ptr1[idx] + ptr2[idx];
+
+        return result;
+    }
+
+    PYBIND11_MODULE(test, m) {
+        m.def("add_arrays", &add_arrays, "Add two NumPy arrays");
+    }
+
+.. seealso::
+
+    The file :file:`tests/test_numpy_vectorize.cpp` contains a complete
+    example that demonstrates using :func:`vectorize` in more detail.
+
+Direct access
+=============
+
+For performance reasons, particularly when dealing with very large arrays, it
+is often desirable to directly access array elements without internal checking
+of dimensions and bounds on every access when indices are known to be already
+valid.  To avoid such checks, the ``array`` class and ``array_t<T>`` template
+class offer an unchecked proxy object that can be used for this unchecked
+access through the ``unchecked<N>`` and ``mutable_unchecked<N>`` methods,
+where ``N`` gives the required dimensionality of the array:
+
+.. code-block:: cpp
+
+    m.def("sum_3d", [](py::array_t<double> x) {
+        auto r = x.unchecked<3>(); // x must have ndim = 3; can be non-writeable
+        double sum = 0;
+        for (ssize_t i = 0; i < r.shape(0); i++)
+            for (ssize_t j = 0; j < r.shape(1); j++)
+                for (ssize_t k = 0; k < r.shape(2); k++)
+                    sum += r(i, j, k);
+        return sum;
+    });
+    m.def("increment_3d", [](py::array_t<double> x) {
+        auto r = x.mutable_unchecked<3>(); // Will throw if ndim != 3 or flags.writeable is false
+        for (ssize_t i = 0; i < r.shape(0); i++)
+            for (ssize_t j = 0; j < r.shape(1); j++)
+                for (ssize_t k = 0; k < r.shape(2); k++)
+                    r(i, j, k) += 1.0;
+    }, py::arg().noconvert());
+
+To obtain the proxy from an ``array`` object, you must specify both the data
+type and number of dimensions as template arguments, such as ``auto r =
+myarray.mutable_unchecked<float, 2>()``.
+
+If the number of dimensions is not known at compile time, you can omit the
+dimensions template parameter (i.e. calling ``arr_t.unchecked()`` or
+``arr.unchecked<T>()``.  This will give you a proxy object that works in the
+same way, but results in less optimizable code and thus a small efficiency
+loss in tight loops.
+
+Note that the returned proxy object directly references the array's data, and
+only reads its shape, strides, and writeable flag when constructed.  You must
+take care to ensure that the referenced array is not destroyed or reshaped for
+the duration of the returned object, typically by limiting the scope of the
+returned instance.
+
+The returned proxy object supports some of the same methods as ``py::array`` so
+that it can be used as a drop-in replacement for some existing, index-checked
+uses of ``py::array``:
+
+- ``r.ndim()`` returns the number of dimensions
+
+- ``r.data(1, 2, ...)`` and ``r.mutable_data(1, 2, ...)``` returns a pointer to
+  the ``const T`` or ``T`` data, respectively, at the given indices.  The
+  latter is only available to proxies obtained via ``a.mutable_unchecked()``.
+
+- ``itemsize()`` returns the size of an item in bytes, i.e. ``sizeof(T)``.
+
+- ``ndim()`` returns the number of dimensions.
+
+- ``shape(n)`` returns the size of dimension ``n``
+
+- ``size()`` returns the total number of elements (i.e. the product of the shapes).
+
+- ``nbytes()`` returns the number of bytes used by the referenced elements
+  (i.e. ``itemsize()`` times ``size()``).
+
+.. seealso::
+
+    The file :file:`tests/test_numpy_array.cpp` contains additional examples
+    demonstrating the use of this feature.
+
+Ellipsis
+========
+
+Python 3 provides a convenient ``...`` ellipsis notation that is often used to
+slice multidimensional arrays. For instance, the following snippet extracts the
+middle dimensions of a tensor with the first and last index set to zero.
+
+.. code-block:: python
+
+   a = # a NumPy array
+   b = a[0, ..., 0]
+
+The function ``py::ellipsis()`` function can be used to perform the same
+operation on the C++ side:
+
+.. code-block:: cpp
+
+   py::array a = /* A NumPy array */;
+   py::array b = a[py::make_tuple(0, py::ellipsis(), 0)];
diff --git a/3rdparty/pybind11/docs/advanced/pycpp/object.rst b/3rdparty/pybind11/docs/advanced/pycpp/object.rst
new file mode 100644
index 00000000..117131ed
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/pycpp/object.rst
@@ -0,0 +1,170 @@
+Python types
+############
+
+Available wrappers
+==================
+
+All major Python types are available as thin C++ wrapper classes. These
+can also be used as function parameters -- see :ref:`python_objects_as_args`.
+
+Available types include :class:`handle`, :class:`object`, :class:`bool_`,
+:class:`int_`, :class:`float_`, :class:`str`, :class:`bytes`, :class:`tuple`,
+:class:`list`, :class:`dict`, :class:`slice`, :class:`none`, :class:`capsule`,
+:class:`iterable`, :class:`iterator`, :class:`function`, :class:`buffer`,
+:class:`array`, and :class:`array_t`.
+
+Casting back and forth
+======================
+
+In this kind of mixed code, it is often necessary to convert arbitrary C++
+types to Python, which can be done using :func:`py::cast`:
+
+.. code-block:: cpp
+
+    MyClass *cls = ..;
+    py::object obj = py::cast(cls);
+
+The reverse direction uses the following syntax:
+
+.. code-block:: cpp
+
+    py::object obj = ...;
+    MyClass *cls = obj.cast<MyClass *>();
+
+When conversion fails, both directions throw the exception :class:`cast_error`.
+
+.. _python_libs:
+
+Accessing Python libraries from C++
+===================================
+
+It is also possible to import objects defined in the Python standard
+library or available in the current Python environment (``sys.path``) and work
+with these in C++.
+
+This example obtains a reference to the Python ``Decimal`` class.
+
+.. code-block:: cpp
+
+    // Equivalent to "from decimal import Decimal"
+    py::object Decimal = py::module::import("decimal").attr("Decimal");
+
+.. code-block:: cpp
+
+    // Try to import scipy
+    py::object scipy = py::module::import("scipy");
+    return scipy.attr("__version__");
+
+.. _calling_python_functions:
+
+Calling Python functions
+========================
+
+It is also possible to call Python classes, functions and methods 
+via ``operator()``.
+
+.. code-block:: cpp
+
+    // Construct a Python object of class Decimal
+    py::object pi = Decimal("3.14159");
+
+.. code-block:: cpp
+
+    // Use Python to make our directories
+    py::object os = py::module::import("os");
+    py::object makedirs = os.attr("makedirs");
+    makedirs("/tmp/path/to/somewhere");
+
+One can convert the result obtained from Python to a pure C++ version 
+if a ``py::class_`` or type conversion is defined.
+
+.. code-block:: cpp
+
+    py::function f = <...>;
+    py::object result_py = f(1234, "hello", some_instance);
+    MyClass &result = result_py.cast<MyClass>();
+
+.. _calling_python_methods:
+
+Calling Python methods
+========================
+
+To call an object's method, one can again use ``.attr`` to obtain access to the
+Python method.
+
+.. code-block:: cpp
+
+    // Calculate e^π in decimal
+    py::object exp_pi = pi.attr("exp")();
+    py::print(py::str(exp_pi));
+
+In the example above ``pi.attr("exp")`` is a *bound method*: it will always call
+the method for that same instance of the class. Alternately one can create an 
+*unbound method* via the Python class (instead of instance) and pass the ``self`` 
+object explicitly, followed by other arguments.
+
+.. code-block:: cpp
+
+    py::object decimal_exp = Decimal.attr("exp");
+
+    // Compute the e^n for n=0..4
+    for (int n = 0; n < 5; n++) {
+        py::print(decimal_exp(Decimal(n));
+    }
+
+Keyword arguments
+=================
+
+Keyword arguments are also supported. In Python, there is the usual call syntax:
+
+.. code-block:: python
+
+    def f(number, say, to):
+        ...  # function code
+
+    f(1234, say="hello", to=some_instance)  # keyword call in Python
+
+In C++, the same call can be made using:
+
+.. code-block:: cpp
+
+    using namespace pybind11::literals; // to bring in the `_a` literal
+    f(1234, "say"_a="hello", "to"_a=some_instance); // keyword call in C++
+
+Unpacking arguments
+===================
+
+Unpacking of ``*args`` and ``**kwargs`` is also possible and can be mixed with
+other arguments:
+
+.. code-block:: cpp
+
+    // * unpacking
+    py::tuple args = py::make_tuple(1234, "hello", some_instance);
+    f(*args);
+
+    // ** unpacking
+    py::dict kwargs = py::dict("number"_a=1234, "say"_a="hello", "to"_a=some_instance);
+    f(**kwargs);
+
+    // mixed keywords, * and ** unpacking
+    py::tuple args = py::make_tuple(1234);
+    py::dict kwargs = py::dict("to"_a=some_instance);
+    f(*args, "say"_a="hello", **kwargs);
+
+Generalized unpacking according to PEP448_ is also supported:
+
+.. code-block:: cpp
+
+    py::dict kwargs1 = py::dict("number"_a=1234);
+    py::dict kwargs2 = py::dict("to"_a=some_instance);
+    f(**kwargs1, "say"_a="hello", **kwargs2);
+
+.. seealso::
+
+    The file :file:`tests/test_pytypes.cpp` contains a complete
+    example that demonstrates passing native Python types in more detail. The
+    file :file:`tests/test_callbacks.cpp` presents a few examples of calling
+    Python functions from C++, including keywords arguments and unpacking.
+
+.. _PEP448: https://www.python.org/dev/peps/pep-0448/
diff --git a/3rdparty/pybind11/docs/advanced/pycpp/utilities.rst b/3rdparty/pybind11/docs/advanced/pycpp/utilities.rst
new file mode 100644
index 00000000..369e7c94
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/pycpp/utilities.rst
@@ -0,0 +1,144 @@
+Utilities
+#########
+
+Using Python's print function in C++
+====================================
+
+The usual way to write output in C++ is using ``std::cout`` while in Python one
+would use ``print``. Since these methods use different buffers, mixing them can
+lead to output order issues. To resolve this, pybind11 modules can use the
+:func:`py::print` function which writes to Python's ``sys.stdout`` for consistency.
+
+Python's ``print`` function is replicated in the C++ API including optional
+keyword arguments ``sep``, ``end``, ``file``, ``flush``. Everything works as
+expected in Python:
+
+.. code-block:: cpp
+
+    py::print(1, 2.0, "three"); // 1 2.0 three
+    py::print(1, 2.0, "three", "sep"_a="-"); // 1-2.0-three
+
+    auto args = py::make_tuple("unpacked", true);
+    py::print("->", *args, "end"_a="<-"); // -> unpacked True <-
+
+.. _ostream_redirect:
+
+Capturing standard output from ostream
+======================================
+
+Often, a library will use the streams ``std::cout`` and ``std::cerr`` to print,
+but this does not play well with Python's standard ``sys.stdout`` and ``sys.stderr``
+redirection. Replacing a library's printing with `py::print <print>` may not
+be feasible. This can be fixed using a guard around the library function that
+redirects output to the corresponding Python streams:
+
+.. code-block:: cpp
+
+    #include <pybind11/iostream.h>
+
+    ...
+
+    // Add a scoped redirect for your noisy code
+    m.def("noisy_func", []() {
+        py::scoped_ostream_redirect stream(
+            std::cout,                               // std::ostream&
+            py::module::import("sys").attr("stdout") // Python output
+        );
+        call_noisy_func();
+    });
+
+This method respects flushes on the output streams and will flush if needed
+when the scoped guard is destroyed. This allows the output to be redirected in
+real time, such as to a Jupyter notebook. The two arguments, the C++ stream and
+the Python output, are optional, and default to standard output if not given. An
+extra type, `py::scoped_estream_redirect <scoped_estream_redirect>`, is identical
+except for defaulting to ``std::cerr`` and ``sys.stderr``; this can be useful with
+`py::call_guard`, which allows multiple items, but uses the default constructor:
+
+.. code-block:: py
+
+    // Alternative: Call single function using call guard
+    m.def("noisy_func", &call_noisy_function,
+          py::call_guard<py::scoped_ostream_redirect,
+                         py::scoped_estream_redirect>());
+
+The redirection can also be done in Python with the addition of a context
+manager, using the `py::add_ostream_redirect() <add_ostream_redirect>` function:
+
+.. code-block:: cpp
+
+    py::add_ostream_redirect(m, "ostream_redirect");
+
+The name in Python defaults to ``ostream_redirect`` if no name is passed.  This
+creates the following context manager in Python:
+
+.. code-block:: python
+
+    with ostream_redirect(stdout=True, stderr=True):
+        noisy_function()
+
+It defaults to redirecting both streams, though you can use the keyword
+arguments to disable one of the streams if needed.
+
+.. note::
+
+    The above methods will not redirect C-level output to file descriptors, such
+    as ``fprintf``. For those cases, you'll need to redirect the file
+    descriptors either directly in C or with Python's ``os.dup2`` function
+    in an operating-system dependent way.
+
+.. _eval:
+
+Evaluating Python expressions from strings and files
+====================================================
+
+pybind11 provides the `eval`, `exec` and `eval_file` functions to evaluate
+Python expressions and statements. The following example illustrates how they
+can be used.
+
+.. code-block:: cpp
+
+    // At beginning of file
+    #include <pybind11/eval.h>
+
+    ...
+
+    // Evaluate in scope of main module
+    py::object scope = py::module::import("__main__").attr("__dict__");
+
+    // Evaluate an isolated expression
+    int result = py::eval("my_variable + 10", scope).cast<int>();
+
+    // Evaluate a sequence of statements
+    py::exec(
+        "print('Hello')\n"
+        "print('world!');",
+        scope);
+
+    // Evaluate the statements in an separate Python file on disk
+    py::eval_file("script.py", scope);
+
+C++11 raw string literals are also supported and quite handy for this purpose.
+The only requirement is that the first statement must be on a new line following
+the raw string delimiter ``R"(``, ensuring all lines have common leading indent:
+
+.. code-block:: cpp
+
+    py::exec(R"(
+        x = get_answer()
+        if x == 42:
+            print('Hello World!')
+        else:
+            print('Bye!')
+        )", scope
+    );
+
+.. note::
+
+    `eval` and `eval_file` accept a template parameter that describes how the
+    string/file should be interpreted. Possible choices include ``eval_expr``
+    (isolated expression), ``eval_single_statement`` (a single statement, return
+    value is always ``none``), and ``eval_statements`` (sequence of statements,
+    return value is always ``none``). `eval` defaults to  ``eval_expr``,
+    `eval_file` defaults to ``eval_statements`` and `exec` is just a shortcut
+    for ``eval<eval_statements>``.
diff --git a/3rdparty/pybind11/docs/advanced/smart_ptrs.rst b/3rdparty/pybind11/docs/advanced/smart_ptrs.rst
new file mode 100644
index 00000000..da57748c
--- /dev/null
+++ b/3rdparty/pybind11/docs/advanced/smart_ptrs.rst
@@ -0,0 +1,173 @@
+Smart pointers
+##############
+
+std::unique_ptr
+===============
+
+Given a class ``Example`` with Python bindings, it's possible to return
+instances wrapped in C++11 unique pointers, like so
+
+.. code-block:: cpp
+
+    std::unique_ptr<Example> create_example() { return std::unique_ptr<Example>(new Example()); }
+
+.. code-block:: cpp
+
+    m.def("create_example", &create_example);
+
+In other words, there is nothing special that needs to be done. While returning
+unique pointers in this way is allowed, it is *illegal* to use them as function
+arguments. For instance, the following function signature cannot be processed
+by pybind11.
+
+.. code-block:: cpp
+
+    void do_something_with_example(std::unique_ptr<Example> ex) { ... }
+
+The above signature would imply that Python needs to give up ownership of an
+object that is passed to this function, which is generally not possible (for
+instance, the object might be referenced elsewhere).
+
+std::shared_ptr
+===============
+
+The binding generator for classes, :class:`class_`, can be passed a template
+type that denotes a special *holder* type that is used to manage references to
+the object.  If no such holder type template argument is given, the default for
+a type named ``Type`` is ``std::unique_ptr<Type>``, which means that the object
+is deallocated when Python's reference count goes to zero.
+
+It is possible to switch to other types of reference counting wrappers or smart
+pointers, which is useful in codebases that rely on them. For instance, the
+following snippet causes ``std::shared_ptr`` to be used instead.
+
+.. code-block:: cpp
+
+    py::class_<Example, std::shared_ptr<Example> /* <- holder type */> obj(m, "Example");
+
+Note that any particular class can only be associated with a single holder type.
+
+One potential stumbling block when using holder types is that they need to be
+applied consistently. Can you guess what's broken about the following binding
+code?
+
+.. code-block:: cpp
+
+    class Child { };
+
+    class Parent {
+    public:
+       Parent() : child(std::make_shared<Child>()) { }
+       Child *get_child() { return child.get(); }  /* Hint: ** DON'T DO THIS ** */
+    private:
+        std::shared_ptr<Child> child;
+    };
+
+    PYBIND11_MODULE(example, m) {
+        py::class_<Child, std::shared_ptr<Child>>(m, "Child");
+
+        py::class_<Parent, std::shared_ptr<Parent>>(m, "Parent")
+           .def(py::init<>())
+           .def("get_child", &Parent::get_child);
+    }
+
+The following Python code will cause undefined behavior (and likely a
+segmentation fault).
+
+.. code-block:: python
+
+   from example import Parent
+   print(Parent().get_child())
+
+The problem is that ``Parent::get_child()`` returns a pointer to an instance of
+``Child``, but the fact that this instance is already managed by
+``std::shared_ptr<...>`` is lost when passing raw pointers. In this case,
+pybind11 will create a second independent ``std::shared_ptr<...>`` that also
+claims ownership of the pointer. In the end, the object will be freed **twice**
+since these shared pointers have no way of knowing about each other.
+
+There are two ways to resolve this issue:
+
+1. For types that are managed by a smart pointer class, never use raw pointers
+   in function arguments or return values. In other words: always consistently
+   wrap pointers into their designated holder types (such as
+   ``std::shared_ptr<...>``). In this case, the signature of ``get_child()``
+   should be modified as follows:
+
+.. code-block:: cpp
+
+    std::shared_ptr<Child> get_child() { return child; }
+
+2. Adjust the definition of ``Child`` by specifying
+   ``std::enable_shared_from_this<T>`` (see cppreference_ for details) as a
+   base class. This adds a small bit of information to ``Child`` that allows
+   pybind11 to realize that there is already an existing
+   ``std::shared_ptr<...>`` and communicate with it. In this case, the
+   declaration of ``Child`` should look as follows:
+
+.. _cppreference: http://en.cppreference.com/w/cpp/memory/enable_shared_from_this
+
+.. code-block:: cpp
+
+    class Child : public std::enable_shared_from_this<Child> { };
+
+.. _smart_pointers:
+
+Custom smart pointers
+=====================
+
+pybind11 supports ``std::unique_ptr`` and ``std::shared_ptr`` right out of the
+box. For any other custom smart pointer, transparent conversions can be enabled
+using a macro invocation similar to the following. It must be declared at the
+top namespace level before any binding code:
+
+.. code-block:: cpp
+
+    PYBIND11_DECLARE_HOLDER_TYPE(T, SmartPtr<T>);
+
+The first argument of :func:`PYBIND11_DECLARE_HOLDER_TYPE` should be a
+placeholder name that is used as a template parameter of the second argument.
+Thus, feel free to use any identifier, but use it consistently on both sides;
+also, don't use the name of a type that already exists in your codebase.
+
+The macro also accepts a third optional boolean parameter that is set to false
+by default. Specify
+
+.. code-block:: cpp
+
+    PYBIND11_DECLARE_HOLDER_TYPE(T, SmartPtr<T>, true);
+
+if ``SmartPtr<T>`` can always be initialized from a ``T*`` pointer without the
+risk of inconsistencies (such as multiple independent ``SmartPtr`` instances
+believing that they are the sole owner of the ``T*`` pointer). A common
+situation where ``true`` should be passed is when the ``T`` instances use
+*intrusive* reference counting.
+
+Please take a look at the :ref:`macro_notes` before using this feature.
+
+By default, pybind11 assumes that your custom smart pointer has a standard
+interface, i.e. provides a ``.get()`` member function to access the underlying
+raw pointer. If this is not the case, pybind11's ``holder_helper`` must be
+specialized:
+
+.. code-block:: cpp
+
+    // Always needed for custom holder types
+    PYBIND11_DECLARE_HOLDER_TYPE(T, SmartPtr<T>);
+
+    // Only needed if the type's `.get()` goes by another name
+    namespace pybind11 { namespace detail {
+        template <typename T>
+        struct holder_helper<SmartPtr<T>> { // <-- specialization
+            static const T *get(const SmartPtr<T> &p) { return p.getPointer(); }
+        };
+    }}
+
+The above specialization informs pybind11 that the custom ``SmartPtr`` class
+provides ``.get()`` functionality via ``.getPointer()``.
+
+.. seealso::
+
+    The file :file:`tests/test_smart_ptr.cpp` contains a complete example
+    that demonstrates how to work with custom reference-counting holder types
+    in more detail.
diff --git a/3rdparty/pybind11/docs/basics.rst b/3rdparty/pybind11/docs/basics.rst
new file mode 100644
index 00000000..7bf4d426
--- /dev/null
+++ b/3rdparty/pybind11/docs/basics.rst
@@ -0,0 +1,293 @@
+.. _basics:
+
+First steps
+###########
+
+This sections demonstrates the basic features of pybind11. Before getting
+started, make sure that development environment is set up to compile the
+included set of test cases.
+
+
+Compiling the test cases
+========================
+
+Linux/MacOS
+-----------
+
+On Linux  you'll need to install the **python-dev** or **python3-dev** packages as
+well as **cmake**. On Mac OS, the included python version works out of the box,
+but **cmake** must still be installed.
+
+After installing the prerequisites, run
+
+.. code-block:: bash
+
+   mkdir build
+   cd build
+   cmake ..
+   make check -j 4
+
+The last line will both compile and run the tests.
+
+Windows
+-------
+
+On Windows, only **Visual Studio 2015** and newer are supported since pybind11 relies
+on various C++11 language features that break older versions of Visual Studio.
+
+To compile and run the tests:
+
+.. code-block:: batch
+
+   mkdir build
+   cd build
+   cmake ..
+   cmake --build . --config Release --target check
+
+This will create a Visual Studio project, compile and run the target, all from the
+command line.
+
+.. Note::
+
+    If all tests fail, make sure that the Python binary and the testcases are compiled
+    for the same processor type and bitness (i.e. either **i386** or **x86_64**). You
+    can specify **x86_64** as the target architecture for the generated Visual Studio
+    project using ``cmake -A x64 ..``.
+
+.. seealso::
+
+    Advanced users who are already familiar with Boost.Python may want to skip
+    the tutorial and look at the test cases in the :file:`tests` directory,
+    which exercise all features of pybind11.
+
+Header and namespace conventions
+================================
+
+For brevity, all code examples assume that the following two lines are present:
+
+.. code-block:: cpp
+
+    #include <pybind11/pybind11.h>
+
+    namespace py = pybind11;
+
+Some features may require additional headers, but those will be specified as needed.
+
+.. _simple_example:
+
+Creating bindings for a simple function
+=======================================
+
+Let's start by creating Python bindings for an extremely simple function, which
+adds two numbers and returns their result:
+
+.. code-block:: cpp
+
+    int add(int i, int j) {
+        return i + j;
+    }
+
+For simplicity [#f1]_, we'll put both this function and the binding code into
+a file named :file:`example.cpp` with the following contents:
+
+.. code-block:: cpp
+
+    #include <pybind11/pybind11.h>
+
+    int add(int i, int j) {
+        return i + j;
+    }
+
+    PYBIND11_MODULE(example, m) {
+        m.doc() = "pybind11 example plugin"; // optional module docstring
+
+        m.def("add", &add, "A function which adds two numbers");
+    }
+
+.. [#f1] In practice, implementation and binding code will generally be located
+         in separate files.
+
+The :func:`PYBIND11_MODULE` macro creates a function that will be called when an
+``import`` statement is issued from within Python. The module name (``example``)
+is given as the first macro argument (it should not be in quotes). The second
+argument (``m``) defines a variable of type :class:`py::module <module>` which
+is the main interface for creating bindings. The method :func:`module::def`
+generates binding code that exposes the ``add()`` function to Python.
+
+.. note::
+
+    Notice how little code was needed to expose our function to Python: all
+    details regarding the function's parameters and return value were
+    automatically inferred using template metaprogramming. This overall
+    approach and the used syntax are borrowed from Boost.Python, though the
+    underlying implementation is very different.
+
+pybind11 is a header-only library, hence it is not necessary to link against
+any special libraries and there are no intermediate (magic) translation steps.
+On Linux, the above example can be compiled using the following command:
+
+.. code-block:: bash
+
+    $ c++ -O3 -Wall -shared -std=c++11 -fPIC `python3 -m pybind11 --includes` example.cpp -o example`python3-config --extension-suffix`
+
+For more details on the required compiler flags on Linux and MacOS, see
+:ref:`building_manually`. For complete cross-platform compilation instructions,
+refer to the :ref:`compiling` page.
+
+The `python_example`_ and `cmake_example`_ repositories are also a good place
+to start. They are both complete project examples with cross-platform build
+systems. The only difference between the two is that `python_example`_ uses
+Python's ``setuptools`` to build the module, while `cmake_example`_ uses CMake
+(which may be preferable for existing C++ projects).
+
+.. _python_example: https://github.com/pybind/python_example
+.. _cmake_example: https://github.com/pybind/cmake_example
+
+Building the above C++ code will produce a binary module file that can be
+imported to Python. Assuming that the compiled module is located in the
+current directory, the following interactive Python session shows how to
+load and execute the example:
+
+.. code-block:: pycon
+
+    $ python
+    Python 2.7.10 (default, Aug 22 2015, 20:33:39)
+    [GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.1)] on darwin
+    Type "help", "copyright", "credits" or "license" for more information.
+    >>> import example
+    >>> example.add(1, 2)
+    3L
+    >>>
+
+.. _keyword_args:
+
+Keyword arguments
+=================
+
+With a simple code modification, it is possible to inform Python about the
+names of the arguments ("i" and "j" in this case).
+
+.. code-block:: cpp
+
+    m.def("add", &add, "A function which adds two numbers",
+          py::arg("i"), py::arg("j"));
+
+:class:`arg` is one of several special tag classes which can be used to pass
+metadata into :func:`module::def`. With this modified binding code, we can now
+call the function using keyword arguments, which is a more readable alternative
+particularly for functions taking many parameters:
+
+.. code-block:: pycon
+
+    >>> import example
+    >>> example.add(i=1, j=2)
+    3L
+
+The keyword names also appear in the function signatures within the documentation.
+
+.. code-block:: pycon
+
+    >>> help(example)
+
+    ....
+
+    FUNCTIONS
+        add(...)
+            Signature : (i: int, j: int) -> int
+
+            A function which adds two numbers
+
+A shorter notation for named arguments is also available:
+
+.. code-block:: cpp
+
+    // regular notation
+    m.def("add1", &add, py::arg("i"), py::arg("j"));
+    // shorthand
+    using namespace pybind11::literals;
+    m.def("add2", &add, "i"_a, "j"_a);
+
+The :var:`_a` suffix forms a C++11 literal which is equivalent to :class:`arg`.
+Note that the literal operator must first be made visible with the directive
+``using namespace pybind11::literals``. This does not bring in anything else
+from the ``pybind11`` namespace except for literals.
+
+.. _default_args:
+
+Default arguments
+=================
+
+Suppose now that the function to be bound has default arguments, e.g.:
+
+.. code-block:: cpp
+
+    int add(int i = 1, int j = 2) {
+        return i + j;
+    }
+
+Unfortunately, pybind11 cannot automatically extract these parameters, since they
+are not part of the function's type information. However, they are simple to specify
+using an extension of :class:`arg`:
+
+.. code-block:: cpp
+
+    m.def("add", &add, "A function which adds two numbers",
+          py::arg("i") = 1, py::arg("j") = 2);
+
+The default values also appear within the documentation.
+
+.. code-block:: pycon
+
+    >>> help(example)
+
+    ....
+
+    FUNCTIONS
+        add(...)
+            Signature : (i: int = 1, j: int = 2) -> int
+
+            A function which adds two numbers
+
+The shorthand notation is also available for default arguments:
+
+.. code-block:: cpp
+
+    // regular notation
+    m.def("add1", &add, py::arg("i") = 1, py::arg("j") = 2);
+    // shorthand
+    m.def("add2", &add, "i"_a=1, "j"_a=2);
+
+Exporting variables
+===================
+
+To expose a value from C++, use the ``attr`` function to register it in a
+module as shown below. Built-in types and general objects (more on that later)
+are automatically converted when assigned as attributes, and can be explicitly
+converted using the function ``py::cast``.
+
+.. code-block:: cpp
+
+    PYBIND11_MODULE(example, m) {
+        m.attr("the_answer") = 42;
+        py::object world = py::cast("World");
+        m.attr("what") = world;
+    }
+
+These are then accessible from Python:
+
+.. code-block:: pycon
+
+    >>> import example
+    >>> example.the_answer
+    42
+    >>> example.what
+    'World'
+
+.. _supported_types:
+
+Supported data types
+====================
+
+A large number of data types are supported out of the box and can be used
+seamlessly as functions arguments, return values or with ``py::cast`` in general.
+For a full overview, see the :doc:`advanced/cast/index` section.
diff --git a/3rdparty/pybind11/docs/benchmark.py b/3rdparty/pybind11/docs/benchmark.py
new file mode 100644
index 00000000..6dc0604e
--- /dev/null
+++ b/3rdparty/pybind11/docs/benchmark.py
@@ -0,0 +1,88 @@
+import random
+import os
+import time
+import datetime as dt
+
+nfns = 4  # Functions per class
+nargs = 4  # Arguments per function
+
+
+def generate_dummy_code_pybind11(nclasses=10):
+    decl = ""
+    bindings = ""
+
+    for cl in range(nclasses):
+        decl += "class cl%03i;\n" % cl
+    decl += '\n'
+
+    for cl in range(nclasses):
+        decl += "class cl%03i {\n" % cl
+        decl += "public:\n"
+        bindings += '    py::class_<cl%03i>(m, "cl%03i")\n' % (cl, cl)
+        for fn in range(nfns):
+            ret = random.randint(0, nclasses - 1)
+            params  = [random.randint(0, nclasses - 1) for i in range(nargs)]
+            decl += "    cl%03i *fn_%03i(" % (ret, fn)
+            decl += ", ".join("cl%03i *" % p for p in params)
+            decl += ");\n"
+            bindings += '        .def("fn_%03i", &cl%03i::fn_%03i)\n' % \
+                (fn, cl, fn)
+        decl += "};\n\n"
+        bindings += '        ;\n'
+
+    result = "#include <pybind11/pybind11.h>\n\n"
+    result += "namespace py = pybind11;\n\n"
+    result += decl + '\n'
+    result += "PYBIND11_MODULE(example, m) {\n"
+    result += bindings
+    result += "}"
+    return result
+
+
+def generate_dummy_code_boost(nclasses=10):
+    decl = ""
+    bindings = ""
+
+    for cl in range(nclasses):
+        decl += "class cl%03i;\n" % cl
+    decl += '\n'
+
+    for cl in range(nclasses):
+        decl += "class cl%03i {\n" % cl
+        decl += "public:\n"
+        bindings += '    py::class_<cl%03i>("cl%03i")\n' % (cl, cl)
+        for fn in range(nfns):
+            ret = random.randint(0, nclasses - 1)
+            params  = [random.randint(0, nclasses - 1) for i in range(nargs)]
+            decl += "    cl%03i *fn_%03i(" % (ret, fn)
+            decl += ", ".join("cl%03i *" % p for p in params)
+            decl += ");\n"
+            bindings += '        .def("fn_%03i", &cl%03i::fn_%03i, py::return_value_policy<py::manage_new_object>())\n' % \
+                (fn, cl, fn)
+        decl += "};\n\n"
+        bindings += '        ;\n'
+
+    result = "#include <boost/python.hpp>\n\n"
+    result += "namespace py = boost::python;\n\n"
+    result += decl + '\n'
+    result += "BOOST_PYTHON_MODULE(example) {\n"
+    result += bindings
+    result += "}"
+    return result
+
+
+for codegen in [generate_dummy_code_pybind11, generate_dummy_code_boost]:
+    print ("{")
+    for i in range(0, 10):
+        nclasses = 2 ** i
+        with open("test.cpp", "w") as f:
+            f.write(codegen(nclasses))
+        n1 = dt.datetime.now()
+        os.system("g++ -Os -shared -rdynamic -undefined dynamic_lookup "
+            "-fvisibility=hidden -std=c++14 test.cpp -I include "
+            "-I /System/Library/Frameworks/Python.framework/Headers -o test.so")
+        n2 = dt.datetime.now()
+        elapsed = (n2 - n1).total_seconds()
+        size = os.stat('test.so').st_size
+        print("   {%i, %f, %i}," % (nclasses * nfns, elapsed, size))
+    print ("}")
diff --git a/3rdparty/pybind11/docs/benchmark.rst b/3rdparty/pybind11/docs/benchmark.rst
new file mode 100644
index 00000000..59d533df
--- /dev/null
+++ b/3rdparty/pybind11/docs/benchmark.rst
@@ -0,0 +1,97 @@
+Benchmark
+=========
+
+The following is the result of a synthetic benchmark comparing both compilation
+time and module size of pybind11 against Boost.Python. A detailed report about a
+Boost.Python to pybind11 conversion of a real project is available here: [#f1]_.
+
+.. [#f1] http://graylab.jhu.edu/RosettaCon2016/PyRosetta-4.pdf
+
+Setup
+-----
+
+A python script (see the ``docs/benchmark.py`` file) was used to generate a set
+of files with dummy classes whose count increases for each successive benchmark
+(between 1 and 2048 classes in powers of two). Each class has four methods with
+a randomly generated signature with a return value and four arguments. (There
+was no particular reason for this setup other than the desire to generate many
+unique function signatures whose count could be controlled in a simple way.)
+
+Here is an example of the binding code for one class:
+
+.. code-block:: cpp
+
+    ...
+    class cl034 {
+    public:
+        cl279 *fn_000(cl084 *, cl057 *, cl065 *, cl042 *);
+        cl025 *fn_001(cl098 *, cl262 *, cl414 *, cl121 *);
+        cl085 *fn_002(cl445 *, cl297 *, cl145 *, cl421 *);
+        cl470 *fn_003(cl200 *, cl323 *, cl332 *, cl492 *);
+    };
+    ...
+
+    PYBIND11_MODULE(example, m) {
+        ...
+        py::class_<cl034>(m, "cl034")
+            .def("fn_000", &cl034::fn_000)
+            .def("fn_001", &cl034::fn_001)
+            .def("fn_002", &cl034::fn_002)
+            .def("fn_003", &cl034::fn_003)
+        ...
+    }
+
+The Boost.Python version looks almost identical except that a return value
+policy had to be specified as an argument to ``def()``. For both libraries,
+compilation was done with
+
+.. code-block:: bash
+
+    Apple LLVM version 7.0.2 (clang-700.1.81)
+
+and the following compilation flags
+
+.. code-block:: bash
+
+    g++ -Os -shared -rdynamic -undefined dynamic_lookup -fvisibility=hidden -std=c++14
+
+Compilation time
+----------------
+
+The following log-log plot shows how the compilation time grows for an
+increasing number of class and function declarations. pybind11 includes many
+fewer headers, which initially leads to shorter compilation times, but the
+performance is ultimately fairly similar (pybind11 is 19.8 seconds faster for
+the largest largest file with 2048 classes and a total of 8192 methods -- a
+modest **1.2x** speedup relative to Boost.Python, which required 116.35
+seconds).
+
+.. only:: not latex
+
+    .. image:: pybind11_vs_boost_python1.svg
+
+.. only:: latex
+
+    .. image:: pybind11_vs_boost_python1.png
+
+Module size
+-----------
+
+Differences between the two libraries become much more pronounced when
+considering the file size of the generated Python plugin: for the largest file,
+the binary generated by Boost.Python required 16.8 MiB, which was **2.17
+times** / **9.1 megabytes** larger than the output generated by pybind11. For
+very small inputs, Boost.Python has an edge in the plot below -- however, note
+that it stores many definitions in an external library, whose size was not
+included here, hence the comparison is slightly shifted in Boost.Python's
+favor.
+
+.. only:: not latex
+
+    .. image:: pybind11_vs_boost_python2.svg
+
+.. only:: latex
+
+    .. image:: pybind11_vs_boost_python2.png
+
+
diff --git a/3rdparty/pybind11/docs/changelog.rst b/3rdparty/pybind11/docs/changelog.rst
new file mode 100644
index 00000000..2def2b07
--- /dev/null
+++ b/3rdparty/pybind11/docs/changelog.rst
@@ -0,0 +1,1277 @@
+.. _changelog:
+
+Changelog
+#########
+
+Starting with version 1.8.0, pybind11 releases use a `semantic versioning
+<http://semver.org>`_ policy.
+
+v2.5.0 (Mar 31, 2020)
+-----------------------------------------------------
+
+* Use C++17 fold expressions in type casters, if available. This can
+  improve performance during overload resolution when functions have
+  multiple arguments.
+  `#2043 <https://github.com/pybind/pybind11/pull/2043>`_.
+
+* Changed include directory resolution in ``pybind11/__init__.py``
+  and installation in ``setup.py``. This fixes a number of open issues
+  where pybind11 headers could not be found in certain environments.
+  `#1995 <https://github.com/pybind/pybind11/pull/1995>`_.
+
+* C++20 ``char8_t`` and ``u8string`` support. `#2026
+  <https://github.com/pybind/pybind11/pull/2026>`_.
+
+* CMake: search for Python 3.9. `bb9c91
+  <https://github.com/pybind/pybind11/commit/bb9c91>`_.
+
+* Fixes for MSYS-based build environments.
+  `#2087 <https://github.com/pybind/pybind11/pull/2087>`_,
+  `#2053 <https://github.com/pybind/pybind11/pull/2053>`_.
+
+* STL bindings for ``std::vector<...>::clear``. `#2074
+  <https://github.com/pybind/pybind11/pull/2074>`_.
+
+* Read-only flag for ``py::buffer``. `#1466
+  <https://github.com/pybind/pybind11/pull/1466>`_.
+
+* Exception handling during module initialization.
+  `bf2b031 <https://github.com/pybind/pybind11/commit/bf2b031>`_.
+
+* Support linking against a CPython debug build.
+  `#2025 <https://github.com/pybind/pybind11/pull/2025>`_.
+
+* Fixed issues involving the availability and use of aligned ``new`` and
+  ``delete``. `#1988 <https://github.com/pybind/pybind11/pull/1988>`_,
+  `759221 <https://github.com/pybind/pybind11/commit/759221>`_.
+
+* Fixed a resource leak upon interpreter shutdown.
+  `#2020 <https://github.com/pybind/pybind11/pull/2020>`_.
+
+* Fixed error handling in the boolean caster.
+  `#1976 <https://github.com/pybind/pybind11/pull/1976>`_.
+
+v2.4.3 (Oct 15, 2019)
+-----------------------------------------------------
+
+* Adapt pybind11 to a C API convention change in Python 3.8. `#1950
+  <https://github.com/pybind/pybind11/pull/1950>`_.
+
+v2.4.2 (Sep 21, 2019)
+-----------------------------------------------------
+
+* Replaced usage of a C++14 only construct. `#1929
+  <https://github.com/pybind/pybind11/pull/1929>`_.
+
+* Made an ifdef future-proof for Python >= 4. `f3109d
+  <https://github.com/pybind/pybind11/commit/f3109d>`_.
+
+v2.4.1 (Sep 20, 2019)
+-----------------------------------------------------
+
+* Fixed a problem involving implicit conversion from enumerations to integers
+  on Python 3.8. `#1780 <https://github.com/pybind/pybind11/pull/1780>`_.
+
+v2.4.0 (Sep 19, 2019)
+-----------------------------------------------------
+
+* Try harder to keep pybind11-internal data structures separate when there
+  are potential ABI incompatibilities. Fixes crashes that occurred when loading
+  multiple pybind11 extensions that were e.g. compiled by GCC (libstdc++)
+  and Clang (libc++).
+  `#1588 <https://github.com/pybind/pybind11/pull/1588>`_ and
+  `c9f5a <https://github.com/pybind/pybind11/commit/c9f5a>`_.
+
+* Added support for ``__await__``, ``__aiter__``, and ``__anext__`` protocols.
+  `#1842 <https://github.com/pybind/pybind11/pull/1842>`_.
+
+* ``pybind11_add_module()``: don't strip symbols when compiling in
+  ``RelWithDebInfo`` mode. `#1980
+  <https://github.com/pybind/pybind11/pull/1980>`_.
+
+* ``enum_``: Reproduce Python behavior when comparing against invalid values
+  (e.g. ``None``, strings, etc.). Add back support for ``__invert__()``.
+  `#1912 <https://github.com/pybind/pybind11/pull/1912>`_,
+  `#1907 <https://github.com/pybind/pybind11/pull/1907>`_.
+
+* List insertion operation for ``py::list``.
+  Added ``.empty()`` to all collection types.
+  Added ``py::set::contains()`` and ``py::dict::contains()``.
+  `#1887 <https://github.com/pybind/pybind11/pull/1887>`_,
+  `#1884 <https://github.com/pybind/pybind11/pull/1884>`_,
+  `#1888 <https://github.com/pybind/pybind11/pull/1888>`_.
+
+* ``py::details::overload_cast_impl`` is available in C++11 mode, can be used
+  like ``overload_cast`` with an additional set of parantheses.
+  `#1581 <https://github.com/pybind/pybind11/pull/1581>`_.
+
+* Fixed ``get_include()`` on Conda.
+  `#1877 <https://github.com/pybind/pybind11/pull/1877>`_.
+
+* ``stl_bind.h``: negative indexing support.
+  `#1882 <https://github.com/pybind/pybind11/pull/1882>`_.
+
+* Minor CMake fix to add MinGW compatibility.
+  `#1851 <https://github.com/pybind/pybind11/pull/1851>`_.
+
+* GIL-related fixes.
+  `#1836 <https://github.com/pybind/pybind11/pull/1836>`_,
+  `8b90b <https://github.com/pybind/pybind11/commit/8b90b>`_.
+
+* Other very minor/subtle fixes and improvements.
+  `#1329 <https://github.com/pybind/pybind11/pull/1329>`_,
+  `#1910 <https://github.com/pybind/pybind11/pull/1910>`_,
+  `#1863 <https://github.com/pybind/pybind11/pull/1863>`_,
+  `#1847 <https://github.com/pybind/pybind11/pull/1847>`_,
+  `#1890 <https://github.com/pybind/pybind11/pull/1890>`_,
+  `#1860 <https://github.com/pybind/pybind11/pull/1860>`_,
+  `#1848 <https://github.com/pybind/pybind11/pull/1848>`_,
+  `#1821 <https://github.com/pybind/pybind11/pull/1821>`_,
+  `#1837 <https://github.com/pybind/pybind11/pull/1837>`_,
+  `#1833 <https://github.com/pybind/pybind11/pull/1833>`_,
+  `#1748 <https://github.com/pybind/pybind11/pull/1748>`_,
+  `#1852 <https://github.com/pybind/pybind11/pull/1852>`_.
+
+v2.3.0 (June 11, 2019)
+-----------------------------------------------------
+
+* Significantly reduced module binary size (10-20%) when compiled in C++11 mode
+  with GCC/Clang, or in any mode with MSVC. Function signatures are now always
+  precomputed at compile time (this was previously only available in C++14 mode
+  for non-MSVC compilers).
+  `#934 <https://github.com/pybind/pybind11/pull/934>`_.
+
+* Add basic support for tag-based static polymorphism, where classes
+  provide a method to returns the desired type of an instance.
+  `#1326 <https://github.com/pybind/pybind11/pull/1326>`_.
+
+* Python type wrappers (``py::handle``, ``py::object``, etc.)
+  now support map Python's number protocol onto C++ arithmetic
+  operators such as ``operator+``, ``operator/=``, etc.
+  `#1511 <https://github.com/pybind/pybind11/pull/1511>`_.
+
+* A number of improvements related to enumerations:
+
+   1. The ``enum_`` implementation was rewritten from scratch to reduce
+      code bloat. Rather than instantiating a full implementation for each
+      enumeration, most code is now contained in a generic base class.
+      `#1511 <https://github.com/pybind/pybind11/pull/1511>`_.
+
+   2. The ``value()``  method of ``py::enum_`` now accepts an optional
+      docstring that will be shown in the documentation of the associated
+      enumeration. `#1160 <https://github.com/pybind/pybind11/pull/1160>`_.
+
+   3. check for already existing enum value and throw an error if present.
+      `#1453 <https://github.com/pybind/pybind11/pull/1453>`_.
+
+* Support for over-aligned type allocation via C++17's aligned ``new``
+  statement. `#1582 <https://github.com/pybind/pybind11/pull/1582>`_.
+
+* Added ``py::ellipsis()`` method for slicing of multidimensional NumPy arrays
+  `#1502 <https://github.com/pybind/pybind11/pull/1502>`_.
+
+* Numerous Improvements to the ``mkdoc.py`` script for extracting documentation
+  from C++ header files.
+  `#1788 <https://github.com/pybind/pybind11/pull/1788>`_.
+
+* ``pybind11_add_module()``: allow including Python as a ``SYSTEM`` include path.
+  `#1416 <https://github.com/pybind/pybind11/pull/1416>`_.
+
+* ``pybind11/stl.h`` does not convert strings to ``vector<string>`` anymore.
+  `#1258 <https://github.com/pybind/pybind11/issues/1258>`_.
+
+* Mark static methods as such to fix auto-generated Sphinx documentation.
+  `#1732 <https://github.com/pybind/pybind11/pull/1732>`_.
+
+* Re-throw forced unwind exceptions (e.g. during pthread termination).
+  `#1208 <https://github.com/pybind/pybind11/pull/1208>`_.
+
+* Added ``__contains__`` method to the bindings of maps (``std::map``,
+  ``std::unordered_map``).
+  `#1767 <https://github.com/pybind/pybind11/pull/1767>`_.
+
+* Improvements to ``gil_scoped_acquire``.
+  `#1211 <https://github.com/pybind/pybind11/pull/1211>`_.
+
+* Type caster support for ``std::deque<T>``.
+  `#1609 <https://github.com/pybind/pybind11/pull/1609>`_.
+
+* Support for ``std::unique_ptr`` holders, whose deleters differ between a base and derived
+  class. `#1353 <https://github.com/pybind/pybind11/pull/1353>`_.
+
+* Construction of STL array/vector-like data structures from
+  iterators. Added an ``extend()`` operation.
+  `#1709 <https://github.com/pybind/pybind11/pull/1709>`_,
+
+* CMake build system improvements for projects that include non-C++
+  files (e.g. plain C, CUDA) in ``pybind11_add_module`` et al.
+  `#1678 <https://github.com/pybind/pybind11/pull/1678>`_.
+
+* Fixed asynchronous invocation and deallocation of Python functions
+  wrapped in ``std::function``.
+  `#1595 <https://github.com/pybind/pybind11/pull/1595>`_.
+
+* Fixes regarding return value policy propagation in STL type casters.
+  `#1603 <https://github.com/pybind/pybind11/pull/1603>`_.
+
+* Fixed scoped enum comparisons.
+  `#1571 <https://github.com/pybind/pybind11/pull/1571>`_.
+
+* Fixed iostream redirection for code that releases the GIL.
+  `#1368 <https://github.com/pybind/pybind11/pull/1368>`_,
+
+* A number of CI-related fixes.
+  `#1757 <https://github.com/pybind/pybind11/pull/1757>`_,
+  `#1744 <https://github.com/pybind/pybind11/pull/1744>`_,
+  `#1670 <https://github.com/pybind/pybind11/pull/1670>`_.
+
+v2.2.4 (September 11, 2018)
+-----------------------------------------------------
+
+* Use new Python 3.7 Thread Specific Storage (TSS) implementation if available.
+  `#1454 <https://github.com/pybind/pybind11/pull/1454>`_,
+  `#1517 <https://github.com/pybind/pybind11/pull/1517>`_.
+
+* Fixes for newer MSVC versions and C++17 mode.
+  `#1347 <https://github.com/pybind/pybind11/pull/1347>`_,
+  `#1462 <https://github.com/pybind/pybind11/pull/1462>`_.
+
+* Propagate return value policies to type-specific casters
+  when casting STL containers.
+  `#1455 <https://github.com/pybind/pybind11/pull/1455>`_.
+
+* Allow ostream-redirection of more than 1024 characters.
+  `#1479 <https://github.com/pybind/pybind11/pull/1479>`_.
+
+* Set ``Py_DEBUG`` define when compiling against a debug Python build.
+  `#1438 <https://github.com/pybind/pybind11/pull/1438>`_.
+
+* Untangle integer logic in number type caster to work for custom
+  types that may only be castable to a restricted set of builtin types.
+  `#1442 <https://github.com/pybind/pybind11/pull/1442>`_.
+
+* CMake build system: Remember Python version in cache file.
+  `#1434 <https://github.com/pybind/pybind11/pull/1434>`_.
+
+* Fix for custom smart pointers: use ``std::addressof`` to obtain holder
+  address instead of ``operator&``.
+  `#1435 <https://github.com/pybind/pybind11/pull/1435>`_.
+
+* Properly report exceptions thrown during module initialization.
+  `#1362 <https://github.com/pybind/pybind11/pull/1362>`_.
+
+* Fixed a segmentation fault when creating empty-shaped NumPy array.
+  `#1371 <https://github.com/pybind/pybind11/pull/1371>`_.
+
+* The version of Intel C++ compiler must be >= 2017, and this is now checked by
+  the header files. `#1363 <https://github.com/pybind/pybind11/pull/1363>`_.
+
+* A few minor typo fixes and improvements to the test suite, and
+  patches that silence compiler warnings.
+
+* Vectors now support construction from generators, as well as ``extend()`` from a
+  list or generator.
+  `#1496 <https://github.com/pybind/pybind11/pull/1496>`_.
+
+
+v2.2.3 (April 29, 2018)
+-----------------------------------------------------
+
+* The pybind11 header location detection was replaced by a new implementation
+  that no longer depends on ``pip`` internals (the recently released ``pip``
+  10 has restricted access to this API).
+  `#1190 <https://github.com/pybind/pybind11/pull/1190>`_.
+
+* Small adjustment to an implementation detail to work around a compiler segmentation fault in Clang 3.3/3.4.
+  `#1350 <https://github.com/pybind/pybind11/pull/1350>`_.
+
+* The minimal supported version of the Intel compiler was >= 17.0 since
+  pybind11 v2.1. This check is now explicit, and a compile-time error is raised
+  if the compiler meet the requirement.
+  `#1363 <https://github.com/pybind/pybind11/pull/1363>`_.
+
+* Fixed an endianness-related fault in the test suite.
+  `#1287 <https://github.com/pybind/pybind11/pull/1287>`_.
+
+v2.2.2 (February 7, 2018)
+-----------------------------------------------------
+
+* Fixed a segfault when combining embedded interpreter
+  shutdown/reinitialization with external loaded pybind11 modules.
+  `#1092 <https://github.com/pybind/pybind11/pull/1092>`_.
+
+* Eigen support: fixed a bug where Nx1/1xN numpy inputs couldn't be passed as
+  arguments to Eigen vectors (which for Eigen are simply compile-time fixed
+  Nx1/1xN matrices).
+  `#1106 <https://github.com/pybind/pybind11/pull/1106>`_.
+
+* Clarified to license by moving the licensing of contributions from
+  ``LICENSE`` into ``CONTRIBUTING.md``: the licensing of contributions is not
+  actually part of the software license as distributed.  This isn't meant to be
+  a substantial change in the licensing of the project, but addresses concerns
+  that the clause made the license non-standard.
+  `#1109 <https://github.com/pybind/pybind11/issues/1109>`_.
+
+* Fixed a regression introduced in 2.1 that broke binding functions with lvalue
+  character literal arguments.
+  `#1128 <https://github.com/pybind/pybind11/pull/1128>`_.
+
+* MSVC: fix for compilation failures under /permissive-, and added the flag to
+  the appveyor test suite.
+  `#1155 <https://github.com/pybind/pybind11/pull/1155>`_.
+
+* Fixed ``__qualname__`` generation, and in turn, fixes how class names
+  (especially nested class names) are shown in generated docstrings.
+  `#1171 <https://github.com/pybind/pybind11/pull/1171>`_.
+
+* Updated the FAQ with a suggested project citation reference.
+  `#1189 <https://github.com/pybind/pybind11/pull/1189>`_.
+
+* Added fixes for deprecation warnings when compiled under C++17 with
+  ``-Wdeprecated`` turned on, and add ``-Wdeprecated`` to the test suite
+  compilation flags.
+  `#1191 <https://github.com/pybind/pybind11/pull/1191>`_.
+
+* Fixed outdated PyPI URLs in ``setup.py``.
+  `#1213 <https://github.com/pybind/pybind11/pull/1213>`_.
+
+* Fixed a refcount leak for arguments that end up in a ``py::args`` argument
+  for functions with both fixed positional and ``py::args`` arguments.
+  `#1216 <https://github.com/pybind/pybind11/pull/1216>`_.
+
+* Fixed a potential segfault resulting from possible premature destruction of
+  ``py::args``/``py::kwargs`` arguments with overloaded functions.
+  `#1223 <https://github.com/pybind/pybind11/pull/1223>`_.
+
+* Fixed ``del map[item]`` for a ``stl_bind.h`` bound stl map.
+  `#1229 <https://github.com/pybind/pybind11/pull/1229>`_.
+
+* Fixed a regression from v2.1.x where the aggregate initialization could
+  unintentionally end up at a constructor taking a templated
+  ``std::initializer_list<T>`` argument.
+  `#1249 <https://github.com/pybind/pybind11/pull/1249>`_.
+
+* Fixed an issue where calling a function with a keep_alive policy on the same
+  nurse/patient pair would cause the internal patient storage to needlessly
+  grow (unboundedly, if the nurse is long-lived).
+  `#1251 <https://github.com/pybind/pybind11/issues/1251>`_.
+
+* Various other minor fixes.
+
+v2.2.1 (September 14, 2017)
+-----------------------------------------------------
+
+* Added ``py::module::reload()`` member function for reloading a module.
+  `#1040 <https://github.com/pybind/pybind11/pull/1040>`_.
+
+* Fixed a reference leak in the number converter.
+  `#1078 <https://github.com/pybind/pybind11/pull/1078>`_.
+
+* Fixed compilation with Clang on host GCC < 5 (old libstdc++ which isn't fully
+  C++11 compliant). `#1062 <https://github.com/pybind/pybind11/pull/1062>`_.
+
+* Fixed a regression where the automatic ``std::vector<bool>`` caster would
+  fail to compile. The same fix also applies to any container which returns
+  element proxies instead of references.
+  `#1053 <https://github.com/pybind/pybind11/pull/1053>`_.
+
+* Fixed a regression where the ``py::keep_alive`` policy could not be applied
+  to constructors. `#1065 <https://github.com/pybind/pybind11/pull/1065>`_.
+
+* Fixed a nullptr dereference when loading a ``py::module_local`` type
+  that's only registered in an external module.
+  `#1058 <https://github.com/pybind/pybind11/pull/1058>`_.
+
+* Fixed implicit conversion of accessors to types derived from ``py::object``.
+  `#1076 <https://github.com/pybind/pybind11/pull/1076>`_.
+
+* The ``name`` in ``PYBIND11_MODULE(name, variable)`` can now be a macro.
+  `#1082 <https://github.com/pybind/pybind11/pull/1082>`_.
+
+* Relaxed overly strict ``py::pickle()`` check for matching get and set types.
+  `#1064 <https://github.com/pybind/pybind11/pull/1064>`_.
+
+* Conversion errors now try to be more informative when it's likely that
+  a missing header is the cause (e.g. forgetting ``<pybind11/stl.h>``).
+  `#1077 <https://github.com/pybind/pybind11/pull/1077>`_.
+
+v2.2.0 (August 31, 2017)
+-----------------------------------------------------
+
+* Support for embedding the Python interpreter. See the
+  :doc:`documentation page </advanced/embedding>` for a
+  full overview of the new features.
+  `#774 <https://github.com/pybind/pybind11/pull/774>`_,
+  `#889 <https://github.com/pybind/pybind11/pull/889>`_,
+  `#892 <https://github.com/pybind/pybind11/pull/892>`_,
+  `#920 <https://github.com/pybind/pybind11/pull/920>`_.
+
+  .. code-block:: cpp
+
+      #include <pybind11/embed.h>
+      namespace py = pybind11;
+
+      int main() {
+          py::scoped_interpreter guard{}; // start the interpreter and keep it alive
+
+          py::print("Hello, World!"); // use the Python API
+      }
+
+* Support for inheriting from multiple C++ bases in Python.
+  `#693 <https://github.com/pybind/pybind11/pull/693>`_.
+
+  .. code-block:: python
+
+      from cpp_module import CppBase1, CppBase2
+
+      class PyDerived(CppBase1, CppBase2):
+          def __init__(self):
+              CppBase1.__init__(self)  # C++ bases must be initialized explicitly
+              CppBase2.__init__(self)
+
+* ``PYBIND11_MODULE`` is now the preferred way to create module entry points.
+  ``PYBIND11_PLUGIN`` is deprecated. See :ref:`macros` for details.
+  `#879 <https://github.com/pybind/pybind11/pull/879>`_.
+
+  .. code-block:: cpp
+
+      // new
+      PYBIND11_MODULE(example, m) {
+          m.def("add", [](int a, int b) { return a + b; });
+      }
+
+      // old
+      PYBIND11_PLUGIN(example) {
+          py::module m("example");
+          m.def("add", [](int a, int b) { return a + b; });
+          return m.ptr();
+      }
+
+* pybind11's headers and build system now more strictly enforce hidden symbol
+  visibility for extension modules. This should be seamless for most users,
+  but see the :doc:`upgrade` if you use a custom build system.
+  `#995 <https://github.com/pybind/pybind11/pull/995>`_.
+
+* Support for ``py::module_local`` types which allow multiple modules to
+  export the same C++ types without conflicts. This is useful for opaque
+  types like ``std::vector<int>``. ``py::bind_vector`` and ``py::bind_map``
+  now default to ``py::module_local`` if their elements are builtins or
+  local types. See :ref:`module_local` for details.
+  `#949 <https://github.com/pybind/pybind11/pull/949>`_,
+  `#981 <https://github.com/pybind/pybind11/pull/981>`_,
+  `#995 <https://github.com/pybind/pybind11/pull/995>`_,
+  `#997 <https://github.com/pybind/pybind11/pull/997>`_.
+
+* Custom constructors can now be added very easily using lambdas or factory
+  functions which return a class instance by value, pointer or holder. This
+  supersedes the old placement-new ``__init__`` technique.
+  See :ref:`custom_constructors` for details.
+  `#805 <https://github.com/pybind/pybind11/pull/805>`_,
+  `#1014 <https://github.com/pybind/pybind11/pull/1014>`_.
+
+  .. code-block:: cpp
+
+      struct Example {
+          Example(std::string);
+      };
+
+      py::class_<Example>(m, "Example")
+          .def(py::init<std::string>()) // existing constructor
+          .def(py::init([](int n) { // custom constructor
+              return std::make_unique<Example>(std::to_string(n));
+          }));
+
+* Similarly to custom constructors, pickling support functions are now bound
+  using the ``py::pickle()`` adaptor which improves type safety. See the
+  :doc:`upgrade` and :ref:`pickling` for details.
+  `#1038 <https://github.com/pybind/pybind11/pull/1038>`_.
+
+* Builtin support for converting C++17 standard library types and general
+  conversion improvements:
+
+  1. C++17 ``std::variant`` is supported right out of the box. C++11/14
+     equivalents (e.g. ``boost::variant``) can also be added with a simple
+     user-defined specialization. See :ref:`cpp17_container_casters` for details.
+     `#811 <https://github.com/pybind/pybind11/pull/811>`_,
+     `#845 <https://github.com/pybind/pybind11/pull/845>`_,
+     `#989 <https://github.com/pybind/pybind11/pull/989>`_.
+
+  2. Out-of-the-box support for C++17 ``std::string_view``.
+     `#906 <https://github.com/pybind/pybind11/pull/906>`_.
+
+  3. Improved compatibility of the builtin ``optional`` converter.
+     `#874 <https://github.com/pybind/pybind11/pull/874>`_.
+
+  4. The ``bool`` converter now accepts ``numpy.bool_`` and types which
+     define ``__bool__`` (Python 3.x) or ``__nonzero__`` (Python 2.7).
+     `#925 <https://github.com/pybind/pybind11/pull/925>`_.
+
+  5. C++-to-Python casters are now more efficient and move elements out
+     of rvalue containers whenever possible.
+     `#851 <https://github.com/pybind/pybind11/pull/851>`_,
+     `#936 <https://github.com/pybind/pybind11/pull/936>`_,
+     `#938 <https://github.com/pybind/pybind11/pull/938>`_.
+
+  6. Fixed ``bytes`` to ``std::string/char*`` conversion on Python 3.
+     `#817 <https://github.com/pybind/pybind11/pull/817>`_.
+
+  7. Fixed lifetime of temporary C++ objects created in Python-to-C++ conversions.
+     `#924 <https://github.com/pybind/pybind11/pull/924>`_.
+
+* Scope guard call policy for RAII types, e.g. ``py::call_guard<py::gil_scoped_release>()``,
+  ``py::call_guard<py::scoped_ostream_redirect>()``. See :ref:`call_policies` for details.
+  `#740 <https://github.com/pybind/pybind11/pull/740>`_.
+
+* Utility for redirecting C++ streams to Python (e.g. ``std::cout`` ->
+  ``sys.stdout``). Scope guard ``py::scoped_ostream_redirect`` in C++ and
+  a context manager in Python. See :ref:`ostream_redirect`.
+  `#1009 <https://github.com/pybind/pybind11/pull/1009>`_.
+
+* Improved handling of types and exceptions across module boundaries.
+  `#915 <https://github.com/pybind/pybind11/pull/915>`_,
+  `#951 <https://github.com/pybind/pybind11/pull/951>`_,
+  `#995 <https://github.com/pybind/pybind11/pull/995>`_.
+
+* Fixed destruction order of ``py::keep_alive`` nurse/patient objects
+  in reference cycles.
+  `#856 <https://github.com/pybind/pybind11/pull/856>`_.
+
+* Numpy and buffer protocol related improvements:
+
+  1. Support for negative strides in Python buffer objects/numpy arrays. This
+     required changing integers from unsigned to signed for the related C++ APIs.
+     Note: If you have compiler warnings enabled, you may notice some new conversion
+     warnings after upgrading. These can be resolved with ``static_cast``.
+     `#782 <https://github.com/pybind/pybind11/pull/782>`_.
+
+  2. Support ``std::complex`` and arrays inside ``PYBIND11_NUMPY_DTYPE``.
+     `#831 <https://github.com/pybind/pybind11/pull/831>`_,
+     `#832 <https://github.com/pybind/pybind11/pull/832>`_.
+
+  3. Support for constructing ``py::buffer_info`` and ``py::arrays`` using
+     arbitrary containers or iterators instead of requiring a ``std::vector``.
+     `#788 <https://github.com/pybind/pybind11/pull/788>`_,
+     `#822 <https://github.com/pybind/pybind11/pull/822>`_,
+     `#860 <https://github.com/pybind/pybind11/pull/860>`_.
+
+  4. Explicitly check numpy version and require >= 1.7.0.
+     `#819 <https://github.com/pybind/pybind11/pull/819>`_.
+
+* Support for allowing/prohibiting ``None`` for specific arguments and improved
+  ``None`` overload resolution order. See :ref:`none_arguments` for details.
+  `#843 <https://github.com/pybind/pybind11/pull/843>`_.
+  `#859 <https://github.com/pybind/pybind11/pull/859>`_.
+
+* Added ``py::exec()`` as a shortcut for ``py::eval<py::eval_statements>()``
+  and support for C++11 raw string literals as input. See :ref:`eval`.
+  `#766 <https://github.com/pybind/pybind11/pull/766>`_,
+  `#827 <https://github.com/pybind/pybind11/pull/827>`_.
+
+* ``py::vectorize()`` ignores non-vectorizable arguments and supports
+  member functions.
+  `#762 <https://github.com/pybind/pybind11/pull/762>`_.
+
+* Support for bound methods as callbacks (``pybind11/functional.h``).
+  `#815 <https://github.com/pybind/pybind11/pull/815>`_.
+
+* Allow aliasing pybind11 methods: ``cls.attr("foo") = cls.attr("bar")``.
+  `#802 <https://github.com/pybind/pybind11/pull/802>`_.
+
+* Don't allow mixed static/non-static overloads.
+  `#804 <https://github.com/pybind/pybind11/pull/804>`_.
+
+* Fixed overriding static properties in derived classes.
+  `#784 <https://github.com/pybind/pybind11/pull/784>`_.
+
+* Added support for write only properties.
+  `#1144 <https://github.com/pybind/pybind11/pull/1144>`_.
+
+* Improved deduction of member functions of a derived class when its bases
+  aren't registered with pybind11.
+  `#855 <https://github.com/pybind/pybind11/pull/855>`_.
+
+  .. code-block:: cpp
+
+      struct Base {
+          int foo() { return 42; }
+      }
+
+      struct Derived : Base {}
+
+      // Now works, but previously required also binding `Base`
+      py::class_<Derived>(m, "Derived")
+          .def("foo", &Derived::foo); // function is actually from `Base`
+
+* The implementation of ``py::init<>`` now uses C++11 brace initialization
+  syntax to construct instances, which permits binding implicit constructors of
+  aggregate types. `#1015 <https://github.com/pybind/pybind11/pull/1015>`_.
+
+    .. code-block:: cpp
+
+        struct Aggregate {
+            int a;
+            std::string b;
+        };
+
+        py::class_<Aggregate>(m, "Aggregate")
+            .def(py::init<int, const std::string &>());
+
+* Fixed issues with multiple inheritance with offset base/derived pointers.
+  `#812 <https://github.com/pybind/pybind11/pull/812>`_,
+  `#866 <https://github.com/pybind/pybind11/pull/866>`_,
+  `#960 <https://github.com/pybind/pybind11/pull/960>`_.
+
+* Fixed reference leak of type objects.
+  `#1030 <https://github.com/pybind/pybind11/pull/1030>`_.
+
+* Improved support for the ``/std:c++14`` and ``/std:c++latest`` modes
+  on MSVC 2017.
+  `#841 <https://github.com/pybind/pybind11/pull/841>`_,
+  `#999 <https://github.com/pybind/pybind11/pull/999>`_.
+
+* Fixed detection of private operator new on MSVC.
+  `#893 <https://github.com/pybind/pybind11/pull/893>`_,
+  `#918 <https://github.com/pybind/pybind11/pull/918>`_.
+
+* Intel C++ compiler compatibility fixes.
+  `#937 <https://github.com/pybind/pybind11/pull/937>`_.
+
+* Fixed implicit conversion of `py::enum_` to integer types on Python 2.7.
+  `#821 <https://github.com/pybind/pybind11/pull/821>`_.
+
+* Added ``py::hash`` to fetch the hash value of Python objects, and
+  ``.def(hash(py::self))`` to provide the C++ ``std::hash`` as the Python
+  ``__hash__`` method.
+  `#1034 <https://github.com/pybind/pybind11/pull/1034>`_.
+
+* Fixed ``__truediv__`` on Python 2 and ``__itruediv__`` on Python 3.
+  `#867 <https://github.com/pybind/pybind11/pull/867>`_.
+
+* ``py::capsule`` objects now support the ``name`` attribute. This is useful
+  for interfacing with ``scipy.LowLevelCallable``.
+  `#902 <https://github.com/pybind/pybind11/pull/902>`_.
+
+* Fixed ``py::make_iterator``'s ``__next__()`` for past-the-end calls.
+  `#897 <https://github.com/pybind/pybind11/pull/897>`_.
+
+* Added ``error_already_set::matches()`` for checking Python exceptions.
+  `#772 <https://github.com/pybind/pybind11/pull/772>`_.
+
+* Deprecated ``py::error_already_set::clear()``. It's no longer needed
+  following a simplification of the ``py::error_already_set`` class.
+  `#954 <https://github.com/pybind/pybind11/pull/954>`_.
+
+* Deprecated ``py::handle::operator==()`` in favor of ``py::handle::is()``
+  `#825 <https://github.com/pybind/pybind11/pull/825>`_.
+
+* Deprecated ``py::object::borrowed``/``py::object::stolen``.
+  Use ``py::object::borrowed_t{}``/``py::object::stolen_t{}`` instead.
+  `#771 <https://github.com/pybind/pybind11/pull/771>`_.
+
+* Changed internal data structure versioning to avoid conflicts between
+  modules compiled with different revisions of pybind11.
+  `#1012 <https://github.com/pybind/pybind11/pull/1012>`_.
+
+* Additional compile-time and run-time error checking and more informative messages.
+  `#786 <https://github.com/pybind/pybind11/pull/786>`_,
+  `#794 <https://github.com/pybind/pybind11/pull/794>`_,
+  `#803 <https://github.com/pybind/pybind11/pull/803>`_.
+
+* Various minor improvements and fixes.
+  `#764 <https://github.com/pybind/pybind11/pull/764>`_,
+  `#791 <https://github.com/pybind/pybind11/pull/791>`_,
+  `#795 <https://github.com/pybind/pybind11/pull/795>`_,
+  `#840 <https://github.com/pybind/pybind11/pull/840>`_,
+  `#844 <https://github.com/pybind/pybind11/pull/844>`_,
+  `#846 <https://github.com/pybind/pybind11/pull/846>`_,
+  `#849 <https://github.com/pybind/pybind11/pull/849>`_,
+  `#858 <https://github.com/pybind/pybind11/pull/858>`_,
+  `#862 <https://github.com/pybind/pybind11/pull/862>`_,
+  `#871 <https://github.com/pybind/pybind11/pull/871>`_,
+  `#872 <https://github.com/pybind/pybind11/pull/872>`_,
+  `#881 <https://github.com/pybind/pybind11/pull/881>`_,
+  `#888 <https://github.com/pybind/pybind11/pull/888>`_,
+  `#899 <https://github.com/pybind/pybind11/pull/899>`_,
+  `#928 <https://github.com/pybind/pybind11/pull/928>`_,
+  `#931 <https://github.com/pybind/pybind11/pull/931>`_,
+  `#944 <https://github.com/pybind/pybind11/pull/944>`_,
+  `#950 <https://github.com/pybind/pybind11/pull/950>`_,
+  `#952 <https://github.com/pybind/pybind11/pull/952>`_,
+  `#962 <https://github.com/pybind/pybind11/pull/962>`_,
+  `#965 <https://github.com/pybind/pybind11/pull/965>`_,
+  `#970 <https://github.com/pybind/pybind11/pull/970>`_,
+  `#978 <https://github.com/pybind/pybind11/pull/978>`_,
+  `#979 <https://github.com/pybind/pybind11/pull/979>`_,
+  `#986 <https://github.com/pybind/pybind11/pull/986>`_,
+  `#1020 <https://github.com/pybind/pybind11/pull/1020>`_,
+  `#1027 <https://github.com/pybind/pybind11/pull/1027>`_,
+  `#1037 <https://github.com/pybind/pybind11/pull/1037>`_.
+
+* Testing improvements.
+  `#798 <https://github.com/pybind/pybind11/pull/798>`_,
+  `#882 <https://github.com/pybind/pybind11/pull/882>`_,
+  `#898 <https://github.com/pybind/pybind11/pull/898>`_,
+  `#900 <https://github.com/pybind/pybind11/pull/900>`_,
+  `#921 <https://github.com/pybind/pybind11/pull/921>`_,
+  `#923 <https://github.com/pybind/pybind11/pull/923>`_,
+  `#963 <https://github.com/pybind/pybind11/pull/963>`_.
+
+v2.1.1 (April 7, 2017)
+-----------------------------------------------------
+
+* Fixed minimum version requirement for MSVC 2015u3
+  `#773 <https://github.com/pybind/pybind11/pull/773>`_.
+
+v2.1.0 (March 22, 2017)
+-----------------------------------------------------
+
+* pybind11 now performs function overload resolution in two phases. The first
+  phase only considers exact type matches, while the second allows for implicit
+  conversions to take place. A special ``noconvert()`` syntax can be used to
+  completely disable implicit conversions for specific arguments.
+  `#643 <https://github.com/pybind/pybind11/pull/643>`_,
+  `#634 <https://github.com/pybind/pybind11/pull/634>`_,
+  `#650 <https://github.com/pybind/pybind11/pull/650>`_.
+
+* Fixed a regression where static properties no longer worked with classes
+  using multiple inheritance. The ``py::metaclass`` attribute is no longer
+  necessary (and deprecated as of this release) when binding classes with
+  static properties.
+  `#679 <https://github.com/pybind/pybind11/pull/679>`_,
+
+* Classes bound using ``pybind11`` can now use custom metaclasses.
+  `#679 <https://github.com/pybind/pybind11/pull/679>`_,
+
+* ``py::args`` and ``py::kwargs`` can now be mixed with other positional
+  arguments when binding functions using pybind11.
+  `#611 <https://github.com/pybind/pybind11/pull/611>`_.
+
+* Improved support for C++11 unicode string and character types; added
+  extensive documentation regarding pybind11's string conversion behavior.
+  `#624 <https://github.com/pybind/pybind11/pull/624>`_,
+  `#636 <https://github.com/pybind/pybind11/pull/636>`_,
+  `#715 <https://github.com/pybind/pybind11/pull/715>`_.
+
+* pybind11 can now avoid expensive copies when converting Eigen arrays to NumPy
+  arrays (and vice versa). `#610 <https://github.com/pybind/pybind11/pull/610>`_.
+
+* The "fast path" in ``py::vectorize`` now works for any full-size group of C or
+  F-contiguous arrays. The non-fast path is also faster since it no longer performs
+  copies of the input arguments (except when type conversions are necessary).
+  `#610 <https://github.com/pybind/pybind11/pull/610>`_.
+
+* Added fast, unchecked access to NumPy arrays via a proxy object.
+  `#746 <https://github.com/pybind/pybind11/pull/746>`_.
+
+* Transparent support for class-specific ``operator new`` and
+  ``operator delete`` implementations.
+  `#755 <https://github.com/pybind/pybind11/pull/755>`_.
+
+* Slimmer and more efficient STL-compatible iterator interface for sequence types.
+  `#662 <https://github.com/pybind/pybind11/pull/662>`_.
+
+* Improved custom holder type support.
+  `#607 <https://github.com/pybind/pybind11/pull/607>`_.
+
+* ``nullptr`` to ``None`` conversion fixed in various builtin type casters.
+  `#732 <https://github.com/pybind/pybind11/pull/732>`_.
+
+* ``enum_`` now exposes its members via a special ``__members__`` attribute.
+  `#666 <https://github.com/pybind/pybind11/pull/666>`_.
+
+* ``std::vector`` bindings created using ``stl_bind.h`` can now optionally
+  implement the buffer protocol. `#488 <https://github.com/pybind/pybind11/pull/488>`_.
+
+* Automated C++ reference documentation using doxygen and breathe.
+  `#598 <https://github.com/pybind/pybind11/pull/598>`_.
+
+* Added minimum compiler version assertions.
+  `#727 <https://github.com/pybind/pybind11/pull/727>`_.
+
+* Improved compatibility with C++1z.
+  `#677 <https://github.com/pybind/pybind11/pull/677>`_.
+
+* Improved ``py::capsule`` API. Can be used to implement cleanup
+  callbacks that are involved at module destruction time.
+  `#752 <https://github.com/pybind/pybind11/pull/752>`_.
+
+* Various minor improvements and fixes.
+  `#595 <https://github.com/pybind/pybind11/pull/595>`_,
+  `#588 <https://github.com/pybind/pybind11/pull/588>`_,
+  `#589 <https://github.com/pybind/pybind11/pull/589>`_,
+  `#603 <https://github.com/pybind/pybind11/pull/603>`_,
+  `#619 <https://github.com/pybind/pybind11/pull/619>`_,
+  `#648 <https://github.com/pybind/pybind11/pull/648>`_,
+  `#695 <https://github.com/pybind/pybind11/pull/695>`_,
+  `#720 <https://github.com/pybind/pybind11/pull/720>`_,
+  `#723 <https://github.com/pybind/pybind11/pull/723>`_,
+  `#729 <https://github.com/pybind/pybind11/pull/729>`_,
+  `#724 <https://github.com/pybind/pybind11/pull/724>`_,
+  `#742 <https://github.com/pybind/pybind11/pull/742>`_,
+  `#753 <https://github.com/pybind/pybind11/pull/753>`_.
+
+v2.0.1 (Jan 4, 2017)
+-----------------------------------------------------
+
+* Fix pointer to reference error in type_caster on MSVC
+  `#583 <https://github.com/pybind/pybind11/pull/583>`_.
+
+* Fixed a segmentation in the test suite due to a typo
+  `cd7eac <https://github.com/pybind/pybind11/commit/cd7eac>`_.
+
+v2.0.0 (Jan 1, 2017)
+-----------------------------------------------------
+
+* Fixed a reference counting regression affecting types with custom metaclasses
+  (introduced in v2.0.0-rc1).
+  `#571 <https://github.com/pybind/pybind11/pull/571>`_.
+
+* Quenched a CMake policy warning.
+  `#570 <https://github.com/pybind/pybind11/pull/570>`_.
+
+v2.0.0-rc1 (Dec 23, 2016)
+-----------------------------------------------------
+
+The pybind11 developers are excited to issue a release candidate of pybind11
+with a subsequent v2.0.0 release planned in early January next year.
+
+An incredible amount of effort by went into pybind11 over the last ~5 months,
+leading to a release that is jam-packed with exciting new features and numerous
+usability improvements. The following list links PRs or individual commits
+whenever applicable.
+
+Happy Christmas!
+
+* Support for binding C++ class hierarchies that make use of multiple
+  inheritance. `#410 <https://github.com/pybind/pybind11/pull/410>`_.
+
+* PyPy support: pybind11 now supports nightly builds of PyPy and will
+  interoperate with the future 5.7 release. No code changes are necessary,
+  everything "just" works as usual. Note that we only target the Python 2.7
+  branch for now; support for 3.x will be added once its ``cpyext`` extension
+  support catches up. A few minor features remain unsupported for the time
+  being (notably dynamic attributes in custom types).
+  `#527 <https://github.com/pybind/pybind11/pull/527>`_.
+
+* Significant work on the documentation -- in particular, the monolithic
+  ``advanced.rst`` file was restructured into a easier to read hierarchical
+  organization. `#448 <https://github.com/pybind/pybind11/pull/448>`_.
+
+* Many NumPy-related improvements:
+
+  1. Object-oriented API to access and modify NumPy ``ndarray`` instances,
+     replicating much of the corresponding NumPy C API functionality.
+     `#402 <https://github.com/pybind/pybind11/pull/402>`_.
+
+  2. NumPy array ``dtype`` array descriptors are now first-class citizens and
+     are exposed via a new class ``py::dtype``.
+
+  3. Structured dtypes can be registered using the ``PYBIND11_NUMPY_DTYPE()``
+     macro. Special ``array`` constructors accepting dtype objects were also
+     added.
+
+     One potential caveat involving this change: format descriptor strings
+     should now be accessed via ``format_descriptor::format()`` (however, for
+     compatibility purposes, the old syntax ``format_descriptor::value`` will
+     still work for non-structured data types). `#308
+     <https://github.com/pybind/pybind11/pull/308>`_.
+
+  4. Further improvements to support structured dtypes throughout the system.
+     `#472 <https://github.com/pybind/pybind11/pull/472>`_,
+     `#474 <https://github.com/pybind/pybind11/pull/474>`_,
+     `#459 <https://github.com/pybind/pybind11/pull/459>`_,
+     `#453 <https://github.com/pybind/pybind11/pull/453>`_,
+     `#452 <https://github.com/pybind/pybind11/pull/452>`_, and
+     `#505 <https://github.com/pybind/pybind11/pull/505>`_.
+
+  5. Fast access operators. `#497 <https://github.com/pybind/pybind11/pull/497>`_.
+
+  6. Constructors for arrays whose storage is owned by another object.
+     `#440 <https://github.com/pybind/pybind11/pull/440>`_.
+
+  7. Added constructors for ``array`` and ``array_t`` explicitly accepting shape
+     and strides; if strides are not provided, they are deduced assuming
+     C-contiguity. Also added simplified constructors for 1-dimensional case.
+
+  8. Added buffer/NumPy support for ``char[N]`` and ``std::array<char, N>`` types.
+
+  9. Added ``memoryview`` wrapper type which is constructible from ``buffer_info``.
+
+* Eigen: many additional conversions and support for non-contiguous
+  arrays/slices.
+  `#427 <https://github.com/pybind/pybind11/pull/427>`_,
+  `#315 <https://github.com/pybind/pybind11/pull/315>`_,
+  `#316 <https://github.com/pybind/pybind11/pull/316>`_,
+  `#312 <https://github.com/pybind/pybind11/pull/312>`_, and
+  `#267 <https://github.com/pybind/pybind11/pull/267>`_
+
+* Incompatible changes in ``class_<...>::class_()``:
+
+    1. Declarations of types that provide access via the buffer protocol must
+       now include the ``py::buffer_protocol()`` annotation as an argument to
+       the ``class_`` constructor.
+
+    2. Declarations of types that require a custom metaclass (i.e. all classes
+       which include static properties via commands such as
+       ``def_readwrite_static()``) must now include the ``py::metaclass()``
+       annotation as an argument to the ``class_`` constructor.
+
+       These two changes were necessary to make type definitions in pybind11
+       future-proof, and to support PyPy via its cpyext mechanism. `#527
+       <https://github.com/pybind/pybind11/pull/527>`_.
+
+
+    3. This version of pybind11 uses a redesigned mechanism for instantiating
+       trampoline classes that are used to override virtual methods from within
+       Python. This led to the following user-visible syntax change: instead of
+
+       .. code-block:: cpp
+
+           py::class_<TrampolineClass>("MyClass")
+             .alias<MyClass>()
+             ....
+
+       write
+
+       .. code-block:: cpp
+
+           py::class_<MyClass, TrampolineClass>("MyClass")
+             ....
+
+       Importantly, both the original and the trampoline class are now
+       specified as an arguments (in arbitrary order) to the ``py::class_``
+       template, and the ``alias<..>()`` call is gone. The new scheme has zero
+       overhead in cases when Python doesn't override any functions of the
+       underlying C++ class. `rev. 86d825
+       <https://github.com/pybind/pybind11/commit/86d825>`_.
+
+* Added ``eval`` and ``eval_file`` functions for evaluating expressions and
+  statements from a string or file. `rev. 0d3fc3
+  <https://github.com/pybind/pybind11/commit/0d3fc3>`_.
+
+* pybind11 can now create types with a modifiable dictionary.
+  `#437 <https://github.com/pybind/pybind11/pull/437>`_ and
+  `#444 <https://github.com/pybind/pybind11/pull/444>`_.
+
+* Support for translation of arbitrary C++ exceptions to Python counterparts.
+  `#296 <https://github.com/pybind/pybind11/pull/296>`_ and
+  `#273 <https://github.com/pybind/pybind11/pull/273>`_.
+
+* Report full backtraces through mixed C++/Python code, better reporting for
+  import errors, fixed GIL management in exception processing.
+  `#537 <https://github.com/pybind/pybind11/pull/537>`_,
+  `#494 <https://github.com/pybind/pybind11/pull/494>`_,
+  `rev. e72d95 <https://github.com/pybind/pybind11/commit/e72d95>`_, and
+  `rev. 099d6e <https://github.com/pybind/pybind11/commit/099d6e>`_.
+
+* Support for bit-level operations, comparisons, and serialization of C++
+  enumerations. `#503 <https://github.com/pybind/pybind11/pull/503>`_,
+  `#508 <https://github.com/pybind/pybind11/pull/508>`_,
+  `#380 <https://github.com/pybind/pybind11/pull/380>`_,
+  `#309 <https://github.com/pybind/pybind11/pull/309>`_.
+  `#311 <https://github.com/pybind/pybind11/pull/311>`_.
+
+* The ``class_`` constructor now accepts its template arguments in any order.
+  `#385 <https://github.com/pybind/pybind11/pull/385>`_.
+
+* Attribute and item accessors now have a more complete interface which makes
+  it possible to chain attributes as in
+  ``obj.attr("a")[key].attr("b").attr("method")(1, 2, 3)``. `#425
+  <https://github.com/pybind/pybind11/pull/425>`_.
+
+* Major redesign of the default and conversion constructors in ``pytypes.h``.
+  `#464 <https://github.com/pybind/pybind11/pull/464>`_.
+
+* Added built-in support for ``std::shared_ptr`` holder type. It is no longer
+  necessary to to include a declaration of the form
+  ``PYBIND11_DECLARE_HOLDER_TYPE(T, std::shared_ptr<T>)`` (though continuing to
+  do so won't cause an error).
+  `#454 <https://github.com/pybind/pybind11/pull/454>`_.
+
+* New ``py::overload_cast`` casting operator to select among multiple possible
+  overloads of a function. An example:
+
+    .. code-block:: cpp
+
+        py::class_<Pet>(m, "Pet")
+            .def("set", py::overload_cast<int>(&Pet::set), "Set the pet's age")
+            .def("set", py::overload_cast<const std::string &>(&Pet::set), "Set the pet's name");
+
+  This feature only works on C++14-capable compilers.
+  `#541 <https://github.com/pybind/pybind11/pull/541>`_.
+
+* C++ types are automatically cast to Python types, e.g. when assigning
+  them as an attribute. For instance, the following is now legal:
+
+    .. code-block:: cpp
+
+        py::module m = /* ... */
+        m.attr("constant") = 123;
+
+  (Previously, a ``py::cast`` call was necessary to avoid a compilation error.)
+  `#551 <https://github.com/pybind/pybind11/pull/551>`_.
+
+* Redesigned ``pytest``-based test suite. `#321 <https://github.com/pybind/pybind11/pull/321>`_.
+
+* Instance tracking to detect reference leaks in test suite. `#324 <https://github.com/pybind/pybind11/pull/324>`_
+
+* pybind11 can now distinguish between multiple different instances that are
+  located at the same memory address, but which have different types.
+  `#329 <https://github.com/pybind/pybind11/pull/329>`_.
+
+* Improved logic in ``move`` return value policy.
+  `#510 <https://github.com/pybind/pybind11/pull/510>`_,
+  `#297 <https://github.com/pybind/pybind11/pull/297>`_.
+
+* Generalized unpacking API to permit calling Python functions from C++ using
+  notation such as ``foo(a1, a2, *args, "ka"_a=1, "kb"_a=2, **kwargs)``. `#372 <https://github.com/pybind/pybind11/pull/372>`_.
+
+* ``py::print()`` function whose behavior matches that of the native Python
+  ``print()`` function. `#372 <https://github.com/pybind/pybind11/pull/372>`_.
+
+* Added ``py::dict`` keyword constructor:``auto d = dict("number"_a=42,
+  "name"_a="World");``. `#372 <https://github.com/pybind/pybind11/pull/372>`_.
+
+* Added ``py::str::format()`` method and ``_s`` literal: ``py::str s = "1 + 2
+  = {}"_s.format(3);``. `#372 <https://github.com/pybind/pybind11/pull/372>`_.
+
+* Added ``py::repr()`` function which is equivalent to Python's builtin
+  ``repr()``. `#333 <https://github.com/pybind/pybind11/pull/333>`_.
+
+* Improved construction and destruction logic for holder types. It is now
+  possible to reference instances with smart pointer holder types without
+  constructing the holder if desired. The ``PYBIND11_DECLARE_HOLDER_TYPE``
+  macro now accepts an optional second parameter to indicate whether the holder
+  type uses intrusive reference counting.
+  `#533 <https://github.com/pybind/pybind11/pull/533>`_ and
+  `#561 <https://github.com/pybind/pybind11/pull/561>`_.
+
+* Mapping a stateless C++ function to Python and back is now "for free" (i.e.
+  no extra indirections or argument conversion overheads). `rev. 954b79
+  <https://github.com/pybind/pybind11/commit/954b79>`_.
+
+* Bindings for ``std::valarray<T>``.
+  `#545 <https://github.com/pybind/pybind11/pull/545>`_.
+
+* Improved support for C++17 capable compilers.
+  `#562 <https://github.com/pybind/pybind11/pull/562>`_.
+
+* Bindings for ``std::optional<t>``.
+  `#475 <https://github.com/pybind/pybind11/pull/475>`_,
+  `#476 <https://github.com/pybind/pybind11/pull/476>`_,
+  `#479 <https://github.com/pybind/pybind11/pull/479>`_,
+  `#499 <https://github.com/pybind/pybind11/pull/499>`_, and
+  `#501 <https://github.com/pybind/pybind11/pull/501>`_.
+
+* ``stl_bind.h``: general improvements and support for ``std::map`` and
+  ``std::unordered_map``.
+  `#490 <https://github.com/pybind/pybind11/pull/490>`_,
+  `#282 <https://github.com/pybind/pybind11/pull/282>`_,
+  `#235 <https://github.com/pybind/pybind11/pull/235>`_.
+
+* The ``std::tuple``, ``std::pair``, ``std::list``, and ``std::vector`` type
+  casters now accept any Python sequence type as input. `rev. 107285
+  <https://github.com/pybind/pybind11/commit/107285>`_.
+
+* Improved CMake Python detection on multi-architecture Linux.
+  `#532 <https://github.com/pybind/pybind11/pull/532>`_.
+
+* Infrastructure to selectively disable or enable parts of the automatically
+  generated docstrings. `#486 <https://github.com/pybind/pybind11/pull/486>`_.
+
+* ``reference`` and ``reference_internal`` are now the default return value
+  properties for static and non-static properties, respectively. `#473
+  <https://github.com/pybind/pybind11/pull/473>`_. (the previous defaults
+  were ``automatic``). `#473 <https://github.com/pybind/pybind11/pull/473>`_.
+
+* Support for ``std::unique_ptr`` with non-default deleters or no deleter at
+  all (``py::nodelete``). `#384 <https://github.com/pybind/pybind11/pull/384>`_.
+
+* Deprecated ``handle::call()`` method. The new syntax to call Python
+  functions is simply ``handle()``. It can also be invoked explicitly via
+  ``handle::operator<X>()``, where ``X`` is an optional return value policy.
+
+* Print more informative error messages when ``make_tuple()`` or ``cast()``
+  fail. `#262 <https://github.com/pybind/pybind11/pull/262>`_.
+
+* Creation of holder types for classes deriving from
+  ``std::enable_shared_from_this<>`` now also works for ``const`` values.
+  `#260 <https://github.com/pybind/pybind11/pull/260>`_.
+
+* ``make_iterator()`` improvements for better compatibility with various
+  types (now uses prefix increment operator); it now also accepts iterators
+  with different begin/end types as long as they are equality comparable.
+  `#247 <https://github.com/pybind/pybind11/pull/247>`_.
+
+* ``arg()`` now accepts a wider range of argument types for default values.
+  `#244 <https://github.com/pybind/pybind11/pull/244>`_.
+
+* Support ``keep_alive`` where the nurse object may be ``None``. `#341
+  <https://github.com/pybind/pybind11/pull/341>`_.
+
+* Added constructors for ``str`` and ``bytes`` from zero-terminated char
+  pointers, and from char pointers and length. Added constructors for ``str``
+  from ``bytes`` and for ``bytes`` from ``str``, which will perform UTF-8
+  decoding/encoding as required.
+
+* Many other improvements of library internals without user-visible changes
+
+
+1.8.1 (July 12, 2016)
+----------------------
+* Fixed a rare but potentially very severe issue when the garbage collector ran
+  during pybind11 type creation.
+
+1.8.0 (June 14, 2016)
+----------------------
+* Redesigned CMake build system which exports a convenient
+  ``pybind11_add_module`` function to parent projects.
+* ``std::vector<>`` type bindings analogous to Boost.Python's ``indexing_suite``
+* Transparent conversion of sparse and dense Eigen matrices and vectors (``eigen.h``)
+* Added an ``ExtraFlags`` template argument to the NumPy ``array_t<>`` wrapper
+  to disable an enforced cast that may lose precision, e.g. to create overloads
+  for different precisions and complex vs real-valued matrices.
+* Prevent implicit conversion of floating point values to integral types in
+  function arguments
+* Fixed incorrect default return value policy for functions returning a shared
+  pointer
+* Don't allow registering a type via ``class_`` twice
+* Don't allow casting a ``None`` value into a C++ lvalue reference
+* Fixed a crash in ``enum_::operator==`` that was triggered by the ``help()`` command
+* Improved detection of whether or not custom C++ types can be copy/move-constructed
+* Extended ``str`` type to also work with ``bytes`` instances
+* Added a ``"name"_a`` user defined string literal that is equivalent to ``py::arg("name")``.
+* When specifying function arguments via ``py::arg``, the test that verifies
+  the number of arguments now runs at compile time.
+* Added ``[[noreturn]]`` attribute to ``pybind11_fail()`` to quench some
+  compiler warnings
+* List function arguments in exception text when the dispatch code cannot find
+  a matching overload
+* Added ``PYBIND11_OVERLOAD_NAME`` and ``PYBIND11_OVERLOAD_PURE_NAME`` macros which
+  can be used to override virtual methods whose name differs in C++ and Python
+  (e.g. ``__call__`` and ``operator()``)
+* Various minor ``iterator`` and ``make_iterator()`` improvements
+* Transparently support ``__bool__`` on Python 2.x and Python 3.x
+* Fixed issue with destructor of unpickled object not being called
+* Minor CMake build system improvements on Windows
+* New ``pybind11::args`` and ``pybind11::kwargs`` types to create functions which
+  take an arbitrary number of arguments and keyword arguments
+* New syntax to call a Python function from C++ using ``*args`` and ``*kwargs``
+* The functions ``def_property_*`` now correctly process docstring arguments (these
+  formerly caused a segmentation fault)
+* Many ``mkdoc.py`` improvements (enumerations, template arguments, ``DOC()``
+  macro accepts more arguments)
+* Cygwin support
+* Documentation improvements (pickling support, ``keep_alive``, macro usage)
+
+1.7 (April 30, 2016)
+----------------------
+* Added a new ``move`` return value policy that triggers C++11 move semantics.
+  The automatic return value policy falls back to this case whenever a rvalue
+  reference is encountered
+* Significantly more general GIL state routines that are used instead of
+  Python's troublesome ``PyGILState_Ensure`` and ``PyGILState_Release`` API
+* Redesign of opaque types that drastically simplifies their usage
+* Extended ability to pass values of type ``[const] void *``
+* ``keep_alive`` fix: don't fail when there is no patient
+* ``functional.h``: acquire the GIL before calling a Python function
+* Added Python RAII type wrappers ``none`` and ``iterable``
+* Added ``*args`` and ``*kwargs`` pass-through parameters to
+  ``pybind11.get_include()`` function
+* Iterator improvements and fixes
+* Documentation on return value policies and opaque types improved
+
+1.6 (April 30, 2016)
+----------------------
+* Skipped due to upload to PyPI gone wrong and inability to recover
+  (https://github.com/pypa/packaging-problems/issues/74)
+
+1.5 (April 21, 2016)
+----------------------
+* For polymorphic types, use RTTI to try to return the closest type registered with pybind11
+* Pickling support for serializing and unserializing C++ instances to a byte stream in Python
+* Added a convenience routine ``make_iterator()`` which turns a range indicated
+  by a pair of C++ iterators into a iterable Python object
+* Added ``len()`` and a variadic ``make_tuple()`` function
+* Addressed a rare issue that could confuse the current virtual function
+  dispatcher and another that could lead to crashes in multi-threaded
+  applications
+* Added a ``get_include()`` function to the Python module that returns the path
+  of the directory containing the installed pybind11 header files
+* Documentation improvements: import issues, symbol visibility, pickling, limitations
+* Added casting support for ``std::reference_wrapper<>``
+
+1.4 (April 7, 2016)
+--------------------------
+* Transparent type conversion for ``std::wstring`` and ``wchar_t``
+* Allow passing ``nullptr``-valued strings
+* Transparent passing of ``void *`` pointers using capsules
+* Transparent support for returning values wrapped in ``std::unique_ptr<>``
+* Improved docstring generation for compatibility with Sphinx
+* Nicer debug error message when default parameter construction fails
+* Support for "opaque" types that bypass the transparent conversion layer for STL containers
+* Redesigned type casting interface to avoid ambiguities that could occasionally cause compiler errors
+* Redesigned property implementation; fixes crashes due to an unfortunate default return value policy
+* Anaconda package generation support
+
+1.3 (March 8, 2016)
+--------------------------
+
+* Added support for the Intel C++ compiler (v15+)
+* Added support for the STL unordered set/map data structures
+* Added support for the STL linked list data structure
+* NumPy-style broadcasting support in ``pybind11::vectorize``
+* pybind11 now displays more verbose error messages when ``arg::operator=()`` fails
+* pybind11 internal data structures now live in a version-dependent namespace to avoid ABI issues
+* Many, many bugfixes involving corner cases and advanced usage
+
+1.2 (February 7, 2016)
+--------------------------
+
+* Optional: efficient generation of function signatures at compile time using C++14
+* Switched to a simpler and more general way of dealing with function default
+  arguments. Unused keyword arguments in function calls are now detected and
+  cause errors as expected
+* New ``keep_alive`` call policy analogous to Boost.Python's ``with_custodian_and_ward``
+* New ``pybind11::base<>`` attribute to indicate a subclass relationship
+* Improved interface for RAII type wrappers in ``pytypes.h``
+* Use RAII type wrappers consistently within pybind11 itself. This
+  fixes various potential refcount leaks when exceptions occur
+* Added new ``bytes`` RAII type wrapper (maps to ``string`` in Python 2.7)
+* Made handle and related RAII classes const correct, using them more
+  consistently everywhere now
+* Got rid of the ugly ``__pybind11__`` attributes on the Python side---they are
+  now stored in a C++ hash table that is not visible in Python
+* Fixed refcount leaks involving NumPy arrays and bound functions
+* Vastly improved handling of shared/smart pointers
+* Removed an unnecessary copy operation in ``pybind11::vectorize``
+* Fixed naming clashes when both pybind11 and NumPy headers are included
+* Added conversions for additional exception types
+* Documentation improvements (using multiple extension modules, smart pointers,
+  other minor clarifications)
+* unified infrastructure for parsing variadic arguments in ``class_`` and cpp_function
+* Fixed license text (was: ZLIB, should have been: 3-clause BSD)
+* Python 3.2 compatibility
+* Fixed remaining issues when accessing types in another plugin module
+* Added enum comparison and casting methods
+* Improved SFINAE-based detection of whether types are copy-constructible
+* Eliminated many warnings about unused variables and the use of ``offsetof()``
+* Support for ``std::array<>`` conversions
+
+1.1 (December 7, 2015)
+--------------------------
+
+* Documentation improvements (GIL, wrapping functions, casting, fixed many typos)
+* Generalized conversion of integer types
+* Improved support for casting function objects
+* Improved support for ``std::shared_ptr<>`` conversions
+* Initial support for ``std::set<>`` conversions
+* Fixed type resolution issue for types defined in a separate plugin module
+* Cmake build system improvements
+* Factored out generic functionality to non-templated code (smaller code size)
+* Added a code size / compile time benchmark vs Boost.Python
+* Added an appveyor CI script
+
+1.0 (October 15, 2015)
+------------------------
+* Initial release
diff --git a/3rdparty/pybind11/docs/classes.rst b/3rdparty/pybind11/docs/classes.rst
new file mode 100644
index 00000000..a63f6a19
--- /dev/null
+++ b/3rdparty/pybind11/docs/classes.rst
@@ -0,0 +1,532 @@
+.. _classes:
+
+Object-oriented code
+####################
+
+Creating bindings for a custom type
+===================================
+
+Let's now look at a more complex example where we'll create bindings for a
+custom C++ data structure named ``Pet``. Its definition is given below:
+
+.. code-block:: cpp
+
+    struct Pet {
+        Pet(const std::string &name) : name(name) { }
+        void setName(const std::string &name_) { name = name_; }
+        const std::string &getName() const { return name; }
+
+        std::string name;
+    };
+
+The binding code for ``Pet`` looks as follows:
+
+.. code-block:: cpp
+
+    #include <pybind11/pybind11.h>
+
+    namespace py = pybind11;
+
+    PYBIND11_MODULE(example, m) {
+        py::class_<Pet>(m, "Pet")
+            .def(py::init<const std::string &>())
+            .def("setName", &Pet::setName)
+            .def("getName", &Pet::getName);
+    }
+
+:class:`class_` creates bindings for a C++ *class* or *struct*-style data
+structure. :func:`init` is a convenience function that takes the types of a
+constructor's parameters as template arguments and wraps the corresponding
+constructor (see the :ref:`custom_constructors` section for details). An
+interactive Python session demonstrating this example is shown below:
+
+.. code-block:: pycon
+
+    % python
+    >>> import example
+    >>> p = example.Pet('Molly')
+    >>> print(p)
+    <example.Pet object at 0x10cd98060>
+    >>> p.getName()
+    u'Molly'
+    >>> p.setName('Charly')
+    >>> p.getName()
+    u'Charly'
+
+.. seealso::
+
+    Static member functions can be bound in the same way using
+    :func:`class_::def_static`.
+
+Keyword and default arguments
+=============================
+It is possible to specify keyword and default arguments using the syntax
+discussed in the previous chapter. Refer to the sections :ref:`keyword_args`
+and :ref:`default_args` for details.
+
+Binding lambda functions
+========================
+
+Note how ``print(p)`` produced a rather useless summary of our data structure in the example above:
+
+.. code-block:: pycon
+
+    >>> print(p)
+    <example.Pet object at 0x10cd98060>
+
+To address this, we could bind an utility function that returns a human-readable
+summary to the special method slot named ``__repr__``. Unfortunately, there is no
+suitable functionality in the ``Pet`` data structure, and it would be nice if
+we did not have to change it. This can easily be accomplished by binding a
+Lambda function instead:
+
+.. code-block:: cpp
+
+        py::class_<Pet>(m, "Pet")
+            .def(py::init<const std::string &>())
+            .def("setName", &Pet::setName)
+            .def("getName", &Pet::getName)
+            .def("__repr__",
+                [](const Pet &a) {
+                    return "<example.Pet named '" + a.name + "'>";
+                }
+            );
+
+Both stateless [#f1]_ and stateful lambda closures are supported by pybind11.
+With the above change, the same Python code now produces the following output:
+
+.. code-block:: pycon
+
+    >>> print(p)
+    <example.Pet named 'Molly'>
+
+.. [#f1] Stateless closures are those with an empty pair of brackets ``[]`` as the capture object.
+
+.. _properties:
+
+Instance and static fields
+==========================
+
+We can also directly expose the ``name`` field using the
+:func:`class_::def_readwrite` method. A similar :func:`class_::def_readonly`
+method also exists for ``const`` fields.
+
+.. code-block:: cpp
+
+        py::class_<Pet>(m, "Pet")
+            .def(py::init<const std::string &>())
+            .def_readwrite("name", &Pet::name)
+            // ... remainder ...
+
+This makes it possible to write
+
+.. code-block:: pycon
+
+    >>> p = example.Pet('Molly')
+    >>> p.name
+    u'Molly'
+    >>> p.name = 'Charly'
+    >>> p.name
+    u'Charly'
+
+Now suppose that ``Pet::name`` was a private internal variable
+that can only be accessed via setters and getters.
+
+.. code-block:: cpp
+
+    class Pet {
+    public:
+        Pet(const std::string &name) : name(name) { }
+        void setName(const std::string &name_) { name = name_; }
+        const std::string &getName() const { return name; }
+    private:
+        std::string name;
+    };
+
+In this case, the method :func:`class_::def_property`
+(:func:`class_::def_property_readonly` for read-only data) can be used to
+provide a field-like interface within Python that will transparently call
+the setter and getter functions:
+
+.. code-block:: cpp
+
+        py::class_<Pet>(m, "Pet")
+            .def(py::init<const std::string &>())
+            .def_property("name", &Pet::getName, &Pet::setName)
+            // ... remainder ...
+
+Write only properties can be defined by passing ``nullptr`` as the
+input for the read function.
+
+.. seealso::
+
+    Similar functions :func:`class_::def_readwrite_static`,
+    :func:`class_::def_readonly_static` :func:`class_::def_property_static`,
+    and :func:`class_::def_property_readonly_static` are provided for binding
+    static variables and properties. Please also see the section on
+    :ref:`static_properties` in the advanced part of the documentation.
+
+Dynamic attributes
+==================
+
+Native Python classes can pick up new attributes dynamically:
+
+.. code-block:: pycon
+
+    >>> class Pet:
+    ...     name = 'Molly'
+    ...
+    >>> p = Pet()
+    >>> p.name = 'Charly'  # overwrite existing
+    >>> p.age = 2  # dynamically add a new attribute
+
+By default, classes exported from C++ do not support this and the only writable
+attributes are the ones explicitly defined using :func:`class_::def_readwrite`
+or :func:`class_::def_property`.
+
+.. code-block:: cpp
+
+    py::class_<Pet>(m, "Pet")
+        .def(py::init<>())
+        .def_readwrite("name", &Pet::name);
+
+Trying to set any other attribute results in an error:
+
+.. code-block:: pycon
+
+    >>> p = example.Pet()
+    >>> p.name = 'Charly'  # OK, attribute defined in C++
+    >>> p.age = 2  # fail
+    AttributeError: 'Pet' object has no attribute 'age'
+
+To enable dynamic attributes for C++ classes, the :class:`py::dynamic_attr` tag
+must be added to the :class:`py::class_` constructor:
+
+.. code-block:: cpp
+
+    py::class_<Pet>(m, "Pet", py::dynamic_attr())
+        .def(py::init<>())
+        .def_readwrite("name", &Pet::name);
+
+Now everything works as expected:
+
+.. code-block:: pycon
+
+    >>> p = example.Pet()
+    >>> p.name = 'Charly'  # OK, overwrite value in C++
+    >>> p.age = 2  # OK, dynamically add a new attribute
+    >>> p.__dict__  # just like a native Python class
+    {'age': 2}
+
+Note that there is a small runtime cost for a class with dynamic attributes.
+Not only because of the addition of a ``__dict__``, but also because of more
+expensive garbage collection tracking which must be activated to resolve
+possible circular references. Native Python classes incur this same cost by
+default, so this is not anything to worry about. By default, pybind11 classes
+are more efficient than native Python classes. Enabling dynamic attributes
+just brings them on par.
+
+.. _inheritance:
+
+Inheritance and automatic downcasting
+=====================================
+
+Suppose now that the example consists of two data structures with an
+inheritance relationship:
+
+.. code-block:: cpp
+
+    struct Pet {
+        Pet(const std::string &name) : name(name) { }
+        std::string name;
+    };
+
+    struct Dog : Pet {
+        Dog(const std::string &name) : Pet(name) { }
+        std::string bark() const { return "woof!"; }
+    };
+
+There are two different ways of indicating a hierarchical relationship to
+pybind11: the first specifies the C++ base class as an extra template
+parameter of the :class:`class_`:
+
+.. code-block:: cpp
+
+    py::class_<Pet>(m, "Pet")
+       .def(py::init<const std::string &>())
+       .def_readwrite("name", &Pet::name);
+
+    // Method 1: template parameter:
+    py::class_<Dog, Pet /* <- specify C++ parent type */>(m, "Dog")
+        .def(py::init<const std::string &>())
+        .def("bark", &Dog::bark);
+
+Alternatively, we can also assign a name to the previously bound ``Pet``
+:class:`class_` object and reference it when binding the ``Dog`` class:
+
+.. code-block:: cpp
+
+    py::class_<Pet> pet(m, "Pet");
+    pet.def(py::init<const std::string &>())
+       .def_readwrite("name", &Pet::name);
+
+    // Method 2: pass parent class_ object:
+    py::class_<Dog>(m, "Dog", pet /* <- specify Python parent type */)
+        .def(py::init<const std::string &>())
+        .def("bark", &Dog::bark);
+
+Functionality-wise, both approaches are equivalent. Afterwards, instances will
+expose fields and methods of both types:
+
+.. code-block:: pycon
+
+    >>> p = example.Dog('Molly')
+    >>> p.name
+    u'Molly'
+    >>> p.bark()
+    u'woof!'
+
+The C++ classes defined above are regular non-polymorphic types with an
+inheritance relationship. This is reflected in Python:
+
+.. code-block:: cpp
+
+    // Return a base pointer to a derived instance
+    m.def("pet_store", []() { return std::unique_ptr<Pet>(new Dog("Molly")); });
+
+.. code-block:: pycon
+
+    >>> p = example.pet_store()
+    >>> type(p)  # `Dog` instance behind `Pet` pointer
+    Pet          # no pointer downcasting for regular non-polymorphic types
+    >>> p.bark()
+    AttributeError: 'Pet' object has no attribute 'bark'
+
+The function returned a ``Dog`` instance, but because it's a non-polymorphic
+type behind a base pointer, Python only sees a ``Pet``. In C++, a type is only
+considered polymorphic if it has at least one virtual function and pybind11
+will automatically recognize this:
+
+.. code-block:: cpp
+
+    struct PolymorphicPet {
+        virtual ~PolymorphicPet() = default;
+    };
+
+    struct PolymorphicDog : PolymorphicPet {
+        std::string bark() const { return "woof!"; }
+    };
+
+    // Same binding code
+    py::class_<PolymorphicPet>(m, "PolymorphicPet");
+    py::class_<PolymorphicDog, PolymorphicPet>(m, "PolymorphicDog")
+        .def(py::init<>())
+        .def("bark", &PolymorphicDog::bark);
+
+    // Again, return a base pointer to a derived instance
+    m.def("pet_store2", []() { return std::unique_ptr<PolymorphicPet>(new PolymorphicDog); });
+
+.. code-block:: pycon
+
+    >>> p = example.pet_store2()
+    >>> type(p)
+    PolymorphicDog  # automatically downcast
+    >>> p.bark()
+    u'woof!'
+
+Given a pointer to a polymorphic base, pybind11 performs automatic downcasting
+to the actual derived type. Note that this goes beyond the usual situation in
+C++: we don't just get access to the virtual functions of the base, we get the
+concrete derived type including functions and attributes that the base type may
+not even be aware of.
+
+.. seealso::
+
+    For more information about polymorphic behavior see :ref:`overriding_virtuals`.
+
+
+Overloaded methods
+==================
+
+Sometimes there are several overloaded C++ methods with the same name taking
+different kinds of input arguments:
+
+.. code-block:: cpp
+
+    struct Pet {
+        Pet(const std::string &name, int age) : name(name), age(age) { }
+
+        void set(int age_) { age = age_; }
+        void set(const std::string &name_) { name = name_; }
+
+        std::string name;
+        int age;
+    };
+
+Attempting to bind ``Pet::set`` will cause an error since the compiler does not
+know which method the user intended to select. We can disambiguate by casting
+them to function pointers. Binding multiple functions to the same Python name
+automatically creates a chain of function overloads that will be tried in
+sequence.
+
+.. code-block:: cpp
+
+    py::class_<Pet>(m, "Pet")
+       .def(py::init<const std::string &, int>())
+       .def("set", (void (Pet::*)(int)) &Pet::set, "Set the pet's age")
+       .def("set", (void (Pet::*)(const std::string &)) &Pet::set, "Set the pet's name");
+
+The overload signatures are also visible in the method's docstring:
+
+.. code-block:: pycon
+
+    >>> help(example.Pet)
+
+    class Pet(__builtin__.object)
+     |  Methods defined here:
+     |
+     |  __init__(...)
+     |      Signature : (Pet, str, int) -> NoneType
+     |
+     |  set(...)
+     |      1. Signature : (Pet, int) -> NoneType
+     |
+     |      Set the pet's age
+     |
+     |      2. Signature : (Pet, str) -> NoneType
+     |
+     |      Set the pet's name
+
+If you have a C++14 compatible compiler [#cpp14]_, you can use an alternative
+syntax to cast the overloaded function:
+
+.. code-block:: cpp
+
+    py::class_<Pet>(m, "Pet")
+        .def("set", py::overload_cast<int>(&Pet::set), "Set the pet's age")
+        .def("set", py::overload_cast<const std::string &>(&Pet::set), "Set the pet's name");
+
+Here, ``py::overload_cast`` only requires the parameter types to be specified.
+The return type and class are deduced. This avoids the additional noise of
+``void (Pet::*)()`` as seen in the raw cast. If a function is overloaded based
+on constness, the ``py::const_`` tag should be used:
+
+.. code-block:: cpp
+
+    struct Widget {
+        int foo(int x, float y);
+        int foo(int x, float y) const;
+    };
+
+    py::class_<Widget>(m, "Widget")
+       .def("foo_mutable", py::overload_cast<int, float>(&Widget::foo))
+       .def("foo_const",   py::overload_cast<int, float>(&Widget::foo, py::const_));
+
+If you prefer the ``py::overload_cast`` syntax but have a C++11 compatible compiler only,
+you can use ``py::detail::overload_cast_impl`` with an additional set of parentheses:
+
+.. code-block:: cpp
+
+    template <typename... Args>
+    using overload_cast_ = pybind11::detail::overload_cast_impl<Args...>;
+
+    py::class_<Pet>(m, "Pet")
+        .def("set", overload_cast_<int>()(&Pet::set), "Set the pet's age")
+        .def("set", overload_cast_<const std::string &>()(&Pet::set), "Set the pet's name");
+
+.. [#cpp14] A compiler which supports the ``-std=c++14`` flag
+            or Visual Studio 2015 Update 2 and newer.
+
+.. note::
+
+    To define multiple overloaded constructors, simply declare one after the
+    other using the ``.def(py::init<...>())`` syntax. The existing machinery
+    for specifying keyword and default arguments also works.
+
+Enumerations and internal types
+===============================
+
+Let's now suppose that the example class contains an internal enumeration type,
+e.g.:
+
+.. code-block:: cpp
+
+    struct Pet {
+        enum Kind {
+            Dog = 0,
+            Cat
+        };
+
+        Pet(const std::string &name, Kind type) : name(name), type(type) { }
+
+        std::string name;
+        Kind type;
+    };
+
+The binding code for this example looks as follows:
+
+.. code-block:: cpp
+
+    py::class_<Pet> pet(m, "Pet");
+
+    pet.def(py::init<const std::string &, Pet::Kind>())
+        .def_readwrite("name", &Pet::name)
+        .def_readwrite("type", &Pet::type);
+
+    py::enum_<Pet::Kind>(pet, "Kind")
+        .value("Dog", Pet::Kind::Dog)
+        .value("Cat", Pet::Kind::Cat)
+        .export_values();
+
+To ensure that the ``Kind`` type is created within the scope of ``Pet``, the
+``pet`` :class:`class_` instance must be supplied to the :class:`enum_`.
+constructor. The :func:`enum_::export_values` function exports the enum entries
+into the parent scope, which should be skipped for newer C++11-style strongly
+typed enums.
+
+.. code-block:: pycon
+
+    >>> p = Pet('Lucy', Pet.Cat)
+    >>> p.type
+    Kind.Cat
+    >>> int(p.type)
+    1L
+
+The entries defined by the enumeration type are exposed in the ``__members__`` property:
+
+.. code-block:: pycon
+
+    >>> Pet.Kind.__members__
+    {'Dog': Kind.Dog, 'Cat': Kind.Cat}
+
+The ``name`` property returns the name of the enum value as a unicode string.
+
+.. note::
+
+    It is also possible to use ``str(enum)``, however these accomplish different
+    goals. The following shows how these two approaches differ.
+
+    .. code-block:: pycon
+
+        >>> p = Pet( "Lucy", Pet.Cat )
+        >>> pet_type = p.type
+        >>> pet_type
+        Pet.Cat
+        >>> str(pet_type)
+        'Pet.Cat'
+        >>> pet_type.name
+        'Cat'
+
+.. note::
+
+    When the special tag ``py::arithmetic()`` is specified to the ``enum_``
+    constructor, pybind11 creates an enumeration that also supports rudimentary
+    arithmetic and bit-level operations like comparisons, and, or, xor, negation,
+    etc.
+
+    .. code-block:: cpp
+
+        py::enum_<Pet::Kind>(pet, "Kind", py::arithmetic())
+           ...
+
+    By default, these are omitted to conserve space.
diff --git a/3rdparty/pybind11/docs/compiling.rst b/3rdparty/pybind11/docs/compiling.rst
new file mode 100644
index 00000000..c50c7d8a
--- /dev/null
+++ b/3rdparty/pybind11/docs/compiling.rst
@@ -0,0 +1,289 @@
+.. _compiling:
+
+Build systems
+#############
+
+Building with setuptools
+========================
+
+For projects on PyPI, building with setuptools is the way to go. Sylvain Corlay
+has kindly provided an example project which shows how to set up everything,
+including automatic generation of documentation using Sphinx. Please refer to
+the [python_example]_ repository.
+
+.. [python_example] https://github.com/pybind/python_example
+
+Building with cppimport
+========================
+
+[cppimport]_ is a small Python import hook that determines whether there is a C++
+source file whose name matches the requested module. If there is, the file is
+compiled as a Python extension using pybind11 and placed in the same folder as
+the C++ source file. Python is then able to find the module and load it.
+
+.. [cppimport] https://github.com/tbenthompson/cppimport
+
+.. _cmake:
+
+Building with CMake
+===================
+
+For C++ codebases that have an existing CMake-based build system, a Python
+extension module can be created with just a few lines of code:
+
+.. code-block:: cmake
+
+    cmake_minimum_required(VERSION 2.8.12)
+    project(example)
+
+    add_subdirectory(pybind11)
+    pybind11_add_module(example example.cpp)
+
+This assumes that the pybind11 repository is located in a subdirectory named
+:file:`pybind11` and that the code is located in a file named :file:`example.cpp`.
+The CMake command ``add_subdirectory`` will import the pybind11 project which
+provides the ``pybind11_add_module`` function. It will take care of all the
+details needed to build a Python extension module on any platform.
+
+A working sample project, including a way to invoke CMake from :file:`setup.py` for
+PyPI integration, can be found in the [cmake_example]_  repository.
+
+.. [cmake_example] https://github.com/pybind/cmake_example
+
+pybind11_add_module
+-------------------
+
+To ease the creation of Python extension modules, pybind11 provides a CMake
+function with the following signature:
+
+.. code-block:: cmake
+
+    pybind11_add_module(<name> [MODULE | SHARED] [EXCLUDE_FROM_ALL]
+                        [NO_EXTRAS] [SYSTEM] [THIN_LTO] source1 [source2 ...])
+
+This function behaves very much like CMake's builtin ``add_library`` (in fact,
+it's a wrapper function around that command). It will add a library target
+called ``<name>`` to be built from the listed source files. In addition, it
+will take care of all the Python-specific compiler and linker flags as well
+as the OS- and Python-version-specific file extension. The produced target
+``<name>`` can be further manipulated with regular CMake commands.
+
+``MODULE`` or ``SHARED`` may be given to specify the type of library. If no
+type is given, ``MODULE`` is used by default which ensures the creation of a
+Python-exclusive module. Specifying ``SHARED`` will create a more traditional
+dynamic library which can also be linked from elsewhere. ``EXCLUDE_FROM_ALL``
+removes this target from the default build (see CMake docs for details).
+
+Since pybind11 is a template library, ``pybind11_add_module`` adds compiler
+flags to ensure high quality code generation without bloat arising from long
+symbol names and duplication of code in different translation units. It
+sets default visibility to *hidden*, which is required for some pybind11
+features and functionality when attempting to load multiple pybind11 modules
+compiled under different pybind11 versions.  It also adds additional flags
+enabling LTO (Link Time Optimization) and strip unneeded symbols. See the
+:ref:`FAQ entry <faq:symhidden>` for a more detailed explanation. These
+latter optimizations are never applied in ``Debug`` mode.  If ``NO_EXTRAS`` is
+given, they will always be disabled, even in ``Release`` mode. However, this
+will result in code bloat and is generally not recommended.
+
+By default, pybind11 and Python headers will be included with ``-I``. In order
+to include pybind11 as system library, e.g. to avoid warnings in downstream
+code with warn-levels outside of pybind11's scope, set the option ``SYSTEM``.
+
+As stated above, LTO is enabled by default. Some newer compilers also support
+different flavors of LTO such as `ThinLTO`_. Setting ``THIN_LTO`` will cause
+the function to prefer this flavor if available. The function falls back to
+regular LTO if ``-flto=thin`` is not available.
+
+.. _ThinLTO: http://clang.llvm.org/docs/ThinLTO.html
+
+Configuration variables
+-----------------------
+
+By default, pybind11 will compile modules with the C++14 standard, if available
+on the target compiler, falling back to C++11 if C++14 support is not
+available.  Note, however, that this default is subject to change: future
+pybind11 releases are expected to migrate to newer C++ standards as they become
+available.  To override this, the standard flag can be given explicitly in
+``PYBIND11_CPP_STANDARD``:
+
+.. code-block:: cmake
+
+    # Use just one of these:
+    # GCC/clang:
+    set(PYBIND11_CPP_STANDARD -std=c++11)
+    set(PYBIND11_CPP_STANDARD -std=c++14)
+    set(PYBIND11_CPP_STANDARD -std=c++1z) # Experimental C++17 support
+    # MSVC:
+    set(PYBIND11_CPP_STANDARD /std:c++14)
+    set(PYBIND11_CPP_STANDARD /std:c++latest) # Enables some MSVC C++17 features
+
+    add_subdirectory(pybind11)  # or find_package(pybind11)
+
+Note that this and all other configuration variables must be set **before** the
+call to ``add_subdirectory`` or ``find_package``. The variables can also be set
+when calling CMake from the command line using the ``-D<variable>=<value>`` flag.
+
+The target Python version can be selected by setting ``PYBIND11_PYTHON_VERSION``
+or an exact Python installation can be specified with ``PYTHON_EXECUTABLE``.
+For example:
+
+.. code-block:: bash
+
+    cmake -DPYBIND11_PYTHON_VERSION=3.6 ..
+    # or
+    cmake -DPYTHON_EXECUTABLE=path/to/python ..
+
+find_package vs. add_subdirectory
+---------------------------------
+
+For CMake-based projects that don't include the pybind11 repository internally,
+an external installation can be detected through ``find_package(pybind11)``.
+See the `Config file`_ docstring for details of relevant CMake variables.
+
+.. code-block:: cmake
+
+    cmake_minimum_required(VERSION 2.8.12)
+    project(example)
+
+    find_package(pybind11 REQUIRED)
+    pybind11_add_module(example example.cpp)
+
+Note that ``find_package(pybind11)`` will only work correctly if pybind11
+has been correctly installed on the system, e. g. after downloading or cloning
+the pybind11 repository  :
+
+.. code-block:: bash
+
+    cd pybind11
+    mkdir build
+    cd build
+    cmake ..
+    make install
+
+Once detected, the aforementioned ``pybind11_add_module`` can be employed as
+before. The function usage and configuration variables are identical no matter
+if pybind11 is added as a subdirectory or found as an installed package. You
+can refer to the same [cmake_example]_ repository for a full sample project
+-- just swap out ``add_subdirectory`` for ``find_package``.
+
+.. _Config file: https://github.com/pybind/pybind11/blob/master/tools/pybind11Config.cmake.in
+
+Advanced: interface library target
+----------------------------------
+
+When using a version of CMake greater than 3.0, pybind11 can additionally
+be used as a special *interface library* . The target ``pybind11::module``
+is available with pybind11 headers, Python headers and libraries as needed,
+and C++ compile definitions attached. This target is suitable for linking
+to an independently constructed (through ``add_library``, not
+``pybind11_add_module``) target in the consuming project.
+
+.. code-block:: cmake
+
+    cmake_minimum_required(VERSION 3.0)
+    project(example)
+
+    find_package(pybind11 REQUIRED)  # or add_subdirectory(pybind11)
+
+    add_library(example MODULE main.cpp)
+    target_link_libraries(example PRIVATE pybind11::module)
+    set_target_properties(example PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
+                                             SUFFIX "${PYTHON_MODULE_EXTENSION}")
+
+.. warning::
+
+    Since pybind11 is a metatemplate library, it is crucial that certain
+    compiler flags are provided to ensure high quality code generation. In
+    contrast to the ``pybind11_add_module()`` command, the CMake interface
+    library only provides the *minimal* set of parameters to ensure that the
+    code using pybind11 compiles, but it does **not** pass these extra compiler
+    flags (i.e. this is up to you).
+
+    These include Link Time Optimization (``-flto`` on GCC/Clang/ICPC, ``/GL``
+    and ``/LTCG`` on Visual Studio) and .OBJ files with many sections on Visual
+    Studio (``/bigobj``).  The :ref:`FAQ <faq:symhidden>` contains an
+    explanation on why these are needed.
+
+Embedding the Python interpreter
+--------------------------------
+
+In addition to extension modules, pybind11 also supports embedding Python into
+a C++ executable or library. In CMake, simply link with the ``pybind11::embed``
+target. It provides everything needed to get the interpreter running. The Python
+headers and libraries are attached to the target. Unlike ``pybind11::module``,
+there is no need to manually set any additional properties here. For more
+information about usage in C++, see :doc:`/advanced/embedding`.
+
+.. code-block:: cmake
+
+    cmake_minimum_required(VERSION 3.0)
+    project(example)
+
+    find_package(pybind11 REQUIRED)  # or add_subdirectory(pybind11)
+
+    add_executable(example main.cpp)
+    target_link_libraries(example PRIVATE pybind11::embed)
+
+.. _building_manually:
+
+Building manually
+=================
+
+pybind11 is a header-only library, hence it is not necessary to link against
+any special libraries and there are no intermediate (magic) translation steps.
+
+On Linux, you can compile an example such as the one given in
+:ref:`simple_example` using the following command:
+
+.. code-block:: bash
+
+    $ c++ -O3 -Wall -shared -std=c++11 -fPIC `python3 -m pybind11 --includes` example.cpp -o example`python3-config --extension-suffix`
+
+The flags given here assume that you're using Python 3. For Python 2, just
+change the executable appropriately (to ``python`` or ``python2``).
+
+The ``python3 -m pybind11 --includes`` command fetches the include paths for
+both pybind11 and Python headers. This assumes that pybind11 has been installed
+using ``pip`` or ``conda``. If it hasn't, you can also manually specify
+``-I <path-to-pybind11>/include`` together with the Python includes path
+``python3-config --includes``.
+
+Note that Python 2.7 modules don't use a special suffix, so you should simply
+use ``example.so`` instead of ``example`python3-config --extension-suffix```.
+Besides, the ``--extension-suffix`` option may or may not be available, depending
+on the distribution; in the latter case, the module extension can be manually
+set to ``.so``.
+
+On Mac OS: the build command is almost the same but it also requires passing
+the ``-undefined dynamic_lookup`` flag so as to ignore missing symbols when
+building the module:
+
+.. code-block:: bash
+
+    $ c++ -O3 -Wall -shared -std=c++11 -undefined dynamic_lookup `python3 -m pybind11 --includes` example.cpp -o example`python3-config --extension-suffix`
+
+In general, it is advisable to include several additional build parameters
+that can considerably reduce the size of the created binary. Refer to section
+:ref:`cmake` for a detailed example of a suitable cross-platform CMake-based
+build system that works on all platforms including Windows.
+
+.. note::
+
+    On Linux and macOS, it's better to (intentionally) not link against
+    ``libpython``. The symbols will be resolved when the extension library
+    is loaded into a Python binary. This is preferable because you might
+    have several different installations of a given Python version (e.g. the
+    system-provided Python, and one that ships with a piece of commercial
+    software). In this way, the plugin will work with both versions, instead
+    of possibly importing a second Python library into a process that already
+    contains one (which will lead to a segfault).
+
+Generating binding code automatically
+=====================================
+
+The ``Binder`` project is a tool for automatic generation of pybind11 binding
+code by introspecting existing C++ codebases using LLVM/Clang. See the
+[binder]_ documentation for details.
+
+.. [binder] http://cppbinder.readthedocs.io/en/latest/about.html
diff --git a/3rdparty/pybind11/docs/conf.py b/3rdparty/pybind11/docs/conf.py
new file mode 100644
index 00000000..fa6332de
--- /dev/null
+++ b/3rdparty/pybind11/docs/conf.py
@@ -0,0 +1,332 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# pybind11 documentation build configuration file, created by
+# sphinx-quickstart on Sun Oct 11 19:23:48 2015.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import sys
+import os
+import shlex
+import subprocess
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = ['breathe']
+
+breathe_projects = {'pybind11': '.build/doxygenxml/'}
+breathe_default_project = 'pybind11'
+breathe_domain_by_extension = {'h': 'cpp'}
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['.templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The encoding of source files.
+#source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = 'pybind11'
+copyright = '2017, Wenzel Jakob'
+author = 'Wenzel Jakob'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = '2.5'
+# The full version, including alpha/beta/rc tags.
+release = '2.5.0'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = ['.build', 'release.rst']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+default_role = 'any'
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+#pygments_style = 'monokai'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+#keep_warnings = False
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+
+if not on_rtd:  # only import and set the theme if we're building docs locally
+    import sphinx_rtd_theme
+    html_theme = 'sphinx_rtd_theme'
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
+    html_context = {
+        'css_files': [
+            '_static/theme_overrides.css'
+        ]
+    }
+else:
+    html_context = {
+        'css_files': [
+            '//media.readthedocs.org/css/sphinx_rtd_theme.css',            
+            '//media.readthedocs.org/css/readthedocs-doc-embed.css',    
+            '_static/theme_overrides.css'
+        ]
+    }
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = []
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+#html_title = None
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+#html_extra_path = []
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_domain_indices = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = None
+
+# Language to be used for generating the HTML full-text search index.
+# Sphinx supports the following languages:
+#   'da', 'de', 'en', 'es', 'fi', 'fr', 'h', 'it', 'ja'
+#   'nl', 'no', 'pt', 'ro', 'r', 'sv', 'tr'
+#html_search_language = 'en'
+
+# A dictionary with options for the search language support, empty by default.
+# Now only 'ja' uses this config value
+#html_search_options = {'type': 'default'}
+
+# The name of a javascript file (relative to the configuration directory) that
+# implements a search results scorer. If empty, the default will be used.
+#html_search_scorer = 'scorer.js'
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'pybind11doc'
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+# The paper size ('letterpaper' or 'a4paper').
+#'papersize': 'letterpaper',
+
+# The font size ('10pt', '11pt' or '12pt').
+#'pointsize': '10pt',
+
+# Additional stuff for the LaTeX preamble.
+'preamble': '\DeclareUnicodeCharacter{00A0}{}',
+
+# Latex figure (float) alignment
+#'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+  (master_doc, 'pybind11.tex', 'pybind11 Documentation',
+   'Wenzel Jakob', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+# latex_logo = 'pybind11-logo.png'
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#latex_use_parts = False
+
+# If true, show page references after internal links.
+#latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+#latex_show_urls = False
+
+# Documents to append as an appendix to all manuals.
+#latex_appendices = []
+
+# If false, no module index is generated.
+#latex_domain_indices = True
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'pybind11', 'pybind11 Documentation',
+     [author], 1)
+]
+
+# If true, show URL addresses after external links.
+#man_show_urls = False
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+  (master_doc, 'pybind11', 'pybind11 Documentation',
+   author, 'pybind11', 'One line description of project.',
+   'Miscellaneous'),
+]
+
+# Documents to append as an appendix to all manuals.
+#texinfo_appendices = []
+
+# If false, no module index is generated.
+#texinfo_domain_indices = True
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+#texinfo_show_urls = 'footnote'
+
+# If true, do not generate a @detailmenu in the "Top" node's menu.
+#texinfo_no_detailmenu = False
+
+primary_domain = 'cpp'
+highlight_language = 'cpp'
+
+
+def generate_doxygen_xml(app):
+    build_dir = os.path.join(app.confdir, '.build')
+    if not os.path.exists(build_dir):
+        os.mkdir(build_dir)
+
+    try:
+        subprocess.call(['doxygen', '--version'])
+        retcode = subprocess.call(['doxygen'], cwd=app.confdir)
+        if retcode < 0:
+            sys.stderr.write("doxygen error code: {}\n".format(-retcode))
+    except OSError as e:
+        sys.stderr.write("doxygen execution failed: {}\n".format(e))
+
+
+def setup(app):
+    """Add hook for building doxygen xml when needed"""
+    app.connect("builder-inited", generate_doxygen_xml)
diff --git a/3rdparty/pybind11/docs/faq.rst b/3rdparty/pybind11/docs/faq.rst
new file mode 100644
index 00000000..4d491fb8
--- /dev/null
+++ b/3rdparty/pybind11/docs/faq.rst
@@ -0,0 +1,324 @@
+Frequently asked questions
+##########################
+
+"ImportError: dynamic module does not define init function"
+===========================================================
+
+1. Make sure that the name specified in PYBIND11_MODULE is identical to the
+filename of the extension library (without prefixes such as .so)
+
+2. If the above did not fix the issue, you are likely using an incompatible
+version of Python (for instance, the extension library was compiled against
+Python 2, while the interpreter is running on top of some version of Python
+3, or vice versa).
+
+"Symbol not found: ``__Py_ZeroStruct`` / ``_PyInstanceMethod_Type``"
+========================================================================
+
+See the first answer.
+
+"SystemError: dynamic module not initialized properly"
+======================================================
+
+See the first answer.
+
+The Python interpreter immediately crashes when importing my module
+===================================================================
+
+See the first answer.
+
+CMake doesn't detect the right Python version
+=============================================
+
+The CMake-based build system will try to automatically detect the installed
+version of Python and link against that. When this fails, or when there are
+multiple versions of Python and it finds the wrong one, delete
+``CMakeCache.txt`` and then invoke CMake as follows:
+
+.. code-block:: bash
+
+    cmake -DPYTHON_EXECUTABLE:FILEPATH=<path-to-python-executable> .
+
+.. _faq_reference_arguments:
+
+Limitations involving reference arguments
+=========================================
+
+In C++, it's fairly common to pass arguments using mutable references or
+mutable pointers, which allows both read and write access to the value
+supplied by the caller. This is sometimes done for efficiency reasons, or to
+realize functions that have multiple return values. Here are two very basic
+examples:
+
+.. code-block:: cpp
+
+    void increment(int &i) { i++; }
+    void increment_ptr(int *i) { (*i)++; }
+
+In Python, all arguments are passed by reference, so there is no general
+issue in binding such code from Python.
+
+However, certain basic Python types (like ``str``, ``int``, ``bool``,
+``float``, etc.) are **immutable**. This means that the following attempt
+to port the function to Python doesn't have the same effect on the value
+provided by the caller -- in fact, it does nothing at all.
+
+.. code-block:: python
+
+    def increment(i):
+        i += 1 # nope..
+
+pybind11 is also affected by such language-level conventions, which means that
+binding ``increment`` or ``increment_ptr`` will also create Python functions
+that don't modify their arguments.
+
+Although inconvenient, one workaround is to encapsulate the immutable types in
+a custom type that does allow modifications.
+
+An other alternative involves binding a small wrapper lambda function that
+returns a tuple with all output arguments (see the remainder of the
+documentation for examples on binding lambda functions). An example:
+
+.. code-block:: cpp
+
+    int foo(int &i) { i++; return 123; }
+
+and the binding code
+
+.. code-block:: cpp
+
+   m.def("foo", [](int i) { int rv = foo(i); return std::make_tuple(rv, i); });
+
+
+How can I reduce the build time?
+================================
+
+It's good practice to split binding code over multiple files, as in the
+following example:
+
+:file:`example.cpp`:
+
+.. code-block:: cpp
+
+    void init_ex1(py::module &);
+    void init_ex2(py::module &);
+    /* ... */
+
+    PYBIND11_MODULE(example, m) {
+        init_ex1(m);
+        init_ex2(m);
+        /* ... */
+    }
+
+:file:`ex1.cpp`:
+
+.. code-block:: cpp
+
+    void init_ex1(py::module &m) {
+        m.def("add", [](int a, int b) { return a + b; });
+    }
+
+:file:`ex2.cpp`:
+
+.. code-block:: cpp
+
+    void init_ex2(py::module &m) {
+        m.def("sub", [](int a, int b) { return a - b; });
+    }
+
+:command:`python`:
+
+.. code-block:: pycon
+
+    >>> import example
+    >>> example.add(1, 2)
+    3
+    >>> example.sub(1, 1)
+    0
+
+As shown above, the various ``init_ex`` functions should be contained in
+separate files that can be compiled independently from one another, and then
+linked together into the same final shared object.  Following this approach
+will:
+
+1. reduce memory requirements per compilation unit.
+
+2. enable parallel builds (if desired).
+
+3. allow for faster incremental builds. For instance, when a single class
+   definition is changed, only a subset of the binding code will generally need
+   to be recompiled.
+
+"recursive template instantiation exceeded maximum depth of 256"
+================================================================
+
+If you receive an error about excessive recursive template evaluation, try
+specifying a larger value, e.g. ``-ftemplate-depth=1024`` on GCC/Clang. The
+culprit is generally the generation of function signatures at compile time
+using C++14 template metaprogramming.
+
+.. _`faq:hidden_visibility`:
+
+"‘SomeClass’ declared with greater visibility than the type of its field ‘SomeClass::member’ [-Wattributes]"
+============================================================================================================
+
+This error typically indicates that you are compiling without the required
+``-fvisibility`` flag.  pybind11 code internally forces hidden visibility on
+all internal code, but if non-hidden (and thus *exported*) code attempts to
+include a pybind type (for example, ``py::object`` or ``py::list``) you can run
+into this warning.
+
+To avoid it, make sure you are specifying ``-fvisibility=hidden`` when
+compiling pybind code.
+
+As to why ``-fvisibility=hidden`` is necessary, because pybind modules could
+have been compiled under different versions of pybind itself, it is also
+important that the symbols defined in one module do not clash with the
+potentially-incompatible symbols defined in another.  While Python extension
+modules are usually loaded with localized symbols (under POSIX systems
+typically using ``dlopen`` with the ``RTLD_LOCAL`` flag), this Python default
+can be changed, but even if it isn't it is not always enough to guarantee
+complete independence of the symbols involved when not using
+``-fvisibility=hidden``.
+
+Additionally, ``-fvisiblity=hidden`` can deliver considerably binary size
+savings.  (See the following section for more details).
+
+
+.. _`faq:symhidden`:
+
+How can I create smaller binaries?
+==================================
+
+To do its job, pybind11 extensively relies on a programming technique known as
+*template metaprogramming*, which is a way of performing computation at compile
+time using type information. Template metaprogamming usually instantiates code
+involving significant numbers of deeply nested types that are either completely
+removed or reduced to just a few instructions during the compiler's optimization
+phase. However, due to the nested nature of these types, the resulting symbol
+names in the compiled extension library can be extremely long. For instance,
+the included test suite contains the following symbol:
+
+.. only:: html
+
+    .. code-block:: none
+
+        _​_​Z​N​8​p​y​b​i​n​d​1​1​1​2​c​p​p​_​f​u​n​c​t​i​o​n​C​1​I​v​8​E​x​a​m​p​l​e​2​J​R​N​S​t​3​_​_​1​6​v​e​c​t​o​r​I​N​S​3​_​1​2​b​a​s​i​c​_​s​t​r​i​n​g​I​w​N​S​3​_​1​1​c​h​a​r​_​t​r​a​i​t​s​I​w​E​E​N​S​3​_​9​a​l​l​o​c​a​t​o​r​I​w​E​E​E​E​N​S​8​_​I​S​A​_​E​E​E​E​E​J​N​S​_​4​n​a​m​e​E​N​S​_​7​s​i​b​l​i​n​g​E​N​S​_​9​i​s​_​m​e​t​h​o​d​E​A​2​8​_​c​E​E​E​M​T​0​_​F​T​_​D​p​T​1​_​E​D​p​R​K​T​2​_
+
+.. only:: not html
+
+    .. code-block:: cpp
+
+        __ZN8pybind1112cpp_functionC1Iv8Example2JRNSt3__16vectorINS3_12basic_stringIwNS3_11char_traitsIwEENS3_9allocatorIwEEEENS8_ISA_EEEEEJNS_4nameENS_7siblingENS_9is_methodEA28_cEEEMT0_FT_DpT1_EDpRKT2_
+
+which is the mangled form of the following function type:
+
+.. code-block:: cpp
+
+    pybind11::cpp_function::cpp_function<void, Example2, std::__1::vector<std::__1::basic_string<wchar_t, std::__1::char_traits<wchar_t>, std::__1::allocator<wchar_t> >, std::__1::allocator<std::__1::basic_string<wchar_t, std::__1::char_traits<wchar_t>, std::__1::allocator<wchar_t> > > >&, pybind11::name, pybind11::sibling, pybind11::is_method, char [28]>(void (Example2::*)(std::__1::vector<std::__1::basic_string<wchar_t, std::__1::char_traits<wchar_t>, std::__1::allocator<wchar_t> >, std::__1::allocator<std::__1::basic_string<wchar_t, std::__1::char_traits<wchar_t>, std::__1::allocator<wchar_t> > > >&), pybind11::name const&, pybind11::sibling const&, pybind11::is_method const&, char const (&) [28])
+
+The memory needed to store just the mangled name of this function (196 bytes)
+is larger than the actual piece of code (111 bytes) it represents! On the other
+hand, it's silly to even give this function a name -- after all, it's just a
+tiny cog in a bigger piece of machinery that is not exposed to the outside
+world. So we'll generally only want to export symbols for those functions which
+are actually called from the outside.
+
+This can be achieved by specifying the parameter ``-fvisibility=hidden`` to GCC
+and Clang, which sets the default symbol visibility to *hidden*, which has a
+tremendous impact on the final binary size of the resulting extension library.
+(On Visual Studio, symbols are already hidden by default, so nothing needs to
+be done there.)
+
+In addition to decreasing binary size, ``-fvisibility=hidden`` also avoids
+potential serious issues when loading multiple modules and is required for
+proper pybind operation.  See the previous FAQ entry for more details.
+
+Working with ancient Visual Studio 2008 builds on Windows
+=========================================================
+
+The official Windows distributions of Python are compiled using truly
+ancient versions of Visual Studio that lack good C++11 support. Some users
+implicitly assume that it would be impossible to load a plugin built with
+Visual Studio 2015 into a Python distribution that was compiled using Visual
+Studio 2008. However, no such issue exists: it's perfectly legitimate to
+interface DLLs that are built with different compilers and/or C libraries.
+Common gotchas to watch out for involve not ``free()``-ing memory region
+that that were ``malloc()``-ed in another shared library, using data
+structures with incompatible ABIs, and so on. pybind11 is very careful not
+to make these types of mistakes.
+
+How can I properly handle Ctrl-C in long-running functions?
+===========================================================
+
+Ctrl-C is received by the Python interpreter, and holds it until the GIL
+is released, so a long-running function won't be interrupted.
+
+To interrupt from inside your function, you can use the ``PyErr_CheckSignals()``
+function, that will tell if a signal has been raised on the Python side.  This
+function merely checks a flag, so its impact is negligible. When a signal has
+been received, you must either explicitly interrupt execution by throwing
+``py::error_already_set`` (which will propagate the existing
+``KeyboardInterrupt``), or clear the error (which you usually will not want):
+
+.. code-block:: cpp
+
+    PYBIND11_MODULE(example, m)
+    {
+        m.def("long running_func", []()
+        {
+            for (;;) {
+                if (PyErr_CheckSignals() != 0)
+                    throw py::error_already_set();
+                // Long running iteration
+            }
+        });
+    }
+
+Inconsistent detection of Python version in CMake and pybind11
+==============================================================
+
+The functions ``find_package(PythonInterp)`` and ``find_package(PythonLibs)`` provided by CMake
+for Python version detection are not used by pybind11 due to unreliability and limitations that make
+them unsuitable for pybind11's needs. Instead pybind provides its own, more reliable Python detection
+CMake code. Conflicts can arise, however, when using pybind11 in a project that *also* uses the CMake
+Python detection in a system with several Python versions installed.
+
+This difference may cause inconsistencies and errors if *both* mechanisms are used in the same project. Consider the following
+Cmake code executed in a system with Python 2.7 and 3.x installed:
+
+.. code-block:: cmake
+
+    find_package(PythonInterp)
+    find_package(PythonLibs)
+    find_package(pybind11)
+
+It will detect Python 2.7 and pybind11 will pick it as well.
+
+In contrast this code:
+
+.. code-block:: cmake
+
+    find_package(pybind11)
+    find_package(PythonInterp)
+    find_package(PythonLibs)
+
+will detect Python 3.x for pybind11 and may crash on ``find_package(PythonLibs)`` afterwards.
+
+It is advised to avoid using ``find_package(PythonInterp)`` and ``find_package(PythonLibs)`` from CMake and rely
+on pybind11 in detecting Python version. If this is not possible CMake machinery should be called *before* including pybind11.
+
+How to cite this project?
+=========================
+
+We suggest the following BibTeX template to cite pybind11 in scientific
+discourse:
+
+.. code-block:: bash
+
+    @misc{pybind11,
+       author = {Wenzel Jakob and Jason Rhinelander and Dean Moldovan},
+       year = {2017},
+       note = {https://github.com/pybind/pybind11},
+       title = {pybind11 -- Seamless operability between C++11 and Python}
+    }
diff --git a/3rdparty/pybind11/docs/index.rst b/3rdparty/pybind11/docs/index.rst
new file mode 100644
index 00000000..d236611b
--- /dev/null
+++ b/3rdparty/pybind11/docs/index.rst
@@ -0,0 +1,47 @@
+.. only: not latex
+
+    .. image:: pybind11-logo.png
+
+pybind11 --- Seamless operability between C++11 and Python
+==========================================================
+
+.. only: not latex
+
+    Contents:
+
+.. toctree::
+   :maxdepth: 1
+
+   intro
+   changelog
+   upgrade
+
+.. toctree::
+   :caption: The Basics
+   :maxdepth: 2
+
+   basics
+   classes
+   compiling
+
+.. toctree::
+   :caption: Advanced Topics
+   :maxdepth: 2
+
+   advanced/functions
+   advanced/classes
+   advanced/exceptions
+   advanced/smart_ptrs
+   advanced/cast/index
+   advanced/pycpp/index
+   advanced/embedding
+   advanced/misc
+
+.. toctree::
+   :caption: Extra Information
+   :maxdepth: 1
+
+   faq
+   benchmark
+   limitations
+   reference
diff --git a/3rdparty/pybind11/docs/intro.rst b/3rdparty/pybind11/docs/intro.rst
new file mode 100644
index 00000000..10e1799a
--- /dev/null
+++ b/3rdparty/pybind11/docs/intro.rst
@@ -0,0 +1,93 @@
+.. image:: pybind11-logo.png
+
+About this project
+==================
+**pybind11** is a lightweight header-only library that exposes C++ types in Python
+and vice versa, mainly to create Python bindings of existing C++ code. Its
+goals and syntax are similar to the excellent `Boost.Python`_ library by David
+Abrahams: to minimize boilerplate code in traditional extension modules by
+inferring type information using compile-time introspection.
+
+.. _Boost.Python: http://www.boost.org/doc/libs/release/libs/python/doc/index.html
+
+The main issue with Boost.Python—and the reason for creating such a similar
+project—is Boost. Boost is an enormously large and complex suite of utility
+libraries that works with almost every C++ compiler in existence. This
+compatibility has its cost: arcane template tricks and workarounds are
+necessary to support the oldest and buggiest of compiler specimens. Now that
+C++11-compatible compilers are widely available, this heavy machinery has
+become an excessively large and unnecessary dependency.
+Think of this library as a tiny self-contained version of Boost.Python with
+everything stripped away that isn't relevant for binding generation. Without
+comments, the core header files only require ~4K lines of code and depend on
+Python (2.7 or 3.x, or PyPy2.7 >= 5.7) and the C++ standard library. This
+compact implementation was possible thanks to some of the new C++11 language
+features (specifically: tuples, lambda functions and variadic templates). Since
+its creation, this library has grown beyond Boost.Python in many ways, leading
+to dramatically simpler binding code in many common situations.
+
+Core features
+*************
+The following core C++ features can be mapped to Python
+
+- Functions accepting and returning custom data structures per value, reference, or pointer
+- Instance methods and static methods
+- Overloaded functions
+- Instance attributes and static attributes
+- Arbitrary exception types
+- Enumerations
+- Callbacks
+- Iterators and ranges
+- Custom operators
+- Single and multiple inheritance
+- STL data structures
+- Smart pointers with reference counting like ``std::shared_ptr``
+- Internal references with correct reference counting
+- C++ classes with virtual (and pure virtual) methods can be extended in Python
+
+Goodies
+*******
+In addition to the core functionality, pybind11 provides some extra goodies:
+
+- Python 2.7, 3.x, and PyPy (PyPy2.7 >= 5.7) are supported with an
+  implementation-agnostic interface.
+
+- It is possible to bind C++11 lambda functions with captured variables. The
+  lambda capture data is stored inside the resulting Python function object.
+
+- pybind11 uses C++11 move constructors and move assignment operators whenever
+  possible to efficiently transfer custom data types.
+
+- It's easy to expose the internal storage of custom data types through
+  Pythons' buffer protocols. This is handy e.g. for fast conversion between
+  C++ matrix classes like Eigen and NumPy without expensive copy operations.
+
+- pybind11 can automatically vectorize functions so that they are transparently
+  applied to all entries of one or more NumPy array arguments.
+
+- Python's slice-based access and assignment operations can be supported with
+  just a few lines of code.
+
+- Everything is contained in just a few header files; there is no need to link
+  against any additional libraries.
+
+- Binaries are generally smaller by a factor of at least 2 compared to
+  equivalent bindings generated by Boost.Python. A recent pybind11 conversion
+  of `PyRosetta`_, an enormous Boost.Python binding project, reported a binary
+  size reduction of **5.4x** and compile time reduction by **5.8x**.
+
+- Function signatures are precomputed at compile time (using ``constexpr``),
+  leading to smaller binaries.
+
+- With little extra effort, C++ types can be pickled and unpickled similar to
+  regular Python objects.
+
+.. _PyRosetta: http://graylab.jhu.edu/RosettaCon2016/PyRosetta-4.pdf
+
+Supported compilers
+*******************
+
+1. Clang/LLVM (any non-ancient version with C++11 support)
+2. GCC 4.8 or newer
+3. Microsoft Visual Studio 2015 or newer
+4. Intel C++ compiler v17 or newer (v16 with pybind11 v2.0 and v15 with pybind11 v2.0 and a `workaround <https://github.com/pybind/pybind11/issues/276>`_ )
diff --git a/3rdparty/pybind11/docs/limitations.rst b/3rdparty/pybind11/docs/limitations.rst
new file mode 100644
index 00000000..a1a4f1af
--- /dev/null
+++ b/3rdparty/pybind11/docs/limitations.rst
@@ -0,0 +1,20 @@
+Limitations
+###########
+
+pybind11 strives to be a general solution to binding generation, but it also has
+certain limitations:
+
+- pybind11 casts away ``const``-ness in function arguments and return values.
+  This is in line with the Python language, which has no concept of ``const``
+  values. This means that some additional care is needed to avoid bugs that
+  would be caught by the type checker in a traditional C++ program.
+
+- The NumPy interface ``pybind11::array`` greatly simplifies accessing
+  numerical data from C++ (and vice versa), but it's not a full-blown array
+  class like ``Eigen::Array`` or ``boost.multi_array``.
+
+These features could be implemented but would lead to a significant increase in
+complexity. I've decided to draw the line here to keep this project simple and
+compact. Users who absolutely require these features are encouraged to fork
+pybind11.
+
diff --git a/3rdparty/pybind11/docs/pybind11-logo.png b/3rdparty/pybind11/docs/pybind11-logo.png
new file mode 100644
index 00000000..4cbad54f
--- /dev/null
+++ b/3rdparty/pybind11/docs/pybind11-logo.png
diff --git a/3rdparty/pybind11/docs/pybind11_vs_boost_python1.png b/3rdparty/pybind11/docs/pybind11_vs_boost_python1.png
new file mode 100644
index 00000000..833231f2
--- /dev/null
+++ b/3rdparty/pybind11/docs/pybind11_vs_boost_python1.png
diff --git a/3rdparty/pybind11/docs/pybind11_vs_boost_python1.svg b/3rdparty/pybind11/docs/pybind11_vs_boost_python1.svg
new file mode 100644
index 00000000..5bf950e6
--- /dev/null
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diff --git a/3rdparty/pybind11/docs/reference.rst b/3rdparty/pybind11/docs/reference.rst
new file mode 100644
index 00000000..a9fbe600
--- /dev/null
+++ b/3rdparty/pybind11/docs/reference.rst
@@ -0,0 +1,117 @@
+.. _reference:
+
+.. warning::
+
+    Please be advised that the reference documentation discussing pybind11
+    internals is currently incomplete. Please refer to the previous sections
+    and the pybind11 header files for the nitty gritty details.
+
+Reference
+#########
+
+.. _macros:
+
+Macros
+======
+
+.. doxygendefine:: PYBIND11_MODULE
+
+.. _core_types:
+
+Convenience classes for arbitrary Python types
+==============================================
+
+Common member functions
+-----------------------
+
+.. doxygenclass:: object_api
+    :members:
+
+Without reference counting
+--------------------------
+
+.. doxygenclass:: handle
+    :members:
+
+With reference counting
+-----------------------
+
+.. doxygenclass:: object
+    :members:
+
+.. doxygenfunction:: reinterpret_borrow
+
+.. doxygenfunction:: reinterpret_steal
+
+Convenience classes for specific Python types
+=============================================
+
+.. doxygenclass:: module
+    :members:
+
+.. doxygengroup:: pytypes
+    :members:
+
+.. _extras:
+
+Passing extra arguments to ``def`` or ``class_``
+================================================
+
+.. doxygengroup:: annotations
+    :members:
+
+Embedding the interpreter
+=========================
+
+.. doxygendefine:: PYBIND11_EMBEDDED_MODULE
+
+.. doxygenfunction:: initialize_interpreter
+
+.. doxygenfunction:: finalize_interpreter
+
+.. doxygenclass:: scoped_interpreter
+
+Redirecting C++ streams
+=======================
+
+.. doxygenclass:: scoped_ostream_redirect
+
+.. doxygenclass:: scoped_estream_redirect
+
+.. doxygenfunction:: add_ostream_redirect
+
+Python built-in functions
+=========================
+
+.. doxygengroup:: python_builtins
+    :members:
+
+Inheritance
+===========
+
+See :doc:`/classes` and :doc:`/advanced/classes` for more detail.
+
+.. doxygendefine:: PYBIND11_OVERLOAD
+
+.. doxygendefine:: PYBIND11_OVERLOAD_PURE
+
+.. doxygendefine:: PYBIND11_OVERLOAD_NAME
+
+.. doxygendefine:: PYBIND11_OVERLOAD_PURE_NAME
+
+.. doxygenfunction:: get_overload
+
+Exceptions
+==========
+
+.. doxygenclass:: error_already_set
+    :members:
+
+.. doxygenclass:: builtin_exception
+    :members:
+
+
+Literals
+========
+
+.. doxygennamespace:: literals
diff --git a/3rdparty/pybind11/docs/release.rst b/3rdparty/pybind11/docs/release.rst
new file mode 100644
index 00000000..9846f971
--- /dev/null
+++ b/3rdparty/pybind11/docs/release.rst
@@ -0,0 +1,21 @@
+To release a new version of pybind11:
+
+- Update the version number and push to pypi
+    - Update ``pybind11/_version.py`` (set release version, remove 'dev').
+    - Update ``PYBIND11_VERSION_MAJOR`` etc. in ``include/pybind11/detail/common.h``.
+    - Ensure that all the information in ``setup.py`` is up-to-date.
+    - Update version in ``docs/conf.py``.
+    - Tag release date in ``docs/changelog.rst``.
+    - ``git add`` and ``git commit``.
+    - if new minor version: ``git checkout -b vX.Y``, ``git push -u origin vX.Y``
+    - ``git tag -a vX.Y.Z -m 'vX.Y.Z release'``.
+    - ``git push``
+    - ``git push --tags``.
+    - ``python setup.py sdist upload``.
+    - ``python setup.py bdist_wheel upload``.
+- Get back to work
+    - Update ``_version.py`` (add 'dev' and increment minor).
+    - Update version in ``docs/conf.py``
+    - Update version macros in ``include/pybind11/common.h``
+    - ``git add`` and ``git commit``.
+      ``git push``
diff --git a/3rdparty/pybind11/docs/requirements.txt b/3rdparty/pybind11/docs/requirements.txt
new file mode 100644
index 00000000..3818fe80
--- /dev/null
+++ b/3rdparty/pybind11/docs/requirements.txt
@@ -0,0 +1 @@
+breathe == 4.5.0
diff --git a/3rdparty/pybind11/docs/upgrade.rst b/3rdparty/pybind11/docs/upgrade.rst
new file mode 100644
index 00000000..3f569739
--- /dev/null
+++ b/3rdparty/pybind11/docs/upgrade.rst
@@ -0,0 +1,404 @@
+Upgrade guide
+#############
+
+This is a companion guide to the :doc:`changelog`. While the changelog briefly
+lists all of the new features, improvements and bug fixes, this upgrade guide
+focuses only the subset which directly impacts your experience when upgrading
+to a new version. But it goes into more detail. This includes things like
+deprecated APIs and their replacements, build system changes, general code
+modernization and other useful information.
+
+
+v2.2
+====
+
+Deprecation of the ``PYBIND11_PLUGIN`` macro
+--------------------------------------------
+
+``PYBIND11_MODULE`` is now the preferred way to create module entry points.
+The old macro emits a compile-time deprecation warning.
+
+.. code-block:: cpp
+
+    // old
+    PYBIND11_PLUGIN(example) {
+        py::module m("example", "documentation string");
+
+        m.def("add", [](int a, int b) { return a + b; });
+
+        return m.ptr();
+    }
+
+    // new
+    PYBIND11_MODULE(example, m) {
+        m.doc() = "documentation string"; // optional
+
+        m.def("add", [](int a, int b) { return a + b; });
+    }
+
+
+New API for defining custom constructors and pickling functions
+---------------------------------------------------------------
+
+The old placement-new custom constructors have been deprecated. The new approach
+uses ``py::init()`` and factory functions to greatly improve type safety.
+
+Placement-new can be called accidentally with an incompatible type (without any
+compiler errors or warnings), or it can initialize the same object multiple times
+if not careful with the Python-side ``__init__`` calls. The new-style custom
+constructors prevent such mistakes. See :ref:`custom_constructors` for details.
+
+.. code-block:: cpp
+
+    // old -- deprecated (runtime warning shown only in debug mode)
+    py::class<Foo>(m, "Foo")
+        .def("__init__", [](Foo &self, ...) {
+            new (&self) Foo(...); // uses placement-new
+        });
+
+    // new
+    py::class<Foo>(m, "Foo")
+        .def(py::init([](...) { // Note: no `self` argument
+            return new Foo(...); // return by raw pointer
+            // or: return std::make_unique<Foo>(...); // return by holder
+            // or: return Foo(...); // return by value (move constructor)
+        }));
+
+Mirroring the custom constructor changes, ``py::pickle()`` is now the preferred
+way to get and set object state. See :ref:`pickling` for details.
+
+.. code-block:: cpp
+
+    // old -- deprecated (runtime warning shown only in debug mode)
+    py::class<Foo>(m, "Foo")
+        ...
+        .def("__getstate__", [](const Foo &self) {
+            return py::make_tuple(self.value1(), self.value2(), ...);
+        })
+        .def("__setstate__", [](Foo &self, py::tuple t) {
+            new (&self) Foo(t[0].cast<std::string>(), ...);
+        });
+
+    // new
+    py::class<Foo>(m, "Foo")
+        ...
+        .def(py::pickle(
+            [](const Foo &self) { // __getstate__
+                return py::make_tuple(f.value1(), f.value2(), ...); // unchanged
+            },
+            [](py::tuple t) { // __setstate__, note: no `self` argument
+                return new Foo(t[0].cast<std::string>(), ...);
+                // or: return std::make_unique<Foo>(...); // return by holder
+                // or: return Foo(...); // return by value (move constructor)
+            }
+        ));
+
+For both the constructors and pickling, warnings are shown at module
+initialization time (on import, not when the functions are called).
+They're only visible when compiled in debug mode. Sample warning:
+
+.. code-block:: none
+
+    pybind11-bound class 'mymodule.Foo' is using an old-style placement-new '__init__'
+    which has been deprecated. See the upgrade guide in pybind11's docs.
+
+
+Stricter enforcement of hidden symbol visibility for pybind11 modules
+---------------------------------------------------------------------
+
+pybind11 now tries to actively enforce hidden symbol visibility for modules.
+If you're using either one of pybind11's :doc:`CMake or Python build systems
+<compiling>` (the two example repositories) and you haven't been exporting any
+symbols, there's nothing to be concerned about. All the changes have been done
+transparently in the background. If you were building manually or relied on
+specific default visibility, read on.
+
+Setting default symbol visibility to *hidden* has always been recommended for
+pybind11 (see :ref:`faq:symhidden`). On Linux and macOS, hidden symbol
+visibility (in conjunction with the ``strip`` utility) yields much smaller
+module binaries. `CPython's extension docs`_ also recommend hiding symbols
+by default, with the goal of avoiding symbol name clashes between modules.
+Starting with v2.2, pybind11 enforces this more strictly: (1) by declaring
+all symbols inside the ``pybind11`` namespace as hidden and (2) by including
+the ``-fvisibility=hidden`` flag on Linux and macOS (only for extension
+modules, not for embedding the interpreter).
+
+.. _CPython's extension docs: https://docs.python.org/3/extending/extending.html#providing-a-c-api-for-an-extension-module
+
+The namespace-scope hidden visibility is done automatically in pybind11's
+headers and it's generally transparent to users. It ensures that:
+
+* Modules compiled with different pybind11 versions don't clash with each other.
+
+* Some new features, like ``py::module_local`` bindings, can work as intended.
+
+The ``-fvisibility=hidden`` flag applies the same visibility to user bindings
+outside of the ``pybind11`` namespace. It's now set automatic by pybind11's
+CMake and Python build systems, but this needs to be done manually by users
+of other build systems. Adding this flag:
+
+* Minimizes the chances of symbol conflicts between modules. E.g. if two
+  unrelated modules were statically linked to different (ABI-incompatible)
+  versions of the same third-party library, a symbol clash would be likely
+  (and would end with unpredictable results).
+
+* Produces smaller binaries on Linux and macOS, as pointed out previously.
+
+Within pybind11's CMake build system, ``pybind11_add_module`` has always been
+setting the ``-fvisibility=hidden`` flag in release mode. From now on, it's
+being applied unconditionally, even in debug mode and it can no longer be opted
+out of with the ``NO_EXTRAS`` option. The ``pybind11::module`` target now also
+adds this flag to it's interface. The ``pybind11::embed`` target is unchanged.
+
+The most significant change here is for the ``pybind11::module`` target. If you
+were previously relying on default visibility, i.e. if your Python module was
+doubling as a shared library with dependents, you'll need to either export
+symbols manually (recommended for cross-platform libraries) or factor out the
+shared library (and have the Python module link to it like the other
+dependents). As a temporary workaround, you can also restore default visibility
+using the CMake code below, but this is not recommended in the long run:
+
+.. code-block:: cmake
+
+    target_link_libraries(mymodule PRIVATE pybind11::module)
+
+    add_library(restore_default_visibility INTERFACE)
+    target_compile_options(restore_default_visibility INTERFACE -fvisibility=default)
+    target_link_libraries(mymodule PRIVATE restore_default_visibility)
+
+
+Local STL container bindings
+----------------------------
+
+Previous pybind11 versions could only bind types globally -- all pybind11
+modules, even unrelated ones, would have access to the same exported types.
+However, this would also result in a conflict if two modules exported the
+same C++ type, which is especially problematic for very common types, e.g.
+``std::vector<int>``. :ref:`module_local` were added to resolve this (see
+that section for a complete usage guide).
+
+``py::class_`` still defaults to global bindings (because these types are
+usually unique across modules), however in order to avoid clashes of opaque
+types, ``py::bind_vector`` and ``py::bind_map`` will now bind STL containers
+as ``py::module_local`` if their elements are: builtins (``int``, ``float``,
+etc.), not bound using ``py::class_``, or bound as ``py::module_local``. For
+example, this change allows multiple modules to bind ``std::vector<int>``
+without causing conflicts. See :ref:`stl_bind` for more details.
+
+When upgrading to this version, if you have multiple modules which depend on
+a single global binding of an STL container, note that all modules can still
+accept foreign  ``py::module_local`` types in the direction of Python-to-C++.
+The locality only affects the C++-to-Python direction. If this is needed in
+multiple modules, you'll need to either:
+
+* Add a copy of the same STL binding to all of the modules which need it.
+
+* Restore the global status of that single binding by marking it
+  ``py::module_local(false)``.
+
+The latter is an easy workaround, but in the long run it would be best to
+localize all common type bindings in order to avoid conflicts with
+third-party modules.
+
+
+Negative strides for Python buffer objects and numpy arrays
+-----------------------------------------------------------
+
+Support for negative strides required changing the integer type from unsigned
+to signed in the interfaces of ``py::buffer_info`` and ``py::array``. If you
+have compiler warnings enabled, you may notice some new conversion warnings
+after upgrading. These can be resolved using ``static_cast``.
+
+
+Deprecation of some ``py::object`` APIs
+---------------------------------------
+
+To compare ``py::object`` instances by pointer, you should now use
+``obj1.is(obj2)`` which is equivalent to ``obj1 is obj2`` in Python.
+Previously, pybind11 used ``operator==`` for this (``obj1 == obj2``), but
+that could be confusing and is now deprecated (so that it can eventually
+be replaced with proper rich object comparison in a future release).
+
+For classes which inherit from ``py::object``, ``borrowed`` and ``stolen``
+were previously available as protected constructor tags. Now the types
+should be used directly instead: ``borrowed_t{}`` and ``stolen_t{}``
+(`#771 <https://github.com/pybind/pybind11/pull/771>`_).
+
+
+Stricter compile-time error checking
+------------------------------------
+
+Some error checks have been moved from run time to compile time. Notably,
+automatic conversion of ``std::shared_ptr<T>`` is not possible when ``T`` is
+not directly registered with ``py::class_<T>`` (e.g. ``std::shared_ptr<int>``
+or ``std::shared_ptr<std::vector<T>>`` are not automatically convertible).
+Attempting to bind a function with such arguments now results in a compile-time
+error instead of waiting to fail at run time.
+
+``py::init<...>()`` constructor definitions are also stricter and now prevent
+bindings which could cause unexpected behavior:
+
+.. code-block:: cpp
+
+    struct Example {
+        Example(int &);
+    };
+
+    py::class_<Example>(m, "Example")
+        .def(py::init<int &>()); // OK, exact match
+        // .def(py::init<int>()); // compile-time error, mismatch
+
+A non-``const`` lvalue reference is not allowed to bind to an rvalue. However,
+note that a constructor taking ``const T &`` can still be registered using
+``py::init<T>()`` because a ``const`` lvalue reference can bind to an rvalue.
+
+v2.1
+====
+
+Minimum compiler versions are enforced at compile time
+------------------------------------------------------
+
+The minimums also apply to v2.0 but the check is now explicit and a compile-time
+error is raised if the compiler does not meet the requirements:
+
+* GCC >= 4.8
+* clang >= 3.3 (appleclang >= 5.0)
+* MSVC >= 2015u3
+* Intel C++ >= 15.0
+
+
+The ``py::metaclass`` attribute is not required for static properties
+---------------------------------------------------------------------
+
+Binding classes with static properties is now possible by default. The
+zero-parameter version of ``py::metaclass()`` is deprecated. However, a new
+one-parameter ``py::metaclass(python_type)`` version was added for rare
+cases when a custom metaclass is needed to override pybind11's default.
+
+.. code-block:: cpp
+
+    // old -- emits a deprecation warning
+    py::class_<Foo>(m, "Foo", py::metaclass())
+        .def_property_readonly_static("foo", ...);
+
+    // new -- static properties work without the attribute
+    py::class_<Foo>(m, "Foo")
+        .def_property_readonly_static("foo", ...);
+
+    // new -- advanced feature, override pybind11's default metaclass
+    py::class_<Bar>(m, "Bar", py::metaclass(custom_python_type))
+        ...
+
+
+v2.0
+====
+
+Breaking changes in ``py::class_``
+----------------------------------
+
+These changes were necessary to make type definitions in pybind11
+future-proof, to support PyPy via its ``cpyext`` mechanism (`#527
+<https://github.com/pybind/pybind11/pull/527>`_), and to improve efficiency
+(`rev. 86d825 <https://github.com/pybind/pybind11/commit/86d825>`_).
+
+1. Declarations of types that provide access via the buffer protocol must
+   now include the ``py::buffer_protocol()`` annotation as an argument to
+   the ``py::class_`` constructor.
+
+   .. code-block:: cpp
+
+       py::class_<Matrix>("Matrix", py::buffer_protocol())
+           .def(py::init<...>())
+           .def_buffer(...);
+
+2. Classes which include static properties (e.g. ``def_readwrite_static()``)
+   must now include the ``py::metaclass()`` attribute. Note: this requirement
+   has since been removed in v2.1. If you're upgrading from 1.x, it's
+   recommended to skip directly to v2.1 or newer.
+
+3. This version of pybind11 uses a redesigned mechanism for instantiating
+   trampoline classes that are used to override virtual methods from within
+   Python. This led to the following user-visible syntax change:
+
+   .. code-block:: cpp
+
+       // old v1.x syntax
+       py::class_<TrampolineClass>("MyClass")
+           .alias<MyClass>()
+           ...
+
+       // new v2.x syntax
+       py::class_<MyClass, TrampolineClass>("MyClass")
+           ...
+
+   Importantly, both the original and the trampoline class are now specified
+   as arguments to the ``py::class_`` template, and the ``alias<..>()`` call
+   is gone. The new scheme has zero overhead in cases when Python doesn't
+   override any functions of the underlying C++ class.
+   `rev. 86d825 <https://github.com/pybind/pybind11/commit/86d825>`_.
+
+   The class type must be the first template argument given to ``py::class_``
+   while the trampoline can be mixed in arbitrary order with other arguments
+   (see the following section).
+
+
+Deprecation of the ``py::base<T>()`` attribute
+----------------------------------------------
+
+``py::base<T>()`` was deprecated in favor of specifying ``T`` as a template
+argument to ``py::class_``. This new syntax also supports multiple inheritance.
+Note that, while the type being exported must be the first argument in the
+``py::class_<Class, ...>`` template, the order of the following types (bases,
+holder and/or trampoline) is not important.
+
+.. code-block:: cpp
+
+    // old v1.x
+    py::class_<Derived>("Derived", py::base<Base>());
+
+    // new v2.x
+    py::class_<Derived, Base>("Derived");
+
+    // new -- multiple inheritance
+    py::class_<Derived, Base1, Base2>("Derived");
+
+    // new -- apart from `Derived` the argument order can be arbitrary
+    py::class_<Derived, Base1, Holder, Base2, Trampoline>("Derived");
+
+
+Out-of-the-box support for ``std::shared_ptr``
+----------------------------------------------
+
+The relevant type caster is now built in, so it's no longer necessary to
+include a declaration of the form:
+
+.. code-block:: cpp
+
+    PYBIND11_DECLARE_HOLDER_TYPE(T, std::shared_ptr<T>)
+
+Continuing to do so won’t cause an error or even a deprecation warning,
+but it's completely redundant.
+
+
+Deprecation of a few ``py::object`` APIs
+----------------------------------------
+
+All of the old-style calls emit deprecation warnings.
+
++---------------------------------------+---------------------------------------------+
+|  Old syntax                           |  New syntax                                 |
++=======================================+=============================================+
+| ``obj.call(args...)``                 | ``obj(args...)``                            |
++---------------------------------------+---------------------------------------------+
+| ``obj.str()``                         | ``py::str(obj)``                            |
++---------------------------------------+---------------------------------------------+
+| ``auto l = py::list(obj); l.check()`` | ``py::isinstance<py::list>(obj)``           |
++---------------------------------------+---------------------------------------------+
+| ``py::object(ptr, true)``             | ``py::reinterpret_borrow<py::object>(ptr)`` |
++---------------------------------------+---------------------------------------------+
+| ``py::object(ptr, false)``            | ``py::reinterpret_steal<py::object>(ptr)``  |
++---------------------------------------+---------------------------------------------+
+| ``if (obj.attr("foo"))``              | ``if (py::hasattr(obj, "foo"))``            |
++---------------------------------------+---------------------------------------------+
+| ``if (obj["bar"])``                   | ``if (obj.contains("bar"))``                |
++---------------------------------------+---------------------------------------------+
diff --git a/3rdparty/pybind11/include/pybind11/attr.h b/3rdparty/pybind11/include/pybind11/attr.h
new file mode 100644
index 00000000..6962d6fc
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/attr.h
@@ -0,0 +1,493 @@
+/*
+    pybind11/attr.h: Infrastructure for processing custom
+    type and function attributes
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "cast.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+/// \addtogroup annotations
+/// @{
+
+/// Annotation for methods
+struct is_method { handle class_; is_method(const handle &c) : class_(c) { } };
+
+/// Annotation for operators
+struct is_operator { };
+
+/// Annotation for parent scope
+struct scope { handle value; scope(const handle &s) : value(s) { } };
+
+/// Annotation for documentation
+struct doc { const char *value; doc(const char *value) : value(value) { } };
+
+/// Annotation for function names
+struct name { const char *value; name(const char *value) : value(value) { } };
+
+/// Annotation indicating that a function is an overload associated with a given "sibling"
+struct sibling { handle value; sibling(const handle &value) : value(value.ptr()) { } };
+
+/// Annotation indicating that a class derives from another given type
+template <typename T> struct base {
+    PYBIND11_DEPRECATED("base<T>() was deprecated in favor of specifying 'T' as a template argument to class_")
+    base() { }
+};
+
+/// Keep patient alive while nurse lives
+template <size_t Nurse, size_t Patient> struct keep_alive { };
+
+/// Annotation indicating that a class is involved in a multiple inheritance relationship
+struct multiple_inheritance { };
+
+/// Annotation which enables dynamic attributes, i.e. adds `__dict__` to a class
+struct dynamic_attr { };
+
+/// Annotation which enables the buffer protocol for a type
+struct buffer_protocol { };
+
+/// Annotation which requests that a special metaclass is created for a type
+struct metaclass {
+    handle value;
+
+    PYBIND11_DEPRECATED("py::metaclass() is no longer required. It's turned on by default now.")
+    metaclass() {}
+
+    /// Override pybind11's default metaclass
+    explicit metaclass(handle value) : value(value) { }
+};
+
+/// Annotation that marks a class as local to the module:
+struct module_local { const bool value; constexpr module_local(bool v = true) : value(v) { } };
+
+/// Annotation to mark enums as an arithmetic type
+struct arithmetic { };
+
+/** \rst
+    A call policy which places one or more guard variables (``Ts...``) around the function call.
+
+    For example, this definition:
+
+    .. code-block:: cpp
+
+        m.def("foo", foo, py::call_guard<T>());
+
+    is equivalent to the following pseudocode:
+
+    .. code-block:: cpp
+
+        m.def("foo", [](args...) {
+            T scope_guard;
+            return foo(args...); // forwarded arguments
+        });
+ \endrst */
+template <typename... Ts> struct call_guard;
+
+template <> struct call_guard<> { using type = detail::void_type; };
+
+template <typename T>
+struct call_guard<T> {
+    static_assert(std::is_default_constructible<T>::value,
+                  "The guard type must be default constructible");
+
+    using type = T;
+};
+
+template <typename T, typename... Ts>
+struct call_guard<T, Ts...> {
+    struct type {
+        T guard{}; // Compose multiple guard types with left-to-right default-constructor order
+        typename call_guard<Ts...>::type next{};
+    };
+};
+
+/// @} annotations
+
+NAMESPACE_BEGIN(detail)
+/* Forward declarations */
+enum op_id : int;
+enum op_type : int;
+struct undefined_t;
+template <op_id id, op_type ot, typename L = undefined_t, typename R = undefined_t> struct op_;
+inline void keep_alive_impl(size_t Nurse, size_t Patient, function_call &call, handle ret);
+
+/// Internal data structure which holds metadata about a keyword argument
+struct argument_record {
+    const char *name;  ///< Argument name
+    const char *descr; ///< Human-readable version of the argument value
+    handle value;      ///< Associated Python object
+    bool convert : 1;  ///< True if the argument is allowed to convert when loading
+    bool none : 1;     ///< True if None is allowed when loading
+
+    argument_record(const char *name, const char *descr, handle value, bool convert, bool none)
+        : name(name), descr(descr), value(value), convert(convert), none(none) { }
+};
+
+/// Internal data structure which holds metadata about a bound function (signature, overloads, etc.)
+struct function_record {
+    function_record()
+        : is_constructor(false), is_new_style_constructor(false), is_stateless(false),
+          is_operator(false), has_args(false), has_kwargs(false), is_method(false) { }
+
+    /// Function name
+    char *name = nullptr; /* why no C++ strings? They generate heavier code.. */
+
+    // User-specified documentation string
+    char *doc = nullptr;
+
+    /// Human-readable version of the function signature
+    char *signature = nullptr;
+
+    /// List of registered keyword arguments
+    std::vector<argument_record> args;
+
+    /// Pointer to lambda function which converts arguments and performs the actual call
+    handle (*impl) (function_call &) = nullptr;
+
+    /// Storage for the wrapped function pointer and captured data, if any
+    void *data[3] = { };
+
+    /// Pointer to custom destructor for 'data' (if needed)
+    void (*free_data) (function_record *ptr) = nullptr;
+
+    /// Return value policy associated with this function
+    return_value_policy policy = return_value_policy::automatic;
+
+    /// True if name == '__init__'
+    bool is_constructor : 1;
+
+    /// True if this is a new-style `__init__` defined in `detail/init.h`
+    bool is_new_style_constructor : 1;
+
+    /// True if this is a stateless function pointer
+    bool is_stateless : 1;
+
+    /// True if this is an operator (__add__), etc.
+    bool is_operator : 1;
+
+    /// True if the function has a '*args' argument
+    bool has_args : 1;
+
+    /// True if the function has a '**kwargs' argument
+    bool has_kwargs : 1;
+
+    /// True if this is a method
+    bool is_method : 1;
+
+    /// Number of arguments (including py::args and/or py::kwargs, if present)
+    std::uint16_t nargs;
+
+    /// Python method object
+    PyMethodDef *def = nullptr;
+
+    /// Python handle to the parent scope (a class or a module)
+    handle scope;
+
+    /// Python handle to the sibling function representing an overload chain
+    handle sibling;
+
+    /// Pointer to next overload
+    function_record *next = nullptr;
+};
+
+/// Special data structure which (temporarily) holds metadata about a bound class
+struct type_record {
+    PYBIND11_NOINLINE type_record()
+        : multiple_inheritance(false), dynamic_attr(false), buffer_protocol(false),
+          default_holder(true), module_local(false) { }
+
+    /// Handle to the parent scope
+    handle scope;
+
+    /// Name of the class
+    const char *name = nullptr;
+
+    // Pointer to RTTI type_info data structure
+    const std::type_info *type = nullptr;
+
+    /// How large is the underlying C++ type?
+    size_t type_size = 0;
+
+    /// What is the alignment of the underlying C++ type?
+    size_t type_align = 0;
+
+    /// How large is the type's holder?
+    size_t holder_size = 0;
+
+    /// The global operator new can be overridden with a class-specific variant
+    void *(*operator_new)(size_t) = nullptr;
+
+    /// Function pointer to class_<..>::init_instance
+    void (*init_instance)(instance *, const void *) = nullptr;
+
+    /// Function pointer to class_<..>::dealloc
+    void (*dealloc)(detail::value_and_holder &) = nullptr;
+
+    /// List of base classes of the newly created type
+    list bases;
+
+    /// Optional docstring
+    const char *doc = nullptr;
+
+    /// Custom metaclass (optional)
+    handle metaclass;
+
+    /// Multiple inheritance marker
+    bool multiple_inheritance : 1;
+
+    /// Does the class manage a __dict__?
+    bool dynamic_attr : 1;
+
+    /// Does the class implement the buffer protocol?
+    bool buffer_protocol : 1;
+
+    /// Is the default (unique_ptr) holder type used?
+    bool default_holder : 1;
+
+    /// Is the class definition local to the module shared object?
+    bool module_local : 1;
+
+    PYBIND11_NOINLINE void add_base(const std::type_info &base, void *(*caster)(void *)) {
+        auto base_info = detail::get_type_info(base, false);
+        if (!base_info) {
+            std::string tname(base.name());
+            detail::clean_type_id(tname);
+            pybind11_fail("generic_type: type \"" + std::string(name) +
+                          "\" referenced unknown base type \"" + tname + "\"");
+        }
+
+        if (default_holder != base_info->default_holder) {
+            std::string tname(base.name());
+            detail::clean_type_id(tname);
+            pybind11_fail("generic_type: type \"" + std::string(name) + "\" " +
+                    (default_holder ? "does not have" : "has") +
+                    " a non-default holder type while its base \"" + tname + "\" " +
+                    (base_info->default_holder ? "does not" : "does"));
+        }
+
+        bases.append((PyObject *) base_info->type);
+
+        if (base_info->type->tp_dictoffset != 0)
+            dynamic_attr = true;
+
+        if (caster)
+            base_info->implicit_casts.emplace_back(type, caster);
+    }
+};
+
+inline function_call::function_call(const function_record &f, handle p) :
+        func(f), parent(p) {
+    args.reserve(f.nargs);
+    args_convert.reserve(f.nargs);
+}
+
+/// Tag for a new-style `__init__` defined in `detail/init.h`
+struct is_new_style_constructor { };
+
+/**
+ * Partial template specializations to process custom attributes provided to
+ * cpp_function_ and class_. These are either used to initialize the respective
+ * fields in the type_record and function_record data structures or executed at
+ * runtime to deal with custom call policies (e.g. keep_alive).
+ */
+template <typename T, typename SFINAE = void> struct process_attribute;
+
+template <typename T> struct process_attribute_default {
+    /// Default implementation: do nothing
+    static void init(const T &, function_record *) { }
+    static void init(const T &, type_record *) { }
+    static void precall(function_call &) { }
+    static void postcall(function_call &, handle) { }
+};
+
+/// Process an attribute specifying the function's name
+template <> struct process_attribute<name> : process_attribute_default<name> {
+    static void init(const name &n, function_record *r) { r->name = const_cast<char *>(n.value); }
+};
+
+/// Process an attribute specifying the function's docstring
+template <> struct process_attribute<doc> : process_attribute_default<doc> {
+    static void init(const doc &n, function_record *r) { r->doc = const_cast<char *>(n.value); }
+};
+
+/// Process an attribute specifying the function's docstring (provided as a C-style string)
+template <> struct process_attribute<const char *> : process_attribute_default<const char *> {
+    static void init(const char *d, function_record *r) { r->doc = const_cast<char *>(d); }
+    static void init(const char *d, type_record *r) { r->doc = const_cast<char *>(d); }
+};
+template <> struct process_attribute<char *> : process_attribute<const char *> { };
+
+/// Process an attribute indicating the function's return value policy
+template <> struct process_attribute<return_value_policy> : process_attribute_default<return_value_policy> {
+    static void init(const return_value_policy &p, function_record *r) { r->policy = p; }
+};
+
+/// Process an attribute which indicates that this is an overloaded function associated with a given sibling
+template <> struct process_attribute<sibling> : process_attribute_default<sibling> {
+    static void init(const sibling &s, function_record *r) { r->sibling = s.value; }
+};
+
+/// Process an attribute which indicates that this function is a method
+template <> struct process_attribute<is_method> : process_attribute_default<is_method> {
+    static void init(const is_method &s, function_record *r) { r->is_method = true; r->scope = s.class_; }
+};
+
+/// Process an attribute which indicates the parent scope of a method
+template <> struct process_attribute<scope> : process_attribute_default<scope> {
+    static void init(const scope &s, function_record *r) { r->scope = s.value; }
+};
+
+/// Process an attribute which indicates that this function is an operator
+template <> struct process_attribute<is_operator> : process_attribute_default<is_operator> {
+    static void init(const is_operator &, function_record *r) { r->is_operator = true; }
+};
+
+template <> struct process_attribute<is_new_style_constructor> : process_attribute_default<is_new_style_constructor> {
+    static void init(const is_new_style_constructor &, function_record *r) { r->is_new_style_constructor = true; }
+};
+
+/// Process a keyword argument attribute (*without* a default value)
+template <> struct process_attribute<arg> : process_attribute_default<arg> {
+    static void init(const arg &a, function_record *r) {
+        if (r->is_method && r->args.empty())
+            r->args.emplace_back("self", nullptr, handle(), true /*convert*/, false /*none not allowed*/);
+        r->args.emplace_back(a.name, nullptr, handle(), !a.flag_noconvert, a.flag_none);
+    }
+};
+
+/// Process a keyword argument attribute (*with* a default value)
+template <> struct process_attribute<arg_v> : process_attribute_default<arg_v> {
+    static void init(const arg_v &a, function_record *r) {
+        if (r->is_method && r->args.empty())
+            r->args.emplace_back("self", nullptr /*descr*/, handle() /*parent*/, true /*convert*/, false /*none not allowed*/);
+
+        if (!a.value) {
+#if !defined(NDEBUG)
+            std::string descr("'");
+            if (a.name) descr += std::string(a.name) + ": ";
+            descr += a.type + "'";
+            if (r->is_method) {
+                if (r->name)
+                    descr += " in method '" + (std::string) str(r->scope) + "." + (std::string) r->name + "'";
+                else
+                    descr += " in method of '" + (std::string) str(r->scope) + "'";
+            } else if (r->name) {
+                descr += " in function '" + (std::string) r->name + "'";
+            }
+            pybind11_fail("arg(): could not convert default argument "
+                          + descr + " into a Python object (type not registered yet?)");
+#else
+            pybind11_fail("arg(): could not convert default argument "
+                          "into a Python object (type not registered yet?). "
+                          "Compile in debug mode for more information.");
+#endif
+        }
+        r->args.emplace_back(a.name, a.descr, a.value.inc_ref(), !a.flag_noconvert, a.flag_none);
+    }
+};
+
+/// Process a parent class attribute.  Single inheritance only (class_ itself already guarantees that)
+template <typename T>
+struct process_attribute<T, enable_if_t<is_pyobject<T>::value>> : process_attribute_default<handle> {
+    static void init(const handle &h, type_record *r) { r->bases.append(h); }
+};
+
+/// Process a parent class attribute (deprecated, does not support multiple inheritance)
+template <typename T>
+struct process_attribute<base<T>> : process_attribute_default<base<T>> {
+    static void init(const base<T> &, type_record *r) { r->add_base(typeid(T), nullptr); }
+};
+
+/// Process a multiple inheritance attribute
+template <>
+struct process_attribute<multiple_inheritance> : process_attribute_default<multiple_inheritance> {
+    static void init(const multiple_inheritance &, type_record *r) { r->multiple_inheritance = true; }
+};
+
+template <>
+struct process_attribute<dynamic_attr> : process_attribute_default<dynamic_attr> {
+    static void init(const dynamic_attr &, type_record *r) { r->dynamic_attr = true; }
+};
+
+template <>
+struct process_attribute<buffer_protocol> : process_attribute_default<buffer_protocol> {
+    static void init(const buffer_protocol &, type_record *r) { r->buffer_protocol = true; }
+};
+
+template <>
+struct process_attribute<metaclass> : process_attribute_default<metaclass> {
+    static void init(const metaclass &m, type_record *r) { r->metaclass = m.value; }
+};
+
+template <>
+struct process_attribute<module_local> : process_attribute_default<module_local> {
+    static void init(const module_local &l, type_record *r) { r->module_local = l.value; }
+};
+
+/// Process an 'arithmetic' attribute for enums (does nothing here)
+template <>
+struct process_attribute<arithmetic> : process_attribute_default<arithmetic> {};
+
+template <typename... Ts>
+struct process_attribute<call_guard<Ts...>> : process_attribute_default<call_guard<Ts...>> { };
+
+/**
+ * Process a keep_alive call policy -- invokes keep_alive_impl during the
+ * pre-call handler if both Nurse, Patient != 0 and use the post-call handler
+ * otherwise
+ */
+template <size_t Nurse, size_t Patient> struct process_attribute<keep_alive<Nurse, Patient>> : public process_attribute_default<keep_alive<Nurse, Patient>> {
+    template <size_t N = Nurse, size_t P = Patient, enable_if_t<N != 0 && P != 0, int> = 0>
+    static void precall(function_call &call) { keep_alive_impl(Nurse, Patient, call, handle()); }
+    template <size_t N = Nurse, size_t P = Patient, enable_if_t<N != 0 && P != 0, int> = 0>
+    static void postcall(function_call &, handle) { }
+    template <size_t N = Nurse, size_t P = Patient, enable_if_t<N == 0 || P == 0, int> = 0>
+    static void precall(function_call &) { }
+    template <size_t N = Nurse, size_t P = Patient, enable_if_t<N == 0 || P == 0, int> = 0>
+    static void postcall(function_call &call, handle ret) { keep_alive_impl(Nurse, Patient, call, ret); }
+};
+
+/// Recursively iterate over variadic template arguments
+template <typename... Args> struct process_attributes {
+    static void init(const Args&... args, function_record *r) {
+        int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::init(args, r), 0) ... };
+        ignore_unused(unused);
+    }
+    static void init(const Args&... args, type_record *r) {
+        int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::init(args, r), 0) ... };
+        ignore_unused(unused);
+    }
+    static void precall(function_call &call) {
+        int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };
+        ignore_unused(unused);
+    }
+    static void postcall(function_call &call, handle fn_ret) {
+        int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::postcall(call, fn_ret), 0) ... };
+        ignore_unused(unused);
+    }
+};
+
+template <typename T>
+using is_call_guard = is_instantiation<call_guard, T>;
+
+/// Extract the ``type`` from the first `call_guard` in `Extras...` (or `void_type` if none found)
+template <typename... Extra>
+using extract_guard_t = typename exactly_one_t<is_call_guard, call_guard<>, Extra...>::type;
+
+/// Check the number of named arguments at compile time
+template <typename... Extra,
+          size_t named = constexpr_sum(std::is_base_of<arg, Extra>::value...),
+          size_t self  = constexpr_sum(std::is_same<is_method, Extra>::value...)>
+constexpr bool expected_num_args(size_t nargs, bool has_args, bool has_kwargs) {
+    return named == 0 || (self + named + has_args + has_kwargs) == nargs;
+}
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/buffer_info.h b/3rdparty/pybind11/include/pybind11/buffer_info.h
new file mode 100644
index 00000000..1f4115a1
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/buffer_info.h
@@ -0,0 +1,114 @@
+/*
+    pybind11/buffer_info.h: Python buffer object interface
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "detail/common.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+/// Information record describing a Python buffer object
+struct buffer_info {
+    void *ptr = nullptr;          // Pointer to the underlying storage
+    ssize_t itemsize = 0;         // Size of individual items in bytes
+    ssize_t size = 0;             // Total number of entries
+    std::string format;           // For homogeneous buffers, this should be set to format_descriptor<T>::format()
+    ssize_t ndim = 0;             // Number of dimensions
+    std::vector<ssize_t> shape;   // Shape of the tensor (1 entry per dimension)
+    std::vector<ssize_t> strides; // Number of bytes between adjacent entries (for each per dimension)
+    bool readonly = false;        // flag to indicate if the underlying storage may be written to
+
+    buffer_info() { }
+
+    buffer_info(void *ptr, ssize_t itemsize, const std::string &format, ssize_t ndim,
+                detail::any_container<ssize_t> shape_in, detail::any_container<ssize_t> strides_in, bool readonly=false)
+    : ptr(ptr), itemsize(itemsize), size(1), format(format), ndim(ndim),
+      shape(std::move(shape_in)), strides(std::move(strides_in)), readonly(readonly) {
+        if (ndim != (ssize_t) shape.size() || ndim != (ssize_t) strides.size())
+            pybind11_fail("buffer_info: ndim doesn't match shape and/or strides length");
+        for (size_t i = 0; i < (size_t) ndim; ++i)
+            size *= shape[i];
+    }
+
+    template <typename T>
+    buffer_info(T *ptr, detail::any_container<ssize_t> shape_in, detail::any_container<ssize_t> strides_in, bool readonly=false)
+    : buffer_info(private_ctr_tag(), ptr, sizeof(T), format_descriptor<T>::format(), static_cast<ssize_t>(shape_in->size()), std::move(shape_in), std::move(strides_in), readonly) { }
+
+    buffer_info(void *ptr, ssize_t itemsize, const std::string &format, ssize_t size, bool readonly=false)
+    : buffer_info(ptr, itemsize, format, 1, {size}, {itemsize}, readonly) { }
+
+    template <typename T>
+    buffer_info(T *ptr, ssize_t size, bool readonly=false)
+    : buffer_info(ptr, sizeof(T), format_descriptor<T>::format(), size, readonly) { }
+
+    template <typename T>
+    buffer_info(const T *ptr, ssize_t size, bool readonly=true)
+    : buffer_info(const_cast<T*>(ptr), sizeof(T), format_descriptor<T>::format(), size, readonly) { }
+
+    explicit buffer_info(Py_buffer *view, bool ownview = true)
+    : buffer_info(view->buf, view->itemsize, view->format, view->ndim,
+            {view->shape, view->shape + view->ndim}, {view->strides, view->strides + view->ndim}, view->readonly) {
+        this->view = view;
+        this->ownview = ownview;
+    }
+
+    buffer_info(const buffer_info &) = delete;
+    buffer_info& operator=(const buffer_info &) = delete;
+
+    buffer_info(buffer_info &&other) {
+        (*this) = std::move(other);
+    }
+
+    buffer_info& operator=(buffer_info &&rhs) {
+        ptr = rhs.ptr;
+        itemsize = rhs.itemsize;
+        size = rhs.size;
+        format = std::move(rhs.format);
+        ndim = rhs.ndim;
+        shape = std::move(rhs.shape);
+        strides = std::move(rhs.strides);
+        std::swap(view, rhs.view);
+        std::swap(ownview, rhs.ownview);
+        readonly = rhs.readonly;
+        return *this;
+    }
+
+    ~buffer_info() {
+        if (view && ownview) { PyBuffer_Release(view); delete view; }
+    }
+
+private:
+    struct private_ctr_tag { };
+
+    buffer_info(private_ctr_tag, void *ptr, ssize_t itemsize, const std::string &format, ssize_t ndim,
+                detail::any_container<ssize_t> &&shape_in, detail::any_container<ssize_t> &&strides_in, bool readonly)
+    : buffer_info(ptr, itemsize, format, ndim, std::move(shape_in), std::move(strides_in), readonly) { }
+
+    Py_buffer *view = nullptr;
+    bool ownview = false;
+};
+
+NAMESPACE_BEGIN(detail)
+
+template <typename T, typename SFINAE = void> struct compare_buffer_info {
+    static bool compare(const buffer_info& b) {
+        return b.format == format_descriptor<T>::format() && b.itemsize == (ssize_t) sizeof(T);
+    }
+};
+
+template <typename T> struct compare_buffer_info<T, detail::enable_if_t<std::is_integral<T>::value>> {
+    static bool compare(const buffer_info& b) {
+        return (size_t) b.itemsize == sizeof(T) && (b.format == format_descriptor<T>::value ||
+            ((sizeof(T) == sizeof(long)) && b.format == (std::is_unsigned<T>::value ? "L" : "l")) ||
+            ((sizeof(T) == sizeof(size_t)) && b.format == (std::is_unsigned<T>::value ? "N" : "n")));
+    }
+};
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/cast.h b/3rdparty/pybind11/include/pybind11/cast.h
new file mode 100644
index 00000000..a0b4d1ba
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/cast.h
@@ -0,0 +1,2179 @@
+/*
+    pybind11/cast.h: Partial template specializations to cast between
+    C++ and Python types
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pytypes.h"
+#include "detail/typeid.h"
+#include "detail/descr.h"
+#include "detail/internals.h"
+#include <array>
+#include <limits>
+#include <tuple>
+#include <type_traits>
+
+#if defined(PYBIND11_CPP17)
+#  if defined(__has_include)
+#    if __has_include(<string_view>)
+#      define PYBIND11_HAS_STRING_VIEW
+#    endif
+#  elif defined(_MSC_VER)
+#    define PYBIND11_HAS_STRING_VIEW
+#  endif
+#endif
+#ifdef PYBIND11_HAS_STRING_VIEW
+#include <string_view>
+#endif
+
+#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
+#  define PYBIND11_HAS_U8STRING
+#endif
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+/// A life support system for temporary objects created by `type_caster::load()`.
+/// Adding a patient will keep it alive up until the enclosing function returns.
+class loader_life_support {
+public:
+    /// A new patient frame is created when a function is entered
+    loader_life_support() {
+        get_internals().loader_patient_stack.push_back(nullptr);
+    }
+
+    /// ... and destroyed after it returns
+    ~loader_life_support() {
+        auto &stack = get_internals().loader_patient_stack;
+        if (stack.empty())
+            pybind11_fail("loader_life_support: internal error");
+
+        auto ptr = stack.back();
+        stack.pop_back();
+        Py_CLEAR(ptr);
+
+        // A heuristic to reduce the stack's capacity (e.g. after long recursive calls)
+        if (stack.capacity() > 16 && stack.size() != 0 && stack.capacity() / stack.size() > 2)
+            stack.shrink_to_fit();
+    }
+
+    /// This can only be used inside a pybind11-bound function, either by `argument_loader`
+    /// at argument preparation time or by `py::cast()` at execution time.
+    PYBIND11_NOINLINE static void add_patient(handle h) {
+        auto &stack = get_internals().loader_patient_stack;
+        if (stack.empty())
+            throw cast_error("When called outside a bound function, py::cast() cannot "
+                             "do Python -> C++ conversions which require the creation "
+                             "of temporary values");
+
+        auto &list_ptr = stack.back();
+        if (list_ptr == nullptr) {
+            list_ptr = PyList_New(1);
+            if (!list_ptr)
+                pybind11_fail("loader_life_support: error allocating list");
+            PyList_SET_ITEM(list_ptr, 0, h.inc_ref().ptr());
+        } else {
+            auto result = PyList_Append(list_ptr, h.ptr());
+            if (result == -1)
+                pybind11_fail("loader_life_support: error adding patient");
+        }
+    }
+};
+
+// Gets the cache entry for the given type, creating it if necessary.  The return value is the pair
+// returned by emplace, i.e. an iterator for the entry and a bool set to `true` if the entry was
+// just created.
+inline std::pair<decltype(internals::registered_types_py)::iterator, bool> all_type_info_get_cache(PyTypeObject *type);
+
+// Populates a just-created cache entry.
+PYBIND11_NOINLINE inline void all_type_info_populate(PyTypeObject *t, std::vector<type_info *> &bases) {
+    std::vector<PyTypeObject *> check;
+    for (handle parent : reinterpret_borrow<tuple>(t->tp_bases))
+        check.push_back((PyTypeObject *) parent.ptr());
+
+    auto const &type_dict = get_internals().registered_types_py;
+    for (size_t i = 0; i < check.size(); i++) {
+        auto type = check[i];
+        // Ignore Python2 old-style class super type:
+        if (!PyType_Check((PyObject *) type)) continue;
+
+        // Check `type` in the current set of registered python types:
+        auto it = type_dict.find(type);
+        if (it != type_dict.end()) {
+            // We found a cache entry for it, so it's either pybind-registered or has pre-computed
+            // pybind bases, but we have to make sure we haven't already seen the type(s) before: we
+            // want to follow Python/virtual C++ rules that there should only be one instance of a
+            // common base.
+            for (auto *tinfo : it->second) {
+                // NB: Could use a second set here, rather than doing a linear search, but since
+                // having a large number of immediate pybind11-registered types seems fairly
+                // unlikely, that probably isn't worthwhile.
+                bool found = false;
+                for (auto *known : bases) {
+                    if (known == tinfo) { found = true; break; }
+                }
+                if (!found) bases.push_back(tinfo);
+            }
+        }
+        else if (type->tp_bases) {
+            // It's some python type, so keep follow its bases classes to look for one or more
+            // registered types
+            if (i + 1 == check.size()) {
+                // When we're at the end, we can pop off the current element to avoid growing
+                // `check` when adding just one base (which is typical--i.e. when there is no
+                // multiple inheritance)
+                check.pop_back();
+                i--;
+            }
+            for (handle parent : reinterpret_borrow<tuple>(type->tp_bases))
+                check.push_back((PyTypeObject *) parent.ptr());
+        }
+    }
+}
+
+/**
+ * Extracts vector of type_info pointers of pybind-registered roots of the given Python type.  Will
+ * be just 1 pybind type for the Python type of a pybind-registered class, or for any Python-side
+ * derived class that uses single inheritance.  Will contain as many types as required for a Python
+ * class that uses multiple inheritance to inherit (directly or indirectly) from multiple
+ * pybind-registered classes.  Will be empty if neither the type nor any base classes are
+ * pybind-registered.
+ *
+ * The value is cached for the lifetime of the Python type.
+ */
+inline const std::vector<detail::type_info *> &all_type_info(PyTypeObject *type) {
+    auto ins = all_type_info_get_cache(type);
+    if (ins.second)
+        // New cache entry: populate it
+        all_type_info_populate(type, ins.first->second);
+
+    return ins.first->second;
+}
+
+/**
+ * Gets a single pybind11 type info for a python type.  Returns nullptr if neither the type nor any
+ * ancestors are pybind11-registered.  Throws an exception if there are multiple bases--use
+ * `all_type_info` instead if you want to support multiple bases.
+ */
+PYBIND11_NOINLINE inline detail::type_info* get_type_info(PyTypeObject *type) {
+    auto &bases = all_type_info(type);
+    if (bases.size() == 0)
+        return nullptr;
+    if (bases.size() > 1)
+        pybind11_fail("pybind11::detail::get_type_info: type has multiple pybind11-registered bases");
+    return bases.front();
+}
+
+inline detail::type_info *get_local_type_info(const std::type_index &tp) {
+    auto &locals = registered_local_types_cpp();
+    auto it = locals.find(tp);
+    if (it != locals.end())
+        return it->second;
+    return nullptr;
+}
+
+inline detail::type_info *get_global_type_info(const std::type_index &tp) {
+    auto &types = get_internals().registered_types_cpp;
+    auto it = types.find(tp);
+    if (it != types.end())
+        return it->second;
+    return nullptr;
+}
+
+/// Return the type info for a given C++ type; on lookup failure can either throw or return nullptr.
+PYBIND11_NOINLINE inline detail::type_info *get_type_info(const std::type_index &tp,
+                                                          bool throw_if_missing = false) {
+    if (auto ltype = get_local_type_info(tp))
+        return ltype;
+    if (auto gtype = get_global_type_info(tp))
+        return gtype;
+
+    if (throw_if_missing) {
+        std::string tname = tp.name();
+        detail::clean_type_id(tname);
+        pybind11_fail("pybind11::detail::get_type_info: unable to find type info for \"" + tname + "\"");
+    }
+    return nullptr;
+}
+
+PYBIND11_NOINLINE inline handle get_type_handle(const std::type_info &tp, bool throw_if_missing) {
+    detail::type_info *type_info = get_type_info(tp, throw_if_missing);
+    return handle(type_info ? ((PyObject *) type_info->type) : nullptr);
+}
+
+struct value_and_holder {
+    instance *inst = nullptr;
+    size_t index = 0u;
+    const detail::type_info *type = nullptr;
+    void **vh = nullptr;
+
+    // Main constructor for a found value/holder:
+    value_and_holder(instance *i, const detail::type_info *type, size_t vpos, size_t index) :
+        inst{i}, index{index}, type{type},
+        vh{inst->simple_layout ? inst->simple_value_holder : &inst->nonsimple.values_and_holders[vpos]}
+    {}
+
+    // Default constructor (used to signal a value-and-holder not found by get_value_and_holder())
+    value_and_holder() {}
+
+    // Used for past-the-end iterator
+    value_and_holder(size_t index) : index{index} {}
+
+    template <typename V = void> V *&value_ptr() const {
+        return reinterpret_cast<V *&>(vh[0]);
+    }
+    // True if this `value_and_holder` has a non-null value pointer
+    explicit operator bool() const { return value_ptr(); }
+
+    template <typename H> H &holder() const {
+        return reinterpret_cast<H &>(vh[1]);
+    }
+    bool holder_constructed() const {
+        return inst->simple_layout
+            ? inst->simple_holder_constructed
+            : inst->nonsimple.status[index] & instance::status_holder_constructed;
+    }
+    void set_holder_constructed(bool v = true) {
+        if (inst->simple_layout)
+            inst->simple_holder_constructed = v;
+        else if (v)
+            inst->nonsimple.status[index] |= instance::status_holder_constructed;
+        else
+            inst->nonsimple.status[index] &= (uint8_t) ~instance::status_holder_constructed;
+    }
+    bool instance_registered() const {
+        return inst->simple_layout
+            ? inst->simple_instance_registered
+            : inst->nonsimple.status[index] & instance::status_instance_registered;
+    }
+    void set_instance_registered(bool v = true) {
+        if (inst->simple_layout)
+            inst->simple_instance_registered = v;
+        else if (v)
+            inst->nonsimple.status[index] |= instance::status_instance_registered;
+        else
+            inst->nonsimple.status[index] &= (uint8_t) ~instance::status_instance_registered;
+    }
+};
+
+// Container for accessing and iterating over an instance's values/holders
+struct values_and_holders {
+private:
+    instance *inst;
+    using type_vec = std::vector<detail::type_info *>;
+    const type_vec &tinfo;
+
+public:
+    values_and_holders(instance *inst) : inst{inst}, tinfo(all_type_info(Py_TYPE(inst))) {}
+
+    struct iterator {
+    private:
+        instance *inst = nullptr;
+        const type_vec *types = nullptr;
+        value_and_holder curr;
+        friend struct values_and_holders;
+        iterator(instance *inst, const type_vec *tinfo)
+            : inst{inst}, types{tinfo},
+            curr(inst /* instance */,
+                 types->empty() ? nullptr : (*types)[0] /* type info */,
+                 0, /* vpos: (non-simple types only): the first vptr comes first */
+                 0 /* index */)
+        {}
+        // Past-the-end iterator:
+        iterator(size_t end) : curr(end) {}
+    public:
+        bool operator==(const iterator &other) { return curr.index == other.curr.index; }
+        bool operator!=(const iterator &other) { return curr.index != other.curr.index; }
+        iterator &operator++() {
+            if (!inst->simple_layout)
+                curr.vh += 1 + (*types)[curr.index]->holder_size_in_ptrs;
+            ++curr.index;
+            curr.type = curr.index < types->size() ? (*types)[curr.index] : nullptr;
+            return *this;
+        }
+        value_and_holder &operator*() { return curr; }
+        value_and_holder *operator->() { return &curr; }
+    };
+
+    iterator begin() { return iterator(inst, &tinfo); }
+    iterator end() { return iterator(tinfo.size()); }
+
+    iterator find(const type_info *find_type) {
+        auto it = begin(), endit = end();
+        while (it != endit && it->type != find_type) ++it;
+        return it;
+    }
+
+    size_t size() { return tinfo.size(); }
+};
+
+/**
+ * Extracts C++ value and holder pointer references from an instance (which may contain multiple
+ * values/holders for python-side multiple inheritance) that match the given type.  Throws an error
+ * if the given type (or ValueType, if omitted) is not a pybind11 base of the given instance.  If
+ * `find_type` is omitted (or explicitly specified as nullptr) the first value/holder are returned,
+ * regardless of type (and the resulting .type will be nullptr).
+ *
+ * The returned object should be short-lived: in particular, it must not outlive the called-upon
+ * instance.
+ */
+PYBIND11_NOINLINE inline value_and_holder instance::get_value_and_holder(const type_info *find_type /*= nullptr default in common.h*/, bool throw_if_missing /*= true in common.h*/) {
+    // Optimize common case:
+    if (!find_type || Py_TYPE(this) == find_type->type)
+        return value_and_holder(this, find_type, 0, 0);
+
+    detail::values_and_holders vhs(this);
+    auto it = vhs.find(find_type);
+    if (it != vhs.end())
+        return *it;
+
+    if (!throw_if_missing)
+        return value_and_holder();
+
+#if defined(NDEBUG)
+    pybind11_fail("pybind11::detail::instance::get_value_and_holder: "
+            "type is not a pybind11 base of the given instance "
+            "(compile in debug mode for type details)");
+#else
+    pybind11_fail("pybind11::detail::instance::get_value_and_holder: `" +
+            std::string(find_type->type->tp_name) + "' is not a pybind11 base of the given `" +
+            std::string(Py_TYPE(this)->tp_name) + "' instance");
+#endif
+}
+
+PYBIND11_NOINLINE inline void instance::allocate_layout() {
+    auto &tinfo = all_type_info(Py_TYPE(this));
+
+    const size_t n_types = tinfo.size();
+
+    if (n_types == 0)
+        pybind11_fail("instance allocation failed: new instance has no pybind11-registered base types");
+
+    simple_layout =
+        n_types == 1 && tinfo.front()->holder_size_in_ptrs <= instance_simple_holder_in_ptrs();
+
+    // Simple path: no python-side multiple inheritance, and a small-enough holder
+    if (simple_layout) {
+        simple_value_holder[0] = nullptr;
+        simple_holder_constructed = false;
+        simple_instance_registered = false;
+    }
+    else { // multiple base types or a too-large holder
+        // Allocate space to hold: [v1*][h1][v2*][h2]...[bb...] where [vN*] is a value pointer,
+        // [hN] is the (uninitialized) holder instance for value N, and [bb...] is a set of bool
+        // values that tracks whether each associated holder has been initialized.  Each [block] is
+        // padded, if necessary, to an integer multiple of sizeof(void *).
+        size_t space = 0;
+        for (auto t : tinfo) {
+            space += 1; // value pointer
+            space += t->holder_size_in_ptrs; // holder instance
+        }
+        size_t flags_at = space;
+        space += size_in_ptrs(n_types); // status bytes (holder_constructed and instance_registered)
+
+        // Allocate space for flags, values, and holders, and initialize it to 0 (flags and values,
+        // in particular, need to be 0).  Use Python's memory allocation functions: in Python 3.6
+        // they default to using pymalloc, which is designed to be efficient for small allocations
+        // like the one we're doing here; in earlier versions (and for larger allocations) they are
+        // just wrappers around malloc.
+#if PY_VERSION_HEX >= 0x03050000
+        nonsimple.values_and_holders = (void **) PyMem_Calloc(space, sizeof(void *));
+        if (!nonsimple.values_and_holders) throw std::bad_alloc();
+#else
+        nonsimple.values_and_holders = (void **) PyMem_New(void *, space);
+        if (!nonsimple.values_and_holders) throw std::bad_alloc();
+        std::memset(nonsimple.values_and_holders, 0, space * sizeof(void *));
+#endif
+        nonsimple.status = reinterpret_cast<uint8_t *>(&nonsimple.values_and_holders[flags_at]);
+    }
+    owned = true;
+}
+
+PYBIND11_NOINLINE inline void instance::deallocate_layout() {
+    if (!simple_layout)
+        PyMem_Free(nonsimple.values_and_holders);
+}
+
+PYBIND11_NOINLINE inline bool isinstance_generic(handle obj, const std::type_info &tp) {
+    handle type = detail::get_type_handle(tp, false);
+    if (!type)
+        return false;
+    return isinstance(obj, type);
+}
+
+PYBIND11_NOINLINE inline std::string error_string() {
+    if (!PyErr_Occurred()) {
+        PyErr_SetString(PyExc_RuntimeError, "Unknown internal error occurred");
+        return "Unknown internal error occurred";
+    }
+
+    error_scope scope; // Preserve error state
+
+    std::string errorString;
+    if (scope.type) {
+        errorString += handle(scope.type).attr("__name__").cast<std::string>();
+        errorString += ": ";
+    }
+    if (scope.value)
+        errorString += (std::string) str(scope.value);
+
+    PyErr_NormalizeException(&scope.type, &scope.value, &scope.trace);
+
+#if PY_MAJOR_VERSION >= 3
+    if (scope.trace != nullptr)
+        PyException_SetTraceback(scope.value, scope.trace);
+#endif
+
+#if !defined(PYPY_VERSION)
+    if (scope.trace) {
+        PyTracebackObject *trace = (PyTracebackObject *) scope.trace;
+
+        /* Get the deepest trace possible */
+        while (trace->tb_next)
+            trace = trace->tb_next;
+
+        PyFrameObject *frame = trace->tb_frame;
+        errorString += "\n\nAt:\n";
+        while (frame) {
+            int lineno = PyFrame_GetLineNumber(frame);
+            errorString +=
+                "  " + handle(frame->f_code->co_filename).cast<std::string>() +
+                "(" + std::to_string(lineno) + "): " +
+                handle(frame->f_code->co_name).cast<std::string>() + "\n";
+            frame = frame->f_back;
+        }
+    }
+#endif
+
+    return errorString;
+}
+
+PYBIND11_NOINLINE inline handle get_object_handle(const void *ptr, const detail::type_info *type ) {
+    auto &instances = get_internals().registered_instances;
+    auto range = instances.equal_range(ptr);
+    for (auto it = range.first; it != range.second; ++it) {
+        for (auto vh : values_and_holders(it->second)) {
+            if (vh.type == type)
+                return handle((PyObject *) it->second);
+        }
+    }
+    return handle();
+}
+
+inline PyThreadState *get_thread_state_unchecked() {
+#if defined(PYPY_VERSION)
+    return PyThreadState_GET();
+#elif PY_VERSION_HEX < 0x03000000
+    return _PyThreadState_Current;
+#elif PY_VERSION_HEX < 0x03050000
+    return (PyThreadState*) _Py_atomic_load_relaxed(&_PyThreadState_Current);
+#elif PY_VERSION_HEX < 0x03050200
+    return (PyThreadState*) _PyThreadState_Current.value;
+#else
+    return _PyThreadState_UncheckedGet();
+#endif
+}
+
+// Forward declarations
+inline void keep_alive_impl(handle nurse, handle patient);
+inline PyObject *make_new_instance(PyTypeObject *type);
+
+class type_caster_generic {
+public:
+    PYBIND11_NOINLINE type_caster_generic(const std::type_info &type_info)
+        : typeinfo(get_type_info(type_info)), cpptype(&type_info) { }
+
+    type_caster_generic(const type_info *typeinfo)
+        : typeinfo(typeinfo), cpptype(typeinfo ? typeinfo->cpptype : nullptr) { }
+
+    bool load(handle src, bool convert) {
+        return load_impl<type_caster_generic>(src, convert);
+    }
+
+    PYBIND11_NOINLINE static handle cast(const void *_src, return_value_policy policy, handle parent,
+                                         const detail::type_info *tinfo,
+                                         void *(*copy_constructor)(const void *),
+                                         void *(*move_constructor)(const void *),
+                                         const void *existing_holder = nullptr) {
+        if (!tinfo) // no type info: error will be set already
+            return handle();
+
+        void *src = const_cast<void *>(_src);
+        if (src == nullptr)
+            return none().release();
+
+        auto it_instances = get_internals().registered_instances.equal_range(src);
+        for (auto it_i = it_instances.first; it_i != it_instances.second; ++it_i) {
+            for (auto instance_type : detail::all_type_info(Py_TYPE(it_i->second))) {
+                if (instance_type && same_type(*instance_type->cpptype, *tinfo->cpptype))
+                    return handle((PyObject *) it_i->second).inc_ref();
+            }
+        }
+
+        auto inst = reinterpret_steal<object>(make_new_instance(tinfo->type));
+        auto wrapper = reinterpret_cast<instance *>(inst.ptr());
+        wrapper->owned = false;
+        void *&valueptr = values_and_holders(wrapper).begin()->value_ptr();
+
+        switch (policy) {
+            case return_value_policy::automatic:
+            case return_value_policy::take_ownership:
+                valueptr = src;
+                wrapper->owned = true;
+                break;
+
+            case return_value_policy::automatic_reference:
+            case return_value_policy::reference:
+                valueptr = src;
+                wrapper->owned = false;
+                break;
+
+            case return_value_policy::copy:
+                if (copy_constructor)
+                    valueptr = copy_constructor(src);
+                else {
+#if defined(NDEBUG)
+                    throw cast_error("return_value_policy = copy, but type is "
+                                     "non-copyable! (compile in debug mode for details)");
+#else
+                    std::string type_name(tinfo->cpptype->name());
+                    detail::clean_type_id(type_name);
+                    throw cast_error("return_value_policy = copy, but type " +
+                                     type_name + " is non-copyable!");
+#endif
+                }
+                wrapper->owned = true;
+                break;
+
+            case return_value_policy::move:
+                if (move_constructor)
+                    valueptr = move_constructor(src);
+                else if (copy_constructor)
+                    valueptr = copy_constructor(src);
+                else {
+#if defined(NDEBUG)
+                    throw cast_error("return_value_policy = move, but type is neither "
+                                     "movable nor copyable! "
+                                     "(compile in debug mode for details)");
+#else
+                    std::string type_name(tinfo->cpptype->name());
+                    detail::clean_type_id(type_name);
+                    throw cast_error("return_value_policy = move, but type " +
+                                     type_name + " is neither movable nor copyable!");
+#endif
+                }
+                wrapper->owned = true;
+                break;
+
+            case return_value_policy::reference_internal:
+                valueptr = src;
+                wrapper->owned = false;
+                keep_alive_impl(inst, parent);
+                break;
+
+            default:
+                throw cast_error("unhandled return_value_policy: should not happen!");
+        }
+
+        tinfo->init_instance(wrapper, existing_holder);
+
+        return inst.release();
+    }
+
+    // Base methods for generic caster; there are overridden in copyable_holder_caster
+    void load_value(value_and_holder &&v_h) {
+        auto *&vptr = v_h.value_ptr();
+        // Lazy allocation for unallocated values:
+        if (vptr == nullptr) {
+            auto *type = v_h.type ? v_h.type : typeinfo;
+            if (type->operator_new) {
+                vptr = type->operator_new(type->type_size);
+            } else {
+                #if defined(__cpp_aligned_new) && (!defined(_MSC_VER) || _MSC_VER >= 1912)
+                    if (type->type_align > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
+                        vptr = ::operator new(type->type_size,
+                                              std::align_val_t(type->type_align));
+                    else
+                #endif
+                vptr = ::operator new(type->type_size);
+            }
+        }
+        value = vptr;
+    }
+    bool try_implicit_casts(handle src, bool convert) {
+        for (auto &cast : typeinfo->implicit_casts) {
+            type_caster_generic sub_caster(*cast.first);
+            if (sub_caster.load(src, convert)) {
+                value = cast.second(sub_caster.value);
+                return true;
+            }
+        }
+        return false;
+    }
+    bool try_direct_conversions(handle src) {
+        for (auto &converter : *typeinfo->direct_conversions) {
+            if (converter(src.ptr(), value))
+                return true;
+        }
+        return false;
+    }
+    void check_holder_compat() {}
+
+    PYBIND11_NOINLINE static void *local_load(PyObject *src, const type_info *ti) {
+        auto caster = type_caster_generic(ti);
+        if (caster.load(src, false))
+            return caster.value;
+        return nullptr;
+    }
+
+    /// Try to load with foreign typeinfo, if available. Used when there is no
+    /// native typeinfo, or when the native one wasn't able to produce a value.
+    PYBIND11_NOINLINE bool try_load_foreign_module_local(handle src) {
+        constexpr auto *local_key = PYBIND11_MODULE_LOCAL_ID;
+        const auto pytype = src.get_type();
+        if (!hasattr(pytype, local_key))
+            return false;
+
+        type_info *foreign_typeinfo = reinterpret_borrow<capsule>(getattr(pytype, local_key));
+        // Only consider this foreign loader if actually foreign and is a loader of the correct cpp type
+        if (foreign_typeinfo->module_local_load == &local_load
+            || (cpptype && !same_type(*cpptype, *foreign_typeinfo->cpptype)))
+            return false;
+
+        if (auto result = foreign_typeinfo->module_local_load(src.ptr(), foreign_typeinfo)) {
+            value = result;
+            return true;
+        }
+        return false;
+    }
+
+    // Implementation of `load`; this takes the type of `this` so that it can dispatch the relevant
+    // bits of code between here and copyable_holder_caster where the two classes need different
+    // logic (without having to resort to virtual inheritance).
+    template <typename ThisT>
+    PYBIND11_NOINLINE bool load_impl(handle src, bool convert) {
+        if (!src) return false;
+        if (!typeinfo) return try_load_foreign_module_local(src);
+        if (src.is_none()) {
+            // Defer accepting None to other overloads (if we aren't in convert mode):
+            if (!convert) return false;
+            value = nullptr;
+            return true;
+        }
+
+        auto &this_ = static_cast<ThisT &>(*this);
+        this_.check_holder_compat();
+
+        PyTypeObject *srctype = Py_TYPE(src.ptr());
+
+        // Case 1: If src is an exact type match for the target type then we can reinterpret_cast
+        // the instance's value pointer to the target type:
+        if (srctype == typeinfo->type) {
+            this_.load_value(reinterpret_cast<instance *>(src.ptr())->get_value_and_holder());
+            return true;
+        }
+        // Case 2: We have a derived class
+        else if (PyType_IsSubtype(srctype, typeinfo->type)) {
+            auto &bases = all_type_info(srctype);
+            bool no_cpp_mi = typeinfo->simple_type;
+
+            // Case 2a: the python type is a Python-inherited derived class that inherits from just
+            // one simple (no MI) pybind11 class, or is an exact match, so the C++ instance is of
+            // the right type and we can use reinterpret_cast.
+            // (This is essentially the same as case 2b, but because not using multiple inheritance
+            // is extremely common, we handle it specially to avoid the loop iterator and type
+            // pointer lookup overhead)
+            if (bases.size() == 1 && (no_cpp_mi || bases.front()->type == typeinfo->type)) {
+                this_.load_value(reinterpret_cast<instance *>(src.ptr())->get_value_and_holder());
+                return true;
+            }
+            // Case 2b: the python type inherits from multiple C++ bases.  Check the bases to see if
+            // we can find an exact match (or, for a simple C++ type, an inherited match); if so, we
+            // can safely reinterpret_cast to the relevant pointer.
+            else if (bases.size() > 1) {
+                for (auto base : bases) {
+                    if (no_cpp_mi ? PyType_IsSubtype(base->type, typeinfo->type) : base->type == typeinfo->type) {
+                        this_.load_value(reinterpret_cast<instance *>(src.ptr())->get_value_and_holder(base));
+                        return true;
+                    }
+                }
+            }
+
+            // Case 2c: C++ multiple inheritance is involved and we couldn't find an exact type match
+            // in the registered bases, above, so try implicit casting (needed for proper C++ casting
+            // when MI is involved).
+            if (this_.try_implicit_casts(src, convert))
+                return true;
+        }
+
+        // Perform an implicit conversion
+        if (convert) {
+            for (auto &converter : typeinfo->implicit_conversions) {
+                auto temp = reinterpret_steal<object>(converter(src.ptr(), typeinfo->type));
+                if (load_impl<ThisT>(temp, false)) {
+                    loader_life_support::add_patient(temp);
+                    return true;
+                }
+            }
+            if (this_.try_direct_conversions(src))
+                return true;
+        }
+
+        // Failed to match local typeinfo. Try again with global.
+        if (typeinfo->module_local) {
+            if (auto gtype = get_global_type_info(*typeinfo->cpptype)) {
+                typeinfo = gtype;
+                return load(src, false);
+            }
+        }
+
+        // Global typeinfo has precedence over foreign module_local
+        return try_load_foreign_module_local(src);
+    }
+
+
+    // Called to do type lookup and wrap the pointer and type in a pair when a dynamic_cast
+    // isn't needed or can't be used.  If the type is unknown, sets the error and returns a pair
+    // with .second = nullptr.  (p.first = nullptr is not an error: it becomes None).
+    PYBIND11_NOINLINE static std::pair<const void *, const type_info *> src_and_type(
+            const void *src, const std::type_info &cast_type, const std::type_info *rtti_type = nullptr) {
+        if (auto *tpi = get_type_info(cast_type))
+            return {src, const_cast<const type_info *>(tpi)};
+
+        // Not found, set error:
+        std::string tname = rtti_type ? rtti_type->name() : cast_type.name();
+        detail::clean_type_id(tname);
+        std::string msg = "Unregistered type : " + tname;
+        PyErr_SetString(PyExc_TypeError, msg.c_str());
+        return {nullptr, nullptr};
+    }
+
+    const type_info *typeinfo = nullptr;
+    const std::type_info *cpptype = nullptr;
+    void *value = nullptr;
+};
+
+/**
+ * Determine suitable casting operator for pointer-or-lvalue-casting type casters.  The type caster
+ * needs to provide `operator T*()` and `operator T&()` operators.
+ *
+ * If the type supports moving the value away via an `operator T&&() &&` method, it should use
+ * `movable_cast_op_type` instead.
+ */
+template <typename T>
+using cast_op_type =
+    conditional_t<std::is_pointer<remove_reference_t<T>>::value,
+        typename std::add_pointer<intrinsic_t<T>>::type,
+        typename std::add_lvalue_reference<intrinsic_t<T>>::type>;
+
+/**
+ * Determine suitable casting operator for a type caster with a movable value.  Such a type caster
+ * needs to provide `operator T*()`, `operator T&()`, and `operator T&&() &&`.  The latter will be
+ * called in appropriate contexts where the value can be moved rather than copied.
+ *
+ * These operator are automatically provided when using the PYBIND11_TYPE_CASTER macro.
+ */
+template <typename T>
+using movable_cast_op_type =
+    conditional_t<std::is_pointer<typename std::remove_reference<T>::type>::value,
+        typename std::add_pointer<intrinsic_t<T>>::type,
+    conditional_t<std::is_rvalue_reference<T>::value,
+        typename std::add_rvalue_reference<intrinsic_t<T>>::type,
+        typename std::add_lvalue_reference<intrinsic_t<T>>::type>>;
+
+// std::is_copy_constructible isn't quite enough: it lets std::vector<T> (and similar) through when
+// T is non-copyable, but code containing such a copy constructor fails to actually compile.
+template <typename T, typename SFINAE = void> struct is_copy_constructible : std::is_copy_constructible<T> {};
+
+// Specialization for types that appear to be copy constructible but also look like stl containers
+// (we specifically check for: has `value_type` and `reference` with `reference = value_type&`): if
+// so, copy constructability depends on whether the value_type is copy constructible.
+template <typename Container> struct is_copy_constructible<Container, enable_if_t<all_of<
+        std::is_copy_constructible<Container>,
+        std::is_same<typename Container::value_type &, typename Container::reference>,
+        // Avoid infinite recursion
+        negation<std::is_same<Container, typename Container::value_type>>
+    >::value>> : is_copy_constructible<typename Container::value_type> {};
+
+// Likewise for std::pair
+// (after C++17 it is mandatory that the copy constructor not exist when the two types aren't themselves
+// copy constructible, but this can not be relied upon when T1 or T2 are themselves containers).
+template <typename T1, typename T2> struct is_copy_constructible<std::pair<T1, T2>>
+    : all_of<is_copy_constructible<T1>, is_copy_constructible<T2>> {};
+
+// The same problems arise with std::is_copy_assignable, so we use the same workaround.
+template <typename T, typename SFINAE = void> struct is_copy_assignable : std::is_copy_assignable<T> {};
+template <typename Container> struct is_copy_assignable<Container, enable_if_t<all_of<
+        std::is_copy_assignable<Container>,
+        std::is_same<typename Container::value_type &, typename Container::reference>
+    >::value>> : is_copy_assignable<typename Container::value_type> {};
+template <typename T1, typename T2> struct is_copy_assignable<std::pair<T1, T2>>
+    : all_of<is_copy_assignable<T1>, is_copy_assignable<T2>> {};
+
+NAMESPACE_END(detail)
+
+// polymorphic_type_hook<itype>::get(src, tinfo) determines whether the object pointed
+// to by `src` actually is an instance of some class derived from `itype`.
+// If so, it sets `tinfo` to point to the std::type_info representing that derived
+// type, and returns a pointer to the start of the most-derived object of that type
+// (in which `src` is a subobject; this will be the same address as `src` in most
+// single inheritance cases). If not, or if `src` is nullptr, it simply returns `src`
+// and leaves `tinfo` at its default value of nullptr.
+//
+// The default polymorphic_type_hook just returns src. A specialization for polymorphic
+// types determines the runtime type of the passed object and adjusts the this-pointer
+// appropriately via dynamic_cast<void*>. This is what enables a C++ Animal* to appear
+// to Python as a Dog (if Dog inherits from Animal, Animal is polymorphic, Dog is
+// registered with pybind11, and this Animal is in fact a Dog).
+//
+// You may specialize polymorphic_type_hook yourself for types that want to appear
+// polymorphic to Python but do not use C++ RTTI. (This is a not uncommon pattern
+// in performance-sensitive applications, used most notably in LLVM.)
+template <typename itype, typename SFINAE = void>
+struct polymorphic_type_hook
+{
+    static const void *get(const itype *src, const std::type_info*&) { return src; }
+};
+template <typename itype>
+struct polymorphic_type_hook<itype, detail::enable_if_t<std::is_polymorphic<itype>::value>>
+{
+    static const void *get(const itype *src, const std::type_info*& type) {
+        type = src ? &typeid(*src) : nullptr;
+        return dynamic_cast<const void*>(src);
+    }
+};
+
+NAMESPACE_BEGIN(detail)
+
+/// Generic type caster for objects stored on the heap
+template <typename type> class type_caster_base : public type_caster_generic {
+    using itype = intrinsic_t<type>;
+
+public:
+    static constexpr auto name = _<type>();
+
+    type_caster_base() : type_caster_base(typeid(type)) { }
+    explicit type_caster_base(const std::type_info &info) : type_caster_generic(info) { }
+
+    static handle cast(const itype &src, return_value_policy policy, handle parent) {
+        if (policy == return_value_policy::automatic || policy == return_value_policy::automatic_reference)
+            policy = return_value_policy::copy;
+        return cast(&src, policy, parent);
+    }
+
+    static handle cast(itype &&src, return_value_policy, handle parent) {
+        return cast(&src, return_value_policy::move, parent);
+    }
+
+    // Returns a (pointer, type_info) pair taking care of necessary type lookup for a
+    // polymorphic type (using RTTI by default, but can be overridden by specializing
+    // polymorphic_type_hook). If the instance isn't derived, returns the base version.
+    static std::pair<const void *, const type_info *> src_and_type(const itype *src) {
+        auto &cast_type = typeid(itype);
+        const std::type_info *instance_type = nullptr;
+        const void *vsrc = polymorphic_type_hook<itype>::get(src, instance_type);
+        if (instance_type && !same_type(cast_type, *instance_type)) {
+            // This is a base pointer to a derived type. If the derived type is registered
+            // with pybind11, we want to make the full derived object available.
+            // In the typical case where itype is polymorphic, we get the correct
+            // derived pointer (which may be != base pointer) by a dynamic_cast to
+            // most derived type. If itype is not polymorphic, we won't get here
+            // except via a user-provided specialization of polymorphic_type_hook,
+            // and the user has promised that no this-pointer adjustment is
+            // required in that case, so it's OK to use static_cast.
+            if (const auto *tpi = get_type_info(*instance_type))
+                return {vsrc, tpi};
+        }
+        // Otherwise we have either a nullptr, an `itype` pointer, or an unknown derived pointer, so
+        // don't do a cast
+        return type_caster_generic::src_and_type(src, cast_type, instance_type);
+    }
+
+    static handle cast(const itype *src, return_value_policy policy, handle parent) {
+        auto st = src_and_type(src);
+        return type_caster_generic::cast(
+            st.first, policy, parent, st.second,
+            make_copy_constructor(src), make_move_constructor(src));
+    }
+
+    static handle cast_holder(const itype *src, const void *holder) {
+        auto st = src_and_type(src);
+        return type_caster_generic::cast(
+            st.first, return_value_policy::take_ownership, {}, st.second,
+            nullptr, nullptr, holder);
+    }
+
+    template <typename T> using cast_op_type = detail::cast_op_type<T>;
+
+    operator itype*() { return (type *) value; }
+    operator itype&() { if (!value) throw reference_cast_error(); return *((itype *) value); }
+
+protected:
+    using Constructor = void *(*)(const void *);
+
+    /* Only enabled when the types are {copy,move}-constructible *and* when the type
+       does not have a private operator new implementation. */
+    template <typename T, typename = enable_if_t<is_copy_constructible<T>::value>>
+    static auto make_copy_constructor(const T *x) -> decltype(new T(*x), Constructor{}) {
+        return [](const void *arg) -> void * {
+            return new T(*reinterpret_cast<const T *>(arg));
+        };
+    }
+
+    template <typename T, typename = enable_if_t<std::is_move_constructible<T>::value>>
+    static auto make_move_constructor(const T *x) -> decltype(new T(std::move(*const_cast<T *>(x))), Constructor{}) {
+        return [](const void *arg) -> void * {
+            return new T(std::move(*const_cast<T *>(reinterpret_cast<const T *>(arg))));
+        };
+    }
+
+    static Constructor make_copy_constructor(...) { return nullptr; }
+    static Constructor make_move_constructor(...) { return nullptr; }
+};
+
+template <typename type, typename SFINAE = void> class type_caster : public type_caster_base<type> { };
+template <typename type> using make_caster = type_caster<intrinsic_t<type>>;
+
+// Shortcut for calling a caster's `cast_op_type` cast operator for casting a type_caster to a T
+template <typename T> typename make_caster<T>::template cast_op_type<T> cast_op(make_caster<T> &caster) {
+    return caster.operator typename make_caster<T>::template cast_op_type<T>();
+}
+template <typename T> typename make_caster<T>::template cast_op_type<typename std::add_rvalue_reference<T>::type>
+cast_op(make_caster<T> &&caster) {
+    return std::move(caster).operator
+        typename make_caster<T>::template cast_op_type<typename std::add_rvalue_reference<T>::type>();
+}
+
+template <typename type> class type_caster<std::reference_wrapper<type>> {
+private:
+    using caster_t = make_caster<type>;
+    caster_t subcaster;
+    using subcaster_cast_op_type = typename caster_t::template cast_op_type<type>;
+    static_assert(std::is_same<typename std::remove_const<type>::type &, subcaster_cast_op_type>::value,
+            "std::reference_wrapper<T> caster requires T to have a caster with an `T &` operator");
+public:
+    bool load(handle src, bool convert) { return subcaster.load(src, convert); }
+    static constexpr auto name = caster_t::name;
+    static handle cast(const std::reference_wrapper<type> &src, return_value_policy policy, handle parent) {
+        // It is definitely wrong to take ownership of this pointer, so mask that rvp
+        if (policy == return_value_policy::take_ownership || policy == return_value_policy::automatic)
+            policy = return_value_policy::automatic_reference;
+        return caster_t::cast(&src.get(), policy, parent);
+    }
+    template <typename T> using cast_op_type = std::reference_wrapper<type>;
+    operator std::reference_wrapper<type>() { return subcaster.operator subcaster_cast_op_type&(); }
+};
+
+#define PYBIND11_TYPE_CASTER(type, py_name) \
+    protected: \
+        type value; \
+    public: \
+        static constexpr auto name = py_name; \
+        template <typename T_, enable_if_t<std::is_same<type, remove_cv_t<T_>>::value, int> = 0> \
+        static handle cast(T_ *src, return_value_policy policy, handle parent) { \
+            if (!src) return none().release(); \
+            if (policy == return_value_policy::take_ownership) { \
+                auto h = cast(std::move(*src), policy, parent); delete src; return h; \
+            } else { \
+                return cast(*src, policy, parent); \
+            } \
+        } \
+        operator type*() { return &value; } \
+        operator type&() { return value; } \
+        operator type&&() && { return std::move(value); } \
+        template <typename T_> using cast_op_type = pybind11::detail::movable_cast_op_type<T_>
+
+
+template <typename CharT> using is_std_char_type = any_of<
+    std::is_same<CharT, char>, /* std::string */
+#if defined(PYBIND11_HAS_U8STRING)
+    std::is_same<CharT, char8_t>, /* std::u8string */
+#endif
+    std::is_same<CharT, char16_t>, /* std::u16string */
+    std::is_same<CharT, char32_t>, /* std::u32string */
+    std::is_same<CharT, wchar_t> /* std::wstring */
+>;
+
+template <typename T>
+struct type_caster<T, enable_if_t<std::is_arithmetic<T>::value && !is_std_char_type<T>::value>> {
+    using _py_type_0 = conditional_t<sizeof(T) <= sizeof(long), long, long long>;
+    using _py_type_1 = conditional_t<std::is_signed<T>::value, _py_type_0, typename std::make_unsigned<_py_type_0>::type>;
+    using py_type = conditional_t<std::is_floating_point<T>::value, double, _py_type_1>;
+public:
+
+    bool load(handle src, bool convert) {
+        py_type py_value;
+
+        if (!src)
+            return false;
+
+        if (std::is_floating_point<T>::value) {
+            if (convert || PyFloat_Check(src.ptr()))
+                py_value = (py_type) PyFloat_AsDouble(src.ptr());
+            else
+                return false;
+        } else if (PyFloat_Check(src.ptr())) {
+            return false;
+        } else if (std::is_unsigned<py_type>::value) {
+            py_value = as_unsigned<py_type>(src.ptr());
+        } else { // signed integer:
+            py_value = sizeof(T) <= sizeof(long)
+                ? (py_type) PyLong_AsLong(src.ptr())
+                : (py_type) PYBIND11_LONG_AS_LONGLONG(src.ptr());
+        }
+
+        bool py_err = py_value == (py_type) -1 && PyErr_Occurred();
+
+        // Protect std::numeric_limits::min/max with parentheses
+        if (py_err || (std::is_integral<T>::value && sizeof(py_type) != sizeof(T) &&
+                       (py_value < (py_type) (std::numeric_limits<T>::min)() ||
+                        py_value > (py_type) (std::numeric_limits<T>::max)()))) {
+            bool type_error = py_err && PyErr_ExceptionMatches(
+#if PY_VERSION_HEX < 0x03000000 && !defined(PYPY_VERSION)
+                PyExc_SystemError
+#else
+                PyExc_TypeError
+#endif
+            );
+            PyErr_Clear();
+            if (type_error && convert && PyNumber_Check(src.ptr())) {
+                auto tmp = reinterpret_steal<object>(std::is_floating_point<T>::value
+                                                     ? PyNumber_Float(src.ptr())
+                                                     : PyNumber_Long(src.ptr()));
+                PyErr_Clear();
+                return load(tmp, false);
+            }
+            return false;
+        }
+
+        value = (T) py_value;
+        return true;
+    }
+
+    template<typename U = T>
+    static typename std::enable_if<std::is_floating_point<U>::value, handle>::type
+    cast(U src, return_value_policy /* policy */, handle /* parent */) {
+        return PyFloat_FromDouble((double) src);
+    }
+
+    template<typename U = T>
+    static typename std::enable_if<!std::is_floating_point<U>::value && std::is_signed<U>::value && (sizeof(U) <= sizeof(long)), handle>::type
+    cast(U src, return_value_policy /* policy */, handle /* parent */) {
+        return PYBIND11_LONG_FROM_SIGNED((long) src);
+    }
+
+    template<typename U = T>
+    static typename std::enable_if<!std::is_floating_point<U>::value && std::is_unsigned<U>::value && (sizeof(U) <= sizeof(unsigned long)), handle>::type
+    cast(U src, return_value_policy /* policy */, handle /* parent */) {
+        return PYBIND11_LONG_FROM_UNSIGNED((unsigned long) src);
+    }
+
+    template<typename U = T>
+    static typename std::enable_if<!std::is_floating_point<U>::value && std::is_signed<U>::value && (sizeof(U) > sizeof(long)), handle>::type
+    cast(U src, return_value_policy /* policy */, handle /* parent */) {
+        return PyLong_FromLongLong((long long) src);
+    }
+
+    template<typename U = T>
+    static typename std::enable_if<!std::is_floating_point<U>::value && std::is_unsigned<U>::value && (sizeof(U) > sizeof(unsigned long)), handle>::type
+    cast(U src, return_value_policy /* policy */, handle /* parent */) {
+        return PyLong_FromUnsignedLongLong((unsigned long long) src);
+    }
+
+    PYBIND11_TYPE_CASTER(T, _<std::is_integral<T>::value>("int", "float"));
+};
+
+template<typename T> struct void_caster {
+public:
+    bool load(handle src, bool) {
+        if (src && src.is_none())
+            return true;
+        return false;
+    }
+    static handle cast(T, return_value_policy /* policy */, handle /* parent */) {
+        return none().inc_ref();
+    }
+    PYBIND11_TYPE_CASTER(T, _("None"));
+};
+
+template <> class type_caster<void_type> : public void_caster<void_type> {};
+
+template <> class type_caster<void> : public type_caster<void_type> {
+public:
+    using type_caster<void_type>::cast;
+
+    bool load(handle h, bool) {
+        if (!h) {
+            return false;
+        } else if (h.is_none()) {
+            value = nullptr;
+            return true;
+        }
+
+        /* Check if this is a capsule */
+        if (isinstance<capsule>(h)) {
+            value = reinterpret_borrow<capsule>(h);
+            return true;
+        }
+
+        /* Check if this is a C++ type */
+        auto &bases = all_type_info((PyTypeObject *) h.get_type().ptr());
+        if (bases.size() == 1) { // Only allowing loading from a single-value type
+            value = values_and_holders(reinterpret_cast<instance *>(h.ptr())).begin()->value_ptr();
+            return true;
+        }
+
+        /* Fail */
+        return false;
+    }
+
+    static handle cast(const void *ptr, return_value_policy /* policy */, handle /* parent */) {
+        if (ptr)
+            return capsule(ptr).release();
+        else
+            return none().inc_ref();
+    }
+
+    template <typename T> using cast_op_type = void*&;
+    operator void *&() { return value; }
+    static constexpr auto name = _("capsule");
+private:
+    void *value = nullptr;
+};
+
+template <> class type_caster<std::nullptr_t> : public void_caster<std::nullptr_t> { };
+
+template <> class type_caster<bool> {
+public:
+    bool load(handle src, bool convert) {
+        if (!src) return false;
+        else if (src.ptr() == Py_True) { value = true; return true; }
+        else if (src.ptr() == Py_False) { value = false; return true; }
+        else if (convert || !strcmp("numpy.bool_", Py_TYPE(src.ptr())->tp_name)) {
+            // (allow non-implicit conversion for numpy booleans)
+
+            Py_ssize_t res = -1;
+            if (src.is_none()) {
+                res = 0;  // None is implicitly converted to False
+            }
+            #if defined(PYPY_VERSION)
+            // On PyPy, check that "__bool__" (or "__nonzero__" on Python 2.7) attr exists
+            else if (hasattr(src, PYBIND11_BOOL_ATTR)) {
+                res = PyObject_IsTrue(src.ptr());
+            }
+            #else
+            // Alternate approach for CPython: this does the same as the above, but optimized
+            // using the CPython API so as to avoid an unneeded attribute lookup.
+            else if (auto tp_as_number = src.ptr()->ob_type->tp_as_number) {
+                if (PYBIND11_NB_BOOL(tp_as_number)) {
+                    res = (*PYBIND11_NB_BOOL(tp_as_number))(src.ptr());
+                }
+            }
+            #endif
+            if (res == 0 || res == 1) {
+                value = (bool) res;
+                return true;
+            } else {
+                PyErr_Clear();
+            }
+        }
+        return false;
+    }
+    static handle cast(bool src, return_value_policy /* policy */, handle /* parent */) {
+        return handle(src ? Py_True : Py_False).inc_ref();
+    }
+    PYBIND11_TYPE_CASTER(bool, _("bool"));
+};
+
+// Helper class for UTF-{8,16,32} C++ stl strings:
+template <typename StringType, bool IsView = false> struct string_caster {
+    using CharT = typename StringType::value_type;
+
+    // Simplify life by being able to assume standard char sizes (the standard only guarantees
+    // minimums, but Python requires exact sizes)
+    static_assert(!std::is_same<CharT, char>::value || sizeof(CharT) == 1, "Unsupported char size != 1");
+#if defined(PYBIND11_HAS_U8STRING)
+    static_assert(!std::is_same<CharT, char8_t>::value || sizeof(CharT) == 1, "Unsupported char8_t size != 1");
+#endif
+    static_assert(!std::is_same<CharT, char16_t>::value || sizeof(CharT) == 2, "Unsupported char16_t size != 2");
+    static_assert(!std::is_same<CharT, char32_t>::value || sizeof(CharT) == 4, "Unsupported char32_t size != 4");
+    // wchar_t can be either 16 bits (Windows) or 32 (everywhere else)
+    static_assert(!std::is_same<CharT, wchar_t>::value || sizeof(CharT) == 2 || sizeof(CharT) == 4,
+            "Unsupported wchar_t size != 2/4");
+    static constexpr size_t UTF_N = 8 * sizeof(CharT);
+
+    bool load(handle src, bool) {
+#if PY_MAJOR_VERSION < 3
+        object temp;
+#endif
+        handle load_src = src;
+        if (!src) {
+            return false;
+        } else if (!PyUnicode_Check(load_src.ptr())) {
+#if PY_MAJOR_VERSION >= 3
+            return load_bytes(load_src);
+#else
+            if (std::is_same<CharT, char>::value) {
+                return load_bytes(load_src);
+            }
+
+            // The below is a guaranteed failure in Python 3 when PyUnicode_Check returns false
+            if (!PYBIND11_BYTES_CHECK(load_src.ptr()))
+                return false;
+
+            temp = reinterpret_steal<object>(PyUnicode_FromObject(load_src.ptr()));
+            if (!temp) { PyErr_Clear(); return false; }
+            load_src = temp;
+#endif
+        }
+
+        object utfNbytes = reinterpret_steal<object>(PyUnicode_AsEncodedString(
+            load_src.ptr(), UTF_N == 8 ? "utf-8" : UTF_N == 16 ? "utf-16" : "utf-32", nullptr));
+        if (!utfNbytes) { PyErr_Clear(); return false; }
+
+        const CharT *buffer = reinterpret_cast<const CharT *>(PYBIND11_BYTES_AS_STRING(utfNbytes.ptr()));
+        size_t length = (size_t) PYBIND11_BYTES_SIZE(utfNbytes.ptr()) / sizeof(CharT);
+        if (UTF_N > 8) { buffer++; length--; } // Skip BOM for UTF-16/32
+        value = StringType(buffer, length);
+
+        // If we're loading a string_view we need to keep the encoded Python object alive:
+        if (IsView)
+            loader_life_support::add_patient(utfNbytes);
+
+        return true;
+    }
+
+    static handle cast(const StringType &src, return_value_policy /* policy */, handle /* parent */) {
+        const char *buffer = reinterpret_cast<const char *>(src.data());
+        ssize_t nbytes = ssize_t(src.size() * sizeof(CharT));
+        handle s = decode_utfN(buffer, nbytes);
+        if (!s) throw error_already_set();
+        return s;
+    }
+
+    PYBIND11_TYPE_CASTER(StringType, _(PYBIND11_STRING_NAME));
+
+private:
+    static handle decode_utfN(const char *buffer, ssize_t nbytes) {
+#if !defined(PYPY_VERSION)
+        return
+            UTF_N == 8  ? PyUnicode_DecodeUTF8(buffer, nbytes, nullptr) :
+            UTF_N == 16 ? PyUnicode_DecodeUTF16(buffer, nbytes, nullptr, nullptr) :
+                          PyUnicode_DecodeUTF32(buffer, nbytes, nullptr, nullptr);
+#else
+        // PyPy seems to have multiple problems related to PyUnicode_UTF*: the UTF8 version
+        // sometimes segfaults for unknown reasons, while the UTF16 and 32 versions require a
+        // non-const char * arguments, which is also a nuisance, so bypass the whole thing by just
+        // passing the encoding as a string value, which works properly:
+        return PyUnicode_Decode(buffer, nbytes, UTF_N == 8 ? "utf-8" : UTF_N == 16 ? "utf-16" : "utf-32", nullptr);
+#endif
+    }
+
+    // When loading into a std::string or char*, accept a bytes object as-is (i.e.
+    // without any encoding/decoding attempt).  For other C++ char sizes this is a no-op.
+    // which supports loading a unicode from a str, doesn't take this path.
+    template <typename C = CharT>
+    bool load_bytes(enable_if_t<std::is_same<C, char>::value, handle> src) {
+        if (PYBIND11_BYTES_CHECK(src.ptr())) {
+            // We were passed a Python 3 raw bytes; accept it into a std::string or char*
+            // without any encoding attempt.
+            const char *bytes = PYBIND11_BYTES_AS_STRING(src.ptr());
+            if (bytes) {
+                value = StringType(bytes, (size_t) PYBIND11_BYTES_SIZE(src.ptr()));
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    template <typename C = CharT>
+    bool load_bytes(enable_if_t<!std::is_same<C, char>::value, handle>) { return false; }
+};
+
+template <typename CharT, class Traits, class Allocator>
+struct type_caster<std::basic_string<CharT, Traits, Allocator>, enable_if_t<is_std_char_type<CharT>::value>>
+    : string_caster<std::basic_string<CharT, Traits, Allocator>> {};
+
+#ifdef PYBIND11_HAS_STRING_VIEW
+template <typename CharT, class Traits>
+struct type_caster<std::basic_string_view<CharT, Traits>, enable_if_t<is_std_char_type<CharT>::value>>
+    : string_caster<std::basic_string_view<CharT, Traits>, true> {};
+#endif
+
+// Type caster for C-style strings.  We basically use a std::string type caster, but also add the
+// ability to use None as a nullptr char* (which the string caster doesn't allow).
+template <typename CharT> struct type_caster<CharT, enable_if_t<is_std_char_type<CharT>::value>> {
+    using StringType = std::basic_string<CharT>;
+    using StringCaster = type_caster<StringType>;
+    StringCaster str_caster;
+    bool none = false;
+    CharT one_char = 0;
+public:
+    bool load(handle src, bool convert) {
+        if (!src) return false;
+        if (src.is_none()) {
+            // Defer accepting None to other overloads (if we aren't in convert mode):
+            if (!convert) return false;
+            none = true;
+            return true;
+        }
+        return str_caster.load(src, convert);
+    }
+
+    static handle cast(const CharT *src, return_value_policy policy, handle parent) {
+        if (src == nullptr) return pybind11::none().inc_ref();
+        return StringCaster::cast(StringType(src), policy, parent);
+    }
+
+    static handle cast(CharT src, return_value_policy policy, handle parent) {
+        if (std::is_same<char, CharT>::value) {
+            handle s = PyUnicode_DecodeLatin1((const char *) &src, 1, nullptr);
+            if (!s) throw error_already_set();
+            return s;
+        }
+        return StringCaster::cast(StringType(1, src), policy, parent);
+    }
+
+    operator CharT*() { return none ? nullptr : const_cast<CharT *>(static_cast<StringType &>(str_caster).c_str()); }
+    operator CharT&() {
+        if (none)
+            throw value_error("Cannot convert None to a character");
+
+        auto &value = static_cast<StringType &>(str_caster);
+        size_t str_len = value.size();
+        if (str_len == 0)
+            throw value_error("Cannot convert empty string to a character");
+
+        // If we're in UTF-8 mode, we have two possible failures: one for a unicode character that
+        // is too high, and one for multiple unicode characters (caught later), so we need to figure
+        // out how long the first encoded character is in bytes to distinguish between these two
+        // errors.  We also allow want to allow unicode characters U+0080 through U+00FF, as those
+        // can fit into a single char value.
+        if (StringCaster::UTF_N == 8 && str_len > 1 && str_len <= 4) {
+            unsigned char v0 = static_cast<unsigned char>(value[0]);
+            size_t char0_bytes = !(v0 & 0x80) ? 1 : // low bits only: 0-127
+                (v0 & 0xE0) == 0xC0 ? 2 : // 0b110xxxxx - start of 2-byte sequence
+                (v0 & 0xF0) == 0xE0 ? 3 : // 0b1110xxxx - start of 3-byte sequence
+                4; // 0b11110xxx - start of 4-byte sequence
+
+            if (char0_bytes == str_len) {
+                // If we have a 128-255 value, we can decode it into a single char:
+                if (char0_bytes == 2 && (v0 & 0xFC) == 0xC0) { // 0x110000xx 0x10xxxxxx
+                    one_char = static_cast<CharT>(((v0 & 3) << 6) + (static_cast<unsigned char>(value[1]) & 0x3F));
+                    return one_char;
+                }
+                // Otherwise we have a single character, but it's > U+00FF
+                throw value_error("Character code point not in range(0x100)");
+            }
+        }
+
+        // UTF-16 is much easier: we can only have a surrogate pair for values above U+FFFF, thus a
+        // surrogate pair with total length 2 instantly indicates a range error (but not a "your
+        // string was too long" error).
+        else if (StringCaster::UTF_N == 16 && str_len == 2) {
+            one_char = static_cast<CharT>(value[0]);
+            if (one_char >= 0xD800 && one_char < 0xE000)
+                throw value_error("Character code point not in range(0x10000)");
+        }
+
+        if (str_len != 1)
+            throw value_error("Expected a character, but multi-character string found");
+
+        one_char = value[0];
+        return one_char;
+    }
+
+    static constexpr auto name = _(PYBIND11_STRING_NAME);
+    template <typename _T> using cast_op_type = pybind11::detail::cast_op_type<_T>;
+};
+
+// Base implementation for std::tuple and std::pair
+template <template<typename...> class Tuple, typename... Ts> class tuple_caster {
+    using type = Tuple<Ts...>;
+    static constexpr auto size = sizeof...(Ts);
+    using indices = make_index_sequence<size>;
+public:
+
+    bool load(handle src, bool convert) {
+        if (!isinstance<sequence>(src))
+            return false;
+        const auto seq = reinterpret_borrow<sequence>(src);
+        if (seq.size() != size)
+            return false;
+        return load_impl(seq, convert, indices{});
+    }
+
+    template <typename T>
+    static handle cast(T &&src, return_value_policy policy, handle parent) {
+        return cast_impl(std::forward<T>(src), policy, parent, indices{});
+    }
+
+    static constexpr auto name = _("Tuple[") + concat(make_caster<Ts>::name...) + _("]");
+
+    template <typename T> using cast_op_type = type;
+
+    operator type() & { return implicit_cast(indices{}); }
+    operator type() && { return std::move(*this).implicit_cast(indices{}); }
+
+protected:
+    template <size_t... Is>
+    type implicit_cast(index_sequence<Is...>) & { return type(cast_op<Ts>(std::get<Is>(subcasters))...); }
+    template <size_t... Is>
+    type implicit_cast(index_sequence<Is...>) && { return type(cast_op<Ts>(std::move(std::get<Is>(subcasters)))...); }
+
+    static constexpr bool load_impl(const sequence &, bool, index_sequence<>) { return true; }
+
+    template <size_t... Is>
+    bool load_impl(const sequence &seq, bool convert, index_sequence<Is...>) {
+#ifdef __cpp_fold_expressions
+        if ((... || !std::get<Is>(subcasters).load(seq[Is], convert)))
+            return false;
+#else
+        for (bool r : {std::get<Is>(subcasters).load(seq[Is], convert)...})
+            if (!r)
+                return false;
+#endif
+        return true;
+    }
+
+    /* Implementation: Convert a C++ tuple into a Python tuple */
+    template <typename T, size_t... Is>
+    static handle cast_impl(T &&src, return_value_policy policy, handle parent, index_sequence<Is...>) {
+        std::array<object, size> entries{{
+            reinterpret_steal<object>(make_caster<Ts>::cast(std::get<Is>(std::forward<T>(src)), policy, parent))...
+        }};
+        for (const auto &entry: entries)
+            if (!entry)
+                return handle();
+        tuple result(size);
+        int counter = 0;
+        for (auto & entry: entries)
+            PyTuple_SET_ITEM(result.ptr(), counter++, entry.release().ptr());
+        return result.release();
+    }
+
+    Tuple<make_caster<Ts>...> subcasters;
+};
+
+template <typename T1, typename T2> class type_caster<std::pair<T1, T2>>
+    : public tuple_caster<std::pair, T1, T2> {};
+
+template <typename... Ts> class type_caster<std::tuple<Ts...>>
+    : public tuple_caster<std::tuple, Ts...> {};
+
+/// Helper class which abstracts away certain actions. Users can provide specializations for
+/// custom holders, but it's only necessary if the type has a non-standard interface.
+template <typename T>
+struct holder_helper {
+    static auto get(const T &p) -> decltype(p.get()) { return p.get(); }
+};
+
+/// Type caster for holder types like std::shared_ptr, etc.
+template <typename type, typename holder_type>
+struct copyable_holder_caster : public type_caster_base<type> {
+public:
+    using base = type_caster_base<type>;
+    static_assert(std::is_base_of<base, type_caster<type>>::value,
+            "Holder classes are only supported for custom types");
+    using base::base;
+    using base::cast;
+    using base::typeinfo;
+    using base::value;
+
+    bool load(handle src, bool convert) {
+        return base::template load_impl<copyable_holder_caster<type, holder_type>>(src, convert);
+    }
+
+    explicit operator type*() { return this->value; }
+    explicit operator type&() { return *(this->value); }
+    explicit operator holder_type*() { return std::addressof(holder); }
+
+    // Workaround for Intel compiler bug
+    // see pybind11 issue 94
+    #if defined(__ICC) || defined(__INTEL_COMPILER)
+    operator holder_type&() { return holder; }
+    #else
+    explicit operator holder_type&() { return holder; }
+    #endif
+
+    static handle cast(const holder_type &src, return_value_policy, handle) {
+        const auto *ptr = holder_helper<holder_type>::get(src);
+        return type_caster_base<type>::cast_holder(ptr, &src);
+    }
+
+protected:
+    friend class type_caster_generic;
+    void check_holder_compat() {
+        if (typeinfo->default_holder)
+            throw cast_error("Unable to load a custom holder type from a default-holder instance");
+    }
+
+    bool load_value(value_and_holder &&v_h) {
+        if (v_h.holder_constructed()) {
+            value = v_h.value_ptr();
+            holder = v_h.template holder<holder_type>();
+            return true;
+        } else {
+            throw cast_error("Unable to cast from non-held to held instance (T& to Holder<T>) "
+#if defined(NDEBUG)
+                             "(compile in debug mode for type information)");
+#else
+                             "of type '" + type_id<holder_type>() + "''");
+#endif
+        }
+    }
+
+    template <typename T = holder_type, detail::enable_if_t<!std::is_constructible<T, const T &, type*>::value, int> = 0>
+    bool try_implicit_casts(handle, bool) { return false; }
+
+    template <typename T = holder_type, detail::enable_if_t<std::is_constructible<T, const T &, type*>::value, int> = 0>
+    bool try_implicit_casts(handle src, bool convert) {
+        for (auto &cast : typeinfo->implicit_casts) {
+            copyable_holder_caster sub_caster(*cast.first);
+            if (sub_caster.load(src, convert)) {
+                value = cast.second(sub_caster.value);
+                holder = holder_type(sub_caster.holder, (type *) value);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    static bool try_direct_conversions(handle) { return false; }
+
+
+    holder_type holder;
+};
+
+/// Specialize for the common std::shared_ptr, so users don't need to
+template <typename T>
+class type_caster<std::shared_ptr<T>> : public copyable_holder_caster<T, std::shared_ptr<T>> { };
+
+template <typename type, typename holder_type>
+struct move_only_holder_caster {
+    static_assert(std::is_base_of<type_caster_base<type>, type_caster<type>>::value,
+            "Holder classes are only supported for custom types");
+
+    static handle cast(holder_type &&src, return_value_policy, handle) {
+        auto *ptr = holder_helper<holder_type>::get(src);
+        return type_caster_base<type>::cast_holder(ptr, std::addressof(src));
+    }
+    static constexpr auto name = type_caster_base<type>::name;
+};
+
+template <typename type, typename deleter>
+class type_caster<std::unique_ptr<type, deleter>>
+    : public move_only_holder_caster<type, std::unique_ptr<type, deleter>> { };
+
+template <typename type, typename holder_type>
+using type_caster_holder = conditional_t<is_copy_constructible<holder_type>::value,
+                                         copyable_holder_caster<type, holder_type>,
+                                         move_only_holder_caster<type, holder_type>>;
+
+template <typename T, bool Value = false> struct always_construct_holder { static constexpr bool value = Value; };
+
+/// Create a specialization for custom holder types (silently ignores std::shared_ptr)
+#define PYBIND11_DECLARE_HOLDER_TYPE(type, holder_type, ...) \
+    namespace pybind11 { namespace detail { \
+    template <typename type> \
+    struct always_construct_holder<holder_type> : always_construct_holder<void, ##__VA_ARGS__>  { }; \
+    template <typename type> \
+    class type_caster<holder_type, enable_if_t<!is_shared_ptr<holder_type>::value>> \
+        : public type_caster_holder<type, holder_type> { }; \
+    }}
+
+// PYBIND11_DECLARE_HOLDER_TYPE holder types:
+template <typename base, typename holder> struct is_holder_type :
+    std::is_base_of<detail::type_caster_holder<base, holder>, detail::type_caster<holder>> {};
+// Specialization for always-supported unique_ptr holders:
+template <typename base, typename deleter> struct is_holder_type<base, std::unique_ptr<base, deleter>> :
+    std::true_type {};
+
+template <typename T> struct handle_type_name { static constexpr auto name = _<T>(); };
+template <> struct handle_type_name<bytes> { static constexpr auto name = _(PYBIND11_BYTES_NAME); };
+template <> struct handle_type_name<args> { static constexpr auto name = _("*args"); };
+template <> struct handle_type_name<kwargs> { static constexpr auto name = _("**kwargs"); };
+
+template <typename type>
+struct pyobject_caster {
+    template <typename T = type, enable_if_t<std::is_same<T, handle>::value, int> = 0>
+    bool load(handle src, bool /* convert */) { value = src; return static_cast<bool>(value); }
+
+    template <typename T = type, enable_if_t<std::is_base_of<object, T>::value, int> = 0>
+    bool load(handle src, bool /* convert */) {
+        if (!isinstance<type>(src))
+            return false;
+        value = reinterpret_borrow<type>(src);
+        return true;
+    }
+
+    static handle cast(const handle &src, return_value_policy /* policy */, handle /* parent */) {
+        return src.inc_ref();
+    }
+    PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name);
+};
+
+template <typename T>
+class type_caster<T, enable_if_t<is_pyobject<T>::value>> : public pyobject_caster<T> { };
+
+// Our conditions for enabling moving are quite restrictive:
+// At compile time:
+// - T needs to be a non-const, non-pointer, non-reference type
+// - type_caster<T>::operator T&() must exist
+// - the type must be move constructible (obviously)
+// At run-time:
+// - if the type is non-copy-constructible, the object must be the sole owner of the type (i.e. it
+//   must have ref_count() == 1)h
+// If any of the above are not satisfied, we fall back to copying.
+template <typename T> using move_is_plain_type = satisfies_none_of<T,
+    std::is_void, std::is_pointer, std::is_reference, std::is_const
+>;
+template <typename T, typename SFINAE = void> struct move_always : std::false_type {};
+template <typename T> struct move_always<T, enable_if_t<all_of<
+    move_is_plain_type<T>,
+    negation<is_copy_constructible<T>>,
+    std::is_move_constructible<T>,
+    std::is_same<decltype(std::declval<make_caster<T>>().operator T&()), T&>
+>::value>> : std::true_type {};
+template <typename T, typename SFINAE = void> struct move_if_unreferenced : std::false_type {};
+template <typename T> struct move_if_unreferenced<T, enable_if_t<all_of<
+    move_is_plain_type<T>,
+    negation<move_always<T>>,
+    std::is_move_constructible<T>,
+    std::is_same<decltype(std::declval<make_caster<T>>().operator T&()), T&>
+>::value>> : std::true_type {};
+template <typename T> using move_never = none_of<move_always<T>, move_if_unreferenced<T>>;
+
+// Detect whether returning a `type` from a cast on type's type_caster is going to result in a
+// reference or pointer to a local variable of the type_caster.  Basically, only
+// non-reference/pointer `type`s and reference/pointers from a type_caster_generic are safe;
+// everything else returns a reference/pointer to a local variable.
+template <typename type> using cast_is_temporary_value_reference = bool_constant<
+    (std::is_reference<type>::value || std::is_pointer<type>::value) &&
+    !std::is_base_of<type_caster_generic, make_caster<type>>::value &&
+    !std::is_same<intrinsic_t<type>, void>::value
+>;
+
+// When a value returned from a C++ function is being cast back to Python, we almost always want to
+// force `policy = move`, regardless of the return value policy the function/method was declared
+// with.
+template <typename Return, typename SFINAE = void> struct return_value_policy_override {
+    static return_value_policy policy(return_value_policy p) { return p; }
+};
+
+template <typename Return> struct return_value_policy_override<Return,
+        detail::enable_if_t<std::is_base_of<type_caster_generic, make_caster<Return>>::value, void>> {
+    static return_value_policy policy(return_value_policy p) {
+        return !std::is_lvalue_reference<Return>::value &&
+               !std::is_pointer<Return>::value
+                   ? return_value_policy::move : p;
+    }
+};
+
+// Basic python -> C++ casting; throws if casting fails
+template <typename T, typename SFINAE> type_caster<T, SFINAE> &load_type(type_caster<T, SFINAE> &conv, const handle &handle) {
+    if (!conv.load(handle, true)) {
+#if defined(NDEBUG)
+        throw cast_error("Unable to cast Python instance to C++ type (compile in debug mode for details)");
+#else
+        throw cast_error("Unable to cast Python instance of type " +
+            (std::string) str(handle.get_type()) + " to C++ type '" + type_id<T>() + "'");
+#endif
+    }
+    return conv;
+}
+// Wrapper around the above that also constructs and returns a type_caster
+template <typename T> make_caster<T> load_type(const handle &handle) {
+    make_caster<T> conv;
+    load_type(conv, handle);
+    return conv;
+}
+
+NAMESPACE_END(detail)
+
+// pytype -> C++ type
+template <typename T, detail::enable_if_t<!detail::is_pyobject<T>::value, int> = 0>
+T cast(const handle &handle) {
+    using namespace detail;
+    static_assert(!cast_is_temporary_value_reference<T>::value,
+            "Unable to cast type to reference: value is local to type caster");
+    return cast_op<T>(load_type<T>(handle));
+}
+
+// pytype -> pytype (calls converting constructor)
+template <typename T, detail::enable_if_t<detail::is_pyobject<T>::value, int> = 0>
+T cast(const handle &handle) { return T(reinterpret_borrow<object>(handle)); }
+
+// C++ type -> py::object
+template <typename T, detail::enable_if_t<!detail::is_pyobject<T>::value, int> = 0>
+object cast(const T &value, return_value_policy policy = return_value_policy::automatic_reference,
+            handle parent = handle()) {
+    if (policy == return_value_policy::automatic)
+        policy = std::is_pointer<T>::value ? return_value_policy::take_ownership : return_value_policy::copy;
+    else if (policy == return_value_policy::automatic_reference)
+        policy = std::is_pointer<T>::value ? return_value_policy::reference : return_value_policy::copy;
+    return reinterpret_steal<object>(detail::make_caster<T>::cast(value, policy, parent));
+}
+
+template <typename T> T handle::cast() const { return pybind11::cast<T>(*this); }
+template <> inline void handle::cast() const { return; }
+
+template <typename T>
+detail::enable_if_t<!detail::move_never<T>::value, T> move(object &&obj) {
+    if (obj.ref_count() > 1)
+#if defined(NDEBUG)
+        throw cast_error("Unable to cast Python instance to C++ rvalue: instance has multiple references"
+            " (compile in debug mode for details)");
+#else
+        throw cast_error("Unable to move from Python " + (std::string) str(obj.get_type()) +
+                " instance to C++ " + type_id<T>() + " instance: instance has multiple references");
+#endif
+
+    // Move into a temporary and return that, because the reference may be a local value of `conv`
+    T ret = std::move(detail::load_type<T>(obj).operator T&());
+    return ret;
+}
+
+// Calling cast() on an rvalue calls pybind::cast with the object rvalue, which does:
+// - If we have to move (because T has no copy constructor), do it.  This will fail if the moved
+//   object has multiple references, but trying to copy will fail to compile.
+// - If both movable and copyable, check ref count: if 1, move; otherwise copy
+// - Otherwise (not movable), copy.
+template <typename T> detail::enable_if_t<detail::move_always<T>::value, T> cast(object &&object) {
+    return move<T>(std::move(object));
+}
+template <typename T> detail::enable_if_t<detail::move_if_unreferenced<T>::value, T> cast(object &&object) {
+    if (object.ref_count() > 1)
+        return cast<T>(object);
+    else
+        return move<T>(std::move(object));
+}
+template <typename T> detail::enable_if_t<detail::move_never<T>::value, T> cast(object &&object) {
+    return cast<T>(object);
+}
+
+template <typename T> T object::cast() const & { return pybind11::cast<T>(*this); }
+template <typename T> T object::cast() && { return pybind11::cast<T>(std::move(*this)); }
+template <> inline void object::cast() const & { return; }
+template <> inline void object::cast() && { return; }
+
+NAMESPACE_BEGIN(detail)
+
+// Declared in pytypes.h:
+template <typename T, enable_if_t<!is_pyobject<T>::value, int>>
+object object_or_cast(T &&o) { return pybind11::cast(std::forward<T>(o)); }
+
+struct overload_unused {}; // Placeholder type for the unneeded (and dead code) static variable in the OVERLOAD_INT macro
+template <typename ret_type> using overload_caster_t = conditional_t<
+    cast_is_temporary_value_reference<ret_type>::value, make_caster<ret_type>, overload_unused>;
+
+// Trampoline use: for reference/pointer types to value-converted values, we do a value cast, then
+// store the result in the given variable.  For other types, this is a no-op.
+template <typename T> enable_if_t<cast_is_temporary_value_reference<T>::value, T> cast_ref(object &&o, make_caster<T> &caster) {
+    return cast_op<T>(load_type(caster, o));
+}
+template <typename T> enable_if_t<!cast_is_temporary_value_reference<T>::value, T> cast_ref(object &&, overload_unused &) {
+    pybind11_fail("Internal error: cast_ref fallback invoked"); }
+
+// Trampoline use: Having a pybind11::cast with an invalid reference type is going to static_assert, even
+// though if it's in dead code, so we provide a "trampoline" to pybind11::cast that only does anything in
+// cases where pybind11::cast is valid.
+template <typename T> enable_if_t<!cast_is_temporary_value_reference<T>::value, T> cast_safe(object &&o) {
+    return pybind11::cast<T>(std::move(o)); }
+template <typename T> enable_if_t<cast_is_temporary_value_reference<T>::value, T> cast_safe(object &&) {
+    pybind11_fail("Internal error: cast_safe fallback invoked"); }
+template <> inline void cast_safe<void>(object &&) {}
+
+NAMESPACE_END(detail)
+
+template <return_value_policy policy = return_value_policy::automatic_reference>
+tuple make_tuple() { return tuple(0); }
+
+template <return_value_policy policy = return_value_policy::automatic_reference,
+          typename... Args> tuple make_tuple(Args&&... args_) {
+    constexpr size_t size = sizeof...(Args);
+    std::array<object, size> args {
+        { reinterpret_steal<object>(detail::make_caster<Args>::cast(
+            std::forward<Args>(args_), policy, nullptr))... }
+    };
+    for (size_t i = 0; i < args.size(); i++) {
+        if (!args[i]) {
+#if defined(NDEBUG)
+            throw cast_error("make_tuple(): unable to convert arguments to Python object (compile in debug mode for details)");
+#else
+            std::array<std::string, size> argtypes { {type_id<Args>()...} };
+            throw cast_error("make_tuple(): unable to convert argument of type '" +
+                argtypes[i] + "' to Python object");
+#endif
+        }
+    }
+    tuple result(size);
+    int counter = 0;
+    for (auto &arg_value : args)
+        PyTuple_SET_ITEM(result.ptr(), counter++, arg_value.release().ptr());
+    return result;
+}
+
+/// \ingroup annotations
+/// Annotation for arguments
+struct arg {
+    /// Constructs an argument with the name of the argument; if null or omitted, this is a positional argument.
+    constexpr explicit arg(const char *name = nullptr) : name(name), flag_noconvert(false), flag_none(true) { }
+    /// Assign a value to this argument
+    template <typename T> arg_v operator=(T &&value) const;
+    /// Indicate that the type should not be converted in the type caster
+    arg &noconvert(bool flag = true) { flag_noconvert = flag; return *this; }
+    /// Indicates that the argument should/shouldn't allow None (e.g. for nullable pointer args)
+    arg &none(bool flag = true) { flag_none = flag; return *this; }
+
+    const char *name; ///< If non-null, this is a named kwargs argument
+    bool flag_noconvert : 1; ///< If set, do not allow conversion (requires a supporting type caster!)
+    bool flag_none : 1; ///< If set (the default), allow None to be passed to this argument
+};
+
+/// \ingroup annotations
+/// Annotation for arguments with values
+struct arg_v : arg {
+private:
+    template <typename T>
+    arg_v(arg &&base, T &&x, const char *descr = nullptr)
+        : arg(base),
+          value(reinterpret_steal<object>(
+              detail::make_caster<T>::cast(x, return_value_policy::automatic, {})
+          )),
+          descr(descr)
+#if !defined(NDEBUG)
+        , type(type_id<T>())
+#endif
+    { }
+
+public:
+    /// Direct construction with name, default, and description
+    template <typename T>
+    arg_v(const char *name, T &&x, const char *descr = nullptr)
+        : arg_v(arg(name), std::forward<T>(x), descr) { }
+
+    /// Called internally when invoking `py::arg("a") = value`
+    template <typename T>
+    arg_v(const arg &base, T &&x, const char *descr = nullptr)
+        : arg_v(arg(base), std::forward<T>(x), descr) { }
+
+    /// Same as `arg::noconvert()`, but returns *this as arg_v&, not arg&
+    arg_v &noconvert(bool flag = true) { arg::noconvert(flag); return *this; }
+
+    /// Same as `arg::nonone()`, but returns *this as arg_v&, not arg&
+    arg_v &none(bool flag = true) { arg::none(flag); return *this; }
+
+    /// The default value
+    object value;
+    /// The (optional) description of the default value
+    const char *descr;
+#if !defined(NDEBUG)
+    /// The C++ type name of the default value (only available when compiled in debug mode)
+    std::string type;
+#endif
+};
+
+template <typename T>
+arg_v arg::operator=(T &&value) const { return {std::move(*this), std::forward<T>(value)}; }
+
+/// Alias for backward compatibility -- to be removed in version 2.0
+template <typename /*unused*/> using arg_t = arg_v;
+
+inline namespace literals {
+/** \rst
+    String literal version of `arg`
+ \endrst */
+constexpr arg operator"" _a(const char *name, size_t) { return arg(name); }
+}
+
+NAMESPACE_BEGIN(detail)
+
+// forward declaration (definition in attr.h)
+struct function_record;
+
+/// Internal data associated with a single function call
+struct function_call {
+    function_call(const function_record &f, handle p); // Implementation in attr.h
+
+    /// The function data:
+    const function_record &func;
+
+    /// Arguments passed to the function:
+    std::vector<handle> args;
+
+    /// The `convert` value the arguments should be loaded with
+    std::vector<bool> args_convert;
+
+    /// Extra references for the optional `py::args` and/or `py::kwargs` arguments (which, if
+    /// present, are also in `args` but without a reference).
+    object args_ref, kwargs_ref;
+
+    /// The parent, if any
+    handle parent;
+
+    /// If this is a call to an initializer, this argument contains `self`
+    handle init_self;
+};
+
+
+/// Helper class which loads arguments for C++ functions called from Python
+template <typename... Args>
+class argument_loader {
+    using indices = make_index_sequence<sizeof...(Args)>;
+
+    template <typename Arg> using argument_is_args   = std::is_same<intrinsic_t<Arg>, args>;
+    template <typename Arg> using argument_is_kwargs = std::is_same<intrinsic_t<Arg>, kwargs>;
+    // Get args/kwargs argument positions relative to the end of the argument list:
+    static constexpr auto args_pos = constexpr_first<argument_is_args, Args...>() - (int) sizeof...(Args),
+                        kwargs_pos = constexpr_first<argument_is_kwargs, Args...>() - (int) sizeof...(Args);
+
+    static constexpr bool args_kwargs_are_last = kwargs_pos >= - 1 && args_pos >= kwargs_pos - 1;
+
+    static_assert(args_kwargs_are_last, "py::args/py::kwargs are only permitted as the last argument(s) of a function");
+
+public:
+    static constexpr bool has_kwargs = kwargs_pos < 0;
+    static constexpr bool has_args = args_pos < 0;
+
+    static constexpr auto arg_names = concat(type_descr(make_caster<Args>::name)...);
+
+    bool load_args(function_call &call) {
+        return load_impl_sequence(call, indices{});
+    }
+
+    template <typename Return, typename Guard, typename Func>
+    enable_if_t<!std::is_void<Return>::value, Return> call(Func &&f) && {
+        return std::move(*this).template call_impl<Return>(std::forward<Func>(f), indices{}, Guard{});
+    }
+
+    template <typename Return, typename Guard, typename Func>
+    enable_if_t<std::is_void<Return>::value, void_type> call(Func &&f) && {
+        std::move(*this).template call_impl<Return>(std::forward<Func>(f), indices{}, Guard{});
+        return void_type();
+    }
+
+private:
+
+    static bool load_impl_sequence(function_call &, index_sequence<>) { return true; }
+
+    template <size_t... Is>
+    bool load_impl_sequence(function_call &call, index_sequence<Is...>) {
+#ifdef __cpp_fold_expressions
+        if ((... || !std::get<Is>(argcasters).load(call.args[Is], call.args_convert[Is])))
+            return false;
+#else
+        for (bool r : {std::get<Is>(argcasters).load(call.args[Is], call.args_convert[Is])...})
+            if (!r)
+                return false;
+#endif
+        return true;
+    }
+
+    template <typename Return, typename Func, size_t... Is, typename Guard>
+    Return call_impl(Func &&f, index_sequence<Is...>, Guard &&) && {
+        return std::forward<Func>(f)(cast_op<Args>(std::move(std::get<Is>(argcasters)))...);
+    }
+
+    std::tuple<make_caster<Args>...> argcasters;
+};
+
+/// Helper class which collects only positional arguments for a Python function call.
+/// A fancier version below can collect any argument, but this one is optimal for simple calls.
+template <return_value_policy policy>
+class simple_collector {
+public:
+    template <typename... Ts>
+    explicit simple_collector(Ts &&...values)
+        : m_args(pybind11::make_tuple<policy>(std::forward<Ts>(values)...)) { }
+
+    const tuple &args() const & { return m_args; }
+    dict kwargs() const { return {}; }
+
+    tuple args() && { return std::move(m_args); }
+
+    /// Call a Python function and pass the collected arguments
+    object call(PyObject *ptr) const {
+        PyObject *result = PyObject_CallObject(ptr, m_args.ptr());
+        if (!result)
+            throw error_already_set();
+        return reinterpret_steal<object>(result);
+    }
+
+private:
+    tuple m_args;
+};
+
+/// Helper class which collects positional, keyword, * and ** arguments for a Python function call
+template <return_value_policy policy>
+class unpacking_collector {
+public:
+    template <typename... Ts>
+    explicit unpacking_collector(Ts &&...values) {
+        // Tuples aren't (easily) resizable so a list is needed for collection,
+        // but the actual function call strictly requires a tuple.
+        auto args_list = list();
+        int _[] = { 0, (process(args_list, std::forward<Ts>(values)), 0)... };
+        ignore_unused(_);
+
+        m_args = std::move(args_list);
+    }
+
+    const tuple &args() const & { return m_args; }
+    const dict &kwargs() const & { return m_kwargs; }
+
+    tuple args() && { return std::move(m_args); }
+    dict kwargs() && { return std::move(m_kwargs); }
+
+    /// Call a Python function and pass the collected arguments
+    object call(PyObject *ptr) const {
+        PyObject *result = PyObject_Call(ptr, m_args.ptr(), m_kwargs.ptr());
+        if (!result)
+            throw error_already_set();
+        return reinterpret_steal<object>(result);
+    }
+
+private:
+    template <typename T>
+    void process(list &args_list, T &&x) {
+        auto o = reinterpret_steal<object>(detail::make_caster<T>::cast(std::forward<T>(x), policy, {}));
+        if (!o) {
+#if defined(NDEBUG)
+            argument_cast_error();
+#else
+            argument_cast_error(std::to_string(args_list.size()), type_id<T>());
+#endif
+        }
+        args_list.append(o);
+    }
+
+    void process(list &args_list, detail::args_proxy ap) {
+        for (const auto &a : ap)
+            args_list.append(a);
+    }
+
+    void process(list &/*args_list*/, arg_v a) {
+        if (!a.name)
+#if defined(NDEBUG)
+            nameless_argument_error();
+#else
+            nameless_argument_error(a.type);
+#endif
+
+        if (m_kwargs.contains(a.name)) {
+#if defined(NDEBUG)
+            multiple_values_error();
+#else
+            multiple_values_error(a.name);
+#endif
+        }
+        if (!a.value) {
+#if defined(NDEBUG)
+            argument_cast_error();
+#else
+            argument_cast_error(a.name, a.type);
+#endif
+        }
+        m_kwargs[a.name] = a.value;
+    }
+
+    void process(list &/*args_list*/, detail::kwargs_proxy kp) {
+        if (!kp)
+            return;
+        for (const auto &k : reinterpret_borrow<dict>(kp)) {
+            if (m_kwargs.contains(k.first)) {
+#if defined(NDEBUG)
+                multiple_values_error();
+#else
+                multiple_values_error(str(k.first));
+#endif
+            }
+            m_kwargs[k.first] = k.second;
+        }
+    }
+
+    [[noreturn]] static void nameless_argument_error() {
+        throw type_error("Got kwargs without a name; only named arguments "
+                         "may be passed via py::arg() to a python function call. "
+                         "(compile in debug mode for details)");
+    }
+    [[noreturn]] static void nameless_argument_error(std::string type) {
+        throw type_error("Got kwargs without a name of type '" + type + "'; only named "
+                         "arguments may be passed via py::arg() to a python function call. ");
+    }
+    [[noreturn]] static void multiple_values_error() {
+        throw type_error("Got multiple values for keyword argument "
+                         "(compile in debug mode for details)");
+    }
+
+    [[noreturn]] static void multiple_values_error(std::string name) {
+        throw type_error("Got multiple values for keyword argument '" + name + "'");
+    }
+
+    [[noreturn]] static void argument_cast_error() {
+        throw cast_error("Unable to convert call argument to Python object "
+                         "(compile in debug mode for details)");
+    }
+
+    [[noreturn]] static void argument_cast_error(std::string name, std::string type) {
+        throw cast_error("Unable to convert call argument '" + name
+                         + "' of type '" + type + "' to Python object");
+    }
+
+private:
+    tuple m_args;
+    dict m_kwargs;
+};
+
+/// Collect only positional arguments for a Python function call
+template <return_value_policy policy, typename... Args,
+          typename = enable_if_t<all_of<is_positional<Args>...>::value>>
+simple_collector<policy> collect_arguments(Args &&...args) {
+    return simple_collector<policy>(std::forward<Args>(args)...);
+}
+
+/// Collect all arguments, including keywords and unpacking (only instantiated when needed)
+template <return_value_policy policy, typename... Args,
+          typename = enable_if_t<!all_of<is_positional<Args>...>::value>>
+unpacking_collector<policy> collect_arguments(Args &&...args) {
+    // Following argument order rules for generalized unpacking according to PEP 448
+    static_assert(
+        constexpr_last<is_positional, Args...>() < constexpr_first<is_keyword_or_ds, Args...>()
+        && constexpr_last<is_s_unpacking, Args...>() < constexpr_first<is_ds_unpacking, Args...>(),
+        "Invalid function call: positional args must precede keywords and ** unpacking; "
+        "* unpacking must precede ** unpacking"
+    );
+    return unpacking_collector<policy>(std::forward<Args>(args)...);
+}
+
+template <typename Derived>
+template <return_value_policy policy, typename... Args>
+object object_api<Derived>::operator()(Args &&...args) const {
+    return detail::collect_arguments<policy>(std::forward<Args>(args)...).call(derived().ptr());
+}
+
+template <typename Derived>
+template <return_value_policy policy, typename... Args>
+object object_api<Derived>::call(Args &&...args) const {
+    return operator()<policy>(std::forward<Args>(args)...);
+}
+
+NAMESPACE_END(detail)
+
+#define PYBIND11_MAKE_OPAQUE(...) \
+    namespace pybind11 { namespace detail { \
+        template<> class type_caster<__VA_ARGS__> : public type_caster_base<__VA_ARGS__> { }; \
+    }}
+
+/// Lets you pass a type containing a `,` through a macro parameter without needing a separate
+/// typedef, e.g.: `PYBIND11_OVERLOAD(PYBIND11_TYPE(ReturnType<A, B>), PYBIND11_TYPE(Parent<C, D>), f, arg)`
+#define PYBIND11_TYPE(...) __VA_ARGS__
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/chrono.h b/3rdparty/pybind11/include/pybind11/chrono.h
new file mode 100644
index 00000000..ea777e69
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/chrono.h
@@ -0,0 +1,184 @@
+/*
+    pybind11/chrono.h: Transparent conversion between std::chrono and python's datetime
+
+    Copyright (c) 2016 Trent Houliston <trent@houliston.me> and
+                       Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+#include <cmath>
+#include <ctime>
+#include <chrono>
+#include <datetime.h>
+
+// Backport the PyDateTime_DELTA functions from Python3.3 if required
+#ifndef PyDateTime_DELTA_GET_DAYS
+#define PyDateTime_DELTA_GET_DAYS(o)         (((PyDateTime_Delta*)o)->days)
+#endif
+#ifndef PyDateTime_DELTA_GET_SECONDS
+#define PyDateTime_DELTA_GET_SECONDS(o)      (((PyDateTime_Delta*)o)->seconds)
+#endif
+#ifndef PyDateTime_DELTA_GET_MICROSECONDS
+#define PyDateTime_DELTA_GET_MICROSECONDS(o) (((PyDateTime_Delta*)o)->microseconds)
+#endif
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+template <typename type> class duration_caster {
+public:
+    typedef typename type::rep rep;
+    typedef typename type::period period;
+
+    typedef std::chrono::duration<uint_fast32_t, std::ratio<86400>> days;
+
+    bool load(handle src, bool) {
+        using namespace std::chrono;
+
+        // Lazy initialise the PyDateTime import
+        if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
+
+        if (!src) return false;
+        // If invoked with datetime.delta object
+        if (PyDelta_Check(src.ptr())) {
+            value = type(duration_cast<duration<rep, period>>(
+                  days(PyDateTime_DELTA_GET_DAYS(src.ptr()))
+                + seconds(PyDateTime_DELTA_GET_SECONDS(src.ptr()))
+                + microseconds(PyDateTime_DELTA_GET_MICROSECONDS(src.ptr()))));
+            return true;
+        }
+        // If invoked with a float we assume it is seconds and convert
+        else if (PyFloat_Check(src.ptr())) {
+            value = type(duration_cast<duration<rep, period>>(duration<double>(PyFloat_AsDouble(src.ptr()))));
+            return true;
+        }
+        else return false;
+    }
+
+    // If this is a duration just return it back
+    static const std::chrono::duration<rep, period>& get_duration(const std::chrono::duration<rep, period> &src) {
+        return src;
+    }
+
+    // If this is a time_point get the time_since_epoch
+    template <typename Clock> static std::chrono::duration<rep, period> get_duration(const std::chrono::time_point<Clock, std::chrono::duration<rep, period>> &src) {
+        return src.time_since_epoch();
+    }
+
+    static handle cast(const type &src, return_value_policy /* policy */, handle /* parent */) {
+        using namespace std::chrono;
+
+        // Use overloaded function to get our duration from our source
+        // Works out if it is a duration or time_point and get the duration
+        auto d = get_duration(src);
+
+        // Lazy initialise the PyDateTime import
+        if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
+
+        // Declare these special duration types so the conversions happen with the correct primitive types (int)
+        using dd_t = duration<int, std::ratio<86400>>;
+        using ss_t = duration<int, std::ratio<1>>;
+        using us_t = duration<int, std::micro>;
+
+        auto dd = duration_cast<dd_t>(d);
+        auto subd = d - dd;
+        auto ss = duration_cast<ss_t>(subd);
+        auto us = duration_cast<us_t>(subd - ss);
+        return PyDelta_FromDSU(dd.count(), ss.count(), us.count());
+    }
+
+    PYBIND11_TYPE_CASTER(type, _("datetime.timedelta"));
+};
+
+// This is for casting times on the system clock into datetime.datetime instances
+template <typename Duration> class type_caster<std::chrono::time_point<std::chrono::system_clock, Duration>> {
+public:
+    typedef std::chrono::time_point<std::chrono::system_clock, Duration> type;
+    bool load(handle src, bool) {
+        using namespace std::chrono;
+
+        // Lazy initialise the PyDateTime import
+        if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
+
+        if (!src) return false;
+
+        std::tm cal;
+        microseconds msecs;
+
+        if (PyDateTime_Check(src.ptr())) {
+            cal.tm_sec   = PyDateTime_DATE_GET_SECOND(src.ptr());
+            cal.tm_min   = PyDateTime_DATE_GET_MINUTE(src.ptr());
+            cal.tm_hour  = PyDateTime_DATE_GET_HOUR(src.ptr());
+            cal.tm_mday  = PyDateTime_GET_DAY(src.ptr());
+            cal.tm_mon   = PyDateTime_GET_MONTH(src.ptr()) - 1;
+            cal.tm_year  = PyDateTime_GET_YEAR(src.ptr()) - 1900;
+            cal.tm_isdst = -1;
+            msecs        = microseconds(PyDateTime_DATE_GET_MICROSECOND(src.ptr()));
+        } else if (PyDate_Check(src.ptr())) {
+            cal.tm_sec   = 0;
+            cal.tm_min   = 0;
+            cal.tm_hour  = 0;
+            cal.tm_mday  = PyDateTime_GET_DAY(src.ptr());
+            cal.tm_mon   = PyDateTime_GET_MONTH(src.ptr()) - 1;
+            cal.tm_year  = PyDateTime_GET_YEAR(src.ptr()) - 1900;
+            cal.tm_isdst = -1;
+            msecs        = microseconds(0);
+        } else if (PyTime_Check(src.ptr())) {
+            cal.tm_sec   = PyDateTime_TIME_GET_SECOND(src.ptr());
+            cal.tm_min   = PyDateTime_TIME_GET_MINUTE(src.ptr());
+            cal.tm_hour  = PyDateTime_TIME_GET_HOUR(src.ptr());
+            cal.tm_mday  = 1;   // This date (day, month, year) = (1, 0, 70)
+            cal.tm_mon   = 0;   // represents 1-Jan-1970, which is the first
+            cal.tm_year  = 70;  // earliest available date for Python's datetime
+            cal.tm_isdst = -1;
+            msecs        = microseconds(PyDateTime_TIME_GET_MICROSECOND(src.ptr()));
+        }
+        else return false;
+
+        value = system_clock::from_time_t(std::mktime(&cal)) + msecs;
+        return true;
+    }
+
+    static handle cast(const std::chrono::time_point<std::chrono::system_clock, Duration> &src, return_value_policy /* policy */, handle /* parent */) {
+        using namespace std::chrono;
+
+        // Lazy initialise the PyDateTime import
+        if (!PyDateTimeAPI) { PyDateTime_IMPORT; }
+
+        std::time_t tt = system_clock::to_time_t(time_point_cast<system_clock::duration>(src));
+        // this function uses static memory so it's best to copy it out asap just in case
+        // otherwise other code that is using localtime may break this (not just python code)
+        std::tm localtime = *std::localtime(&tt);
+
+        // Declare these special duration types so the conversions happen with the correct primitive types (int)
+        using us_t = duration<int, std::micro>;
+
+        return PyDateTime_FromDateAndTime(localtime.tm_year + 1900,
+                                          localtime.tm_mon + 1,
+                                          localtime.tm_mday,
+                                          localtime.tm_hour,
+                                          localtime.tm_min,
+                                          localtime.tm_sec,
+                                          (duration_cast<us_t>(src.time_since_epoch() % seconds(1))).count());
+    }
+    PYBIND11_TYPE_CASTER(type, _("datetime.datetime"));
+};
+
+// Other clocks that are not the system clock are not measured as datetime.datetime objects
+// since they are not measured on calendar time. So instead we just make them timedeltas
+// Or if they have passed us a time as a float we convert that
+template <typename Clock, typename Duration> class type_caster<std::chrono::time_point<Clock, Duration>>
+: public duration_caster<std::chrono::time_point<Clock, Duration>> {
+};
+
+template <typename Rep, typename Period> class type_caster<std::chrono::duration<Rep, Period>>
+: public duration_caster<std::chrono::duration<Rep, Period>> {
+};
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/common.h b/3rdparty/pybind11/include/pybind11/common.h
new file mode 100644
index 00000000..6c8a4f1e
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/common.h
@@ -0,0 +1,2 @@
+#include "detail/common.h"
+#warning "Including 'common.h' is deprecated. It will be removed in v3.0. Use 'pybind11.h'."
diff --git a/3rdparty/pybind11/include/pybind11/complex.h b/3rdparty/pybind11/include/pybind11/complex.h
new file mode 100644
index 00000000..3f896385
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/complex.h
@@ -0,0 +1,65 @@
+/*
+    pybind11/complex.h: Complex number support
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+#include <complex>
+
+/// glibc defines I as a macro which breaks things, e.g., boost template names
+#ifdef I
+#  undef I
+#endif
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+template <typename T> struct format_descriptor<std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>> {
+    static constexpr const char c = format_descriptor<T>::c;
+    static constexpr const char value[3] = { 'Z', c, '\0' };
+    static std::string format() { return std::string(value); }
+};
+
+#ifndef PYBIND11_CPP17
+
+template <typename T> constexpr const char format_descriptor<
+    std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>>::value[3];
+
+#endif
+
+NAMESPACE_BEGIN(detail)
+
+template <typename T> struct is_fmt_numeric<std::complex<T>, detail::enable_if_t<std::is_floating_point<T>::value>> {
+    static constexpr bool value = true;
+    static constexpr int index = is_fmt_numeric<T>::index + 3;
+};
+
+template <typename T> class type_caster<std::complex<T>> {
+public:
+    bool load(handle src, bool convert) {
+        if (!src)
+            return false;
+        if (!convert && !PyComplex_Check(src.ptr()))
+            return false;
+        Py_complex result = PyComplex_AsCComplex(src.ptr());
+        if (result.real == -1.0 && PyErr_Occurred()) {
+            PyErr_Clear();
+            return false;
+        }
+        value = std::complex<T>((T) result.real, (T) result.imag);
+        return true;
+    }
+
+    static handle cast(const std::complex<T> &src, return_value_policy /* policy */, handle /* parent */) {
+        return PyComplex_FromDoubles((double) src.real(), (double) src.imag());
+    }
+
+    PYBIND11_TYPE_CASTER(std::complex<T>, _("complex"));
+};
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/detail/class.h b/3rdparty/pybind11/include/pybind11/detail/class.h
new file mode 100644
index 00000000..edfa7de6
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/detail/class.h
@@ -0,0 +1,639 @@
+/*
+    pybind11/detail/class.h: Python C API implementation details for py::class_
+
+    Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "../attr.h"
+#include "../options.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+#if PY_VERSION_HEX >= 0x03030000
+#  define PYBIND11_BUILTIN_QUALNAME
+#  define PYBIND11_SET_OLDPY_QUALNAME(obj, nameobj)
+#else
+// In pre-3.3 Python, we still set __qualname__ so that we can produce reliable function type
+// signatures; in 3.3+ this macro expands to nothing:
+#  define PYBIND11_SET_OLDPY_QUALNAME(obj, nameobj) setattr((PyObject *) obj, "__qualname__", nameobj)
+#endif
+
+inline PyTypeObject *type_incref(PyTypeObject *type) {
+    Py_INCREF(type);
+    return type;
+}
+
+#if !defined(PYPY_VERSION)
+
+/// `pybind11_static_property.__get__()`: Always pass the class instead of the instance.
+extern "C" inline PyObject *pybind11_static_get(PyObject *self, PyObject * /*ob*/, PyObject *cls) {
+    return PyProperty_Type.tp_descr_get(self, cls, cls);
+}
+
+/// `pybind11_static_property.__set__()`: Just like the above `__get__()`.
+extern "C" inline int pybind11_static_set(PyObject *self, PyObject *obj, PyObject *value) {
+    PyObject *cls = PyType_Check(obj) ? obj : (PyObject *) Py_TYPE(obj);
+    return PyProperty_Type.tp_descr_set(self, cls, value);
+}
+
+/** A `static_property` is the same as a `property` but the `__get__()` and `__set__()`
+    methods are modified to always use the object type instead of a concrete instance.
+    Return value: New reference. */
+inline PyTypeObject *make_static_property_type() {
+    constexpr auto *name = "pybind11_static_property";
+    auto name_obj = reinterpret_steal<object>(PYBIND11_FROM_STRING(name));
+
+    /* Danger zone: from now (and until PyType_Ready), make sure to
+       issue no Python C API calls which could potentially invoke the
+       garbage collector (the GC will call type_traverse(), which will in
+       turn find the newly constructed type in an invalid state) */
+    auto heap_type = (PyHeapTypeObject *) PyType_Type.tp_alloc(&PyType_Type, 0);
+    if (!heap_type)
+        pybind11_fail("make_static_property_type(): error allocating type!");
+
+    heap_type->ht_name = name_obj.inc_ref().ptr();
+#ifdef PYBIND11_BUILTIN_QUALNAME
+    heap_type->ht_qualname = name_obj.inc_ref().ptr();
+#endif
+
+    auto type = &heap_type->ht_type;
+    type->tp_name = name;
+    type->tp_base = type_incref(&PyProperty_Type);
+    type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
+    type->tp_descr_get = pybind11_static_get;
+    type->tp_descr_set = pybind11_static_set;
+
+    if (PyType_Ready(type) < 0)
+        pybind11_fail("make_static_property_type(): failure in PyType_Ready()!");
+
+    setattr((PyObject *) type, "__module__", str("pybind11_builtins"));
+    PYBIND11_SET_OLDPY_QUALNAME(type, name_obj);
+
+    return type;
+}
+
+#else // PYPY
+
+/** PyPy has some issues with the above C API, so we evaluate Python code instead.
+    This function will only be called once so performance isn't really a concern.
+    Return value: New reference. */
+inline PyTypeObject *make_static_property_type() {
+    auto d = dict();
+    PyObject *result = PyRun_String(R"(\
+        class pybind11_static_property(property):
+            def __get__(self, obj, cls):
+                return property.__get__(self, cls, cls)
+
+            def __set__(self, obj, value):
+                cls = obj if isinstance(obj, type) else type(obj)
+                property.__set__(self, cls, value)
+        )", Py_file_input, d.ptr(), d.ptr()
+    );
+    if (result == nullptr)
+        throw error_already_set();
+    Py_DECREF(result);
+    return (PyTypeObject *) d["pybind11_static_property"].cast<object>().release().ptr();
+}
+
+#endif // PYPY
+
+/** Types with static properties need to handle `Type.static_prop = x` in a specific way.
+    By default, Python replaces the `static_property` itself, but for wrapped C++ types
+    we need to call `static_property.__set__()` in order to propagate the new value to
+    the underlying C++ data structure. */
+extern "C" inline int pybind11_meta_setattro(PyObject* obj, PyObject* name, PyObject* value) {
+    // Use `_PyType_Lookup()` instead of `PyObject_GetAttr()` in order to get the raw
+    // descriptor (`property`) instead of calling `tp_descr_get` (`property.__get__()`).
+    PyObject *descr = _PyType_Lookup((PyTypeObject *) obj, name);
+
+    // The following assignment combinations are possible:
+    //   1. `Type.static_prop = value`             --> descr_set: `Type.static_prop.__set__(value)`
+    //   2. `Type.static_prop = other_static_prop` --> setattro:  replace existing `static_prop`
+    //   3. `Type.regular_attribute = value`       --> setattro:  regular attribute assignment
+    const auto static_prop = (PyObject *) get_internals().static_property_type;
+    const auto call_descr_set = descr && PyObject_IsInstance(descr, static_prop)
+                                && !PyObject_IsInstance(value, static_prop);
+    if (call_descr_set) {
+        // Call `static_property.__set__()` instead of replacing the `static_property`.
+#if !defined(PYPY_VERSION)
+        return Py_TYPE(descr)->tp_descr_set(descr, obj, value);
+#else
+        if (PyObject *result = PyObject_CallMethod(descr, "__set__", "OO", obj, value)) {
+            Py_DECREF(result);
+            return 0;
+        } else {
+            return -1;
+        }
+#endif
+    } else {
+        // Replace existing attribute.
+        return PyType_Type.tp_setattro(obj, name, value);
+    }
+}
+
+#if PY_MAJOR_VERSION >= 3
+/**
+ * Python 3's PyInstanceMethod_Type hides itself via its tp_descr_get, which prevents aliasing
+ * methods via cls.attr("m2") = cls.attr("m1"): instead the tp_descr_get returns a plain function,
+ * when called on a class, or a PyMethod, when called on an instance.  Override that behaviour here
+ * to do a special case bypass for PyInstanceMethod_Types.
+ */
+extern "C" inline PyObject *pybind11_meta_getattro(PyObject *obj, PyObject *name) {
+    PyObject *descr = _PyType_Lookup((PyTypeObject *) obj, name);
+    if (descr && PyInstanceMethod_Check(descr)) {
+        Py_INCREF(descr);
+        return descr;
+    }
+    else {
+        return PyType_Type.tp_getattro(obj, name);
+    }
+}
+#endif
+
+/** This metaclass is assigned by default to all pybind11 types and is required in order
+    for static properties to function correctly. Users may override this using `py::metaclass`.
+    Return value: New reference. */
+inline PyTypeObject* make_default_metaclass() {
+    constexpr auto *name = "pybind11_type";
+    auto name_obj = reinterpret_steal<object>(PYBIND11_FROM_STRING(name));
+
+    /* Danger zone: from now (and until PyType_Ready), make sure to
+       issue no Python C API calls which could potentially invoke the
+       garbage collector (the GC will call type_traverse(), which will in
+       turn find the newly constructed type in an invalid state) */
+    auto heap_type = (PyHeapTypeObject *) PyType_Type.tp_alloc(&PyType_Type, 0);
+    if (!heap_type)
+        pybind11_fail("make_default_metaclass(): error allocating metaclass!");
+
+    heap_type->ht_name = name_obj.inc_ref().ptr();
+#ifdef PYBIND11_BUILTIN_QUALNAME
+    heap_type->ht_qualname = name_obj.inc_ref().ptr();
+#endif
+
+    auto type = &heap_type->ht_type;
+    type->tp_name = name;
+    type->tp_base = type_incref(&PyType_Type);
+    type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
+
+    type->tp_setattro = pybind11_meta_setattro;
+#if PY_MAJOR_VERSION >= 3
+    type->tp_getattro = pybind11_meta_getattro;
+#endif
+
+    if (PyType_Ready(type) < 0)
+        pybind11_fail("make_default_metaclass(): failure in PyType_Ready()!");
+
+    setattr((PyObject *) type, "__module__", str("pybind11_builtins"));
+    PYBIND11_SET_OLDPY_QUALNAME(type, name_obj);
+
+    return type;
+}
+
+/// For multiple inheritance types we need to recursively register/deregister base pointers for any
+/// base classes with pointers that are difference from the instance value pointer so that we can
+/// correctly recognize an offset base class pointer. This calls a function with any offset base ptrs.
+inline void traverse_offset_bases(void *valueptr, const detail::type_info *tinfo, instance *self,
+        bool (*f)(void * /*parentptr*/, instance * /*self*/)) {
+    for (handle h : reinterpret_borrow<tuple>(tinfo->type->tp_bases)) {
+        if (auto parent_tinfo = get_type_info((PyTypeObject *) h.ptr())) {
+            for (auto &c : parent_tinfo->implicit_casts) {
+                if (c.first == tinfo->cpptype) {
+                    auto *parentptr = c.second(valueptr);
+                    if (parentptr != valueptr)
+                        f(parentptr, self);
+                    traverse_offset_bases(parentptr, parent_tinfo, self, f);
+                    break;
+                }
+            }
+        }
+    }
+}
+
+inline bool register_instance_impl(void *ptr, instance *self) {
+    get_internals().registered_instances.emplace(ptr, self);
+    return true; // unused, but gives the same signature as the deregister func
+}
+inline bool deregister_instance_impl(void *ptr, instance *self) {
+    auto &registered_instances = get_internals().registered_instances;
+    auto range = registered_instances.equal_range(ptr);
+    for (auto it = range.first; it != range.second; ++it) {
+        if (Py_TYPE(self) == Py_TYPE(it->second)) {
+            registered_instances.erase(it);
+            return true;
+        }
+    }
+    return false;
+}
+
+inline void register_instance(instance *self, void *valptr, const type_info *tinfo) {
+    register_instance_impl(valptr, self);
+    if (!tinfo->simple_ancestors)
+        traverse_offset_bases(valptr, tinfo, self, register_instance_impl);
+}
+
+inline bool deregister_instance(instance *self, void *valptr, const type_info *tinfo) {
+    bool ret = deregister_instance_impl(valptr, self);
+    if (!tinfo->simple_ancestors)
+        traverse_offset_bases(valptr, tinfo, self, deregister_instance_impl);
+    return ret;
+}
+
+/// Instance creation function for all pybind11 types. It allocates the internal instance layout for
+/// holding C++ objects and holders.  Allocation is done lazily (the first time the instance is cast
+/// to a reference or pointer), and initialization is done by an `__init__` function.
+inline PyObject *make_new_instance(PyTypeObject *type) {
+#if defined(PYPY_VERSION)
+    // PyPy gets tp_basicsize wrong (issue 2482) under multiple inheritance when the first inherited
+    // object is a a plain Python type (i.e. not derived from an extension type).  Fix it.
+    ssize_t instance_size = static_cast<ssize_t>(sizeof(instance));
+    if (type->tp_basicsize < instance_size) {
+        type->tp_basicsize = instance_size;
+    }
+#endif
+    PyObject *self = type->tp_alloc(type, 0);
+    auto inst = reinterpret_cast<instance *>(self);
+    // Allocate the value/holder internals:
+    inst->allocate_layout();
+
+    inst->owned = true;
+
+    return self;
+}
+
+/// Instance creation function for all pybind11 types. It only allocates space for the
+/// C++ object, but doesn't call the constructor -- an `__init__` function must do that.
+extern "C" inline PyObject *pybind11_object_new(PyTypeObject *type, PyObject *, PyObject *) {
+    return make_new_instance(type);
+}
+
+/// An `__init__` function constructs the C++ object. Users should provide at least one
+/// of these using `py::init` or directly with `.def(__init__, ...)`. Otherwise, the
+/// following default function will be used which simply throws an exception.
+extern "C" inline int pybind11_object_init(PyObject *self, PyObject *, PyObject *) {
+    PyTypeObject *type = Py_TYPE(self);
+    std::string msg;
+#if defined(PYPY_VERSION)
+    msg += handle((PyObject *) type).attr("__module__").cast<std::string>() + ".";
+#endif
+    msg += type->tp_name;
+    msg += ": No constructor defined!";
+    PyErr_SetString(PyExc_TypeError, msg.c_str());
+    return -1;
+}
+
+inline void add_patient(PyObject *nurse, PyObject *patient) {
+    auto &internals = get_internals();
+    auto instance = reinterpret_cast<detail::instance *>(nurse);
+    instance->has_patients = true;
+    Py_INCREF(patient);
+    internals.patients[nurse].push_back(patient);
+}
+
+inline void clear_patients(PyObject *self) {
+    auto instance = reinterpret_cast<detail::instance *>(self);
+    auto &internals = get_internals();
+    auto pos = internals.patients.find(self);
+    assert(pos != internals.patients.end());
+    // Clearing the patients can cause more Python code to run, which
+    // can invalidate the iterator. Extract the vector of patients
+    // from the unordered_map first.
+    auto patients = std::move(pos->second);
+    internals.patients.erase(pos);
+    instance->has_patients = false;
+    for (PyObject *&patient : patients)
+        Py_CLEAR(patient);
+}
+
+/// Clears all internal data from the instance and removes it from registered instances in
+/// preparation for deallocation.
+inline void clear_instance(PyObject *self) {
+    auto instance = reinterpret_cast<detail::instance *>(self);
+
+    // Deallocate any values/holders, if present:
+    for (auto &v_h : values_and_holders(instance)) {
+        if (v_h) {
+
+            // We have to deregister before we call dealloc because, for virtual MI types, we still
+            // need to be able to get the parent pointers.
+            if (v_h.instance_registered() && !deregister_instance(instance, v_h.value_ptr(), v_h.type))
+                pybind11_fail("pybind11_object_dealloc(): Tried to deallocate unregistered instance!");
+
+            if (instance->owned || v_h.holder_constructed())
+                v_h.type->dealloc(v_h);
+        }
+    }
+    // Deallocate the value/holder layout internals:
+    instance->deallocate_layout();
+
+    if (instance->weakrefs)
+        PyObject_ClearWeakRefs(self);
+
+    PyObject **dict_ptr = _PyObject_GetDictPtr(self);
+    if (dict_ptr)
+        Py_CLEAR(*dict_ptr);
+
+    if (instance->has_patients)
+        clear_patients(self);
+}
+
+/// Instance destructor function for all pybind11 types. It calls `type_info.dealloc`
+/// to destroy the C++ object itself, while the rest is Python bookkeeping.
+extern "C" inline void pybind11_object_dealloc(PyObject *self) {
+    clear_instance(self);
+
+    auto type = Py_TYPE(self);
+    type->tp_free(self);
+
+#if PY_VERSION_HEX < 0x03080000
+    // `type->tp_dealloc != pybind11_object_dealloc` means that we're being called
+    // as part of a derived type's dealloc, in which case we're not allowed to decref
+    // the type here. For cross-module compatibility, we shouldn't compare directly
+    // with `pybind11_object_dealloc`, but with the common one stashed in internals.
+    auto pybind11_object_type = (PyTypeObject *) get_internals().instance_base;
+    if (type->tp_dealloc == pybind11_object_type->tp_dealloc)
+        Py_DECREF(type);
+#else
+    // This was not needed before Python 3.8 (Python issue 35810)
+    // https://github.com/pybind/pybind11/issues/1946
+    Py_DECREF(type);
+#endif
+}
+
+/** Create the type which can be used as a common base for all classes.  This is
+    needed in order to satisfy Python's requirements for multiple inheritance.
+    Return value: New reference. */
+inline PyObject *make_object_base_type(PyTypeObject *metaclass) {
+    constexpr auto *name = "pybind11_object";
+    auto name_obj = reinterpret_steal<object>(PYBIND11_FROM_STRING(name));
+
+    /* Danger zone: from now (and until PyType_Ready), make sure to
+       issue no Python C API calls which could potentially invoke the
+       garbage collector (the GC will call type_traverse(), which will in
+       turn find the newly constructed type in an invalid state) */
+    auto heap_type = (PyHeapTypeObject *) metaclass->tp_alloc(metaclass, 0);
+    if (!heap_type)
+        pybind11_fail("make_object_base_type(): error allocating type!");
+
+    heap_type->ht_name = name_obj.inc_ref().ptr();
+#ifdef PYBIND11_BUILTIN_QUALNAME
+    heap_type->ht_qualname = name_obj.inc_ref().ptr();
+#endif
+
+    auto type = &heap_type->ht_type;
+    type->tp_name = name;
+    type->tp_base = type_incref(&PyBaseObject_Type);
+    type->tp_basicsize = static_cast<ssize_t>(sizeof(instance));
+    type->tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
+
+    type->tp_new = pybind11_object_new;
+    type->tp_init = pybind11_object_init;
+    type->tp_dealloc = pybind11_object_dealloc;
+
+    /* Support weak references (needed for the keep_alive feature) */
+    type->tp_weaklistoffset = offsetof(instance, weakrefs);
+
+    if (PyType_Ready(type) < 0)
+        pybind11_fail("PyType_Ready failed in make_object_base_type():" + error_string());
+
+    setattr((PyObject *) type, "__module__", str("pybind11_builtins"));
+    PYBIND11_SET_OLDPY_QUALNAME(type, name_obj);
+
+    assert(!PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC));
+    return (PyObject *) heap_type;
+}
+
+/// dynamic_attr: Support for `d = instance.__dict__`.
+extern "C" inline PyObject *pybind11_get_dict(PyObject *self, void *) {
+    PyObject *&dict = *_PyObject_GetDictPtr(self);
+    if (!dict)
+        dict = PyDict_New();
+    Py_XINCREF(dict);
+    return dict;
+}
+
+/// dynamic_attr: Support for `instance.__dict__ = dict()`.
+extern "C" inline int pybind11_set_dict(PyObject *self, PyObject *new_dict, void *) {
+    if (!PyDict_Check(new_dict)) {
+        PyErr_Format(PyExc_TypeError, "__dict__ must be set to a dictionary, not a '%.200s'",
+                     Py_TYPE(new_dict)->tp_name);
+        return -1;
+    }
+    PyObject *&dict = *_PyObject_GetDictPtr(self);
+    Py_INCREF(new_dict);
+    Py_CLEAR(dict);
+    dict = new_dict;
+    return 0;
+}
+
+/// dynamic_attr: Allow the garbage collector to traverse the internal instance `__dict__`.
+extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *arg) {
+    PyObject *&dict = *_PyObject_GetDictPtr(self);
+    Py_VISIT(dict);
+    return 0;
+}
+
+/// dynamic_attr: Allow the GC to clear the dictionary.
+extern "C" inline int pybind11_clear(PyObject *self) {
+    PyObject *&dict = *_PyObject_GetDictPtr(self);
+    Py_CLEAR(dict);
+    return 0;
+}
+
+/// Give instances of this type a `__dict__` and opt into garbage collection.
+inline void enable_dynamic_attributes(PyHeapTypeObject *heap_type) {
+    auto type = &heap_type->ht_type;
+#if defined(PYPY_VERSION)
+    pybind11_fail(std::string(type->tp_name) + ": dynamic attributes are "
+                                               "currently not supported in "
+                                               "conjunction with PyPy!");
+#endif
+    type->tp_flags |= Py_TPFLAGS_HAVE_GC;
+    type->tp_dictoffset = type->tp_basicsize; // place dict at the end
+    type->tp_basicsize += (ssize_t)sizeof(PyObject *); // and allocate enough space for it
+    type->tp_traverse = pybind11_traverse;
+    type->tp_clear = pybind11_clear;
+
+    static PyGetSetDef getset[] = {
+        {const_cast<char*>("__dict__"), pybind11_get_dict, pybind11_set_dict, nullptr, nullptr},
+        {nullptr, nullptr, nullptr, nullptr, nullptr}
+    };
+    type->tp_getset = getset;
+}
+
+/// buffer_protocol: Fill in the view as specified by flags.
+extern "C" inline int pybind11_getbuffer(PyObject *obj, Py_buffer *view, int flags) {
+    // Look for a `get_buffer` implementation in this type's info or any bases (following MRO).
+    type_info *tinfo = nullptr;
+    for (auto type : reinterpret_borrow<tuple>(Py_TYPE(obj)->tp_mro)) {
+        tinfo = get_type_info((PyTypeObject *) type.ptr());
+        if (tinfo && tinfo->get_buffer)
+            break;
+    }
+    if (view == nullptr || !tinfo || !tinfo->get_buffer) {
+        if (view)
+            view->obj = nullptr;
+        PyErr_SetString(PyExc_BufferError, "pybind11_getbuffer(): Internal error");
+        return -1;
+    }
+    std::memset(view, 0, sizeof(Py_buffer));
+    buffer_info *info = tinfo->get_buffer(obj, tinfo->get_buffer_data);
+    view->obj = obj;
+    view->ndim = 1;
+    view->internal = info;
+    view->buf = info->ptr;
+    view->itemsize = info->itemsize;
+    view->len = view->itemsize;
+    for (auto s : info->shape)
+        view->len *= s;
+    view->readonly = info->readonly;
+    if ((flags & PyBUF_WRITABLE) == PyBUF_WRITABLE && info->readonly) {
+        if (view)
+            view->obj = nullptr;
+        PyErr_SetString(PyExc_BufferError, "Writable buffer requested for readonly storage");
+        return -1;
+    }
+    if ((flags & PyBUF_FORMAT) == PyBUF_FORMAT)
+        view->format = const_cast<char *>(info->format.c_str());
+    if ((flags & PyBUF_STRIDES) == PyBUF_STRIDES) {
+        view->ndim = (int) info->ndim;
+        view->strides = &info->strides[0];
+        view->shape = &info->shape[0];
+    }
+    Py_INCREF(view->obj);
+    return 0;
+}
+
+/// buffer_protocol: Release the resources of the buffer.
+extern "C" inline void pybind11_releasebuffer(PyObject *, Py_buffer *view) {
+    delete (buffer_info *) view->internal;
+}
+
+/// Give this type a buffer interface.
+inline void enable_buffer_protocol(PyHeapTypeObject *heap_type) {
+    heap_type->ht_type.tp_as_buffer = &heap_type->as_buffer;
+#if PY_MAJOR_VERSION < 3
+    heap_type->ht_type.tp_flags |= Py_TPFLAGS_HAVE_NEWBUFFER;
+#endif
+
+    heap_type->as_buffer.bf_getbuffer = pybind11_getbuffer;
+    heap_type->as_buffer.bf_releasebuffer = pybind11_releasebuffer;
+}
+
+/** Create a brand new Python type according to the `type_record` specification.
+    Return value: New reference. */
+inline PyObject* make_new_python_type(const type_record &rec) {
+    auto name = reinterpret_steal<object>(PYBIND11_FROM_STRING(rec.name));
+
+    auto qualname = name;
+    if (rec.scope && !PyModule_Check(rec.scope.ptr()) && hasattr(rec.scope, "__qualname__")) {
+#if PY_MAJOR_VERSION >= 3
+        qualname = reinterpret_steal<object>(
+            PyUnicode_FromFormat("%U.%U", rec.scope.attr("__qualname__").ptr(), name.ptr()));
+#else
+        qualname = str(rec.scope.attr("__qualname__").cast<std::string>() + "." + rec.name);
+#endif
+    }
+
+    object module;
+    if (rec.scope) {
+        if (hasattr(rec.scope, "__module__"))
+            module = rec.scope.attr("__module__");
+        else if (hasattr(rec.scope, "__name__"))
+            module = rec.scope.attr("__name__");
+    }
+
+    auto full_name = c_str(
+#if !defined(PYPY_VERSION)
+        module ? str(module).cast<std::string>() + "." + rec.name :
+#endif
+        rec.name);
+
+    char *tp_doc = nullptr;
+    if (rec.doc && options::show_user_defined_docstrings()) {
+        /* Allocate memory for docstring (using PyObject_MALLOC, since
+           Python will free this later on) */
+        size_t size = strlen(rec.doc) + 1;
+        tp_doc = (char *) PyObject_MALLOC(size);
+        memcpy((void *) tp_doc, rec.doc, size);
+    }
+
+    auto &internals = get_internals();
+    auto bases = tuple(rec.bases);
+    auto base = (bases.size() == 0) ? internals.instance_base
+                                    : bases[0].ptr();
+
+    /* Danger zone: from now (and until PyType_Ready), make sure to
+       issue no Python C API calls which could potentially invoke the
+       garbage collector (the GC will call type_traverse(), which will in
+       turn find the newly constructed type in an invalid state) */
+    auto metaclass = rec.metaclass.ptr() ? (PyTypeObject *) rec.metaclass.ptr()
+                                         : internals.default_metaclass;
+
+    auto heap_type = (PyHeapTypeObject *) metaclass->tp_alloc(metaclass, 0);
+    if (!heap_type)
+        pybind11_fail(std::string(rec.name) + ": Unable to create type object!");
+
+    heap_type->ht_name = name.release().ptr();
+#ifdef PYBIND11_BUILTIN_QUALNAME
+    heap_type->ht_qualname = qualname.inc_ref().ptr();
+#endif
+
+    auto type = &heap_type->ht_type;
+    type->tp_name = full_name;
+    type->tp_doc = tp_doc;
+    type->tp_base = type_incref((PyTypeObject *)base);
+    type->tp_basicsize = static_cast<ssize_t>(sizeof(instance));
+    if (bases.size() > 0)
+        type->tp_bases = bases.release().ptr();
+
+    /* Don't inherit base __init__ */
+    type->tp_init = pybind11_object_init;
+
+    /* Supported protocols */
+    type->tp_as_number = &heap_type->as_number;
+    type->tp_as_sequence = &heap_type->as_sequence;
+    type->tp_as_mapping = &heap_type->as_mapping;
+#if PY_VERSION_HEX >= 0x03050000
+    type->tp_as_async = &heap_type->as_async;
+#endif
+
+    /* Flags */
+    type->tp_flags |= Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE;
+#if PY_MAJOR_VERSION < 3
+    type->tp_flags |= Py_TPFLAGS_CHECKTYPES;
+#endif
+
+    if (rec.dynamic_attr)
+        enable_dynamic_attributes(heap_type);
+
+    if (rec.buffer_protocol)
+        enable_buffer_protocol(heap_type);
+
+    if (PyType_Ready(type) < 0)
+        pybind11_fail(std::string(rec.name) + ": PyType_Ready failed (" + error_string() + ")!");
+
+    assert(rec.dynamic_attr ? PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC)
+                            : !PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC));
+
+    /* Register type with the parent scope */
+    if (rec.scope)
+        setattr(rec.scope, rec.name, (PyObject *) type);
+    else
+        Py_INCREF(type); // Keep it alive forever (reference leak)
+
+    if (module) // Needed by pydoc
+        setattr((PyObject *) type, "__module__", module);
+
+    PYBIND11_SET_OLDPY_QUALNAME(type, qualname);
+
+    return (PyObject *) type;
+}
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/detail/common.h b/3rdparty/pybind11/include/pybind11/detail/common.h
new file mode 100644
index 00000000..e53f502d
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/detail/common.h
@@ -0,0 +1,820 @@
+/*
+    pybind11/detail/common.h -- Basic macros
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#if !defined(NAMESPACE_BEGIN)
+#  define NAMESPACE_BEGIN(name) namespace name {
+#endif
+#if !defined(NAMESPACE_END)
+#  define NAMESPACE_END(name) }
+#endif
+
+// Robust support for some features and loading modules compiled against different pybind versions
+// requires forcing hidden visibility on pybind code, so we enforce this by setting the attribute on
+// the main `pybind11` namespace.
+#if !defined(PYBIND11_NAMESPACE)
+#  ifdef __GNUG__
+#    define PYBIND11_NAMESPACE pybind11 __attribute__((visibility("hidden")))
+#  else
+#    define PYBIND11_NAMESPACE pybind11
+#  endif
+#endif
+
+#if !(defined(_MSC_VER) && __cplusplus == 199711L) && !defined(__INTEL_COMPILER)
+#  if __cplusplus >= 201402L
+#    define PYBIND11_CPP14
+#    if __cplusplus >= 201703L
+#      define PYBIND11_CPP17
+#    endif
+#  endif
+#elif defined(_MSC_VER) && __cplusplus == 199711L
+// MSVC sets _MSVC_LANG rather than __cplusplus (supposedly until the standard is fully implemented)
+// Unless you use the /Zc:__cplusplus flag on Visual Studio 2017 15.7 Preview 3 or newer
+#  if _MSVC_LANG >= 201402L
+#    define PYBIND11_CPP14
+#    if _MSVC_LANG > 201402L && _MSC_VER >= 1910
+#      define PYBIND11_CPP17
+#    endif
+#  endif
+#endif
+
+// Compiler version assertions
+#if defined(__INTEL_COMPILER)
+#  if __INTEL_COMPILER < 1700
+#    error pybind11 requires Intel C++ compiler v17 or newer
+#  endif
+#elif defined(__clang__) && !defined(__apple_build_version__)
+#  if __clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ < 3)
+#    error pybind11 requires clang 3.3 or newer
+#  endif
+#elif defined(__clang__)
+// Apple changes clang version macros to its Xcode version; the first Xcode release based on
+// (upstream) clang 3.3 was Xcode 5:
+#  if __clang_major__ < 5
+#    error pybind11 requires Xcode/clang 5.0 or newer
+#  endif
+#elif defined(__GNUG__)
+#  if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
+#    error pybind11 requires gcc 4.8 or newer
+#  endif
+#elif defined(_MSC_VER)
+// Pybind hits various compiler bugs in 2015u2 and earlier, and also makes use of some stl features
+// (e.g. std::negation) added in 2015u3:
+#  if _MSC_FULL_VER < 190024210
+#    error pybind11 requires MSVC 2015 update 3 or newer
+#  endif
+#endif
+
+#if !defined(PYBIND11_EXPORT)
+#  if defined(WIN32) || defined(_WIN32)
+#    define PYBIND11_EXPORT __declspec(dllexport)
+#  else
+#    define PYBIND11_EXPORT __attribute__ ((visibility("default")))
+#  endif
+#endif
+
+#if defined(_MSC_VER)
+#  define PYBIND11_NOINLINE __declspec(noinline)
+#else
+#  define PYBIND11_NOINLINE __attribute__ ((noinline))
+#endif
+
+#if defined(PYBIND11_CPP14)
+#  define PYBIND11_DEPRECATED(reason) [[deprecated(reason)]]
+#else
+#  define PYBIND11_DEPRECATED(reason) __attribute__((deprecated(reason)))
+#endif
+
+#define PYBIND11_VERSION_MAJOR 2
+#define PYBIND11_VERSION_MINOR 5
+#define PYBIND11_VERSION_PATCH 0
+
+/// Include Python header, disable linking to pythonX_d.lib on Windows in debug mode
+#if defined(_MSC_VER)
+#  if (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 4)
+#    define HAVE_ROUND 1
+#  endif
+#  pragma warning(push)
+#  pragma warning(disable: 4510 4610 4512 4005)
+#  if defined(_DEBUG) && !defined(Py_DEBUG)
+#    define PYBIND11_DEBUG_MARKER
+#    undef _DEBUG
+#  endif
+#endif
+
+#include <Python.h>
+#include <frameobject.h>
+#include <pythread.h>
+
+/* Python #defines overrides on all sorts of core functions, which
+   tends to weak havok in C++ codebases that expect these to work
+   like regular functions (potentially with several overloads) */
+#if defined(isalnum)
+#  undef isalnum
+#  undef isalpha
+#  undef islower
+#  undef isspace
+#  undef isupper
+#  undef tolower
+#  undef toupper
+#endif
+
+#if defined(copysign)
+#  undef copysign
+#endif
+
+#if defined(_MSC_VER)
+#  if defined(PYBIND11_DEBUG_MARKER)
+#    define _DEBUG
+#    undef PYBIND11_DEBUG_MARKER
+#  endif
+#  pragma warning(pop)
+#endif
+
+#include <cstddef>
+#include <cstring>
+#include <forward_list>
+#include <vector>
+#include <string>
+#include <stdexcept>
+#include <unordered_set>
+#include <unordered_map>
+#include <memory>
+#include <typeindex>
+#include <type_traits>
+
+#if PY_MAJOR_VERSION >= 3 /// Compatibility macros for various Python versions
+#define PYBIND11_INSTANCE_METHOD_NEW(ptr, class_) PyInstanceMethod_New(ptr)
+#define PYBIND11_INSTANCE_METHOD_CHECK PyInstanceMethod_Check
+#define PYBIND11_INSTANCE_METHOD_GET_FUNCTION PyInstanceMethod_GET_FUNCTION
+#define PYBIND11_BYTES_CHECK PyBytes_Check
+#define PYBIND11_BYTES_FROM_STRING PyBytes_FromString
+#define PYBIND11_BYTES_FROM_STRING_AND_SIZE PyBytes_FromStringAndSize
+#define PYBIND11_BYTES_AS_STRING_AND_SIZE PyBytes_AsStringAndSize
+#define PYBIND11_BYTES_AS_STRING PyBytes_AsString
+#define PYBIND11_BYTES_SIZE PyBytes_Size
+#define PYBIND11_LONG_CHECK(o) PyLong_Check(o)
+#define PYBIND11_LONG_AS_LONGLONG(o) PyLong_AsLongLong(o)
+#define PYBIND11_LONG_FROM_SIGNED(o) PyLong_FromSsize_t((ssize_t) o)
+#define PYBIND11_LONG_FROM_UNSIGNED(o) PyLong_FromSize_t((size_t) o)
+#define PYBIND11_BYTES_NAME "bytes"
+#define PYBIND11_STRING_NAME "str"
+#define PYBIND11_SLICE_OBJECT PyObject
+#define PYBIND11_FROM_STRING PyUnicode_FromString
+#define PYBIND11_STR_TYPE ::pybind11::str
+#define PYBIND11_BOOL_ATTR "__bool__"
+#define PYBIND11_NB_BOOL(ptr) ((ptr)->nb_bool)
+// Providing a separate declaration to make Clang's -Wmissing-prototypes happy
+#define PYBIND11_PLUGIN_IMPL(name) \
+    extern "C" PYBIND11_EXPORT PyObject *PyInit_##name();   \
+    extern "C" PYBIND11_EXPORT PyObject *PyInit_##name()
+
+#else
+#define PYBIND11_INSTANCE_METHOD_NEW(ptr, class_) PyMethod_New(ptr, nullptr, class_)
+#define PYBIND11_INSTANCE_METHOD_CHECK PyMethod_Check
+#define PYBIND11_INSTANCE_METHOD_GET_FUNCTION PyMethod_GET_FUNCTION
+#define PYBIND11_BYTES_CHECK PyString_Check
+#define PYBIND11_BYTES_FROM_STRING PyString_FromString
+#define PYBIND11_BYTES_FROM_STRING_AND_SIZE PyString_FromStringAndSize
+#define PYBIND11_BYTES_AS_STRING_AND_SIZE PyString_AsStringAndSize
+#define PYBIND11_BYTES_AS_STRING PyString_AsString
+#define PYBIND11_BYTES_SIZE PyString_Size
+#define PYBIND11_LONG_CHECK(o) (PyInt_Check(o) || PyLong_Check(o))
+#define PYBIND11_LONG_AS_LONGLONG(o) (PyInt_Check(o) ? (long long) PyLong_AsLong(o) : PyLong_AsLongLong(o))
+#define PYBIND11_LONG_FROM_SIGNED(o) PyInt_FromSsize_t((ssize_t) o) // Returns long if needed.
+#define PYBIND11_LONG_FROM_UNSIGNED(o) PyInt_FromSize_t((size_t) o) // Returns long if needed.
+#define PYBIND11_BYTES_NAME "str"
+#define PYBIND11_STRING_NAME "unicode"
+#define PYBIND11_SLICE_OBJECT PySliceObject
+#define PYBIND11_FROM_STRING PyString_FromString
+#define PYBIND11_STR_TYPE ::pybind11::bytes
+#define PYBIND11_BOOL_ATTR "__nonzero__"
+#define PYBIND11_NB_BOOL(ptr) ((ptr)->nb_nonzero)
+// Providing a separate PyInit decl to make Clang's -Wmissing-prototypes happy
+#define PYBIND11_PLUGIN_IMPL(name) \
+    static PyObject *pybind11_init_wrapper();               \
+    extern "C" PYBIND11_EXPORT void init##name();           \
+    extern "C" PYBIND11_EXPORT void init##name() {          \
+        (void)pybind11_init_wrapper();                      \
+    }                                                       \
+    PyObject *pybind11_init_wrapper()
+#endif
+
+#if PY_VERSION_HEX >= 0x03050000 && PY_VERSION_HEX < 0x03050200
+extern "C" {
+    struct _Py_atomic_address { void *value; };
+    PyAPI_DATA(_Py_atomic_address) _PyThreadState_Current;
+}
+#endif
+
+#define PYBIND11_TRY_NEXT_OVERLOAD ((PyObject *) 1) // special failure return code
+#define PYBIND11_STRINGIFY(x) #x
+#define PYBIND11_TOSTRING(x) PYBIND11_STRINGIFY(x)
+#define PYBIND11_CONCAT(first, second) first##second
+#define PYBIND11_ENSURE_INTERNALS_READY \
+    pybind11::detail::get_internals();
+
+#define PYBIND11_CHECK_PYTHON_VERSION \
+    {                                                                          \
+        const char *compiled_ver = PYBIND11_TOSTRING(PY_MAJOR_VERSION)         \
+            "." PYBIND11_TOSTRING(PY_MINOR_VERSION);                           \
+        const char *runtime_ver = Py_GetVersion();                             \
+        size_t len = std::strlen(compiled_ver);                                \
+        if (std::strncmp(runtime_ver, compiled_ver, len) != 0                  \
+                || (runtime_ver[len] >= '0' && runtime_ver[len] <= '9')) {     \
+            PyErr_Format(PyExc_ImportError,                                    \
+                "Python version mismatch: module was compiled for Python %s, " \
+                "but the interpreter version is incompatible: %s.",            \
+                compiled_ver, runtime_ver);                                    \
+            return nullptr;                                                    \
+        }                                                                      \
+    }
+
+#define PYBIND11_CATCH_INIT_EXCEPTIONS \
+        catch (pybind11::error_already_set &e) {                               \
+            PyErr_SetString(PyExc_ImportError, e.what());                      \
+            return nullptr;                                                    \
+        } catch (const std::exception &e) {                                    \
+            PyErr_SetString(PyExc_ImportError, e.what());                      \
+            return nullptr;                                                    \
+        }                                                                      \
+
+/** \rst
+    ***Deprecated in favor of PYBIND11_MODULE***
+
+    This macro creates the entry point that will be invoked when the Python interpreter
+    imports a plugin library. Please create a `module` in the function body and return
+    the pointer to its underlying Python object at the end.
+
+    .. code-block:: cpp
+
+        PYBIND11_PLUGIN(example) {
+            pybind11::module m("example", "pybind11 example plugin");
+            /// Set up bindings here
+            return m.ptr();
+        }
+\endrst */
+#define PYBIND11_PLUGIN(name)                                                  \
+    PYBIND11_DEPRECATED("PYBIND11_PLUGIN is deprecated, use PYBIND11_MODULE")  \
+    static PyObject *pybind11_init();                                          \
+    PYBIND11_PLUGIN_IMPL(name) {                                               \
+        PYBIND11_CHECK_PYTHON_VERSION                                          \
+        PYBIND11_ENSURE_INTERNALS_READY                                        \
+        try {                                                                  \
+            return pybind11_init();                                            \
+        } PYBIND11_CATCH_INIT_EXCEPTIONS                                       \
+    }                                                                          \
+    PyObject *pybind11_init()
+
+/** \rst
+    This macro creates the entry point that will be invoked when the Python interpreter
+    imports an extension module. The module name is given as the fist argument and it
+    should not be in quotes. The second macro argument defines a variable of type
+    `py::module` which can be used to initialize the module.
+
+    .. code-block:: cpp
+
+        PYBIND11_MODULE(example, m) {
+            m.doc() = "pybind11 example module";
+
+            // Add bindings here
+            m.def("foo", []() {
+                return "Hello, World!";
+            });
+        }
+\endrst */
+#define PYBIND11_MODULE(name, variable)                                        \
+    static void PYBIND11_CONCAT(pybind11_init_, name)(pybind11::module &);     \
+    PYBIND11_PLUGIN_IMPL(name) {                                               \
+        PYBIND11_CHECK_PYTHON_VERSION                                          \
+        PYBIND11_ENSURE_INTERNALS_READY                                        \
+        auto m = pybind11::module(PYBIND11_TOSTRING(name));                    \
+        try {                                                                  \
+            PYBIND11_CONCAT(pybind11_init_, name)(m);                          \
+            return m.ptr();                                                    \
+        } PYBIND11_CATCH_INIT_EXCEPTIONS                                       \
+    }                                                                          \
+    void PYBIND11_CONCAT(pybind11_init_, name)(pybind11::module &variable)
+
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+using ssize_t = Py_ssize_t;
+using size_t  = std::size_t;
+
+/// Approach used to cast a previously unknown C++ instance into a Python object
+enum class return_value_policy : uint8_t {
+    /** This is the default return value policy, which falls back to the policy
+        return_value_policy::take_ownership when the return value is a pointer.
+        Otherwise, it uses return_value::move or return_value::copy for rvalue
+        and lvalue references, respectively. See below for a description of what
+        all of these different policies do. */
+    automatic = 0,
+
+    /** As above, but use policy return_value_policy::reference when the return
+        value is a pointer. This is the default conversion policy for function
+        arguments when calling Python functions manually from C++ code (i.e. via
+        handle::operator()). You probably won't need to use this. */
+    automatic_reference,
+
+    /** Reference an existing object (i.e. do not create a new copy) and take
+        ownership. Python will call the destructor and delete operator when the
+        object’s reference count reaches zero. Undefined behavior ensues when
+        the C++ side does the same.. */
+    take_ownership,
+
+    /** Create a new copy of the returned object, which will be owned by
+        Python. This policy is comparably safe because the lifetimes of the two
+        instances are decoupled. */
+    copy,
+
+    /** Use std::move to move the return value contents into a new instance
+        that will be owned by Python. This policy is comparably safe because the
+        lifetimes of the two instances (move source and destination) are
+        decoupled. */
+    move,
+
+    /** Reference an existing object, but do not take ownership. The C++ side
+        is responsible for managing the object’s lifetime and deallocating it
+        when it is no longer used. Warning: undefined behavior will ensue when
+        the C++ side deletes an object that is still referenced and used by
+        Python. */
+    reference,
+
+    /** This policy only applies to methods and properties. It references the
+        object without taking ownership similar to the above
+        return_value_policy::reference policy. In contrast to that policy, the
+        function or property’s implicit this argument (called the parent) is
+        considered to be the the owner of the return value (the child).
+        pybind11 then couples the lifetime of the parent to the child via a
+        reference relationship that ensures that the parent cannot be garbage
+        collected while Python is still using the child. More advanced
+        variations of this scheme are also possible using combinations of
+        return_value_policy::reference and the keep_alive call policy */
+    reference_internal
+};
+
+NAMESPACE_BEGIN(detail)
+
+inline static constexpr int log2(size_t n, int k = 0) { return (n <= 1) ? k : log2(n >> 1, k + 1); }
+
+// Returns the size as a multiple of sizeof(void *), rounded up.
+inline static constexpr size_t size_in_ptrs(size_t s) { return 1 + ((s - 1) >> log2(sizeof(void *))); }
+
+/**
+ * The space to allocate for simple layout instance holders (see below) in multiple of the size of
+ * a pointer (e.g.  2 means 16 bytes on 64-bit architectures).  The default is the minimum required
+ * to holder either a std::unique_ptr or std::shared_ptr (which is almost always
+ * sizeof(std::shared_ptr<T>)).
+ */
+constexpr size_t instance_simple_holder_in_ptrs() {
+    static_assert(sizeof(std::shared_ptr<int>) >= sizeof(std::unique_ptr<int>),
+            "pybind assumes std::shared_ptrs are at least as big as std::unique_ptrs");
+    return size_in_ptrs(sizeof(std::shared_ptr<int>));
+}
+
+// Forward declarations
+struct type_info;
+struct value_and_holder;
+
+struct nonsimple_values_and_holders {
+    void **values_and_holders;
+    uint8_t *status;
+};
+
+/// The 'instance' type which needs to be standard layout (need to be able to use 'offsetof')
+struct instance {
+    PyObject_HEAD
+    /// Storage for pointers and holder; see simple_layout, below, for a description
+    union {
+        void *simple_value_holder[1 + instance_simple_holder_in_ptrs()];
+        nonsimple_values_and_holders nonsimple;
+    };
+    /// Weak references
+    PyObject *weakrefs;
+    /// If true, the pointer is owned which means we're free to manage it with a holder.
+    bool owned : 1;
+    /**
+     * An instance has two possible value/holder layouts.
+     *
+     * Simple layout (when this flag is true), means the `simple_value_holder` is set with a pointer
+     * and the holder object governing that pointer, i.e. [val1*][holder].  This layout is applied
+     * whenever there is no python-side multiple inheritance of bound C++ types *and* the type's
+     * holder will fit in the default space (which is large enough to hold either a std::unique_ptr
+     * or std::shared_ptr).
+     *
+     * Non-simple layout applies when using custom holders that require more space than `shared_ptr`
+     * (which is typically the size of two pointers), or when multiple inheritance is used on the
+     * python side.  Non-simple layout allocates the required amount of memory to have multiple
+     * bound C++ classes as parents.  Under this layout, `nonsimple.values_and_holders` is set to a
+     * pointer to allocated space of the required space to hold a sequence of value pointers and
+     * holders followed `status`, a set of bit flags (1 byte each), i.e.
+     * [val1*][holder1][val2*][holder2]...[bb...]  where each [block] is rounded up to a multiple of
+     * `sizeof(void *)`.  `nonsimple.status` is, for convenience, a pointer to the
+     * beginning of the [bb...] block (but not independently allocated).
+     *
+     * Status bits indicate whether the associated holder is constructed (&
+     * status_holder_constructed) and whether the value pointer is registered (&
+     * status_instance_registered) in `registered_instances`.
+     */
+    bool simple_layout : 1;
+    /// For simple layout, tracks whether the holder has been constructed
+    bool simple_holder_constructed : 1;
+    /// For simple layout, tracks whether the instance is registered in `registered_instances`
+    bool simple_instance_registered : 1;
+    /// If true, get_internals().patients has an entry for this object
+    bool has_patients : 1;
+
+    /// Initializes all of the above type/values/holders data (but not the instance values themselves)
+    void allocate_layout();
+
+    /// Destroys/deallocates all of the above
+    void deallocate_layout();
+
+    /// Returns the value_and_holder wrapper for the given type (or the first, if `find_type`
+    /// omitted).  Returns a default-constructed (with `.inst = nullptr`) object on failure if
+    /// `throw_if_missing` is false.
+    value_and_holder get_value_and_holder(const type_info *find_type = nullptr, bool throw_if_missing = true);
+
+    /// Bit values for the non-simple status flags
+    static constexpr uint8_t status_holder_constructed  = 1;
+    static constexpr uint8_t status_instance_registered = 2;
+};
+
+static_assert(std::is_standard_layout<instance>::value, "Internal error: `pybind11::detail::instance` is not standard layout!");
+
+/// from __cpp_future__ import (convenient aliases from C++14/17)
+#if defined(PYBIND11_CPP14) && (!defined(_MSC_VER) || _MSC_VER >= 1910)
+using std::enable_if_t;
+using std::conditional_t;
+using std::remove_cv_t;
+using std::remove_reference_t;
+#else
+template <bool B, typename T = void> using enable_if_t = typename std::enable_if<B, T>::type;
+template <bool B, typename T, typename F> using conditional_t = typename std::conditional<B, T, F>::type;
+template <typename T> using remove_cv_t = typename std::remove_cv<T>::type;
+template <typename T> using remove_reference_t = typename std::remove_reference<T>::type;
+#endif
+
+/// Index sequences
+#if defined(PYBIND11_CPP14)
+using std::index_sequence;
+using std::make_index_sequence;
+#else
+template<size_t ...> struct index_sequence  { };
+template<size_t N, size_t ...S> struct make_index_sequence_impl : make_index_sequence_impl <N - 1, N - 1, S...> { };
+template<size_t ...S> struct make_index_sequence_impl <0, S...> { typedef index_sequence<S...> type; };
+template<size_t N> using make_index_sequence = typename make_index_sequence_impl<N>::type;
+#endif
+
+/// Make an index sequence of the indices of true arguments
+template <typename ISeq, size_t, bool...> struct select_indices_impl { using type = ISeq; };
+template <size_t... IPrev, size_t I, bool B, bool... Bs> struct select_indices_impl<index_sequence<IPrev...>, I, B, Bs...>
+    : select_indices_impl<conditional_t<B, index_sequence<IPrev..., I>, index_sequence<IPrev...>>, I + 1, Bs...> {};
+template <bool... Bs> using select_indices = typename select_indices_impl<index_sequence<>, 0, Bs...>::type;
+
+/// Backports of std::bool_constant and std::negation to accommodate older compilers
+template <bool B> using bool_constant = std::integral_constant<bool, B>;
+template <typename T> struct negation : bool_constant<!T::value> { };
+
+template <typename...> struct void_t_impl { using type = void; };
+template <typename... Ts> using void_t = typename void_t_impl<Ts...>::type;
+
+/// Compile-time all/any/none of that check the boolean value of all template types
+#if defined(__cpp_fold_expressions) && !(defined(_MSC_VER) && (_MSC_VER < 1916))
+template <class... Ts> using all_of = bool_constant<(Ts::value && ...)>;
+template <class... Ts> using any_of = bool_constant<(Ts::value || ...)>;
+#elif !defined(_MSC_VER)
+template <bool...> struct bools {};
+template <class... Ts> using all_of = std::is_same<
+    bools<Ts::value..., true>,
+    bools<true, Ts::value...>>;
+template <class... Ts> using any_of = negation<all_of<negation<Ts>...>>;
+#else
+// MSVC has trouble with the above, but supports std::conjunction, which we can use instead (albeit
+// at a slight loss of compilation efficiency).
+template <class... Ts> using all_of = std::conjunction<Ts...>;
+template <class... Ts> using any_of = std::disjunction<Ts...>;
+#endif
+template <class... Ts> using none_of = negation<any_of<Ts...>>;
+
+template <class T, template<class> class... Predicates> using satisfies_all_of = all_of<Predicates<T>...>;
+template <class T, template<class> class... Predicates> using satisfies_any_of = any_of<Predicates<T>...>;
+template <class T, template<class> class... Predicates> using satisfies_none_of = none_of<Predicates<T>...>;
+
+/// Strip the class from a method type
+template <typename T> struct remove_class { };
+template <typename C, typename R, typename... A> struct remove_class<R (C::*)(A...)> { typedef R type(A...); };
+template <typename C, typename R, typename... A> struct remove_class<R (C::*)(A...) const> { typedef R type(A...); };
+
+/// Helper template to strip away type modifiers
+template <typename T> struct intrinsic_type                       { typedef T type; };
+template <typename T> struct intrinsic_type<const T>              { typedef typename intrinsic_type<T>::type type; };
+template <typename T> struct intrinsic_type<T*>                   { typedef typename intrinsic_type<T>::type type; };
+template <typename T> struct intrinsic_type<T&>                   { typedef typename intrinsic_type<T>::type type; };
+template <typename T> struct intrinsic_type<T&&>                  { typedef typename intrinsic_type<T>::type type; };
+template <typename T, size_t N> struct intrinsic_type<const T[N]> { typedef typename intrinsic_type<T>::type type; };
+template <typename T, size_t N> struct intrinsic_type<T[N]>       { typedef typename intrinsic_type<T>::type type; };
+template <typename T> using intrinsic_t = typename intrinsic_type<T>::type;
+
+/// Helper type to replace 'void' in some expressions
+struct void_type { };
+
+/// Helper template which holds a list of types
+template <typename...> struct type_list { };
+
+/// Compile-time integer sum
+#ifdef __cpp_fold_expressions
+template <typename... Ts> constexpr size_t constexpr_sum(Ts... ns) { return (0 + ... + size_t{ns}); }
+#else
+constexpr size_t constexpr_sum() { return 0; }
+template <typename T, typename... Ts>
+constexpr size_t constexpr_sum(T n, Ts... ns) { return size_t{n} + constexpr_sum(ns...); }
+#endif
+
+NAMESPACE_BEGIN(constexpr_impl)
+/// Implementation details for constexpr functions
+constexpr int first(int i) { return i; }
+template <typename T, typename... Ts>
+constexpr int first(int i, T v, Ts... vs) { return v ? i : first(i + 1, vs...); }
+
+constexpr int last(int /*i*/, int result) { return result; }
+template <typename T, typename... Ts>
+constexpr int last(int i, int result, T v, Ts... vs) { return last(i + 1, v ? i : result, vs...); }
+NAMESPACE_END(constexpr_impl)
+
+/// Return the index of the first type in Ts which satisfies Predicate<T>.  Returns sizeof...(Ts) if
+/// none match.
+template <template<typename> class Predicate, typename... Ts>
+constexpr int constexpr_first() { return constexpr_impl::first(0, Predicate<Ts>::value...); }
+
+/// Return the index of the last type in Ts which satisfies Predicate<T>, or -1 if none match.
+template <template<typename> class Predicate, typename... Ts>
+constexpr int constexpr_last() { return constexpr_impl::last(0, -1, Predicate<Ts>::value...); }
+
+/// Return the Nth element from the parameter pack
+template <size_t N, typename T, typename... Ts>
+struct pack_element { using type = typename pack_element<N - 1, Ts...>::type; };
+template <typename T, typename... Ts>
+struct pack_element<0, T, Ts...> { using type = T; };
+
+/// Return the one and only type which matches the predicate, or Default if none match.
+/// If more than one type matches the predicate, fail at compile-time.
+template <template<typename> class Predicate, typename Default, typename... Ts>
+struct exactly_one {
+    static constexpr auto found = constexpr_sum(Predicate<Ts>::value...);
+    static_assert(found <= 1, "Found more than one type matching the predicate");
+
+    static constexpr auto index = found ? constexpr_first<Predicate, Ts...>() : 0;
+    using type = conditional_t<found, typename pack_element<index, Ts...>::type, Default>;
+};
+template <template<typename> class P, typename Default>
+struct exactly_one<P, Default> { using type = Default; };
+
+template <template<typename> class Predicate, typename Default, typename... Ts>
+using exactly_one_t = typename exactly_one<Predicate, Default, Ts...>::type;
+
+/// Defer the evaluation of type T until types Us are instantiated
+template <typename T, typename... /*Us*/> struct deferred_type { using type = T; };
+template <typename T, typename... Us> using deferred_t = typename deferred_type<T, Us...>::type;
+
+/// Like is_base_of, but requires a strict base (i.e. `is_strict_base_of<T, T>::value == false`,
+/// unlike `std::is_base_of`)
+template <typename Base, typename Derived> using is_strict_base_of = bool_constant<
+    std::is_base_of<Base, Derived>::value && !std::is_same<Base, Derived>::value>;
+
+/// Like is_base_of, but also requires that the base type is accessible (i.e. that a Derived pointer
+/// can be converted to a Base pointer)
+template <typename Base, typename Derived> using is_accessible_base_of = bool_constant<
+    std::is_base_of<Base, Derived>::value && std::is_convertible<Derived *, Base *>::value>;
+
+template <template<typename...> class Base>
+struct is_template_base_of_impl {
+    template <typename... Us> static std::true_type check(Base<Us...> *);
+    static std::false_type check(...);
+};
+
+/// Check if a template is the base of a type. For example:
+/// `is_template_base_of<Base, T>` is true if `struct T : Base<U> {}` where U can be anything
+template <template<typename...> class Base, typename T>
+#if !defined(_MSC_VER)
+using is_template_base_of = decltype(is_template_base_of_impl<Base>::check((intrinsic_t<T>*)nullptr));
+#else // MSVC2015 has trouble with decltype in template aliases
+struct is_template_base_of : decltype(is_template_base_of_impl<Base>::check((intrinsic_t<T>*)nullptr)) { };
+#endif
+
+/// Check if T is an instantiation of the template `Class`. For example:
+/// `is_instantiation<shared_ptr, T>` is true if `T == shared_ptr<U>` where U can be anything.
+template <template<typename...> class Class, typename T>
+struct is_instantiation : std::false_type { };
+template <template<typename...> class Class, typename... Us>
+struct is_instantiation<Class, Class<Us...>> : std::true_type { };
+
+/// Check if T is std::shared_ptr<U> where U can be anything
+template <typename T> using is_shared_ptr = is_instantiation<std::shared_ptr, T>;
+
+/// Check if T looks like an input iterator
+template <typename T, typename = void> struct is_input_iterator : std::false_type {};
+template <typename T>
+struct is_input_iterator<T, void_t<decltype(*std::declval<T &>()), decltype(++std::declval<T &>())>>
+    : std::true_type {};
+
+template <typename T> using is_function_pointer = bool_constant<
+    std::is_pointer<T>::value && std::is_function<typename std::remove_pointer<T>::type>::value>;
+
+template <typename F> struct strip_function_object {
+    using type = typename remove_class<decltype(&F::operator())>::type;
+};
+
+// Extracts the function signature from a function, function pointer or lambda.
+template <typename Function, typename F = remove_reference_t<Function>>
+using function_signature_t = conditional_t<
+    std::is_function<F>::value,
+    F,
+    typename conditional_t<
+        std::is_pointer<F>::value || std::is_member_pointer<F>::value,
+        std::remove_pointer<F>,
+        strip_function_object<F>
+    >::type
+>;
+
+/// Returns true if the type looks like a lambda: that is, isn't a function, pointer or member
+/// pointer.  Note that this can catch all sorts of other things, too; this is intended to be used
+/// in a place where passing a lambda makes sense.
+template <typename T> using is_lambda = satisfies_none_of<remove_reference_t<T>,
+        std::is_function, std::is_pointer, std::is_member_pointer>;
+
+/// Ignore that a variable is unused in compiler warnings
+inline void ignore_unused(const int *) { }
+
+/// Apply a function over each element of a parameter pack
+#ifdef __cpp_fold_expressions
+#define PYBIND11_EXPAND_SIDE_EFFECTS(PATTERN) (((PATTERN), void()), ...)
+#else
+using expand_side_effects = bool[];
+#define PYBIND11_EXPAND_SIDE_EFFECTS(PATTERN) pybind11::detail::expand_side_effects{ ((PATTERN), void(), false)..., false }
+#endif
+
+NAMESPACE_END(detail)
+
+/// C++ bindings of builtin Python exceptions
+class builtin_exception : public std::runtime_error {
+public:
+    using std::runtime_error::runtime_error;
+    /// Set the error using the Python C API
+    virtual void set_error() const = 0;
+};
+
+#define PYBIND11_RUNTIME_EXCEPTION(name, type) \
+    class name : public builtin_exception { public: \
+        using builtin_exception::builtin_exception; \
+        name() : name("") { } \
+        void set_error() const override { PyErr_SetString(type, what()); } \
+    };
+
+PYBIND11_RUNTIME_EXCEPTION(stop_iteration, PyExc_StopIteration)
+PYBIND11_RUNTIME_EXCEPTION(index_error, PyExc_IndexError)
+PYBIND11_RUNTIME_EXCEPTION(key_error, PyExc_KeyError)
+PYBIND11_RUNTIME_EXCEPTION(value_error, PyExc_ValueError)
+PYBIND11_RUNTIME_EXCEPTION(type_error, PyExc_TypeError)
+PYBIND11_RUNTIME_EXCEPTION(buffer_error, PyExc_BufferError)
+PYBIND11_RUNTIME_EXCEPTION(import_error, PyExc_ImportError)
+PYBIND11_RUNTIME_EXCEPTION(cast_error, PyExc_RuntimeError) /// Thrown when pybind11::cast or handle::call fail due to a type casting error
+PYBIND11_RUNTIME_EXCEPTION(reference_cast_error, PyExc_RuntimeError) /// Used internally
+
+[[noreturn]] PYBIND11_NOINLINE inline void pybind11_fail(const char *reason) { throw std::runtime_error(reason); }
+[[noreturn]] PYBIND11_NOINLINE inline void pybind11_fail(const std::string &reason) { throw std::runtime_error(reason); }
+
+template <typename T, typename SFINAE = void> struct format_descriptor { };
+
+NAMESPACE_BEGIN(detail)
+// Returns the index of the given type in the type char array below, and in the list in numpy.h
+// The order here is: bool; 8 ints ((signed,unsigned)x(8,16,32,64)bits); float,double,long double;
+// complex float,double,long double.  Note that the long double types only participate when long
+// double is actually longer than double (it isn't under MSVC).
+// NB: not only the string below but also complex.h and numpy.h rely on this order.
+template <typename T, typename SFINAE = void> struct is_fmt_numeric { static constexpr bool value = false; };
+template <typename T> struct is_fmt_numeric<T, enable_if_t<std::is_arithmetic<T>::value>> {
+    static constexpr bool value = true;
+    static constexpr int index = std::is_same<T, bool>::value ? 0 : 1 + (
+        std::is_integral<T>::value ? detail::log2(sizeof(T))*2 + std::is_unsigned<T>::value : 8 + (
+        std::is_same<T, double>::value ? 1 : std::is_same<T, long double>::value ? 2 : 0));
+};
+NAMESPACE_END(detail)
+
+template <typename T> struct format_descriptor<T, detail::enable_if_t<std::is_arithmetic<T>::value>> {
+    static constexpr const char c = "?bBhHiIqQfdg"[detail::is_fmt_numeric<T>::index];
+    static constexpr const char value[2] = { c, '\0' };
+    static std::string format() { return std::string(1, c); }
+};
+
+#if !defined(PYBIND11_CPP17)
+
+template <typename T> constexpr const char format_descriptor<
+    T, detail::enable_if_t<std::is_arithmetic<T>::value>>::value[2];
+
+#endif
+
+/// RAII wrapper that temporarily clears any Python error state
+struct error_scope {
+    PyObject *type, *value, *trace;
+    error_scope() { PyErr_Fetch(&type, &value, &trace); }
+    ~error_scope() { PyErr_Restore(type, value, trace); }
+};
+
+/// Dummy destructor wrapper that can be used to expose classes with a private destructor
+struct nodelete { template <typename T> void operator()(T*) { } };
+
+NAMESPACE_BEGIN(detail)
+template <typename... Args>
+struct overload_cast_impl {
+    constexpr overload_cast_impl() {} // MSVC 2015 needs this
+
+    template <typename Return>
+    constexpr auto operator()(Return (*pf)(Args...)) const noexcept
+                              -> decltype(pf) { return pf; }
+
+    template <typename Return, typename Class>
+    constexpr auto operator()(Return (Class::*pmf)(Args...), std::false_type = {}) const noexcept
+                              -> decltype(pmf) { return pmf; }
+
+    template <typename Return, typename Class>
+    constexpr auto operator()(Return (Class::*pmf)(Args...) const, std::true_type) const noexcept
+                              -> decltype(pmf) { return pmf; }
+};
+NAMESPACE_END(detail)
+
+// overload_cast requires variable templates: C++14
+#if defined(PYBIND11_CPP14)
+#define PYBIND11_OVERLOAD_CAST 1
+/// Syntax sugar for resolving overloaded function pointers:
+///  - regular: static_cast<Return (Class::*)(Arg0, Arg1, Arg2)>(&Class::func)
+///  - sweet:   overload_cast<Arg0, Arg1, Arg2>(&Class::func)
+template <typename... Args>
+static constexpr detail::overload_cast_impl<Args...> overload_cast = {};
+// MSVC 2015 only accepts this particular initialization syntax for this variable template.
+#endif
+
+/// Const member function selector for overload_cast
+///  - regular: static_cast<Return (Class::*)(Arg) const>(&Class::func)
+///  - sweet:   overload_cast<Arg>(&Class::func, const_)
+static constexpr auto const_ = std::true_type{};
+
+#if !defined(PYBIND11_CPP14) // no overload_cast: providing something that static_assert-fails:
+template <typename... Args> struct overload_cast {
+    static_assert(detail::deferred_t<std::false_type, Args...>::value,
+                  "pybind11::overload_cast<...> requires compiling in C++14 mode");
+};
+#endif // overload_cast
+
+NAMESPACE_BEGIN(detail)
+
+// Adaptor for converting arbitrary container arguments into a vector; implicitly convertible from
+// any standard container (or C-style array) supporting std::begin/std::end, any singleton
+// arithmetic type (if T is arithmetic), or explicitly constructible from an iterator pair.
+template <typename T>
+class any_container {
+    std::vector<T> v;
+public:
+    any_container() = default;
+
+    // Can construct from a pair of iterators
+    template <typename It, typename = enable_if_t<is_input_iterator<It>::value>>
+    any_container(It first, It last) : v(first, last) { }
+
+    // Implicit conversion constructor from any arbitrary container type with values convertible to T
+    template <typename Container, typename = enable_if_t<std::is_convertible<decltype(*std::begin(std::declval<const Container &>())), T>::value>>
+    any_container(const Container &c) : any_container(std::begin(c), std::end(c)) { }
+
+    // initializer_list's aren't deducible, so don't get matched by the above template; we need this
+    // to explicitly allow implicit conversion from one:
+    template <typename TIn, typename = enable_if_t<std::is_convertible<TIn, T>::value>>
+    any_container(const std::initializer_list<TIn> &c) : any_container(c.begin(), c.end()) { }
+
+    // Avoid copying if given an rvalue vector of the correct type.
+    any_container(std::vector<T> &&v) : v(std::move(v)) { }
+
+    // Moves the vector out of an rvalue any_container
+    operator std::vector<T> &&() && { return std::move(v); }
+
+    // Dereferencing obtains a reference to the underlying vector
+    std::vector<T> &operator*() { return v; }
+    const std::vector<T> &operator*() const { return v; }
+
+    // -> lets you call methods on the underlying vector
+    std::vector<T> *operator->() { return &v; }
+    const std::vector<T> *operator->() const { return &v; }
+};
+
+NAMESPACE_END(detail)
+
+
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/detail/descr.h b/3rdparty/pybind11/include/pybind11/detail/descr.h
new file mode 100644
index 00000000..8d404e53
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/detail/descr.h
@@ -0,0 +1,100 @@
+/*
+    pybind11/detail/descr.h: Helper type for concatenating type signatures at compile time
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "common.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+#if !defined(_MSC_VER)
+#  define PYBIND11_DESCR_CONSTEXPR static constexpr
+#else
+#  define PYBIND11_DESCR_CONSTEXPR const
+#endif
+
+/* Concatenate type signatures at compile time */
+template <size_t N, typename... Ts>
+struct descr {
+    char text[N + 1];
+
+    constexpr descr() : text{'\0'} { }
+    constexpr descr(char const (&s)[N+1]) : descr(s, make_index_sequence<N>()) { }
+
+    template <size_t... Is>
+    constexpr descr(char const (&s)[N+1], index_sequence<Is...>) : text{s[Is]..., '\0'} { }
+
+    template <typename... Chars>
+    constexpr descr(char c, Chars... cs) : text{c, static_cast<char>(cs)..., '\0'} { }
+
+    static constexpr std::array<const std::type_info *, sizeof...(Ts) + 1> types() {
+        return {{&typeid(Ts)..., nullptr}};
+    }
+};
+
+template <size_t N1, size_t N2, typename... Ts1, typename... Ts2, size_t... Is1, size_t... Is2>
+constexpr descr<N1 + N2, Ts1..., Ts2...> plus_impl(const descr<N1, Ts1...> &a, const descr<N2, Ts2...> &b,
+                                                   index_sequence<Is1...>, index_sequence<Is2...>) {
+    return {a.text[Is1]..., b.text[Is2]...};
+}
+
+template <size_t N1, size_t N2, typename... Ts1, typename... Ts2>
+constexpr descr<N1 + N2, Ts1..., Ts2...> operator+(const descr<N1, Ts1...> &a, const descr<N2, Ts2...> &b) {
+    return plus_impl(a, b, make_index_sequence<N1>(), make_index_sequence<N2>());
+}
+
+template <size_t N>
+constexpr descr<N - 1> _(char const(&text)[N]) { return descr<N - 1>(text); }
+constexpr descr<0> _(char const(&)[1]) { return {}; }
+
+template <size_t Rem, size_t... Digits> struct int_to_str : int_to_str<Rem/10, Rem%10, Digits...> { };
+template <size_t...Digits> struct int_to_str<0, Digits...> {
+    static constexpr auto digits = descr<sizeof...(Digits)>(('0' + Digits)...);
+};
+
+// Ternary description (like std::conditional)
+template <bool B, size_t N1, size_t N2>
+constexpr enable_if_t<B, descr<N1 - 1>> _(char const(&text1)[N1], char const(&)[N2]) {
+    return _(text1);
+}
+template <bool B, size_t N1, size_t N2>
+constexpr enable_if_t<!B, descr<N2 - 1>> _(char const(&)[N1], char const(&text2)[N2]) {
+    return _(text2);
+}
+
+template <bool B, typename T1, typename T2>
+constexpr enable_if_t<B, T1> _(const T1 &d, const T2 &) { return d; }
+template <bool B, typename T1, typename T2>
+constexpr enable_if_t<!B, T2> _(const T1 &, const T2 &d) { return d; }
+
+template <size_t Size> auto constexpr _() -> decltype(int_to_str<Size / 10, Size % 10>::digits) {
+    return int_to_str<Size / 10, Size % 10>::digits;
+}
+
+template <typename Type> constexpr descr<1, Type> _() { return {'%'}; }
+
+constexpr descr<0> concat() { return {}; }
+
+template <size_t N, typename... Ts>
+constexpr descr<N, Ts...> concat(const descr<N, Ts...> &descr) { return descr; }
+
+template <size_t N, typename... Ts, typename... Args>
+constexpr auto concat(const descr<N, Ts...> &d, const Args &...args)
+    -> decltype(std::declval<descr<N + 2, Ts...>>() + concat(args...)) {
+    return d + _(", ") + concat(args...);
+}
+
+template <size_t N, typename... Ts>
+constexpr descr<N + 2, Ts...> type_descr(const descr<N, Ts...> &descr) {
+    return _("{") + descr + _("}");
+}
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/detail/init.h b/3rdparty/pybind11/include/pybind11/detail/init.h
new file mode 100644
index 00000000..acfe00bd
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/detail/init.h
@@ -0,0 +1,335 @@
+/*
+    pybind11/detail/init.h: init factory function implementation and support code.
+
+    Copyright (c) 2017 Jason Rhinelander <jason@imaginary.ca>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "class.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+template <>
+class type_caster<value_and_holder> {
+public:
+    bool load(handle h, bool) {
+        value = reinterpret_cast<value_and_holder *>(h.ptr());
+        return true;
+    }
+
+    template <typename> using cast_op_type = value_and_holder &;
+    operator value_and_holder &() { return *value; }
+    static constexpr auto name = _<value_and_holder>();
+
+private:
+    value_and_holder *value = nullptr;
+};
+
+NAMESPACE_BEGIN(initimpl)
+
+inline void no_nullptr(void *ptr) {
+    if (!ptr) throw type_error("pybind11::init(): factory function returned nullptr");
+}
+
+// Implementing functions for all forms of py::init<...> and py::init(...)
+template <typename Class> using Cpp = typename Class::type;
+template <typename Class> using Alias = typename Class::type_alias;
+template <typename Class> using Holder = typename Class::holder_type;
+
+template <typename Class> using is_alias_constructible = std::is_constructible<Alias<Class>, Cpp<Class> &&>;
+
+// Takes a Cpp pointer and returns true if it actually is a polymorphic Alias instance.
+template <typename Class, enable_if_t<Class::has_alias, int> = 0>
+bool is_alias(Cpp<Class> *ptr) {
+    return dynamic_cast<Alias<Class> *>(ptr) != nullptr;
+}
+// Failing fallback version of the above for a no-alias class (always returns false)
+template <typename /*Class*/>
+constexpr bool is_alias(void *) { return false; }
+
+// Constructs and returns a new object; if the given arguments don't map to a constructor, we fall
+// back to brace aggregate initiailization so that for aggregate initialization can be used with
+// py::init, e.g.  `py::init<int, int>` to initialize a `struct T { int a; int b; }`.  For
+// non-aggregate types, we need to use an ordinary T(...) constructor (invoking as `T{...}` usually
+// works, but will not do the expected thing when `T` has an `initializer_list<T>` constructor).
+template <typename Class, typename... Args, detail::enable_if_t<std::is_constructible<Class, Args...>::value, int> = 0>
+inline Class *construct_or_initialize(Args &&...args) { return new Class(std::forward<Args>(args)...); }
+template <typename Class, typename... Args, detail::enable_if_t<!std::is_constructible<Class, Args...>::value, int> = 0>
+inline Class *construct_or_initialize(Args &&...args) { return new Class{std::forward<Args>(args)...}; }
+
+// Attempts to constructs an alias using a `Alias(Cpp &&)` constructor.  This allows types with
+// an alias to provide only a single Cpp factory function as long as the Alias can be
+// constructed from an rvalue reference of the base Cpp type.  This means that Alias classes
+// can, when appropriate, simply define a `Alias(Cpp &&)` constructor rather than needing to
+// inherit all the base class constructors.
+template <typename Class>
+void construct_alias_from_cpp(std::true_type /*is_alias_constructible*/,
+                              value_and_holder &v_h, Cpp<Class> &&base) {
+    v_h.value_ptr() = new Alias<Class>(std::move(base));
+}
+template <typename Class>
+[[noreturn]] void construct_alias_from_cpp(std::false_type /*!is_alias_constructible*/,
+                                           value_and_holder &, Cpp<Class> &&) {
+    throw type_error("pybind11::init(): unable to convert returned instance to required "
+                     "alias class: no `Alias<Class>(Class &&)` constructor available");
+}
+
+// Error-generating fallback for factories that don't match one of the below construction
+// mechanisms.
+template <typename Class>
+void construct(...) {
+    static_assert(!std::is_same<Class, Class>::value /* always false */,
+            "pybind11::init(): init function must return a compatible pointer, "
+            "holder, or value");
+}
+
+// Pointer return v1: the factory function returns a class pointer for a registered class.
+// If we don't need an alias (because this class doesn't have one, or because the final type is
+// inherited on the Python side) we can simply take over ownership.  Otherwise we need to try to
+// construct an Alias from the returned base instance.
+template <typename Class>
+void construct(value_and_holder &v_h, Cpp<Class> *ptr, bool need_alias) {
+    no_nullptr(ptr);
+    if (Class::has_alias && need_alias && !is_alias<Class>(ptr)) {
+        // We're going to try to construct an alias by moving the cpp type.  Whether or not
+        // that succeeds, we still need to destroy the original cpp pointer (either the
+        // moved away leftover, if the alias construction works, or the value itself if we
+        // throw an error), but we can't just call `delete ptr`: it might have a special
+        // deleter, or might be shared_from_this.  So we construct a holder around it as if
+        // it was a normal instance, then steal the holder away into a local variable; thus
+        // the holder and destruction happens when we leave the C++ scope, and the holder
+        // class gets to handle the destruction however it likes.
+        v_h.value_ptr() = ptr;
+        v_h.set_instance_registered(true); // To prevent init_instance from registering it
+        v_h.type->init_instance(v_h.inst, nullptr); // Set up the holder
+        Holder<Class> temp_holder(std::move(v_h.holder<Holder<Class>>())); // Steal the holder
+        v_h.type->dealloc(v_h); // Destroys the moved-out holder remains, resets value ptr to null
+        v_h.set_instance_registered(false);
+
+        construct_alias_from_cpp<Class>(is_alias_constructible<Class>{}, v_h, std::move(*ptr));
+    } else {
+        // Otherwise the type isn't inherited, so we don't need an Alias
+        v_h.value_ptr() = ptr;
+    }
+}
+
+// Pointer return v2: a factory that always returns an alias instance ptr.  We simply take over
+// ownership of the pointer.
+template <typename Class, enable_if_t<Class::has_alias, int> = 0>
+void construct(value_and_holder &v_h, Alias<Class> *alias_ptr, bool) {
+    no_nullptr(alias_ptr);
+    v_h.value_ptr() = static_cast<Cpp<Class> *>(alias_ptr);
+}
+
+// Holder return: copy its pointer, and move or copy the returned holder into the new instance's
+// holder.  This also handles types like std::shared_ptr<T> and std::unique_ptr<T> where T is a
+// derived type (through those holder's implicit conversion from derived class holder constructors).
+template <typename Class>
+void construct(value_and_holder &v_h, Holder<Class> holder, bool need_alias) {
+    auto *ptr = holder_helper<Holder<Class>>::get(holder);
+    // If we need an alias, check that the held pointer is actually an alias instance
+    if (Class::has_alias && need_alias && !is_alias<Class>(ptr))
+        throw type_error("pybind11::init(): construction failed: returned holder-wrapped instance "
+                         "is not an alias instance");
+
+    v_h.value_ptr() = ptr;
+    v_h.type->init_instance(v_h.inst, &holder);
+}
+
+// return-by-value version 1: returning a cpp class by value.  If the class has an alias and an
+// alias is required the alias must have an `Alias(Cpp &&)` constructor so that we can construct
+// the alias from the base when needed (i.e. because of Python-side inheritance).  When we don't
+// need it, we simply move-construct the cpp value into a new instance.
+template <typename Class>
+void construct(value_and_holder &v_h, Cpp<Class> &&result, bool need_alias) {
+    static_assert(std::is_move_constructible<Cpp<Class>>::value,
+        "pybind11::init() return-by-value factory function requires a movable class");
+    if (Class::has_alias && need_alias)
+        construct_alias_from_cpp<Class>(is_alias_constructible<Class>{}, v_h, std::move(result));
+    else
+        v_h.value_ptr() = new Cpp<Class>(std::move(result));
+}
+
+// return-by-value version 2: returning a value of the alias type itself.  We move-construct an
+// Alias instance (even if no the python-side inheritance is involved).  The is intended for
+// cases where Alias initialization is always desired.
+template <typename Class>
+void construct(value_and_holder &v_h, Alias<Class> &&result, bool) {
+    static_assert(std::is_move_constructible<Alias<Class>>::value,
+        "pybind11::init() return-by-alias-value factory function requires a movable alias class");
+    v_h.value_ptr() = new Alias<Class>(std::move(result));
+}
+
+// Implementing class for py::init<...>()
+template <typename... Args>
+struct constructor {
+    template <typename Class, typename... Extra, enable_if_t<!Class::has_alias, int> = 0>
+    static void execute(Class &cl, const Extra&... extra) {
+        cl.def("__init__", [](value_and_holder &v_h, Args... args) {
+            v_h.value_ptr() = construct_or_initialize<Cpp<Class>>(std::forward<Args>(args)...);
+        }, is_new_style_constructor(), extra...);
+    }
+
+    template <typename Class, typename... Extra,
+              enable_if_t<Class::has_alias &&
+                          std::is_constructible<Cpp<Class>, Args...>::value, int> = 0>
+    static void execute(Class &cl, const Extra&... extra) {
+        cl.def("__init__", [](value_and_holder &v_h, Args... args) {
+            if (Py_TYPE(v_h.inst) == v_h.type->type)
+                v_h.value_ptr() = construct_or_initialize<Cpp<Class>>(std::forward<Args>(args)...);
+            else
+                v_h.value_ptr() = construct_or_initialize<Alias<Class>>(std::forward<Args>(args)...);
+        }, is_new_style_constructor(), extra...);
+    }
+
+    template <typename Class, typename... Extra,
+              enable_if_t<Class::has_alias &&
+                          !std::is_constructible<Cpp<Class>, Args...>::value, int> = 0>
+    static void execute(Class &cl, const Extra&... extra) {
+        cl.def("__init__", [](value_and_holder &v_h, Args... args) {
+            v_h.value_ptr() = construct_or_initialize<Alias<Class>>(std::forward<Args>(args)...);
+        }, is_new_style_constructor(), extra...);
+    }
+};
+
+// Implementing class for py::init_alias<...>()
+template <typename... Args> struct alias_constructor {
+    template <typename Class, typename... Extra,
+              enable_if_t<Class::has_alias && std::is_constructible<Alias<Class>, Args...>::value, int> = 0>
+    static void execute(Class &cl, const Extra&... extra) {
+        cl.def("__init__", [](value_and_holder &v_h, Args... args) {
+            v_h.value_ptr() = construct_or_initialize<Alias<Class>>(std::forward<Args>(args)...);
+        }, is_new_style_constructor(), extra...);
+    }
+};
+
+// Implementation class for py::init(Func) and py::init(Func, AliasFunc)
+template <typename CFunc, typename AFunc = void_type (*)(),
+          typename = function_signature_t<CFunc>, typename = function_signature_t<AFunc>>
+struct factory;
+
+// Specialization for py::init(Func)
+template <typename Func, typename Return, typename... Args>
+struct factory<Func, void_type (*)(), Return(Args...)> {
+    remove_reference_t<Func> class_factory;
+
+    factory(Func &&f) : class_factory(std::forward<Func>(f)) { }
+
+    // The given class either has no alias or has no separate alias factory;
+    // this always constructs the class itself.  If the class is registered with an alias
+    // type and an alias instance is needed (i.e. because the final type is a Python class
+    // inheriting from the C++ type) the returned value needs to either already be an alias
+    // instance, or the alias needs to be constructible from a `Class &&` argument.
+    template <typename Class, typename... Extra>
+    void execute(Class &cl, const Extra &...extra) && {
+        #if defined(PYBIND11_CPP14)
+        cl.def("__init__", [func = std::move(class_factory)]
+        #else
+        auto &func = class_factory;
+        cl.def("__init__", [func]
+        #endif
+        (value_and_holder &v_h, Args... args) {
+            construct<Class>(v_h, func(std::forward<Args>(args)...),
+                             Py_TYPE(v_h.inst) != v_h.type->type);
+        }, is_new_style_constructor(), extra...);
+    }
+};
+
+// Specialization for py::init(Func, AliasFunc)
+template <typename CFunc, typename AFunc,
+          typename CReturn, typename... CArgs, typename AReturn, typename... AArgs>
+struct factory<CFunc, AFunc, CReturn(CArgs...), AReturn(AArgs...)> {
+    static_assert(sizeof...(CArgs) == sizeof...(AArgs),
+                  "pybind11::init(class_factory, alias_factory): class and alias factories "
+                  "must have identical argument signatures");
+    static_assert(all_of<std::is_same<CArgs, AArgs>...>::value,
+                  "pybind11::init(class_factory, alias_factory): class and alias factories "
+                  "must have identical argument signatures");
+
+    remove_reference_t<CFunc> class_factory;
+    remove_reference_t<AFunc> alias_factory;
+
+    factory(CFunc &&c, AFunc &&a)
+        : class_factory(std::forward<CFunc>(c)), alias_factory(std::forward<AFunc>(a)) { }
+
+    // The class factory is called when the `self` type passed to `__init__` is the direct
+    // class (i.e. not inherited), the alias factory when `self` is a Python-side subtype.
+    template <typename Class, typename... Extra>
+    void execute(Class &cl, const Extra&... extra) && {
+        static_assert(Class::has_alias, "The two-argument version of `py::init()` can "
+                                        "only be used if the class has an alias");
+        #if defined(PYBIND11_CPP14)
+        cl.def("__init__", [class_func = std::move(class_factory), alias_func = std::move(alias_factory)]
+        #else
+        auto &class_func = class_factory;
+        auto &alias_func = alias_factory;
+        cl.def("__init__", [class_func, alias_func]
+        #endif
+        (value_and_holder &v_h, CArgs... args) {
+            if (Py_TYPE(v_h.inst) == v_h.type->type)
+                // If the instance type equals the registered type we don't have inheritance, so
+                // don't need the alias and can construct using the class function:
+                construct<Class>(v_h, class_func(std::forward<CArgs>(args)...), false);
+            else
+                construct<Class>(v_h, alias_func(std::forward<CArgs>(args)...), true);
+        }, is_new_style_constructor(), extra...);
+    }
+};
+
+/// Set just the C++ state. Same as `__init__`.
+template <typename Class, typename T>
+void setstate(value_and_holder &v_h, T &&result, bool need_alias) {
+    construct<Class>(v_h, std::forward<T>(result), need_alias);
+}
+
+/// Set both the C++ and Python states
+template <typename Class, typename T, typename O,
+          enable_if_t<std::is_convertible<O, handle>::value, int> = 0>
+void setstate(value_and_holder &v_h, std::pair<T, O> &&result, bool need_alias) {
+    construct<Class>(v_h, std::move(result.first), need_alias);
+    setattr((PyObject *) v_h.inst, "__dict__", result.second);
+}
+
+/// Implementation for py::pickle(GetState, SetState)
+template <typename Get, typename Set,
+          typename = function_signature_t<Get>, typename = function_signature_t<Set>>
+struct pickle_factory;
+
+template <typename Get, typename Set,
+          typename RetState, typename Self, typename NewInstance, typename ArgState>
+struct pickle_factory<Get, Set, RetState(Self), NewInstance(ArgState)> {
+    static_assert(std::is_same<intrinsic_t<RetState>, intrinsic_t<ArgState>>::value,
+                  "The type returned by `__getstate__` must be the same "
+                  "as the argument accepted by `__setstate__`");
+
+    remove_reference_t<Get> get;
+    remove_reference_t<Set> set;
+
+    pickle_factory(Get get, Set set)
+        : get(std::forward<Get>(get)), set(std::forward<Set>(set)) { }
+
+    template <typename Class, typename... Extra>
+    void execute(Class &cl, const Extra &...extra) && {
+        cl.def("__getstate__", std::move(get));
+
+#if defined(PYBIND11_CPP14)
+        cl.def("__setstate__", [func = std::move(set)]
+#else
+        auto &func = set;
+        cl.def("__setstate__", [func]
+#endif
+        (value_and_holder &v_h, ArgState state) {
+            setstate<Class>(v_h, func(std::forward<ArgState>(state)),
+                            Py_TYPE(v_h.inst) != v_h.type->type);
+        }, is_new_style_constructor(), extra...);
+    }
+};
+
+NAMESPACE_END(initimpl)
+NAMESPACE_END(detail)
+NAMESPACE_END(pybind11)
diff --git a/3rdparty/pybind11/include/pybind11/detail/internals.h b/3rdparty/pybind11/include/pybind11/detail/internals.h
new file mode 100644
index 00000000..6224dfb2
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/detail/internals.h
@@ -0,0 +1,349 @@
+/*
+    pybind11/detail/internals.h: Internal data structure and related functions
+
+    Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "../pytypes.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+// Forward declarations
+inline PyTypeObject *make_static_property_type();
+inline PyTypeObject *make_default_metaclass();
+inline PyObject *make_object_base_type(PyTypeObject *metaclass);
+
+// The old Python Thread Local Storage (TLS) API is deprecated in Python 3.7 in favor of the new
+// Thread Specific Storage (TSS) API.
+#if PY_VERSION_HEX >= 0x03070000
+#    define PYBIND11_TLS_KEY_INIT(var) Py_tss_t *var = nullptr
+#    define PYBIND11_TLS_GET_VALUE(key) PyThread_tss_get((key))
+#    define PYBIND11_TLS_REPLACE_VALUE(key, value) PyThread_tss_set((key), (value))
+#    define PYBIND11_TLS_DELETE_VALUE(key) PyThread_tss_set((key), nullptr)
+#    define PYBIND11_TLS_FREE(key) PyThread_tss_free(key)
+#else
+    // Usually an int but a long on Cygwin64 with Python 3.x
+#    define PYBIND11_TLS_KEY_INIT(var) decltype(PyThread_create_key()) var = 0
+#    define PYBIND11_TLS_GET_VALUE(key) PyThread_get_key_value((key))
+#    if PY_MAJOR_VERSION < 3
+#        define PYBIND11_TLS_DELETE_VALUE(key)                               \
+             PyThread_delete_key_value(key)
+#        define PYBIND11_TLS_REPLACE_VALUE(key, value)                       \
+             do {                                                            \
+                 PyThread_delete_key_value((key));                           \
+                 PyThread_set_key_value((key), (value));                     \
+             } while (false)
+#    else
+#        define PYBIND11_TLS_DELETE_VALUE(key)                               \
+             PyThread_set_key_value((key), nullptr)
+#        define PYBIND11_TLS_REPLACE_VALUE(key, value)                       \
+             PyThread_set_key_value((key), (value))
+#    endif
+#    define PYBIND11_TLS_FREE(key) (void)key
+#endif
+
+// Python loads modules by default with dlopen with the RTLD_LOCAL flag; under libc++ and possibly
+// other STLs, this means `typeid(A)` from one module won't equal `typeid(A)` from another module
+// even when `A` is the same, non-hidden-visibility type (e.g. from a common include).  Under
+// libstdc++, this doesn't happen: equality and the type_index hash are based on the type name,
+// which works.  If not under a known-good stl, provide our own name-based hash and equality
+// functions that use the type name.
+#if defined(__GLIBCXX__)
+inline bool same_type(const std::type_info &lhs, const std::type_info &rhs) { return lhs == rhs; }
+using type_hash = std::hash<std::type_index>;
+using type_equal_to = std::equal_to<std::type_index>;
+#else
+inline bool same_type(const std::type_info &lhs, const std::type_info &rhs) {
+    return lhs.name() == rhs.name() || std::strcmp(lhs.name(), rhs.name()) == 0;
+}
+
+struct type_hash {
+    size_t operator()(const std::type_index &t) const {
+        size_t hash = 5381;
+        const char *ptr = t.name();
+        while (auto c = static_cast<unsigned char>(*ptr++))
+            hash = (hash * 33) ^ c;
+        return hash;
+    }
+};
+
+struct type_equal_to {
+    bool operator()(const std::type_index &lhs, const std::type_index &rhs) const {
+        return lhs.name() == rhs.name() || std::strcmp(lhs.name(), rhs.name()) == 0;
+    }
+};
+#endif
+
+template <typename value_type>
+using type_map = std::unordered_map<std::type_index, value_type, type_hash, type_equal_to>;
+
+struct overload_hash {
+    inline size_t operator()(const std::pair<const PyObject *, const char *>& v) const {
+        size_t value = std::hash<const void *>()(v.first);
+        value ^= std::hash<const void *>()(v.second)  + 0x9e3779b9 + (value<<6) + (value>>2);
+        return value;
+    }
+};
+
+/// Internal data structure used to track registered instances and types.
+/// Whenever binary incompatible changes are made to this structure,
+/// `PYBIND11_INTERNALS_VERSION` must be incremented.
+struct internals {
+    type_map<type_info *> registered_types_cpp; // std::type_index -> pybind11's type information
+    std::unordered_map<PyTypeObject *, std::vector<type_info *>> registered_types_py; // PyTypeObject* -> base type_info(s)
+    std::unordered_multimap<const void *, instance*> registered_instances; // void * -> instance*
+    std::unordered_set<std::pair<const PyObject *, const char *>, overload_hash> inactive_overload_cache;
+    type_map<std::vector<bool (*)(PyObject *, void *&)>> direct_conversions;
+    std::unordered_map<const PyObject *, std::vector<PyObject *>> patients;
+    std::forward_list<void (*) (std::exception_ptr)> registered_exception_translators;
+    std::unordered_map<std::string, void *> shared_data; // Custom data to be shared across extensions
+    std::vector<PyObject *> loader_patient_stack; // Used by `loader_life_support`
+    std::forward_list<std::string> static_strings; // Stores the std::strings backing detail::c_str()
+    PyTypeObject *static_property_type;
+    PyTypeObject *default_metaclass;
+    PyObject *instance_base;
+#if defined(WITH_THREAD)
+    PYBIND11_TLS_KEY_INIT(tstate);
+    PyInterpreterState *istate = nullptr;
+    ~internals() {
+        // This destructor is called *after* Py_Finalize() in finalize_interpreter().
+        // That *SHOULD BE* fine. The following details what happens whe PyThread_tss_free is called.
+        // PYBIND11_TLS_FREE is PyThread_tss_free on python 3.7+. On older python, it does nothing.
+        // PyThread_tss_free calls PyThread_tss_delete and PyMem_RawFree.
+        // PyThread_tss_delete just calls TlsFree (on Windows) or pthread_key_delete (on *NIX). Neither
+        // of those have anything to do with CPython internals.
+        // PyMem_RawFree *requires* that the `tstate` be allocated with the CPython allocator.
+        PYBIND11_TLS_FREE(tstate);
+    }
+#endif
+};
+
+/// Additional type information which does not fit into the PyTypeObject.
+/// Changes to this struct also require bumping `PYBIND11_INTERNALS_VERSION`.
+struct type_info {
+    PyTypeObject *type;
+    const std::type_info *cpptype;
+    size_t type_size, type_align, holder_size_in_ptrs;
+    void *(*operator_new)(size_t);
+    void (*init_instance)(instance *, const void *);
+    void (*dealloc)(value_and_holder &v_h);
+    std::vector<PyObject *(*)(PyObject *, PyTypeObject *)> implicit_conversions;
+    std::vector<std::pair<const std::type_info *, void *(*)(void *)>> implicit_casts;
+    std::vector<bool (*)(PyObject *, void *&)> *direct_conversions;
+    buffer_info *(*get_buffer)(PyObject *, void *) = nullptr;
+    void *get_buffer_data = nullptr;
+    void *(*module_local_load)(PyObject *, const type_info *) = nullptr;
+    /* A simple type never occurs as a (direct or indirect) parent
+     * of a class that makes use of multiple inheritance */
+    bool simple_type : 1;
+    /* True if there is no multiple inheritance in this type's inheritance tree */
+    bool simple_ancestors : 1;
+    /* for base vs derived holder_type checks */
+    bool default_holder : 1;
+    /* true if this is a type registered with py::module_local */
+    bool module_local : 1;
+};
+
+/// Tracks the `internals` and `type_info` ABI version independent of the main library version
+#define PYBIND11_INTERNALS_VERSION 4
+
+/// On MSVC, debug and release builds are not ABI-compatible!
+#if defined(_MSC_VER) && defined(_DEBUG)
+#   define PYBIND11_BUILD_TYPE "_debug"
+#else
+#   define PYBIND11_BUILD_TYPE ""
+#endif
+
+/// Let's assume that different compilers are ABI-incompatible.
+#if defined(_MSC_VER)
+#   define PYBIND11_COMPILER_TYPE "_msvc"
+#elif defined(__INTEL_COMPILER)
+#   define PYBIND11_COMPILER_TYPE "_icc"
+#elif defined(__clang__)
+#   define PYBIND11_COMPILER_TYPE "_clang"
+#elif defined(__PGI)
+#   define PYBIND11_COMPILER_TYPE "_pgi"
+#elif defined(__MINGW32__)
+#   define PYBIND11_COMPILER_TYPE "_mingw"
+#elif defined(__CYGWIN__)
+#   define PYBIND11_COMPILER_TYPE "_gcc_cygwin"
+#elif defined(__GNUC__)
+#   define PYBIND11_COMPILER_TYPE "_gcc"
+#else
+#   define PYBIND11_COMPILER_TYPE "_unknown"
+#endif
+
+#if defined(_LIBCPP_VERSION)
+#  define PYBIND11_STDLIB "_libcpp"
+#elif defined(__GLIBCXX__) || defined(__GLIBCPP__)
+#  define PYBIND11_STDLIB "_libstdcpp"
+#else
+#  define PYBIND11_STDLIB ""
+#endif
+
+/// On Linux/OSX, changes in __GXX_ABI_VERSION__ indicate ABI incompatibility.
+#if defined(__GXX_ABI_VERSION)
+#  define PYBIND11_BUILD_ABI "_cxxabi" PYBIND11_TOSTRING(__GXX_ABI_VERSION)
+#else
+#  define PYBIND11_BUILD_ABI ""
+#endif
+
+#if defined(WITH_THREAD)
+#  define PYBIND11_INTERNALS_KIND ""
+#else
+#  define PYBIND11_INTERNALS_KIND "_without_thread"
+#endif
+
+#define PYBIND11_INTERNALS_ID "__pybind11_internals_v" \
+    PYBIND11_TOSTRING(PYBIND11_INTERNALS_VERSION) PYBIND11_INTERNALS_KIND PYBIND11_COMPILER_TYPE PYBIND11_STDLIB PYBIND11_BUILD_ABI PYBIND11_BUILD_TYPE "__"
+
+#define PYBIND11_MODULE_LOCAL_ID "__pybind11_module_local_v" \
+    PYBIND11_TOSTRING(PYBIND11_INTERNALS_VERSION) PYBIND11_INTERNALS_KIND PYBIND11_COMPILER_TYPE PYBIND11_STDLIB PYBIND11_BUILD_ABI PYBIND11_BUILD_TYPE "__"
+
+/// Each module locally stores a pointer to the `internals` data. The data
+/// itself is shared among modules with the same `PYBIND11_INTERNALS_ID`.
+inline internals **&get_internals_pp() {
+    static internals **internals_pp = nullptr;
+    return internals_pp;
+}
+
+inline void translate_exception(std::exception_ptr p) {
+    try {
+        if (p) std::rethrow_exception(p);
+    } catch (error_already_set &e)           { e.restore();                                    return;
+    } catch (const builtin_exception &e)     { e.set_error();                                  return;
+    } catch (const std::bad_alloc &e)        { PyErr_SetString(PyExc_MemoryError,   e.what()); return;
+    } catch (const std::domain_error &e)     { PyErr_SetString(PyExc_ValueError,    e.what()); return;
+    } catch (const std::invalid_argument &e) { PyErr_SetString(PyExc_ValueError,    e.what()); return;
+    } catch (const std::length_error &e)     { PyErr_SetString(PyExc_ValueError,    e.what()); return;
+    } catch (const std::out_of_range &e)     { PyErr_SetString(PyExc_IndexError,    e.what()); return;
+    } catch (const std::range_error &e)      { PyErr_SetString(PyExc_ValueError,    e.what()); return;
+    } catch (const std::overflow_error &e)   { PyErr_SetString(PyExc_OverflowError, e.what()); return;
+    } catch (const std::exception &e)        { PyErr_SetString(PyExc_RuntimeError,  e.what()); return;
+    } catch (...) {
+        PyErr_SetString(PyExc_RuntimeError, "Caught an unknown exception!");
+        return;
+    }
+}
+
+#if !defined(__GLIBCXX__)
+inline void translate_local_exception(std::exception_ptr p) {
+    try {
+        if (p) std::rethrow_exception(p);
+    } catch (error_already_set &e)       { e.restore();   return;
+    } catch (const builtin_exception &e) { e.set_error(); return;
+    }
+}
+#endif
+
+/// Return a reference to the current `internals` data
+PYBIND11_NOINLINE inline internals &get_internals() {
+    auto **&internals_pp = get_internals_pp();
+    if (internals_pp && *internals_pp)
+        return **internals_pp;
+
+    // Ensure that the GIL is held since we will need to make Python calls.
+    // Cannot use py::gil_scoped_acquire here since that constructor calls get_internals.
+    struct gil_scoped_acquire_local {
+        gil_scoped_acquire_local() : state (PyGILState_Ensure()) {}
+        ~gil_scoped_acquire_local() { PyGILState_Release(state); }
+        const PyGILState_STATE state;
+    } gil;
+
+    constexpr auto *id = PYBIND11_INTERNALS_ID;
+    auto builtins = handle(PyEval_GetBuiltins());
+    if (builtins.contains(id) && isinstance<capsule>(builtins[id])) {
+        internals_pp = static_cast<internals **>(capsule(builtins[id]));
+
+        // We loaded builtins through python's builtins, which means that our `error_already_set`
+        // and `builtin_exception` may be different local classes than the ones set up in the
+        // initial exception translator, below, so add another for our local exception classes.
+        //
+        // libstdc++ doesn't require this (types there are identified only by name)
+#if !defined(__GLIBCXX__)
+        (*internals_pp)->registered_exception_translators.push_front(&translate_local_exception);
+#endif
+    } else {
+        if (!internals_pp) internals_pp = new internals*();
+        auto *&internals_ptr = *internals_pp;
+        internals_ptr = new internals();
+#if defined(WITH_THREAD)
+        PyEval_InitThreads();
+        PyThreadState *tstate = PyThreadState_Get();
+        #if PY_VERSION_HEX >= 0x03070000
+            internals_ptr->tstate = PyThread_tss_alloc();
+            if (!internals_ptr->tstate || PyThread_tss_create(internals_ptr->tstate))
+                pybind11_fail("get_internals: could not successfully initialize the TSS key!");
+            PyThread_tss_set(internals_ptr->tstate, tstate);
+        #else
+            internals_ptr->tstate = PyThread_create_key();
+            if (internals_ptr->tstate == -1)
+                pybind11_fail("get_internals: could not successfully initialize the TLS key!");
+            PyThread_set_key_value(internals_ptr->tstate, tstate);
+        #endif
+        internals_ptr->istate = tstate->interp;
+#endif
+        builtins[id] = capsule(internals_pp);
+        internals_ptr->registered_exception_translators.push_front(&translate_exception);
+        internals_ptr->static_property_type = make_static_property_type();
+        internals_ptr->default_metaclass = make_default_metaclass();
+        internals_ptr->instance_base = make_object_base_type(internals_ptr->default_metaclass);
+    }
+    return **internals_pp;
+}
+
+/// Works like `internals.registered_types_cpp`, but for module-local registered types:
+inline type_map<type_info *> &registered_local_types_cpp() {
+    static type_map<type_info *> locals{};
+    return locals;
+}
+
+/// Constructs a std::string with the given arguments, stores it in `internals`, and returns its
+/// `c_str()`.  Such strings objects have a long storage duration -- the internal strings are only
+/// cleared when the program exits or after interpreter shutdown (when embedding), and so are
+/// suitable for c-style strings needed by Python internals (such as PyTypeObject's tp_name).
+template <typename... Args>
+const char *c_str(Args &&...args) {
+    auto &strings = get_internals().static_strings;
+    strings.emplace_front(std::forward<Args>(args)...);
+    return strings.front().c_str();
+}
+
+NAMESPACE_END(detail)
+
+/// Returns a named pointer that is shared among all extension modules (using the same
+/// pybind11 version) running in the current interpreter. Names starting with underscores
+/// are reserved for internal usage. Returns `nullptr` if no matching entry was found.
+inline PYBIND11_NOINLINE void *get_shared_data(const std::string &name) {
+    auto &internals = detail::get_internals();
+    auto it = internals.shared_data.find(name);
+    return it != internals.shared_data.end() ? it->second : nullptr;
+}
+
+/// Set the shared data that can be later recovered by `get_shared_data()`.
+inline PYBIND11_NOINLINE void *set_shared_data(const std::string &name, void *data) {
+    detail::get_internals().shared_data[name] = data;
+    return data;
+}
+
+/// Returns a typed reference to a shared data entry (by using `get_shared_data()`) if
+/// such entry exists. Otherwise, a new object of default-constructible type `T` is
+/// added to the shared data under the given name and a reference to it is returned.
+template<typename T>
+T &get_or_create_shared_data(const std::string &name) {
+    auto &internals = detail::get_internals();
+    auto it = internals.shared_data.find(name);
+    T *ptr = (T *) (it != internals.shared_data.end() ? it->second : nullptr);
+    if (!ptr) {
+        ptr = new T();
+        internals.shared_data[name] = ptr;
+    }
+    return *ptr;
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/detail/typeid.h b/3rdparty/pybind11/include/pybind11/detail/typeid.h
new file mode 100644
index 00000000..9c8a4fc6
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/detail/typeid.h
@@ -0,0 +1,55 @@
+/*
+    pybind11/detail/typeid.h: Compiler-independent access to type identifiers
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include <cstdio>
+#include <cstdlib>
+
+#if defined(__GNUG__)
+#include <cxxabi.h>
+#endif
+
+#include "common.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+/// Erase all occurrences of a substring
+inline void erase_all(std::string &string, const std::string &search) {
+    for (size_t pos = 0;;) {
+        pos = string.find(search, pos);
+        if (pos == std::string::npos) break;
+        string.erase(pos, search.length());
+    }
+}
+
+PYBIND11_NOINLINE inline void clean_type_id(std::string &name) {
+#if defined(__GNUG__)
+    int status = 0;
+    std::unique_ptr<char, void (*)(void *)> res {
+        abi::__cxa_demangle(name.c_str(), nullptr, nullptr, &status), std::free };
+    if (status == 0)
+        name = res.get();
+#else
+    detail::erase_all(name, "class ");
+    detail::erase_all(name, "struct ");
+    detail::erase_all(name, "enum ");
+#endif
+    detail::erase_all(name, "pybind11::");
+}
+NAMESPACE_END(detail)
+
+/// Return a string representation of a C++ type
+template <typename T> static std::string type_id() {
+    std::string name(typeid(T).name());
+    detail::clean_type_id(name);
+    return name;
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/eigen.h b/3rdparty/pybind11/include/pybind11/eigen.h
new file mode 100644
index 00000000..d963d965
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/eigen.h
@@ -0,0 +1,607 @@
+/*
+    pybind11/eigen.h: Transparent conversion for dense and sparse Eigen matrices
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "numpy.h"
+
+#if defined(__INTEL_COMPILER)
+#  pragma warning(disable: 1682) // implicit conversion of a 64-bit integral type to a smaller integral type (potential portability problem)
+#elif defined(__GNUG__) || defined(__clang__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wconversion"
+#  pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#  ifdef __clang__
+//   Eigen generates a bunch of implicit-copy-constructor-is-deprecated warnings with -Wdeprecated
+//   under Clang, so disable that warning here:
+#    pragma GCC diagnostic ignored "-Wdeprecated"
+#  endif
+#  if __GNUC__ >= 7
+#    pragma GCC diagnostic ignored "-Wint-in-bool-context"
+#  endif
+#endif
+
+#if defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#  pragma warning(disable: 4996) // warning C4996: std::unary_negate is deprecated in C++17
+#endif
+
+#include <Eigen/Core>
+#include <Eigen/SparseCore>
+
+// Eigen prior to 3.2.7 doesn't have proper move constructors--but worse, some classes get implicit
+// move constructors that break things.  We could detect this an explicitly copy, but an extra copy
+// of matrices seems highly undesirable.
+static_assert(EIGEN_VERSION_AT_LEAST(3,2,7), "Eigen support in pybind11 requires Eigen >= 3.2.7");
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+// Provide a convenience alias for easier pass-by-ref usage with fully dynamic strides:
+using EigenDStride = Eigen::Stride<Eigen::Dynamic, Eigen::Dynamic>;
+template <typename MatrixType> using EigenDRef = Eigen::Ref<MatrixType, 0, EigenDStride>;
+template <typename MatrixType> using EigenDMap = Eigen::Map<MatrixType, 0, EigenDStride>;
+
+NAMESPACE_BEGIN(detail)
+
+#if EIGEN_VERSION_AT_LEAST(3,3,0)
+using EigenIndex = Eigen::Index;
+#else
+using EigenIndex = EIGEN_DEFAULT_DENSE_INDEX_TYPE;
+#endif
+
+// Matches Eigen::Map, Eigen::Ref, blocks, etc:
+template <typename T> using is_eigen_dense_map = all_of<is_template_base_of<Eigen::DenseBase, T>, std::is_base_of<Eigen::MapBase<T, Eigen::ReadOnlyAccessors>, T>>;
+template <typename T> using is_eigen_mutable_map = std::is_base_of<Eigen::MapBase<T, Eigen::WriteAccessors>, T>;
+template <typename T> using is_eigen_dense_plain = all_of<negation<is_eigen_dense_map<T>>, is_template_base_of<Eigen::PlainObjectBase, T>>;
+template <typename T> using is_eigen_sparse = is_template_base_of<Eigen::SparseMatrixBase, T>;
+// Test for objects inheriting from EigenBase<Derived> that aren't captured by the above.  This
+// basically covers anything that can be assigned to a dense matrix but that don't have a typical
+// matrix data layout that can be copied from their .data().  For example, DiagonalMatrix and
+// SelfAdjointView fall into this category.
+template <typename T> using is_eigen_other = all_of<
+    is_template_base_of<Eigen::EigenBase, T>,
+    negation<any_of<is_eigen_dense_map<T>, is_eigen_dense_plain<T>, is_eigen_sparse<T>>>
+>;
+
+// Captures numpy/eigen conformability status (returned by EigenProps::conformable()):
+template <bool EigenRowMajor> struct EigenConformable {
+    bool conformable = false;
+    EigenIndex rows = 0, cols = 0;
+    EigenDStride stride{0, 0};      // Only valid if negativestrides is false!
+    bool negativestrides = false;   // If true, do not use stride!
+
+    EigenConformable(bool fits = false) : conformable{fits} {}
+    // Matrix type:
+    EigenConformable(EigenIndex r, EigenIndex c,
+            EigenIndex rstride, EigenIndex cstride) :
+        conformable{true}, rows{r}, cols{c} {
+        // TODO: when Eigen bug #747 is fixed, remove the tests for non-negativity. http://eigen.tuxfamily.org/bz/show_bug.cgi?id=747
+        if (rstride < 0 || cstride < 0) {
+            negativestrides = true;
+        } else {
+            stride = {EigenRowMajor ? rstride : cstride /* outer stride */,
+                      EigenRowMajor ? cstride : rstride /* inner stride */ };
+        }
+    }
+    // Vector type:
+    EigenConformable(EigenIndex r, EigenIndex c, EigenIndex stride)
+        : EigenConformable(r, c, r == 1 ? c*stride : stride, c == 1 ? r : r*stride) {}
+
+    template <typename props> bool stride_compatible() const {
+        // To have compatible strides, we need (on both dimensions) one of fully dynamic strides,
+        // matching strides, or a dimension size of 1 (in which case the stride value is irrelevant)
+        return
+            !negativestrides &&
+            (props::inner_stride == Eigen::Dynamic || props::inner_stride == stride.inner() ||
+                (EigenRowMajor ? cols : rows) == 1) &&
+            (props::outer_stride == Eigen::Dynamic || props::outer_stride == stride.outer() ||
+                (EigenRowMajor ? rows : cols) == 1);
+    }
+    operator bool() const { return conformable; }
+};
+
+template <typename Type> struct eigen_extract_stride { using type = Type; };
+template <typename PlainObjectType, int MapOptions, typename StrideType>
+struct eigen_extract_stride<Eigen::Map<PlainObjectType, MapOptions, StrideType>> { using type = StrideType; };
+template <typename PlainObjectType, int Options, typename StrideType>
+struct eigen_extract_stride<Eigen::Ref<PlainObjectType, Options, StrideType>> { using type = StrideType; };
+
+// Helper struct for extracting information from an Eigen type
+template <typename Type_> struct EigenProps {
+    using Type = Type_;
+    using Scalar = typename Type::Scalar;
+    using StrideType = typename eigen_extract_stride<Type>::type;
+    static constexpr EigenIndex
+        rows = Type::RowsAtCompileTime,
+        cols = Type::ColsAtCompileTime,
+        size = Type::SizeAtCompileTime;
+    static constexpr bool
+        row_major = Type::IsRowMajor,
+        vector = Type::IsVectorAtCompileTime, // At least one dimension has fixed size 1
+        fixed_rows = rows != Eigen::Dynamic,
+        fixed_cols = cols != Eigen::Dynamic,
+        fixed = size != Eigen::Dynamic, // Fully-fixed size
+        dynamic = !fixed_rows && !fixed_cols; // Fully-dynamic size
+
+    template <EigenIndex i, EigenIndex ifzero> using if_zero = std::integral_constant<EigenIndex, i == 0 ? ifzero : i>;
+    static constexpr EigenIndex inner_stride = if_zero<StrideType::InnerStrideAtCompileTime, 1>::value,
+                                outer_stride = if_zero<StrideType::OuterStrideAtCompileTime,
+                                                       vector ? size : row_major ? cols : rows>::value;
+    static constexpr bool dynamic_stride = inner_stride == Eigen::Dynamic && outer_stride == Eigen::Dynamic;
+    static constexpr bool requires_row_major = !dynamic_stride && !vector && (row_major ? inner_stride : outer_stride) == 1;
+    static constexpr bool requires_col_major = !dynamic_stride && !vector && (row_major ? outer_stride : inner_stride) == 1;
+
+    // Takes an input array and determines whether we can make it fit into the Eigen type.  If
+    // the array is a vector, we attempt to fit it into either an Eigen 1xN or Nx1 vector
+    // (preferring the latter if it will fit in either, i.e. for a fully dynamic matrix type).
+    static EigenConformable<row_major> conformable(const array &a) {
+        const auto dims = a.ndim();
+        if (dims < 1 || dims > 2)
+            return false;
+
+        if (dims == 2) { // Matrix type: require exact match (or dynamic)
+
+            EigenIndex
+                np_rows = a.shape(0),
+                np_cols = a.shape(1),
+                np_rstride = a.strides(0) / static_cast<ssize_t>(sizeof(Scalar)),
+                np_cstride = a.strides(1) / static_cast<ssize_t>(sizeof(Scalar));
+            if ((fixed_rows && np_rows != rows) || (fixed_cols && np_cols != cols))
+                return false;
+
+            return {np_rows, np_cols, np_rstride, np_cstride};
+        }
+
+        // Otherwise we're storing an n-vector.  Only one of the strides will be used, but whichever
+        // is used, we want the (single) numpy stride value.
+        const EigenIndex n = a.shape(0),
+              stride = a.strides(0) / static_cast<ssize_t>(sizeof(Scalar));
+
+        if (vector) { // Eigen type is a compile-time vector
+            if (fixed && size != n)
+                return false; // Vector size mismatch
+            return {rows == 1 ? 1 : n, cols == 1 ? 1 : n, stride};
+        }
+        else if (fixed) {
+            // The type has a fixed size, but is not a vector: abort
+            return false;
+        }
+        else if (fixed_cols) {
+            // Since this isn't a vector, cols must be != 1.  We allow this only if it exactly
+            // equals the number of elements (rows is Dynamic, and so 1 row is allowed).
+            if (cols != n) return false;
+            return {1, n, stride};
+        }
+        else {
+            // Otherwise it's either fully dynamic, or column dynamic; both become a column vector
+            if (fixed_rows && rows != n) return false;
+            return {n, 1, stride};
+        }
+    }
+
+    static constexpr bool show_writeable = is_eigen_dense_map<Type>::value && is_eigen_mutable_map<Type>::value;
+    static constexpr bool show_order = is_eigen_dense_map<Type>::value;
+    static constexpr bool show_c_contiguous = show_order && requires_row_major;
+    static constexpr bool show_f_contiguous = !show_c_contiguous && show_order && requires_col_major;
+
+    static constexpr auto descriptor =
+        _("numpy.ndarray[") + npy_format_descriptor<Scalar>::name +
+        _("[")  + _<fixed_rows>(_<(size_t) rows>(), _("m")) +
+        _(", ") + _<fixed_cols>(_<(size_t) cols>(), _("n")) +
+        _("]") +
+        // For a reference type (e.g. Ref<MatrixXd>) we have other constraints that might need to be
+        // satisfied: writeable=True (for a mutable reference), and, depending on the map's stride
+        // options, possibly f_contiguous or c_contiguous.  We include them in the descriptor output
+        // to provide some hint as to why a TypeError is occurring (otherwise it can be confusing to
+        // see that a function accepts a 'numpy.ndarray[float64[3,2]]' and an error message that you
+        // *gave* a numpy.ndarray of the right type and dimensions.
+        _<show_writeable>(", flags.writeable", "") +
+        _<show_c_contiguous>(", flags.c_contiguous", "") +
+        _<show_f_contiguous>(", flags.f_contiguous", "") +
+        _("]");
+};
+
+// Casts an Eigen type to numpy array.  If given a base, the numpy array references the src data,
+// otherwise it'll make a copy.  writeable lets you turn off the writeable flag for the array.
+template <typename props> handle eigen_array_cast(typename props::Type const &src, handle base = handle(), bool writeable = true) {
+    constexpr ssize_t elem_size = sizeof(typename props::Scalar);
+    array a;
+    if (props::vector)
+        a = array({ src.size() }, { elem_size * src.innerStride() }, src.data(), base);
+    else
+        a = array({ src.rows(), src.cols() }, { elem_size * src.rowStride(), elem_size * src.colStride() },
+                  src.data(), base);
+
+    if (!writeable)
+        array_proxy(a.ptr())->flags &= ~detail::npy_api::NPY_ARRAY_WRITEABLE_;
+
+    return a.release();
+}
+
+// Takes an lvalue ref to some Eigen type and a (python) base object, creating a numpy array that
+// reference the Eigen object's data with `base` as the python-registered base class (if omitted,
+// the base will be set to None, and lifetime management is up to the caller).  The numpy array is
+// non-writeable if the given type is const.
+template <typename props, typename Type>
+handle eigen_ref_array(Type &src, handle parent = none()) {
+    // none here is to get past array's should-we-copy detection, which currently always
+    // copies when there is no base.  Setting the base to None should be harmless.
+    return eigen_array_cast<props>(src, parent, !std::is_const<Type>::value);
+}
+
+// Takes a pointer to some dense, plain Eigen type, builds a capsule around it, then returns a numpy
+// array that references the encapsulated data with a python-side reference to the capsule to tie
+// its destruction to that of any dependent python objects.  Const-ness is determined by whether or
+// not the Type of the pointer given is const.
+template <typename props, typename Type, typename = enable_if_t<is_eigen_dense_plain<Type>::value>>
+handle eigen_encapsulate(Type *src) {
+    capsule base(src, [](void *o) { delete static_cast<Type *>(o); });
+    return eigen_ref_array<props>(*src, base);
+}
+
+// Type caster for regular, dense matrix types (e.g. MatrixXd), but not maps/refs/etc. of dense
+// types.
+template<typename Type>
+struct type_caster<Type, enable_if_t<is_eigen_dense_plain<Type>::value>> {
+    using Scalar = typename Type::Scalar;
+    using props = EigenProps<Type>;
+
+    bool load(handle src, bool convert) {
+        // If we're in no-convert mode, only load if given an array of the correct type
+        if (!convert && !isinstance<array_t<Scalar>>(src))
+            return false;
+
+        // Coerce into an array, but don't do type conversion yet; the copy below handles it.
+        auto buf = array::ensure(src);
+
+        if (!buf)
+            return false;
+
+        auto dims = buf.ndim();
+        if (dims < 1 || dims > 2)
+            return false;
+
+        auto fits = props::conformable(buf);
+        if (!fits)
+            return false;
+
+        // Allocate the new type, then build a numpy reference into it
+        value = Type(fits.rows, fits.cols);
+        auto ref = reinterpret_steal<array>(eigen_ref_array<props>(value));
+        if (dims == 1) ref = ref.squeeze();
+        else if (ref.ndim() == 1) buf = buf.squeeze();
+
+        int result = detail::npy_api::get().PyArray_CopyInto_(ref.ptr(), buf.ptr());
+
+        if (result < 0) { // Copy failed!
+            PyErr_Clear();
+            return false;
+        }
+
+        return true;
+    }
+
+private:
+
+    // Cast implementation
+    template <typename CType>
+    static handle cast_impl(CType *src, return_value_policy policy, handle parent) {
+        switch (policy) {
+            case return_value_policy::take_ownership:
+            case return_value_policy::automatic:
+                return eigen_encapsulate<props>(src);
+            case return_value_policy::move:
+                return eigen_encapsulate<props>(new CType(std::move(*src)));
+            case return_value_policy::copy:
+                return eigen_array_cast<props>(*src);
+            case return_value_policy::reference:
+            case return_value_policy::automatic_reference:
+                return eigen_ref_array<props>(*src);
+            case return_value_policy::reference_internal:
+                return eigen_ref_array<props>(*src, parent);
+            default:
+                throw cast_error("unhandled return_value_policy: should not happen!");
+        };
+    }
+
+public:
+
+    // Normal returned non-reference, non-const value:
+    static handle cast(Type &&src, return_value_policy /* policy */, handle parent) {
+        return cast_impl(&src, return_value_policy::move, parent);
+    }
+    // If you return a non-reference const, we mark the numpy array readonly:
+    static handle cast(const Type &&src, return_value_policy /* policy */, handle parent) {
+        return cast_impl(&src, return_value_policy::move, parent);
+    }
+    // lvalue reference return; default (automatic) becomes copy
+    static handle cast(Type &src, return_value_policy policy, handle parent) {
+        if (policy == return_value_policy::automatic || policy == return_value_policy::automatic_reference)
+            policy = return_value_policy::copy;
+        return cast_impl(&src, policy, parent);
+    }
+    // const lvalue reference return; default (automatic) becomes copy
+    static handle cast(const Type &src, return_value_policy policy, handle parent) {
+        if (policy == return_value_policy::automatic || policy == return_value_policy::automatic_reference)
+            policy = return_value_policy::copy;
+        return cast(&src, policy, parent);
+    }
+    // non-const pointer return
+    static handle cast(Type *src, return_value_policy policy, handle parent) {
+        return cast_impl(src, policy, parent);
+    }
+    // const pointer return
+    static handle cast(const Type *src, return_value_policy policy, handle parent) {
+        return cast_impl(src, policy, parent);
+    }
+
+    static constexpr auto name = props::descriptor;
+
+    operator Type*() { return &value; }
+    operator Type&() { return value; }
+    operator Type&&() && { return std::move(value); }
+    template <typename T> using cast_op_type = movable_cast_op_type<T>;
+
+private:
+    Type value;
+};
+
+// Base class for casting reference/map/block/etc. objects back to python.
+template <typename MapType> struct eigen_map_caster {
+private:
+    using props = EigenProps<MapType>;
+
+public:
+
+    // Directly referencing a ref/map's data is a bit dangerous (whatever the map/ref points to has
+    // to stay around), but we'll allow it under the assumption that you know what you're doing (and
+    // have an appropriate keep_alive in place).  We return a numpy array pointing directly at the
+    // ref's data (The numpy array ends up read-only if the ref was to a const matrix type.) Note
+    // that this means you need to ensure you don't destroy the object in some other way (e.g. with
+    // an appropriate keep_alive, or with a reference to a statically allocated matrix).
+    static handle cast(const MapType &src, return_value_policy policy, handle parent) {
+        switch (policy) {
+            case return_value_policy::copy:
+                return eigen_array_cast<props>(src);
+            case return_value_policy::reference_internal:
+                return eigen_array_cast<props>(src, parent, is_eigen_mutable_map<MapType>::value);
+            case return_value_policy::reference:
+            case return_value_policy::automatic:
+            case return_value_policy::automatic_reference:
+                return eigen_array_cast<props>(src, none(), is_eigen_mutable_map<MapType>::value);
+            default:
+                // move, take_ownership don't make any sense for a ref/map:
+                pybind11_fail("Invalid return_value_policy for Eigen Map/Ref/Block type");
+        }
+    }
+
+    static constexpr auto name = props::descriptor;
+
+    // Explicitly delete these: support python -> C++ conversion on these (i.e. these can be return
+    // types but not bound arguments).  We still provide them (with an explicitly delete) so that
+    // you end up here if you try anyway.
+    bool load(handle, bool) = delete;
+    operator MapType() = delete;
+    template <typename> using cast_op_type = MapType;
+};
+
+// We can return any map-like object (but can only load Refs, specialized next):
+template <typename Type> struct type_caster<Type, enable_if_t<is_eigen_dense_map<Type>::value>>
+    : eigen_map_caster<Type> {};
+
+// Loader for Ref<...> arguments.  See the documentation for info on how to make this work without
+// copying (it requires some extra effort in many cases).
+template <typename PlainObjectType, typename StrideType>
+struct type_caster<
+    Eigen::Ref<PlainObjectType, 0, StrideType>,
+    enable_if_t<is_eigen_dense_map<Eigen::Ref<PlainObjectType, 0, StrideType>>::value>
+> : public eigen_map_caster<Eigen::Ref<PlainObjectType, 0, StrideType>> {
+private:
+    using Type = Eigen::Ref<PlainObjectType, 0, StrideType>;
+    using props = EigenProps<Type>;
+    using Scalar = typename props::Scalar;
+    using MapType = Eigen::Map<PlainObjectType, 0, StrideType>;
+    using Array = array_t<Scalar, array::forcecast |
+                ((props::row_major ? props::inner_stride : props::outer_stride) == 1 ? array::c_style :
+                 (props::row_major ? props::outer_stride : props::inner_stride) == 1 ? array::f_style : 0)>;
+    static constexpr bool need_writeable = is_eigen_mutable_map<Type>::value;
+    // Delay construction (these have no default constructor)
+    std::unique_ptr<MapType> map;
+    std::unique_ptr<Type> ref;
+    // Our array.  When possible, this is just a numpy array pointing to the source data, but
+    // sometimes we can't avoid copying (e.g. input is not a numpy array at all, has an incompatible
+    // layout, or is an array of a type that needs to be converted).  Using a numpy temporary
+    // (rather than an Eigen temporary) saves an extra copy when we need both type conversion and
+    // storage order conversion.  (Note that we refuse to use this temporary copy when loading an
+    // argument for a Ref<M> with M non-const, i.e. a read-write reference).
+    Array copy_or_ref;
+public:
+    bool load(handle src, bool convert) {
+        // First check whether what we have is already an array of the right type.  If not, we can't
+        // avoid a copy (because the copy is also going to do type conversion).
+        bool need_copy = !isinstance<Array>(src);
+
+        EigenConformable<props::row_major> fits;
+        if (!need_copy) {
+            // We don't need a converting copy, but we also need to check whether the strides are
+            // compatible with the Ref's stride requirements
+            Array aref = reinterpret_borrow<Array>(src);
+
+            if (aref && (!need_writeable || aref.writeable())) {
+                fits = props::conformable(aref);
+                if (!fits) return false; // Incompatible dimensions
+                if (!fits.template stride_compatible<props>())
+                    need_copy = true;
+                else
+                    copy_or_ref = std::move(aref);
+            }
+            else {
+                need_copy = true;
+            }
+        }
+
+        if (need_copy) {
+            // We need to copy: If we need a mutable reference, or we're not supposed to convert
+            // (either because we're in the no-convert overload pass, or because we're explicitly
+            // instructed not to copy (via `py::arg().noconvert()`) we have to fail loading.
+            if (!convert || need_writeable) return false;
+
+            Array copy = Array::ensure(src);
+            if (!copy) return false;
+            fits = props::conformable(copy);
+            if (!fits || !fits.template stride_compatible<props>())
+                return false;
+            copy_or_ref = std::move(copy);
+            loader_life_support::add_patient(copy_or_ref);
+        }
+
+        ref.reset();
+        map.reset(new MapType(data(copy_or_ref), fits.rows, fits.cols, make_stride(fits.stride.outer(), fits.stride.inner())));
+        ref.reset(new Type(*map));
+
+        return true;
+    }
+
+    operator Type*() { return ref.get(); }
+    operator Type&() { return *ref; }
+    template <typename _T> using cast_op_type = pybind11::detail::cast_op_type<_T>;
+
+private:
+    template <typename T = Type, enable_if_t<is_eigen_mutable_map<T>::value, int> = 0>
+    Scalar *data(Array &a) { return a.mutable_data(); }
+
+    template <typename T = Type, enable_if_t<!is_eigen_mutable_map<T>::value, int> = 0>
+    const Scalar *data(Array &a) { return a.data(); }
+
+    // Attempt to figure out a constructor of `Stride` that will work.
+    // If both strides are fixed, use a default constructor:
+    template <typename S> using stride_ctor_default = bool_constant<
+        S::InnerStrideAtCompileTime != Eigen::Dynamic && S::OuterStrideAtCompileTime != Eigen::Dynamic &&
+        std::is_default_constructible<S>::value>;
+    // Otherwise, if there is a two-index constructor, assume it is (outer,inner) like
+    // Eigen::Stride, and use it:
+    template <typename S> using stride_ctor_dual = bool_constant<
+        !stride_ctor_default<S>::value && std::is_constructible<S, EigenIndex, EigenIndex>::value>;
+    // Otherwise, if there is a one-index constructor, and just one of the strides is dynamic, use
+    // it (passing whichever stride is dynamic).
+    template <typename S> using stride_ctor_outer = bool_constant<
+        !any_of<stride_ctor_default<S>, stride_ctor_dual<S>>::value &&
+        S::OuterStrideAtCompileTime == Eigen::Dynamic && S::InnerStrideAtCompileTime != Eigen::Dynamic &&
+        std::is_constructible<S, EigenIndex>::value>;
+    template <typename S> using stride_ctor_inner = bool_constant<
+        !any_of<stride_ctor_default<S>, stride_ctor_dual<S>>::value &&
+        S::InnerStrideAtCompileTime == Eigen::Dynamic && S::OuterStrideAtCompileTime != Eigen::Dynamic &&
+        std::is_constructible<S, EigenIndex>::value>;
+
+    template <typename S = StrideType, enable_if_t<stride_ctor_default<S>::value, int> = 0>
+    static S make_stride(EigenIndex, EigenIndex) { return S(); }
+    template <typename S = StrideType, enable_if_t<stride_ctor_dual<S>::value, int> = 0>
+    static S make_stride(EigenIndex outer, EigenIndex inner) { return S(outer, inner); }
+    template <typename S = StrideType, enable_if_t<stride_ctor_outer<S>::value, int> = 0>
+    static S make_stride(EigenIndex outer, EigenIndex) { return S(outer); }
+    template <typename S = StrideType, enable_if_t<stride_ctor_inner<S>::value, int> = 0>
+    static S make_stride(EigenIndex, EigenIndex inner) { return S(inner); }
+
+};
+
+// type_caster for special matrix types (e.g. DiagonalMatrix), which are EigenBase, but not
+// EigenDense (i.e. they don't have a data(), at least not with the usual matrix layout).
+// load() is not supported, but we can cast them into the python domain by first copying to a
+// regular Eigen::Matrix, then casting that.
+template <typename Type>
+struct type_caster<Type, enable_if_t<is_eigen_other<Type>::value>> {
+protected:
+    using Matrix = Eigen::Matrix<typename Type::Scalar, Type::RowsAtCompileTime, Type::ColsAtCompileTime>;
+    using props = EigenProps<Matrix>;
+public:
+    static handle cast(const Type &src, return_value_policy /* policy */, handle /* parent */) {
+        handle h = eigen_encapsulate<props>(new Matrix(src));
+        return h;
+    }
+    static handle cast(const Type *src, return_value_policy policy, handle parent) { return cast(*src, policy, parent); }
+
+    static constexpr auto name = props::descriptor;
+
+    // Explicitly delete these: support python -> C++ conversion on these (i.e. these can be return
+    // types but not bound arguments).  We still provide them (with an explicitly delete) so that
+    // you end up here if you try anyway.
+    bool load(handle, bool) = delete;
+    operator Type() = delete;
+    template <typename> using cast_op_type = Type;
+};
+
+template<typename Type>
+struct type_caster<Type, enable_if_t<is_eigen_sparse<Type>::value>> {
+    typedef typename Type::Scalar Scalar;
+    typedef remove_reference_t<decltype(*std::declval<Type>().outerIndexPtr())> StorageIndex;
+    typedef typename Type::Index Index;
+    static constexpr bool rowMajor = Type::IsRowMajor;
+
+    bool load(handle src, bool) {
+        if (!src)
+            return false;
+
+        auto obj = reinterpret_borrow<object>(src);
+        object sparse_module = module::import("scipy.sparse");
+        object matrix_type = sparse_module.attr(
+            rowMajor ? "csr_matrix" : "csc_matrix");
+
+        if (!obj.get_type().is(matrix_type)) {
+            try {
+                obj = matrix_type(obj);
+            } catch (const error_already_set &) {
+                return false;
+            }
+        }
+
+        auto values = array_t<Scalar>((object) obj.attr("data"));
+        auto innerIndices = array_t<StorageIndex>((object) obj.attr("indices"));
+        auto outerIndices = array_t<StorageIndex>((object) obj.attr("indptr"));
+        auto shape = pybind11::tuple((pybind11::object) obj.attr("shape"));
+        auto nnz = obj.attr("nnz").cast<Index>();
+
+        if (!values || !innerIndices || !outerIndices)
+            return false;
+
+        value = Eigen::MappedSparseMatrix<Scalar, Type::Flags, StorageIndex>(
+            shape[0].cast<Index>(), shape[1].cast<Index>(), nnz,
+            outerIndices.mutable_data(), innerIndices.mutable_data(), values.mutable_data());
+
+        return true;
+    }
+
+    static handle cast(const Type &src, return_value_policy /* policy */, handle /* parent */) {
+        const_cast<Type&>(src).makeCompressed();
+
+        object matrix_type = module::import("scipy.sparse").attr(
+            rowMajor ? "csr_matrix" : "csc_matrix");
+
+        array data(src.nonZeros(), src.valuePtr());
+        array outerIndices((rowMajor ? src.rows() : src.cols()) + 1, src.outerIndexPtr());
+        array innerIndices(src.nonZeros(), src.innerIndexPtr());
+
+        return matrix_type(
+            std::make_tuple(data, innerIndices, outerIndices),
+            std::make_pair(src.rows(), src.cols())
+        ).release();
+    }
+
+    PYBIND11_TYPE_CASTER(Type, _<(Type::IsRowMajor) != 0>("scipy.sparse.csr_matrix[", "scipy.sparse.csc_matrix[")
+            + npy_format_descriptor<Scalar>::name + _("]"));
+};
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
+
+#if defined(__GNUG__) || defined(__clang__)
+#  pragma GCC diagnostic pop
+#elif defined(_MSC_VER)
+#  pragma warning(pop)
+#endif
diff --git a/3rdparty/pybind11/include/pybind11/embed.h b/3rdparty/pybind11/include/pybind11/embed.h
new file mode 100644
index 00000000..f814c783
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/embed.h
@@ -0,0 +1,202 @@
+/*
+    pybind11/embed.h: Support for embedding the interpreter
+
+    Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+#include "eval.h"
+
+#if defined(PYPY_VERSION)
+#  error Embedding the interpreter is not supported with PyPy
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+#  define PYBIND11_EMBEDDED_MODULE_IMPL(name)            \
+      extern "C" PyObject *pybind11_init_impl_##name();  \
+      extern "C" PyObject *pybind11_init_impl_##name() { \
+          return pybind11_init_wrapper_##name();         \
+      }
+#else
+#  define PYBIND11_EMBEDDED_MODULE_IMPL(name)            \
+      extern "C" void pybind11_init_impl_##name();       \
+      extern "C" void pybind11_init_impl_##name() {      \
+          pybind11_init_wrapper_##name();                \
+      }
+#endif
+
+/** \rst
+    Add a new module to the table of builtins for the interpreter. Must be
+    defined in global scope. The first macro parameter is the name of the
+    module (without quotes). The second parameter is the variable which will
+    be used as the interface to add functions and classes to the module.
+
+    .. code-block:: cpp
+
+        PYBIND11_EMBEDDED_MODULE(example, m) {
+            // ... initialize functions and classes here
+            m.def("foo", []() {
+                return "Hello, World!";
+            });
+        }
+ \endrst */
+#define PYBIND11_EMBEDDED_MODULE(name, variable)                              \
+    static void PYBIND11_CONCAT(pybind11_init_, name)(pybind11::module &);    \
+    static PyObject PYBIND11_CONCAT(*pybind11_init_wrapper_, name)() {        \
+        auto m = pybind11::module(PYBIND11_TOSTRING(name));                   \
+        try {                                                                 \
+            PYBIND11_CONCAT(pybind11_init_, name)(m);                         \
+            return m.ptr();                                                   \
+        } catch (pybind11::error_already_set &e) {                            \
+            PyErr_SetString(PyExc_ImportError, e.what());                     \
+            return nullptr;                                                   \
+        } catch (const std::exception &e) {                                   \
+            PyErr_SetString(PyExc_ImportError, e.what());                     \
+            return nullptr;                                                   \
+        }                                                                     \
+    }                                                                         \
+    PYBIND11_EMBEDDED_MODULE_IMPL(name)                                       \
+    pybind11::detail::embedded_module name(PYBIND11_TOSTRING(name),           \
+                               PYBIND11_CONCAT(pybind11_init_impl_, name));   \
+    void PYBIND11_CONCAT(pybind11_init_, name)(pybind11::module &variable)
+
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+/// Python 2.7/3.x compatible version of `PyImport_AppendInittab` and error checks.
+struct embedded_module {
+#if PY_MAJOR_VERSION >= 3
+    using init_t = PyObject *(*)();
+#else
+    using init_t = void (*)();
+#endif
+    embedded_module(const char *name, init_t init) {
+        if (Py_IsInitialized())
+            pybind11_fail("Can't add new modules after the interpreter has been initialized");
+
+        auto result = PyImport_AppendInittab(name, init);
+        if (result == -1)
+            pybind11_fail("Insufficient memory to add a new module");
+    }
+};
+
+NAMESPACE_END(detail)
+
+/** \rst
+    Initialize the Python interpreter. No other pybind11 or CPython API functions can be
+    called before this is done; with the exception of `PYBIND11_EMBEDDED_MODULE`. The
+    optional parameter can be used to skip the registration of signal handlers (see the
+    `Python documentation`_ for details). Calling this function again after the interpreter
+    has already been initialized is a fatal error.
+
+    If initializing the Python interpreter fails, then the program is terminated.  (This
+    is controlled by the CPython runtime and is an exception to pybind11's normal behavior
+    of throwing exceptions on errors.)
+
+    .. _Python documentation: https://docs.python.org/3/c-api/init.html#c.Py_InitializeEx
+ \endrst */
+inline void initialize_interpreter(bool init_signal_handlers = true) {
+    if (Py_IsInitialized())
+        pybind11_fail("The interpreter is already running");
+
+    Py_InitializeEx(init_signal_handlers ? 1 : 0);
+
+    // Make .py files in the working directory available by default
+    module::import("sys").attr("path").cast<list>().append(".");
+}
+
+/** \rst
+    Shut down the Python interpreter. No pybind11 or CPython API functions can be called
+    after this. In addition, pybind11 objects must not outlive the interpreter:
+
+    .. code-block:: cpp
+
+        { // BAD
+            py::initialize_interpreter();
+            auto hello = py::str("Hello, World!");
+            py::finalize_interpreter();
+        } // <-- BOOM, hello's destructor is called after interpreter shutdown
+
+        { // GOOD
+            py::initialize_interpreter();
+            { // scoped
+                auto hello = py::str("Hello, World!");
+            } // <-- OK, hello is cleaned up properly
+            py::finalize_interpreter();
+        }
+
+        { // BETTER
+            py::scoped_interpreter guard{};
+            auto hello = py::str("Hello, World!");
+        }
+
+    .. warning::
+
+        The interpreter can be restarted by calling `initialize_interpreter` again.
+        Modules created using pybind11 can be safely re-initialized. However, Python
+        itself cannot completely unload binary extension modules and there are several
+        caveats with regard to interpreter restarting. All the details can be found
+        in the CPython documentation. In short, not all interpreter memory may be
+        freed, either due to reference cycles or user-created global data.
+
+ \endrst */
+inline void finalize_interpreter() {
+    handle builtins(PyEval_GetBuiltins());
+    const char *id = PYBIND11_INTERNALS_ID;
+
+    // Get the internals pointer (without creating it if it doesn't exist).  It's possible for the
+    // internals to be created during Py_Finalize() (e.g. if a py::capsule calls `get_internals()`
+    // during destruction), so we get the pointer-pointer here and check it after Py_Finalize().
+    detail::internals **internals_ptr_ptr = detail::get_internals_pp();
+    // It could also be stashed in builtins, so look there too:
+    if (builtins.contains(id) && isinstance<capsule>(builtins[id]))
+        internals_ptr_ptr = capsule(builtins[id]);
+
+    Py_Finalize();
+
+    if (internals_ptr_ptr) {
+        delete *internals_ptr_ptr;
+        *internals_ptr_ptr = nullptr;
+    }
+}
+
+/** \rst
+    Scope guard version of `initialize_interpreter` and `finalize_interpreter`.
+    This a move-only guard and only a single instance can exist.
+
+    .. code-block:: cpp
+
+        #include <pybind11/embed.h>
+
+        int main() {
+            py::scoped_interpreter guard{};
+            py::print(Hello, World!);
+        } // <-- interpreter shutdown
+ \endrst */
+class scoped_interpreter {
+public:
+    scoped_interpreter(bool init_signal_handlers = true) {
+        initialize_interpreter(init_signal_handlers);
+    }
+
+    scoped_interpreter(const scoped_interpreter &) = delete;
+    scoped_interpreter(scoped_interpreter &&other) noexcept { other.is_valid = false; }
+    scoped_interpreter &operator=(const scoped_interpreter &) = delete;
+    scoped_interpreter &operator=(scoped_interpreter &&) = delete;
+
+    ~scoped_interpreter() {
+        if (is_valid)
+            finalize_interpreter();
+    }
+
+private:
+    bool is_valid = true;
+};
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/eval.h b/3rdparty/pybind11/include/pybind11/eval.h
new file mode 100644
index 00000000..ea85ba1d
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/eval.h
@@ -0,0 +1,117 @@
+/*
+    pybind11/exec.h: Support for evaluating Python expressions and statements
+    from strings and files
+
+    Copyright (c) 2016 Klemens Morgenstern <klemens.morgenstern@ed-chemnitz.de> and
+                       Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+enum eval_mode {
+    /// Evaluate a string containing an isolated expression
+    eval_expr,
+
+    /// Evaluate a string containing a single statement. Returns \c none
+    eval_single_statement,
+
+    /// Evaluate a string containing a sequence of statement. Returns \c none
+    eval_statements
+};
+
+template <eval_mode mode = eval_expr>
+object eval(str expr, object global = globals(), object local = object()) {
+    if (!local)
+        local = global;
+
+    /* PyRun_String does not accept a PyObject / encoding specifier,
+       this seems to be the only alternative */
+    std::string buffer = "# -*- coding: utf-8 -*-\n" + (std::string) expr;
+
+    int start;
+    switch (mode) {
+        case eval_expr:             start = Py_eval_input;   break;
+        case eval_single_statement: start = Py_single_input; break;
+        case eval_statements:       start = Py_file_input;   break;
+        default: pybind11_fail("invalid evaluation mode");
+    }
+
+    PyObject *result = PyRun_String(buffer.c_str(), start, global.ptr(), local.ptr());
+    if (!result)
+        throw error_already_set();
+    return reinterpret_steal<object>(result);
+}
+
+template <eval_mode mode = eval_expr, size_t N>
+object eval(const char (&s)[N], object global = globals(), object local = object()) {
+    /* Support raw string literals by removing common leading whitespace */
+    auto expr = (s[0] == '\n') ? str(module::import("textwrap").attr("dedent")(s))
+                               : str(s);
+    return eval<mode>(expr, global, local);
+}
+
+inline void exec(str expr, object global = globals(), object local = object()) {
+    eval<eval_statements>(expr, global, local);
+}
+
+template <size_t N>
+void exec(const char (&s)[N], object global = globals(), object local = object()) {
+    eval<eval_statements>(s, global, local);
+}
+
+template <eval_mode mode = eval_statements>
+object eval_file(str fname, object global = globals(), object local = object()) {
+    if (!local)
+        local = global;
+
+    int start;
+    switch (mode) {
+        case eval_expr:             start = Py_eval_input;   break;
+        case eval_single_statement: start = Py_single_input; break;
+        case eval_statements:       start = Py_file_input;   break;
+        default: pybind11_fail("invalid evaluation mode");
+    }
+
+    int closeFile = 1;
+    std::string fname_str = (std::string) fname;
+#if PY_VERSION_HEX >= 0x03040000
+    FILE *f = _Py_fopen_obj(fname.ptr(), "r");
+#elif PY_VERSION_HEX >= 0x03000000
+    FILE *f = _Py_fopen(fname.ptr(), "r");
+#else
+    /* No unicode support in open() :( */
+    auto fobj = reinterpret_steal<object>(PyFile_FromString(
+        const_cast<char *>(fname_str.c_str()),
+        const_cast<char*>("r")));
+    FILE *f = nullptr;
+    if (fobj)
+        f = PyFile_AsFile(fobj.ptr());
+    closeFile = 0;
+#endif
+    if (!f) {
+        PyErr_Clear();
+        pybind11_fail("File \"" + fname_str + "\" could not be opened!");
+    }
+
+#if PY_VERSION_HEX < 0x03000000 && defined(PYPY_VERSION)
+    PyObject *result = PyRun_File(f, fname_str.c_str(), start, global.ptr(),
+                                  local.ptr());
+    (void) closeFile;
+#else
+    PyObject *result = PyRun_FileEx(f, fname_str.c_str(), start, global.ptr(),
+                                    local.ptr(), closeFile);
+#endif
+
+    if (!result)
+        throw error_already_set();
+    return reinterpret_steal<object>(result);
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/functional.h b/3rdparty/pybind11/include/pybind11/functional.h
new file mode 100644
index 00000000..f8bda648
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/functional.h
@@ -0,0 +1,101 @@
+/*
+    pybind11/functional.h: std::function<> support
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+#include <functional>
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+template <typename Return, typename... Args>
+struct type_caster<std::function<Return(Args...)>> {
+    using type = std::function<Return(Args...)>;
+    using retval_type = conditional_t<std::is_same<Return, void>::value, void_type, Return>;
+    using function_type = Return (*) (Args...);
+
+public:
+    bool load(handle src, bool convert) {
+        if (src.is_none()) {
+            // Defer accepting None to other overloads (if we aren't in convert mode):
+            if (!convert) return false;
+            return true;
+        }
+
+        if (!isinstance<function>(src))
+            return false;
+
+        auto func = reinterpret_borrow<function>(src);
+
+        /*
+           When passing a C++ function as an argument to another C++
+           function via Python, every function call would normally involve
+           a full C++ -> Python -> C++ roundtrip, which can be prohibitive.
+           Here, we try to at least detect the case where the function is
+           stateless (i.e. function pointer or lambda function without
+           captured variables), in which case the roundtrip can be avoided.
+         */
+        if (auto cfunc = func.cpp_function()) {
+            auto c = reinterpret_borrow<capsule>(PyCFunction_GET_SELF(cfunc.ptr()));
+            auto rec = (function_record *) c;
+
+            if (rec && rec->is_stateless &&
+                    same_type(typeid(function_type), *reinterpret_cast<const std::type_info *>(rec->data[1]))) {
+                struct capture { function_type f; };
+                value = ((capture *) &rec->data)->f;
+                return true;
+            }
+        }
+
+        // ensure GIL is held during functor destruction
+        struct func_handle {
+            function f;
+            func_handle(function&& f_) : f(std::move(f_)) {}
+            func_handle(const func_handle&) = default;
+            ~func_handle() {
+                gil_scoped_acquire acq;
+                function kill_f(std::move(f));
+            }
+        };
+
+        // to emulate 'move initialization capture' in C++11
+        struct func_wrapper {
+            func_handle hfunc;
+            func_wrapper(func_handle&& hf): hfunc(std::move(hf)) {}
+            Return operator()(Args... args) const {
+                gil_scoped_acquire acq;
+                object retval(hfunc.f(std::forward<Args>(args)...));
+                /* Visual studio 2015 parser issue: need parentheses around this expression */
+                return (retval.template cast<Return>());
+            }
+        };
+
+        value = func_wrapper(func_handle(std::move(func)));
+        return true;
+    }
+
+    template <typename Func>
+    static handle cast(Func &&f_, return_value_policy policy, handle /* parent */) {
+        if (!f_)
+            return none().inc_ref();
+
+        auto result = f_.template target<function_type>();
+        if (result)
+            return cpp_function(*result, policy).release();
+        else
+            return cpp_function(std::forward<Func>(f_), policy).release();
+    }
+
+    PYBIND11_TYPE_CASTER(type, _("Callable[[") + concat(make_caster<Args>::name...) + _("], ")
+                               + make_caster<retval_type>::name + _("]"));
+};
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/iostream.h b/3rdparty/pybind11/include/pybind11/iostream.h
new file mode 100644
index 00000000..c43b7c93
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/iostream.h
@@ -0,0 +1,209 @@
+/*
+    pybind11/iostream.h -- Tools to assist with redirecting cout and cerr to Python
+
+    Copyright (c) 2017 Henry F. Schreiner
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+
+#include <streambuf>
+#include <ostream>
+#include <string>
+#include <memory>
+#include <iostream>
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+// Buffer that writes to Python instead of C++
+class pythonbuf : public std::streambuf {
+private:
+    using traits_type = std::streambuf::traits_type;
+
+    const size_t buf_size;
+    std::unique_ptr<char[]> d_buffer;
+    object pywrite;
+    object pyflush;
+
+    int overflow(int c) {
+        if (!traits_type::eq_int_type(c, traits_type::eof())) {
+            *pptr() = traits_type::to_char_type(c);
+            pbump(1);
+        }
+        return sync() == 0 ? traits_type::not_eof(c) : traits_type::eof();
+    }
+
+    int sync() {
+        if (pbase() != pptr()) {
+            // This subtraction cannot be negative, so dropping the sign
+            str line(pbase(), static_cast<size_t>(pptr() - pbase()));
+
+            {
+                gil_scoped_acquire tmp;
+                pywrite(line);
+                pyflush();
+            }
+
+            setp(pbase(), epptr());
+        }
+        return 0;
+    }
+
+public:
+
+    pythonbuf(object pyostream, size_t buffer_size = 1024)
+        : buf_size(buffer_size),
+          d_buffer(new char[buf_size]),
+          pywrite(pyostream.attr("write")),
+          pyflush(pyostream.attr("flush")) {
+        setp(d_buffer.get(), d_buffer.get() + buf_size - 1);
+    }
+
+    pythonbuf(pythonbuf&&) = default;
+
+    /// Sync before destroy
+    ~pythonbuf() {
+        sync();
+    }
+};
+
+NAMESPACE_END(detail)
+
+
+/** \rst
+    This a move-only guard that redirects output.
+
+    .. code-block:: cpp
+
+        #include <pybind11/iostream.h>
+
+        ...
+
+        {
+            py::scoped_ostream_redirect output;
+            std::cout << "Hello, World!"; // Python stdout
+        } // <-- return std::cout to normal
+
+    You can explicitly pass the c++ stream and the python object,
+    for example to guard stderr instead.
+
+    .. code-block:: cpp
+
+        {
+            py::scoped_ostream_redirect output{std::cerr, py::module::import("sys").attr("stderr")};
+            std::cerr << "Hello, World!";
+        }
+ \endrst */
+class scoped_ostream_redirect {
+protected:
+    std::streambuf *old;
+    std::ostream &costream;
+    detail::pythonbuf buffer;
+
+public:
+    scoped_ostream_redirect(
+            std::ostream &costream = std::cout,
+            object pyostream = module::import("sys").attr("stdout"))
+        : costream(costream), buffer(pyostream) {
+        old = costream.rdbuf(&buffer);
+    }
+
+    ~scoped_ostream_redirect() {
+        costream.rdbuf(old);
+    }
+
+    scoped_ostream_redirect(const scoped_ostream_redirect &) = delete;
+    scoped_ostream_redirect(scoped_ostream_redirect &&other) = default;
+    scoped_ostream_redirect &operator=(const scoped_ostream_redirect &) = delete;
+    scoped_ostream_redirect &operator=(scoped_ostream_redirect &&) = delete;
+};
+
+
+/** \rst
+    Like `scoped_ostream_redirect`, but redirects cerr by default. This class
+    is provided primary to make ``py::call_guard`` easier to make.
+
+    .. code-block:: cpp
+
+     m.def("noisy_func", &noisy_func,
+           py::call_guard<scoped_ostream_redirect,
+                          scoped_estream_redirect>());
+
+\endrst */
+class scoped_estream_redirect : public scoped_ostream_redirect {
+public:
+    scoped_estream_redirect(
+            std::ostream &costream = std::cerr,
+            object pyostream = module::import("sys").attr("stderr"))
+        : scoped_ostream_redirect(costream,pyostream) {}
+};
+
+
+NAMESPACE_BEGIN(detail)
+
+// Class to redirect output as a context manager. C++ backend.
+class OstreamRedirect {
+    bool do_stdout_;
+    bool do_stderr_;
+    std::unique_ptr<scoped_ostream_redirect> redirect_stdout;
+    std::unique_ptr<scoped_estream_redirect> redirect_stderr;
+
+public:
+    OstreamRedirect(bool do_stdout = true, bool do_stderr = true)
+        : do_stdout_(do_stdout), do_stderr_(do_stderr) {}
+
+    void enter() {
+        if (do_stdout_)
+            redirect_stdout.reset(new scoped_ostream_redirect());
+        if (do_stderr_)
+            redirect_stderr.reset(new scoped_estream_redirect());
+    }
+
+    void exit() {
+        redirect_stdout.reset();
+        redirect_stderr.reset();
+    }
+};
+
+NAMESPACE_END(detail)
+
+/** \rst
+    This is a helper function to add a C++ redirect context manager to Python
+    instead of using a C++ guard. To use it, add the following to your binding code:
+
+    .. code-block:: cpp
+
+        #include <pybind11/iostream.h>
+
+        ...
+
+        py::add_ostream_redirect(m, "ostream_redirect");
+
+    You now have a Python context manager that redirects your output:
+
+    .. code-block:: python
+
+        with m.ostream_redirect():
+            m.print_to_cout_function()
+
+    This manager can optionally be told which streams to operate on:
+
+    .. code-block:: python
+
+        with m.ostream_redirect(stdout=true, stderr=true):
+            m.noisy_function_with_error_printing()
+
+ \endrst */
+inline class_<detail::OstreamRedirect> add_ostream_redirect(module m, std::string name = "ostream_redirect") {
+    return class_<detail::OstreamRedirect>(m, name.c_str(), module_local())
+        .def(init<bool,bool>(), arg("stdout")=true, arg("stderr")=true)
+        .def("__enter__", &detail::OstreamRedirect::enter)
+        .def("__exit__", [](detail::OstreamRedirect &self_, args) { self_.exit(); });
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/numpy.h b/3rdparty/pybind11/include/pybind11/numpy.h
new file mode 100644
index 00000000..ba41a223
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/numpy.h
@@ -0,0 +1,1642 @@
+/*
+    pybind11/numpy.h: Basic NumPy support, vectorize() wrapper
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+#include "complex.h"
+#include <numeric>
+#include <algorithm>
+#include <array>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <sstream>
+#include <string>
+#include <functional>
+#include <utility>
+#include <vector>
+#include <typeindex>
+
+#if defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#endif
+
+/* This will be true on all flat address space platforms and allows us to reduce the
+   whole npy_intp / ssize_t / Py_intptr_t business down to just ssize_t for all size
+   and dimension types (e.g. shape, strides, indexing), instead of inflicting this
+   upon the library user. */
+static_assert(sizeof(ssize_t) == sizeof(Py_intptr_t), "ssize_t != Py_intptr_t");
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+class array; // Forward declaration
+
+NAMESPACE_BEGIN(detail)
+template <typename type, typename SFINAE = void> struct npy_format_descriptor;
+
+struct PyArrayDescr_Proxy {
+    PyObject_HEAD
+    PyObject *typeobj;
+    char kind;
+    char type;
+    char byteorder;
+    char flags;
+    int type_num;
+    int elsize;
+    int alignment;
+    char *subarray;
+    PyObject *fields;
+    PyObject *names;
+};
+
+struct PyArray_Proxy {
+    PyObject_HEAD
+    char *data;
+    int nd;
+    ssize_t *dimensions;
+    ssize_t *strides;
+    PyObject *base;
+    PyObject *descr;
+    int flags;
+};
+
+struct PyVoidScalarObject_Proxy {
+    PyObject_VAR_HEAD
+    char *obval;
+    PyArrayDescr_Proxy *descr;
+    int flags;
+    PyObject *base;
+};
+
+struct numpy_type_info {
+    PyObject* dtype_ptr;
+    std::string format_str;
+};
+
+struct numpy_internals {
+    std::unordered_map<std::type_index, numpy_type_info> registered_dtypes;
+
+    numpy_type_info *get_type_info(const std::type_info& tinfo, bool throw_if_missing = true) {
+        auto it = registered_dtypes.find(std::type_index(tinfo));
+        if (it != registered_dtypes.end())
+            return &(it->second);
+        if (throw_if_missing)
+            pybind11_fail(std::string("NumPy type info missing for ") + tinfo.name());
+        return nullptr;
+    }
+
+    template<typename T> numpy_type_info *get_type_info(bool throw_if_missing = true) {
+        return get_type_info(typeid(typename std::remove_cv<T>::type), throw_if_missing);
+    }
+};
+
+inline PYBIND11_NOINLINE void load_numpy_internals(numpy_internals* &ptr) {
+    ptr = &get_or_create_shared_data<numpy_internals>("_numpy_internals");
+}
+
+inline numpy_internals& get_numpy_internals() {
+    static numpy_internals* ptr = nullptr;
+    if (!ptr)
+        load_numpy_internals(ptr);
+    return *ptr;
+}
+
+template <typename T> struct same_size {
+    template <typename U> using as = bool_constant<sizeof(T) == sizeof(U)>;
+};
+
+template <typename Concrete> constexpr int platform_lookup() { return -1; }
+
+// Lookup a type according to its size, and return a value corresponding to the NumPy typenum.
+template <typename Concrete, typename T, typename... Ts, typename... Ints>
+constexpr int platform_lookup(int I, Ints... Is) {
+    return sizeof(Concrete) == sizeof(T) ? I : platform_lookup<Concrete, Ts...>(Is...);
+}
+
+struct npy_api {
+    enum constants {
+        NPY_ARRAY_C_CONTIGUOUS_ = 0x0001,
+        NPY_ARRAY_F_CONTIGUOUS_ = 0x0002,
+        NPY_ARRAY_OWNDATA_ = 0x0004,
+        NPY_ARRAY_FORCECAST_ = 0x0010,
+        NPY_ARRAY_ENSUREARRAY_ = 0x0040,
+        NPY_ARRAY_ALIGNED_ = 0x0100,
+        NPY_ARRAY_WRITEABLE_ = 0x0400,
+        NPY_BOOL_ = 0,
+        NPY_BYTE_, NPY_UBYTE_,
+        NPY_SHORT_, NPY_USHORT_,
+        NPY_INT_, NPY_UINT_,
+        NPY_LONG_, NPY_ULONG_,
+        NPY_LONGLONG_, NPY_ULONGLONG_,
+        NPY_FLOAT_, NPY_DOUBLE_, NPY_LONGDOUBLE_,
+        NPY_CFLOAT_, NPY_CDOUBLE_, NPY_CLONGDOUBLE_,
+        NPY_OBJECT_ = 17,
+        NPY_STRING_, NPY_UNICODE_, NPY_VOID_,
+        // Platform-dependent normalization
+        NPY_INT8_ = NPY_BYTE_,
+        NPY_UINT8_ = NPY_UBYTE_,
+        NPY_INT16_ = NPY_SHORT_,
+        NPY_UINT16_ = NPY_USHORT_,
+        // `npy_common.h` defines the integer aliases. In order, it checks:
+        // NPY_BITSOF_LONG, NPY_BITSOF_LONGLONG, NPY_BITSOF_INT, NPY_BITSOF_SHORT, NPY_BITSOF_CHAR
+        // and assigns the alias to the first matching size, so we should check in this order.
+        NPY_INT32_ = platform_lookup<std::int32_t, long, int, short>(
+            NPY_LONG_, NPY_INT_, NPY_SHORT_),
+        NPY_UINT32_ = platform_lookup<std::uint32_t, unsigned long, unsigned int, unsigned short>(
+            NPY_ULONG_, NPY_UINT_, NPY_USHORT_),
+        NPY_INT64_ = platform_lookup<std::int64_t, long, long long, int>(
+            NPY_LONG_, NPY_LONGLONG_, NPY_INT_),
+        NPY_UINT64_ = platform_lookup<std::uint64_t, unsigned long, unsigned long long, unsigned int>(
+            NPY_ULONG_, NPY_ULONGLONG_, NPY_UINT_),
+    };
+
+    typedef struct {
+        Py_intptr_t *ptr;
+        int len;
+    } PyArray_Dims;
+
+    static npy_api& get() {
+        static npy_api api = lookup();
+        return api;
+    }
+
+    bool PyArray_Check_(PyObject *obj) const {
+        return (bool) PyObject_TypeCheck(obj, PyArray_Type_);
+    }
+    bool PyArrayDescr_Check_(PyObject *obj) const {
+        return (bool) PyObject_TypeCheck(obj, PyArrayDescr_Type_);
+    }
+
+    unsigned int (*PyArray_GetNDArrayCFeatureVersion_)();
+    PyObject *(*PyArray_DescrFromType_)(int);
+    PyObject *(*PyArray_NewFromDescr_)
+        (PyTypeObject *, PyObject *, int, Py_intptr_t *,
+         Py_intptr_t *, void *, int, PyObject *);
+    PyObject *(*PyArray_DescrNewFromType_)(int);
+    int (*PyArray_CopyInto_)(PyObject *, PyObject *);
+    PyObject *(*PyArray_NewCopy_)(PyObject *, int);
+    PyTypeObject *PyArray_Type_;
+    PyTypeObject *PyVoidArrType_Type_;
+    PyTypeObject *PyArrayDescr_Type_;
+    PyObject *(*PyArray_DescrFromScalar_)(PyObject *);
+    PyObject *(*PyArray_FromAny_) (PyObject *, PyObject *, int, int, int, PyObject *);
+    int (*PyArray_DescrConverter_) (PyObject *, PyObject **);
+    bool (*PyArray_EquivTypes_) (PyObject *, PyObject *);
+    int (*PyArray_GetArrayParamsFromObject_)(PyObject *, PyObject *, char, PyObject **, int *,
+                                             Py_ssize_t *, PyObject **, PyObject *);
+    PyObject *(*PyArray_Squeeze_)(PyObject *);
+    int (*PyArray_SetBaseObject_)(PyObject *, PyObject *);
+    PyObject* (*PyArray_Resize_)(PyObject*, PyArray_Dims*, int, int);
+private:
+    enum functions {
+        API_PyArray_GetNDArrayCFeatureVersion = 211,
+        API_PyArray_Type = 2,
+        API_PyArrayDescr_Type = 3,
+        API_PyVoidArrType_Type = 39,
+        API_PyArray_DescrFromType = 45,
+        API_PyArray_DescrFromScalar = 57,
+        API_PyArray_FromAny = 69,
+        API_PyArray_Resize = 80,
+        API_PyArray_CopyInto = 82,
+        API_PyArray_NewCopy = 85,
+        API_PyArray_NewFromDescr = 94,
+        API_PyArray_DescrNewFromType = 9,
+        API_PyArray_DescrConverter = 174,
+        API_PyArray_EquivTypes = 182,
+        API_PyArray_GetArrayParamsFromObject = 278,
+        API_PyArray_Squeeze = 136,
+        API_PyArray_SetBaseObject = 282
+    };
+
+    static npy_api lookup() {
+        module m = module::import("numpy.core.multiarray");
+        auto c = m.attr("_ARRAY_API");
+#if PY_MAJOR_VERSION >= 3
+        void **api_ptr = (void **) PyCapsule_GetPointer(c.ptr(), NULL);
+#else
+        void **api_ptr = (void **) PyCObject_AsVoidPtr(c.ptr());
+#endif
+        npy_api api;
+#define DECL_NPY_API(Func) api.Func##_ = (decltype(api.Func##_)) api_ptr[API_##Func];
+        DECL_NPY_API(PyArray_GetNDArrayCFeatureVersion);
+        if (api.PyArray_GetNDArrayCFeatureVersion_() < 0x7)
+            pybind11_fail("pybind11 numpy support requires numpy >= 1.7.0");
+        DECL_NPY_API(PyArray_Type);
+        DECL_NPY_API(PyVoidArrType_Type);
+        DECL_NPY_API(PyArrayDescr_Type);
+        DECL_NPY_API(PyArray_DescrFromType);
+        DECL_NPY_API(PyArray_DescrFromScalar);
+        DECL_NPY_API(PyArray_FromAny);
+        DECL_NPY_API(PyArray_Resize);
+        DECL_NPY_API(PyArray_CopyInto);
+        DECL_NPY_API(PyArray_NewCopy);
+        DECL_NPY_API(PyArray_NewFromDescr);
+        DECL_NPY_API(PyArray_DescrNewFromType);
+        DECL_NPY_API(PyArray_DescrConverter);
+        DECL_NPY_API(PyArray_EquivTypes);
+        DECL_NPY_API(PyArray_GetArrayParamsFromObject);
+        DECL_NPY_API(PyArray_Squeeze);
+        DECL_NPY_API(PyArray_SetBaseObject);
+#undef DECL_NPY_API
+        return api;
+    }
+};
+
+inline PyArray_Proxy* array_proxy(void* ptr) {
+    return reinterpret_cast<PyArray_Proxy*>(ptr);
+}
+
+inline const PyArray_Proxy* array_proxy(const void* ptr) {
+    return reinterpret_cast<const PyArray_Proxy*>(ptr);
+}
+
+inline PyArrayDescr_Proxy* array_descriptor_proxy(PyObject* ptr) {
+   return reinterpret_cast<PyArrayDescr_Proxy*>(ptr);
+}
+
+inline const PyArrayDescr_Proxy* array_descriptor_proxy(const PyObject* ptr) {
+   return reinterpret_cast<const PyArrayDescr_Proxy*>(ptr);
+}
+
+inline bool check_flags(const void* ptr, int flag) {
+    return (flag == (array_proxy(ptr)->flags & flag));
+}
+
+template <typename T> struct is_std_array : std::false_type { };
+template <typename T, size_t N> struct is_std_array<std::array<T, N>> : std::true_type { };
+template <typename T> struct is_complex : std::false_type { };
+template <typename T> struct is_complex<std::complex<T>> : std::true_type { };
+
+template <typename T> struct array_info_scalar {
+    typedef T type;
+    static constexpr bool is_array = false;
+    static constexpr bool is_empty = false;
+    static constexpr auto extents = _("");
+    static void append_extents(list& /* shape */) { }
+};
+// Computes underlying type and a comma-separated list of extents for array
+// types (any mix of std::array and built-in arrays). An array of char is
+// treated as scalar because it gets special handling.
+template <typename T> struct array_info : array_info_scalar<T> { };
+template <typename T, size_t N> struct array_info<std::array<T, N>> {
+    using type = typename array_info<T>::type;
+    static constexpr bool is_array = true;
+    static constexpr bool is_empty = (N == 0) || array_info<T>::is_empty;
+    static constexpr size_t extent = N;
+
+    // appends the extents to shape
+    static void append_extents(list& shape) {
+        shape.append(N);
+        array_info<T>::append_extents(shape);
+    }
+
+    static constexpr auto extents = _<array_info<T>::is_array>(
+        concat(_<N>(), array_info<T>::extents), _<N>()
+    );
+};
+// For numpy we have special handling for arrays of characters, so we don't include
+// the size in the array extents.
+template <size_t N> struct array_info<char[N]> : array_info_scalar<char[N]> { };
+template <size_t N> struct array_info<std::array<char, N>> : array_info_scalar<std::array<char, N>> { };
+template <typename T, size_t N> struct array_info<T[N]> : array_info<std::array<T, N>> { };
+template <typename T> using remove_all_extents_t = typename array_info<T>::type;
+
+template <typename T> using is_pod_struct = all_of<
+    std::is_standard_layout<T>,     // since we're accessing directly in memory we need a standard layout type
+#if !defined(__GNUG__) || defined(_LIBCPP_VERSION) || defined(_GLIBCXX_USE_CXX11_ABI)
+    // _GLIBCXX_USE_CXX11_ABI indicates that we're using libstdc++ from GCC 5 or newer, independent
+    // of the actual compiler (Clang can also use libstdc++, but it always defines __GNUC__ == 4).
+    std::is_trivially_copyable<T>,
+#else
+    // GCC 4 doesn't implement is_trivially_copyable, so approximate it
+    std::is_trivially_destructible<T>,
+    satisfies_any_of<T, std::has_trivial_copy_constructor, std::has_trivial_copy_assign>,
+#endif
+    satisfies_none_of<T, std::is_reference, std::is_array, is_std_array, std::is_arithmetic, is_complex, std::is_enum>
+>;
+
+template <ssize_t Dim = 0, typename Strides> ssize_t byte_offset_unsafe(const Strides &) { return 0; }
+template <ssize_t Dim = 0, typename Strides, typename... Ix>
+ssize_t byte_offset_unsafe(const Strides &strides, ssize_t i, Ix... index) {
+    return i * strides[Dim] + byte_offset_unsafe<Dim + 1>(strides, index...);
+}
+
+/**
+ * Proxy class providing unsafe, unchecked const access to array data.  This is constructed through
+ * the `unchecked<T, N>()` method of `array` or the `unchecked<N>()` method of `array_t<T>`.  `Dims`
+ * will be -1 for dimensions determined at runtime.
+ */
+template <typename T, ssize_t Dims>
+class unchecked_reference {
+protected:
+    static constexpr bool Dynamic = Dims < 0;
+    const unsigned char *data_;
+    // Storing the shape & strides in local variables (i.e. these arrays) allows the compiler to
+    // make large performance gains on big, nested loops, but requires compile-time dimensions
+    conditional_t<Dynamic, const ssize_t *, std::array<ssize_t, (size_t) Dims>>
+            shape_, strides_;
+    const ssize_t dims_;
+
+    friend class pybind11::array;
+    // Constructor for compile-time dimensions:
+    template <bool Dyn = Dynamic>
+    unchecked_reference(const void *data, const ssize_t *shape, const ssize_t *strides, enable_if_t<!Dyn, ssize_t>)
+    : data_{reinterpret_cast<const unsigned char *>(data)}, dims_{Dims} {
+        for (size_t i = 0; i < (size_t) dims_; i++) {
+            shape_[i] = shape[i];
+            strides_[i] = strides[i];
+        }
+    }
+    // Constructor for runtime dimensions:
+    template <bool Dyn = Dynamic>
+    unchecked_reference(const void *data, const ssize_t *shape, const ssize_t *strides, enable_if_t<Dyn, ssize_t> dims)
+    : data_{reinterpret_cast<const unsigned char *>(data)}, shape_{shape}, strides_{strides}, dims_{dims} {}
+
+public:
+    /**
+     * Unchecked const reference access to data at the given indices.  For a compile-time known
+     * number of dimensions, this requires the correct number of arguments; for run-time
+     * dimensionality, this is not checked (and so is up to the caller to use safely).
+     */
+    template <typename... Ix> const T &operator()(Ix... index) const {
+        static_assert(ssize_t{sizeof...(Ix)} == Dims || Dynamic,
+                "Invalid number of indices for unchecked array reference");
+        return *reinterpret_cast<const T *>(data_ + byte_offset_unsafe(strides_, ssize_t(index)...));
+    }
+    /**
+     * Unchecked const reference access to data; this operator only participates if the reference
+     * is to a 1-dimensional array.  When present, this is exactly equivalent to `obj(index)`.
+     */
+    template <ssize_t D = Dims, typename = enable_if_t<D == 1 || Dynamic>>
+    const T &operator[](ssize_t index) const { return operator()(index); }
+
+    /// Pointer access to the data at the given indices.
+    template <typename... Ix> const T *data(Ix... ix) const { return &operator()(ssize_t(ix)...); }
+
+    /// Returns the item size, i.e. sizeof(T)
+    constexpr static ssize_t itemsize() { return sizeof(T); }
+
+    /// Returns the shape (i.e. size) of dimension `dim`
+    ssize_t shape(ssize_t dim) const { return shape_[(size_t) dim]; }
+
+    /// Returns the number of dimensions of the array
+    ssize_t ndim() const { return dims_; }
+
+    /// Returns the total number of elements in the referenced array, i.e. the product of the shapes
+    template <bool Dyn = Dynamic>
+    enable_if_t<!Dyn, ssize_t> size() const {
+        return std::accumulate(shape_.begin(), shape_.end(), (ssize_t) 1, std::multiplies<ssize_t>());
+    }
+    template <bool Dyn = Dynamic>
+    enable_if_t<Dyn, ssize_t> size() const {
+        return std::accumulate(shape_, shape_ + ndim(), (ssize_t) 1, std::multiplies<ssize_t>());
+    }
+
+    /// Returns the total number of bytes used by the referenced data.  Note that the actual span in
+    /// memory may be larger if the referenced array has non-contiguous strides (e.g. for a slice).
+    ssize_t nbytes() const {
+        return size() * itemsize();
+    }
+};
+
+template <typename T, ssize_t Dims>
+class unchecked_mutable_reference : public unchecked_reference<T, Dims> {
+    friend class pybind11::array;
+    using ConstBase = unchecked_reference<T, Dims>;
+    using ConstBase::ConstBase;
+    using ConstBase::Dynamic;
+public:
+    /// Mutable, unchecked access to data at the given indices.
+    template <typename... Ix> T& operator()(Ix... index) {
+        static_assert(ssize_t{sizeof...(Ix)} == Dims || Dynamic,
+                "Invalid number of indices for unchecked array reference");
+        return const_cast<T &>(ConstBase::operator()(index...));
+    }
+    /**
+     * Mutable, unchecked access data at the given index; this operator only participates if the
+     * reference is to a 1-dimensional array (or has runtime dimensions).  When present, this is
+     * exactly equivalent to `obj(index)`.
+     */
+    template <ssize_t D = Dims, typename = enable_if_t<D == 1 || Dynamic>>
+    T &operator[](ssize_t index) { return operator()(index); }
+
+    /// Mutable pointer access to the data at the given indices.
+    template <typename... Ix> T *mutable_data(Ix... ix) { return &operator()(ssize_t(ix)...); }
+};
+
+template <typename T, ssize_t Dim>
+struct type_caster<unchecked_reference<T, Dim>> {
+    static_assert(Dim == 0 && Dim > 0 /* always fail */, "unchecked array proxy object is not castable");
+};
+template <typename T, ssize_t Dim>
+struct type_caster<unchecked_mutable_reference<T, Dim>> : type_caster<unchecked_reference<T, Dim>> {};
+
+NAMESPACE_END(detail)
+
+class dtype : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(dtype, object, detail::npy_api::get().PyArrayDescr_Check_);
+
+    explicit dtype(const buffer_info &info) {
+        dtype descr(_dtype_from_pep3118()(PYBIND11_STR_TYPE(info.format)));
+        // If info.itemsize == 0, use the value calculated from the format string
+        m_ptr = descr.strip_padding(info.itemsize ? info.itemsize : descr.itemsize()).release().ptr();
+    }
+
+    explicit dtype(const std::string &format) {
+        m_ptr = from_args(pybind11::str(format)).release().ptr();
+    }
+
+    dtype(const char *format) : dtype(std::string(format)) { }
+
+    dtype(list names, list formats, list offsets, ssize_t itemsize) {
+        dict args;
+        args["names"] = names;
+        args["formats"] = formats;
+        args["offsets"] = offsets;
+        args["itemsize"] = pybind11::int_(itemsize);
+        m_ptr = from_args(args).release().ptr();
+    }
+
+    /// This is essentially the same as calling numpy.dtype(args) in Python.
+    static dtype from_args(object args) {
+        PyObject *ptr = nullptr;
+        if (!detail::npy_api::get().PyArray_DescrConverter_(args.ptr(), &ptr) || !ptr)
+            throw error_already_set();
+        return reinterpret_steal<dtype>(ptr);
+    }
+
+    /// Return dtype associated with a C++ type.
+    template <typename T> static dtype of() {
+        return detail::npy_format_descriptor<typename std::remove_cv<T>::type>::dtype();
+    }
+
+    /// Size of the data type in bytes.
+    ssize_t itemsize() const {
+        return detail::array_descriptor_proxy(m_ptr)->elsize;
+    }
+
+    /// Returns true for structured data types.
+    bool has_fields() const {
+        return detail::array_descriptor_proxy(m_ptr)->names != nullptr;
+    }
+
+    /// Single-character type code.
+    char kind() const {
+        return detail::array_descriptor_proxy(m_ptr)->kind;
+    }
+
+private:
+    static object _dtype_from_pep3118() {
+        static PyObject *obj = module::import("numpy.core._internal")
+            .attr("_dtype_from_pep3118").cast<object>().release().ptr();
+        return reinterpret_borrow<object>(obj);
+    }
+
+    dtype strip_padding(ssize_t itemsize) {
+        // Recursively strip all void fields with empty names that are generated for
+        // padding fields (as of NumPy v1.11).
+        if (!has_fields())
+            return *this;
+
+        struct field_descr { PYBIND11_STR_TYPE name; object format; pybind11::int_ offset; };
+        std::vector<field_descr> field_descriptors;
+
+        for (auto field : attr("fields").attr("items")()) {
+            auto spec = field.cast<tuple>();
+            auto name = spec[0].cast<pybind11::str>();
+            auto format = spec[1].cast<tuple>()[0].cast<dtype>();
+            auto offset = spec[1].cast<tuple>()[1].cast<pybind11::int_>();
+            if (!len(name) && format.kind() == 'V')
+                continue;
+            field_descriptors.push_back({(PYBIND11_STR_TYPE) name, format.strip_padding(format.itemsize()), offset});
+        }
+
+        std::sort(field_descriptors.begin(), field_descriptors.end(),
+                  [](const field_descr& a, const field_descr& b) {
+                      return a.offset.cast<int>() < b.offset.cast<int>();
+                  });
+
+        list names, formats, offsets;
+        for (auto& descr : field_descriptors) {
+            names.append(descr.name);
+            formats.append(descr.format);
+            offsets.append(descr.offset);
+        }
+        return dtype(names, formats, offsets, itemsize);
+    }
+};
+
+class array : public buffer {
+public:
+    PYBIND11_OBJECT_CVT(array, buffer, detail::npy_api::get().PyArray_Check_, raw_array)
+
+    enum {
+        c_style = detail::npy_api::NPY_ARRAY_C_CONTIGUOUS_,
+        f_style = detail::npy_api::NPY_ARRAY_F_CONTIGUOUS_,
+        forcecast = detail::npy_api::NPY_ARRAY_FORCECAST_
+    };
+
+    array() : array({{0}}, static_cast<const double *>(nullptr)) {}
+
+    using ShapeContainer = detail::any_container<ssize_t>;
+    using StridesContainer = detail::any_container<ssize_t>;
+
+    // Constructs an array taking shape/strides from arbitrary container types
+    array(const pybind11::dtype &dt, ShapeContainer shape, StridesContainer strides,
+          const void *ptr = nullptr, handle base = handle()) {
+
+        if (strides->empty())
+            *strides = c_strides(*shape, dt.itemsize());
+
+        auto ndim = shape->size();
+        if (ndim != strides->size())
+            pybind11_fail("NumPy: shape ndim doesn't match strides ndim");
+        auto descr = dt;
+
+        int flags = 0;
+        if (base && ptr) {
+            if (isinstance<array>(base))
+                /* Copy flags from base (except ownership bit) */
+                flags = reinterpret_borrow<array>(base).flags() & ~detail::npy_api::NPY_ARRAY_OWNDATA_;
+            else
+                /* Writable by default, easy to downgrade later on if needed */
+                flags = detail::npy_api::NPY_ARRAY_WRITEABLE_;
+        }
+
+        auto &api = detail::npy_api::get();
+        auto tmp = reinterpret_steal<object>(api.PyArray_NewFromDescr_(
+            api.PyArray_Type_, descr.release().ptr(), (int) ndim, shape->data(), strides->data(),
+            const_cast<void *>(ptr), flags, nullptr));
+        if (!tmp)
+            throw error_already_set();
+        if (ptr) {
+            if (base) {
+                api.PyArray_SetBaseObject_(tmp.ptr(), base.inc_ref().ptr());
+            } else {
+                tmp = reinterpret_steal<object>(api.PyArray_NewCopy_(tmp.ptr(), -1 /* any order */));
+            }
+        }
+        m_ptr = tmp.release().ptr();
+    }
+
+    array(const pybind11::dtype &dt, ShapeContainer shape, const void *ptr = nullptr, handle base = handle())
+        : array(dt, std::move(shape), {}, ptr, base) { }
+
+    template <typename T, typename = detail::enable_if_t<std::is_integral<T>::value && !std::is_same<bool, T>::value>>
+    array(const pybind11::dtype &dt, T count, const void *ptr = nullptr, handle base = handle())
+        : array(dt, {{count}}, ptr, base) { }
+
+    template <typename T>
+    array(ShapeContainer shape, StridesContainer strides, const T *ptr, handle base = handle())
+        : array(pybind11::dtype::of<T>(), std::move(shape), std::move(strides), ptr, base) { }
+
+    template <typename T>
+    array(ShapeContainer shape, const T *ptr, handle base = handle())
+        : array(std::move(shape), {}, ptr, base) { }
+
+    template <typename T>
+    explicit array(ssize_t count, const T *ptr, handle base = handle()) : array({count}, {}, ptr, base) { }
+
+    explicit array(const buffer_info &info)
+    : array(pybind11::dtype(info), info.shape, info.strides, info.ptr) { }
+
+    /// Array descriptor (dtype)
+    pybind11::dtype dtype() const {
+        return reinterpret_borrow<pybind11::dtype>(detail::array_proxy(m_ptr)->descr);
+    }
+
+    /// Total number of elements
+    ssize_t size() const {
+        return std::accumulate(shape(), shape() + ndim(), (ssize_t) 1, std::multiplies<ssize_t>());
+    }
+
+    /// Byte size of a single element
+    ssize_t itemsize() const {
+        return detail::array_descriptor_proxy(detail::array_proxy(m_ptr)->descr)->elsize;
+    }
+
+    /// Total number of bytes
+    ssize_t nbytes() const {
+        return size() * itemsize();
+    }
+
+    /// Number of dimensions
+    ssize_t ndim() const {
+        return detail::array_proxy(m_ptr)->nd;
+    }
+
+    /// Base object
+    object base() const {
+        return reinterpret_borrow<object>(detail::array_proxy(m_ptr)->base);
+    }
+
+    /// Dimensions of the array
+    const ssize_t* shape() const {
+        return detail::array_proxy(m_ptr)->dimensions;
+    }
+
+    /// Dimension along a given axis
+    ssize_t shape(ssize_t dim) const {
+        if (dim >= ndim())
+            fail_dim_check(dim, "invalid axis");
+        return shape()[dim];
+    }
+
+    /// Strides of the array
+    const ssize_t* strides() const {
+        return detail::array_proxy(m_ptr)->strides;
+    }
+
+    /// Stride along a given axis
+    ssize_t strides(ssize_t dim) const {
+        if (dim >= ndim())
+            fail_dim_check(dim, "invalid axis");
+        return strides()[dim];
+    }
+
+    /// Return the NumPy array flags
+    int flags() const {
+        return detail::array_proxy(m_ptr)->flags;
+    }
+
+    /// If set, the array is writeable (otherwise the buffer is read-only)
+    bool writeable() const {
+        return detail::check_flags(m_ptr, detail::npy_api::NPY_ARRAY_WRITEABLE_);
+    }
+
+    /// If set, the array owns the data (will be freed when the array is deleted)
+    bool owndata() const {
+        return detail::check_flags(m_ptr, detail::npy_api::NPY_ARRAY_OWNDATA_);
+    }
+
+    /// Pointer to the contained data. If index is not provided, points to the
+    /// beginning of the buffer. May throw if the index would lead to out of bounds access.
+    template<typename... Ix> const void* data(Ix... index) const {
+        return static_cast<const void *>(detail::array_proxy(m_ptr)->data + offset_at(index...));
+    }
+
+    /// Mutable pointer to the contained data. If index is not provided, points to the
+    /// beginning of the buffer. May throw if the index would lead to out of bounds access.
+    /// May throw if the array is not writeable.
+    template<typename... Ix> void* mutable_data(Ix... index) {
+        check_writeable();
+        return static_cast<void *>(detail::array_proxy(m_ptr)->data + offset_at(index...));
+    }
+
+    /// Byte offset from beginning of the array to a given index (full or partial).
+    /// May throw if the index would lead to out of bounds access.
+    template<typename... Ix> ssize_t offset_at(Ix... index) const {
+        if ((ssize_t) sizeof...(index) > ndim())
+            fail_dim_check(sizeof...(index), "too many indices for an array");
+        return byte_offset(ssize_t(index)...);
+    }
+
+    ssize_t offset_at() const { return 0; }
+
+    /// Item count from beginning of the array to a given index (full or partial).
+    /// May throw if the index would lead to out of bounds access.
+    template<typename... Ix> ssize_t index_at(Ix... index) const {
+        return offset_at(index...) / itemsize();
+    }
+
+    /**
+     * Returns a proxy object that provides access to the array's data without bounds or
+     * dimensionality checking.  Will throw if the array is missing the `writeable` flag.  Use with
+     * care: the array must not be destroyed or reshaped for the duration of the returned object,
+     * and the caller must take care not to access invalid dimensions or dimension indices.
+     */
+    template <typename T, ssize_t Dims = -1> detail::unchecked_mutable_reference<T, Dims> mutable_unchecked() & {
+        if (Dims >= 0 && ndim() != Dims)
+            throw std::domain_error("array has incorrect number of dimensions: " + std::to_string(ndim()) +
+                    "; expected " + std::to_string(Dims));
+        return detail::unchecked_mutable_reference<T, Dims>(mutable_data(), shape(), strides(), ndim());
+    }
+
+    /**
+     * Returns a proxy object that provides const access to the array's data without bounds or
+     * dimensionality checking.  Unlike `mutable_unchecked()`, this does not require that the
+     * underlying array have the `writable` flag.  Use with care: the array must not be destroyed or
+     * reshaped for the duration of the returned object, and the caller must take care not to access
+     * invalid dimensions or dimension indices.
+     */
+    template <typename T, ssize_t Dims = -1> detail::unchecked_reference<T, Dims> unchecked() const & {
+        if (Dims >= 0 && ndim() != Dims)
+            throw std::domain_error("array has incorrect number of dimensions: " + std::to_string(ndim()) +
+                    "; expected " + std::to_string(Dims));
+        return detail::unchecked_reference<T, Dims>(data(), shape(), strides(), ndim());
+    }
+
+    /// Return a new view with all of the dimensions of length 1 removed
+    array squeeze() {
+        auto& api = detail::npy_api::get();
+        return reinterpret_steal<array>(api.PyArray_Squeeze_(m_ptr));
+    }
+
+    /// Resize array to given shape
+    /// If refcheck is true and more that one reference exist to this array
+    /// then resize will succeed only if it makes a reshape, i.e. original size doesn't change
+    void resize(ShapeContainer new_shape, bool refcheck = true) {
+        detail::npy_api::PyArray_Dims d = {
+            new_shape->data(), int(new_shape->size())
+        };
+        // try to resize, set ordering param to -1 cause it's not used anyway
+        object new_array = reinterpret_steal<object>(
+            detail::npy_api::get().PyArray_Resize_(m_ptr, &d, int(refcheck), -1)
+        );
+        if (!new_array) throw error_already_set();
+        if (isinstance<array>(new_array)) { *this = std::move(new_array); }
+    }
+
+    /// Ensure that the argument is a NumPy array
+    /// In case of an error, nullptr is returned and the Python error is cleared.
+    static array ensure(handle h, int ExtraFlags = 0) {
+        auto result = reinterpret_steal<array>(raw_array(h.ptr(), ExtraFlags));
+        if (!result)
+            PyErr_Clear();
+        return result;
+    }
+
+protected:
+    template<typename, typename> friend struct detail::npy_format_descriptor;
+
+    void fail_dim_check(ssize_t dim, const std::string& msg) const {
+        throw index_error(msg + ": " + std::to_string(dim) +
+                          " (ndim = " + std::to_string(ndim()) + ")");
+    }
+
+    template<typename... Ix> ssize_t byte_offset(Ix... index) const {
+        check_dimensions(index...);
+        return detail::byte_offset_unsafe(strides(), ssize_t(index)...);
+    }
+
+    void check_writeable() const {
+        if (!writeable())
+            throw std::domain_error("array is not writeable");
+    }
+
+    // Default, C-style strides
+    static std::vector<ssize_t> c_strides(const std::vector<ssize_t> &shape, ssize_t itemsize) {
+        auto ndim = shape.size();
+        std::vector<ssize_t> strides(ndim, itemsize);
+        if (ndim > 0)
+            for (size_t i = ndim - 1; i > 0; --i)
+                strides[i - 1] = strides[i] * shape[i];
+        return strides;
+    }
+
+    // F-style strides; default when constructing an array_t with `ExtraFlags & f_style`
+    static std::vector<ssize_t> f_strides(const std::vector<ssize_t> &shape, ssize_t itemsize) {
+        auto ndim = shape.size();
+        std::vector<ssize_t> strides(ndim, itemsize);
+        for (size_t i = 1; i < ndim; ++i)
+            strides[i] = strides[i - 1] * shape[i - 1];
+        return strides;
+    }
+
+    template<typename... Ix> void check_dimensions(Ix... index) const {
+        check_dimensions_impl(ssize_t(0), shape(), ssize_t(index)...);
+    }
+
+    void check_dimensions_impl(ssize_t, const ssize_t*) const { }
+
+    template<typename... Ix> void check_dimensions_impl(ssize_t axis, const ssize_t* shape, ssize_t i, Ix... index) const {
+        if (i >= *shape) {
+            throw index_error(std::string("index ") + std::to_string(i) +
+                              " is out of bounds for axis " + std::to_string(axis) +
+                              " with size " + std::to_string(*shape));
+        }
+        check_dimensions_impl(axis + 1, shape + 1, index...);
+    }
+
+    /// Create array from any object -- always returns a new reference
+    static PyObject *raw_array(PyObject *ptr, int ExtraFlags = 0) {
+        if (ptr == nullptr) {
+            PyErr_SetString(PyExc_ValueError, "cannot create a pybind11::array from a nullptr");
+            return nullptr;
+        }
+        return detail::npy_api::get().PyArray_FromAny_(
+            ptr, nullptr, 0, 0, detail::npy_api::NPY_ARRAY_ENSUREARRAY_ | ExtraFlags, nullptr);
+    }
+};
+
+template <typename T, int ExtraFlags = array::forcecast> class array_t : public array {
+private:
+    struct private_ctor {};
+    // Delegating constructor needed when both moving and accessing in the same constructor
+    array_t(private_ctor, ShapeContainer &&shape, StridesContainer &&strides, const T *ptr, handle base)
+        : array(std::move(shape), std::move(strides), ptr, base) {}
+public:
+    static_assert(!detail::array_info<T>::is_array, "Array types cannot be used with array_t");
+
+    using value_type = T;
+
+    array_t() : array(0, static_cast<const T *>(nullptr)) {}
+    array_t(handle h, borrowed_t) : array(h, borrowed_t{}) { }
+    array_t(handle h, stolen_t) : array(h, stolen_t{}) { }
+
+    PYBIND11_DEPRECATED("Use array_t<T>::ensure() instead")
+    array_t(handle h, bool is_borrowed) : array(raw_array_t(h.ptr()), stolen_t{}) {
+        if (!m_ptr) PyErr_Clear();
+        if (!is_borrowed) Py_XDECREF(h.ptr());
+    }
+
+    array_t(const object &o) : array(raw_array_t(o.ptr()), stolen_t{}) {
+        if (!m_ptr) throw error_already_set();
+    }
+
+    explicit array_t(const buffer_info& info) : array(info) { }
+
+    array_t(ShapeContainer shape, StridesContainer strides, const T *ptr = nullptr, handle base = handle())
+        : array(std::move(shape), std::move(strides), ptr, base) { }
+
+    explicit array_t(ShapeContainer shape, const T *ptr = nullptr, handle base = handle())
+        : array_t(private_ctor{}, std::move(shape),
+                ExtraFlags & f_style ? f_strides(*shape, itemsize()) : c_strides(*shape, itemsize()),
+                ptr, base) { }
+
+    explicit array_t(size_t count, const T *ptr = nullptr, handle base = handle())
+        : array({count}, {}, ptr, base) { }
+
+    constexpr ssize_t itemsize() const {
+        return sizeof(T);
+    }
+
+    template<typename... Ix> ssize_t index_at(Ix... index) const {
+        return offset_at(index...) / itemsize();
+    }
+
+    template<typename... Ix> const T* data(Ix... index) const {
+        return static_cast<const T*>(array::data(index...));
+    }
+
+    template<typename... Ix> T* mutable_data(Ix... index) {
+        return static_cast<T*>(array::mutable_data(index...));
+    }
+
+    // Reference to element at a given index
+    template<typename... Ix> const T& at(Ix... index) const {
+        if ((ssize_t) sizeof...(index) != ndim())
+            fail_dim_check(sizeof...(index), "index dimension mismatch");
+        return *(static_cast<const T*>(array::data()) + byte_offset(ssize_t(index)...) / itemsize());
+    }
+
+    // Mutable reference to element at a given index
+    template<typename... Ix> T& mutable_at(Ix... index) {
+        if ((ssize_t) sizeof...(index) != ndim())
+            fail_dim_check(sizeof...(index), "index dimension mismatch");
+        return *(static_cast<T*>(array::mutable_data()) + byte_offset(ssize_t(index)...) / itemsize());
+    }
+
+    /**
+     * Returns a proxy object that provides access to the array's data without bounds or
+     * dimensionality checking.  Will throw if the array is missing the `writeable` flag.  Use with
+     * care: the array must not be destroyed or reshaped for the duration of the returned object,
+     * and the caller must take care not to access invalid dimensions or dimension indices.
+     */
+    template <ssize_t Dims = -1> detail::unchecked_mutable_reference<T, Dims> mutable_unchecked() & {
+        return array::mutable_unchecked<T, Dims>();
+    }
+
+    /**
+     * Returns a proxy object that provides const access to the array's data without bounds or
+     * dimensionality checking.  Unlike `unchecked()`, this does not require that the underlying
+     * array have the `writable` flag.  Use with care: the array must not be destroyed or reshaped
+     * for the duration of the returned object, and the caller must take care not to access invalid
+     * dimensions or dimension indices.
+     */
+    template <ssize_t Dims = -1> detail::unchecked_reference<T, Dims> unchecked() const & {
+        return array::unchecked<T, Dims>();
+    }
+
+    /// Ensure that the argument is a NumPy array of the correct dtype (and if not, try to convert
+    /// it).  In case of an error, nullptr is returned and the Python error is cleared.
+    static array_t ensure(handle h) {
+        auto result = reinterpret_steal<array_t>(raw_array_t(h.ptr()));
+        if (!result)
+            PyErr_Clear();
+        return result;
+    }
+
+    static bool check_(handle h) {
+        const auto &api = detail::npy_api::get();
+        return api.PyArray_Check_(h.ptr())
+               && api.PyArray_EquivTypes_(detail::array_proxy(h.ptr())->descr, dtype::of<T>().ptr());
+    }
+
+protected:
+    /// Create array from any object -- always returns a new reference
+    static PyObject *raw_array_t(PyObject *ptr) {
+        if (ptr == nullptr) {
+            PyErr_SetString(PyExc_ValueError, "cannot create a pybind11::array_t from a nullptr");
+            return nullptr;
+        }
+        return detail::npy_api::get().PyArray_FromAny_(
+            ptr, dtype::of<T>().release().ptr(), 0, 0,
+            detail::npy_api::NPY_ARRAY_ENSUREARRAY_ | ExtraFlags, nullptr);
+    }
+};
+
+template <typename T>
+struct format_descriptor<T, detail::enable_if_t<detail::is_pod_struct<T>::value>> {
+    static std::string format() {
+        return detail::npy_format_descriptor<typename std::remove_cv<T>::type>::format();
+    }
+};
+
+template <size_t N> struct format_descriptor<char[N]> {
+    static std::string format() { return std::to_string(N) + "s"; }
+};
+template <size_t N> struct format_descriptor<std::array<char, N>> {
+    static std::string format() { return std::to_string(N) + "s"; }
+};
+
+template <typename T>
+struct format_descriptor<T, detail::enable_if_t<std::is_enum<T>::value>> {
+    static std::string format() {
+        return format_descriptor<
+            typename std::remove_cv<typename std::underlying_type<T>::type>::type>::format();
+    }
+};
+
+template <typename T>
+struct format_descriptor<T, detail::enable_if_t<detail::array_info<T>::is_array>> {
+    static std::string format() {
+        using namespace detail;
+        static constexpr auto extents = _("(") + array_info<T>::extents + _(")");
+        return extents.text + format_descriptor<remove_all_extents_t<T>>::format();
+    }
+};
+
+NAMESPACE_BEGIN(detail)
+template <typename T, int ExtraFlags>
+struct pyobject_caster<array_t<T, ExtraFlags>> {
+    using type = array_t<T, ExtraFlags>;
+
+    bool load(handle src, bool convert) {
+        if (!convert && !type::check_(src))
+            return false;
+        value = type::ensure(src);
+        return static_cast<bool>(value);
+    }
+
+    static handle cast(const handle &src, return_value_policy /* policy */, handle /* parent */) {
+        return src.inc_ref();
+    }
+    PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name);
+};
+
+template <typename T>
+struct compare_buffer_info<T, detail::enable_if_t<detail::is_pod_struct<T>::value>> {
+    static bool compare(const buffer_info& b) {
+        return npy_api::get().PyArray_EquivTypes_(dtype::of<T>().ptr(), dtype(b).ptr());
+    }
+};
+
+template <typename T, typename = void>
+struct npy_format_descriptor_name;
+
+template <typename T>
+struct npy_format_descriptor_name<T, enable_if_t<std::is_integral<T>::value>> {
+    static constexpr auto name = _<std::is_same<T, bool>::value>(
+        _("bool"), _<std::is_signed<T>::value>("int", "uint") + _<sizeof(T)*8>()
+    );
+};
+
+template <typename T>
+struct npy_format_descriptor_name<T, enable_if_t<std::is_floating_point<T>::value>> {
+    static constexpr auto name = _<std::is_same<T, float>::value || std::is_same<T, double>::value>(
+        _("float") + _<sizeof(T)*8>(), _("longdouble")
+    );
+};
+
+template <typename T>
+struct npy_format_descriptor_name<T, enable_if_t<is_complex<T>::value>> {
+    static constexpr auto name = _<std::is_same<typename T::value_type, float>::value
+                                   || std::is_same<typename T::value_type, double>::value>(
+        _("complex") + _<sizeof(typename T::value_type)*16>(), _("longcomplex")
+    );
+};
+
+template <typename T>
+struct npy_format_descriptor<T, enable_if_t<satisfies_any_of<T, std::is_arithmetic, is_complex>::value>>
+    : npy_format_descriptor_name<T> {
+private:
+    // NB: the order here must match the one in common.h
+    constexpr static const int values[15] = {
+        npy_api::NPY_BOOL_,
+        npy_api::NPY_BYTE_,   npy_api::NPY_UBYTE_,   npy_api::NPY_INT16_,    npy_api::NPY_UINT16_,
+        npy_api::NPY_INT32_,  npy_api::NPY_UINT32_,  npy_api::NPY_INT64_,    npy_api::NPY_UINT64_,
+        npy_api::NPY_FLOAT_,  npy_api::NPY_DOUBLE_,  npy_api::NPY_LONGDOUBLE_,
+        npy_api::NPY_CFLOAT_, npy_api::NPY_CDOUBLE_, npy_api::NPY_CLONGDOUBLE_
+    };
+
+public:
+    static constexpr int value = values[detail::is_fmt_numeric<T>::index];
+
+    static pybind11::dtype dtype() {
+        if (auto ptr = npy_api::get().PyArray_DescrFromType_(value))
+            return reinterpret_steal<pybind11::dtype>(ptr);
+        pybind11_fail("Unsupported buffer format!");
+    }
+};
+
+#define PYBIND11_DECL_CHAR_FMT \
+    static constexpr auto name = _("S") + _<N>(); \
+    static pybind11::dtype dtype() { return pybind11::dtype(std::string("S") + std::to_string(N)); }
+template <size_t N> struct npy_format_descriptor<char[N]> { PYBIND11_DECL_CHAR_FMT };
+template <size_t N> struct npy_format_descriptor<std::array<char, N>> { PYBIND11_DECL_CHAR_FMT };
+#undef PYBIND11_DECL_CHAR_FMT
+
+template<typename T> struct npy_format_descriptor<T, enable_if_t<array_info<T>::is_array>> {
+private:
+    using base_descr = npy_format_descriptor<typename array_info<T>::type>;
+public:
+    static_assert(!array_info<T>::is_empty, "Zero-sized arrays are not supported");
+
+    static constexpr auto name = _("(") + array_info<T>::extents + _(")") + base_descr::name;
+    static pybind11::dtype dtype() {
+        list shape;
+        array_info<T>::append_extents(shape);
+        return pybind11::dtype::from_args(pybind11::make_tuple(base_descr::dtype(), shape));
+    }
+};
+
+template<typename T> struct npy_format_descriptor<T, enable_if_t<std::is_enum<T>::value>> {
+private:
+    using base_descr = npy_format_descriptor<typename std::underlying_type<T>::type>;
+public:
+    static constexpr auto name = base_descr::name;
+    static pybind11::dtype dtype() { return base_descr::dtype(); }
+};
+
+struct field_descriptor {
+    const char *name;
+    ssize_t offset;
+    ssize_t size;
+    std::string format;
+    dtype descr;
+};
+
+inline PYBIND11_NOINLINE void register_structured_dtype(
+    any_container<field_descriptor> fields,
+    const std::type_info& tinfo, ssize_t itemsize,
+    bool (*direct_converter)(PyObject *, void *&)) {
+
+    auto& numpy_internals = get_numpy_internals();
+    if (numpy_internals.get_type_info(tinfo, false))
+        pybind11_fail("NumPy: dtype is already registered");
+
+    // Use ordered fields because order matters as of NumPy 1.14:
+    // https://docs.scipy.org/doc/numpy/release.html#multiple-field-indexing-assignment-of-structured-arrays
+    std::vector<field_descriptor> ordered_fields(std::move(fields));
+    std::sort(ordered_fields.begin(), ordered_fields.end(),
+        [](const field_descriptor &a, const field_descriptor &b) { return a.offset < b.offset; });
+
+    list names, formats, offsets;
+    for (auto& field : ordered_fields) {
+        if (!field.descr)
+            pybind11_fail(std::string("NumPy: unsupported field dtype: `") +
+                            field.name + "` @ " + tinfo.name());
+        names.append(PYBIND11_STR_TYPE(field.name));
+        formats.append(field.descr);
+        offsets.append(pybind11::int_(field.offset));
+    }
+    auto dtype_ptr = pybind11::dtype(names, formats, offsets, itemsize).release().ptr();
+
+    // There is an existing bug in NumPy (as of v1.11): trailing bytes are
+    // not encoded explicitly into the format string. This will supposedly
+    // get fixed in v1.12; for further details, see these:
+    // - https://github.com/numpy/numpy/issues/7797
+    // - https://github.com/numpy/numpy/pull/7798
+    // Because of this, we won't use numpy's logic to generate buffer format
+    // strings and will just do it ourselves.
+    ssize_t offset = 0;
+    std::ostringstream oss;
+    // mark the structure as unaligned with '^', because numpy and C++ don't
+    // always agree about alignment (particularly for complex), and we're
+    // explicitly listing all our padding. This depends on none of the fields
+    // overriding the endianness. Putting the ^ in front of individual fields
+    // isn't guaranteed to work due to https://github.com/numpy/numpy/issues/9049
+    oss << "^T{";
+    for (auto& field : ordered_fields) {
+        if (field.offset > offset)
+            oss << (field.offset - offset) << 'x';
+        oss << field.format << ':' << field.name << ':';
+        offset = field.offset + field.size;
+    }
+    if (itemsize > offset)
+        oss << (itemsize - offset) << 'x';
+    oss << '}';
+    auto format_str = oss.str();
+
+    // Sanity check: verify that NumPy properly parses our buffer format string
+    auto& api = npy_api::get();
+    auto arr =  array(buffer_info(nullptr, itemsize, format_str, 1));
+    if (!api.PyArray_EquivTypes_(dtype_ptr, arr.dtype().ptr()))
+        pybind11_fail("NumPy: invalid buffer descriptor!");
+
+    auto tindex = std::type_index(tinfo);
+    numpy_internals.registered_dtypes[tindex] = { dtype_ptr, format_str };
+    get_internals().direct_conversions[tindex].push_back(direct_converter);
+}
+
+template <typename T, typename SFINAE> struct npy_format_descriptor {
+    static_assert(is_pod_struct<T>::value, "Attempt to use a non-POD or unimplemented POD type as a numpy dtype");
+
+    static constexpr auto name = make_caster<T>::name;
+
+    static pybind11::dtype dtype() {
+        return reinterpret_borrow<pybind11::dtype>(dtype_ptr());
+    }
+
+    static std::string format() {
+        static auto format_str = get_numpy_internals().get_type_info<T>(true)->format_str;
+        return format_str;
+    }
+
+    static void register_dtype(any_container<field_descriptor> fields) {
+        register_structured_dtype(std::move(fields), typeid(typename std::remove_cv<T>::type),
+                                  sizeof(T), &direct_converter);
+    }
+
+private:
+    static PyObject* dtype_ptr() {
+        static PyObject* ptr = get_numpy_internals().get_type_info<T>(true)->dtype_ptr;
+        return ptr;
+    }
+
+    static bool direct_converter(PyObject *obj, void*& value) {
+        auto& api = npy_api::get();
+        if (!PyObject_TypeCheck(obj, api.PyVoidArrType_Type_))
+            return false;
+        if (auto descr = reinterpret_steal<object>(api.PyArray_DescrFromScalar_(obj))) {
+            if (api.PyArray_EquivTypes_(dtype_ptr(), descr.ptr())) {
+                value = ((PyVoidScalarObject_Proxy *) obj)->obval;
+                return true;
+            }
+        }
+        return false;
+    }
+};
+
+#ifdef __CLION_IDE__ // replace heavy macro with dummy code for the IDE (doesn't affect code)
+# define PYBIND11_NUMPY_DTYPE(Type, ...) ((void)0)
+# define PYBIND11_NUMPY_DTYPE_EX(Type, ...) ((void)0)
+#else
+
+#define PYBIND11_FIELD_DESCRIPTOR_EX(T, Field, Name)                                          \
+    ::pybind11::detail::field_descriptor {                                                    \
+        Name, offsetof(T, Field), sizeof(decltype(std::declval<T>().Field)),                  \
+        ::pybind11::format_descriptor<decltype(std::declval<T>().Field)>::format(),           \
+        ::pybind11::detail::npy_format_descriptor<decltype(std::declval<T>().Field)>::dtype() \
+    }
+
+// Extract name, offset and format descriptor for a struct field
+#define PYBIND11_FIELD_DESCRIPTOR(T, Field) PYBIND11_FIELD_DESCRIPTOR_EX(T, Field, #Field)
+
+// The main idea of this macro is borrowed from https://github.com/swansontec/map-macro
+// (C) William Swanson, Paul Fultz
+#define PYBIND11_EVAL0(...) __VA_ARGS__
+#define PYBIND11_EVAL1(...) PYBIND11_EVAL0 (PYBIND11_EVAL0 (PYBIND11_EVAL0 (__VA_ARGS__)))
+#define PYBIND11_EVAL2(...) PYBIND11_EVAL1 (PYBIND11_EVAL1 (PYBIND11_EVAL1 (__VA_ARGS__)))
+#define PYBIND11_EVAL3(...) PYBIND11_EVAL2 (PYBIND11_EVAL2 (PYBIND11_EVAL2 (__VA_ARGS__)))
+#define PYBIND11_EVAL4(...) PYBIND11_EVAL3 (PYBIND11_EVAL3 (PYBIND11_EVAL3 (__VA_ARGS__)))
+#define PYBIND11_EVAL(...)  PYBIND11_EVAL4 (PYBIND11_EVAL4 (PYBIND11_EVAL4 (__VA_ARGS__)))
+#define PYBIND11_MAP_END(...)
+#define PYBIND11_MAP_OUT
+#define PYBIND11_MAP_COMMA ,
+#define PYBIND11_MAP_GET_END() 0, PYBIND11_MAP_END
+#define PYBIND11_MAP_NEXT0(test, next, ...) next PYBIND11_MAP_OUT
+#define PYBIND11_MAP_NEXT1(test, next) PYBIND11_MAP_NEXT0 (test, next, 0)
+#define PYBIND11_MAP_NEXT(test, next)  PYBIND11_MAP_NEXT1 (PYBIND11_MAP_GET_END test, next)
+#ifdef _MSC_VER // MSVC is not as eager to expand macros, hence this workaround
+#define PYBIND11_MAP_LIST_NEXT1(test, next) \
+    PYBIND11_EVAL0 (PYBIND11_MAP_NEXT0 (test, PYBIND11_MAP_COMMA next, 0))
+#else
+#define PYBIND11_MAP_LIST_NEXT1(test, next) \
+    PYBIND11_MAP_NEXT0 (test, PYBIND11_MAP_COMMA next, 0)
+#endif
+#define PYBIND11_MAP_LIST_NEXT(test, next) \
+    PYBIND11_MAP_LIST_NEXT1 (PYBIND11_MAP_GET_END test, next)
+#define PYBIND11_MAP_LIST0(f, t, x, peek, ...) \
+    f(t, x) PYBIND11_MAP_LIST_NEXT (peek, PYBIND11_MAP_LIST1) (f, t, peek, __VA_ARGS__)
+#define PYBIND11_MAP_LIST1(f, t, x, peek, ...) \
+    f(t, x) PYBIND11_MAP_LIST_NEXT (peek, PYBIND11_MAP_LIST0) (f, t, peek, __VA_ARGS__)
+// PYBIND11_MAP_LIST(f, t, a1, a2, ...) expands to f(t, a1), f(t, a2), ...
+#define PYBIND11_MAP_LIST(f, t, ...) \
+    PYBIND11_EVAL (PYBIND11_MAP_LIST1 (f, t, __VA_ARGS__, (), 0))
+
+#define PYBIND11_NUMPY_DTYPE(Type, ...) \
+    ::pybind11::detail::npy_format_descriptor<Type>::register_dtype \
+        (::std::vector<::pybind11::detail::field_descriptor> \
+         {PYBIND11_MAP_LIST (PYBIND11_FIELD_DESCRIPTOR, Type, __VA_ARGS__)})
+
+#ifdef _MSC_VER
+#define PYBIND11_MAP2_LIST_NEXT1(test, next) \
+    PYBIND11_EVAL0 (PYBIND11_MAP_NEXT0 (test, PYBIND11_MAP_COMMA next, 0))
+#else
+#define PYBIND11_MAP2_LIST_NEXT1(test, next) \
+    PYBIND11_MAP_NEXT0 (test, PYBIND11_MAP_COMMA next, 0)
+#endif
+#define PYBIND11_MAP2_LIST_NEXT(test, next) \
+    PYBIND11_MAP2_LIST_NEXT1 (PYBIND11_MAP_GET_END test, next)
+#define PYBIND11_MAP2_LIST0(f, t, x1, x2, peek, ...) \
+    f(t, x1, x2) PYBIND11_MAP2_LIST_NEXT (peek, PYBIND11_MAP2_LIST1) (f, t, peek, __VA_ARGS__)
+#define PYBIND11_MAP2_LIST1(f, t, x1, x2, peek, ...) \
+    f(t, x1, x2) PYBIND11_MAP2_LIST_NEXT (peek, PYBIND11_MAP2_LIST0) (f, t, peek, __VA_ARGS__)
+// PYBIND11_MAP2_LIST(f, t, a1, a2, ...) expands to f(t, a1, a2), f(t, a3, a4), ...
+#define PYBIND11_MAP2_LIST(f, t, ...) \
+    PYBIND11_EVAL (PYBIND11_MAP2_LIST1 (f, t, __VA_ARGS__, (), 0))
+
+#define PYBIND11_NUMPY_DTYPE_EX(Type, ...) \
+    ::pybind11::detail::npy_format_descriptor<Type>::register_dtype \
+        (::std::vector<::pybind11::detail::field_descriptor> \
+         {PYBIND11_MAP2_LIST (PYBIND11_FIELD_DESCRIPTOR_EX, Type, __VA_ARGS__)})
+
+#endif // __CLION_IDE__
+
+template  <class T>
+using array_iterator = typename std::add_pointer<T>::type;
+
+template <class T>
+array_iterator<T> array_begin(const buffer_info& buffer) {
+    return array_iterator<T>(reinterpret_cast<T*>(buffer.ptr));
+}
+
+template <class T>
+array_iterator<T> array_end(const buffer_info& buffer) {
+    return array_iterator<T>(reinterpret_cast<T*>(buffer.ptr) + buffer.size);
+}
+
+class common_iterator {
+public:
+    using container_type = std::vector<ssize_t>;
+    using value_type = container_type::value_type;
+    using size_type = container_type::size_type;
+
+    common_iterator() : p_ptr(0), m_strides() {}
+
+    common_iterator(void* ptr, const container_type& strides, const container_type& shape)
+        : p_ptr(reinterpret_cast<char*>(ptr)), m_strides(strides.size()) {
+        m_strides.back() = static_cast<value_type>(strides.back());
+        for (size_type i = m_strides.size() - 1; i != 0; --i) {
+            size_type j = i - 1;
+            value_type s = static_cast<value_type>(shape[i]);
+            m_strides[j] = strides[j] + m_strides[i] - strides[i] * s;
+        }
+    }
+
+    void increment(size_type dim) {
+        p_ptr += m_strides[dim];
+    }
+
+    void* data() const {
+        return p_ptr;
+    }
+
+private:
+    char* p_ptr;
+    container_type m_strides;
+};
+
+template <size_t N> class multi_array_iterator {
+public:
+    using container_type = std::vector<ssize_t>;
+
+    multi_array_iterator(const std::array<buffer_info, N> &buffers,
+                         const container_type &shape)
+        : m_shape(shape.size()), m_index(shape.size(), 0),
+          m_common_iterator() {
+
+        // Manual copy to avoid conversion warning if using std::copy
+        for (size_t i = 0; i < shape.size(); ++i)
+            m_shape[i] = shape[i];
+
+        container_type strides(shape.size());
+        for (size_t i = 0; i < N; ++i)
+            init_common_iterator(buffers[i], shape, m_common_iterator[i], strides);
+    }
+
+    multi_array_iterator& operator++() {
+        for (size_t j = m_index.size(); j != 0; --j) {
+            size_t i = j - 1;
+            if (++m_index[i] != m_shape[i]) {
+                increment_common_iterator(i);
+                break;
+            } else {
+                m_index[i] = 0;
+            }
+        }
+        return *this;
+    }
+
+    template <size_t K, class T = void> T* data() const {
+        return reinterpret_cast<T*>(m_common_iterator[K].data());
+    }
+
+private:
+
+    using common_iter = common_iterator;
+
+    void init_common_iterator(const buffer_info &buffer,
+                              const container_type &shape,
+                              common_iter &iterator,
+                              container_type &strides) {
+        auto buffer_shape_iter = buffer.shape.rbegin();
+        auto buffer_strides_iter = buffer.strides.rbegin();
+        auto shape_iter = shape.rbegin();
+        auto strides_iter = strides.rbegin();
+
+        while (buffer_shape_iter != buffer.shape.rend()) {
+            if (*shape_iter == *buffer_shape_iter)
+                *strides_iter = *buffer_strides_iter;
+            else
+                *strides_iter = 0;
+
+            ++buffer_shape_iter;
+            ++buffer_strides_iter;
+            ++shape_iter;
+            ++strides_iter;
+        }
+
+        std::fill(strides_iter, strides.rend(), 0);
+        iterator = common_iter(buffer.ptr, strides, shape);
+    }
+
+    void increment_common_iterator(size_t dim) {
+        for (auto &iter : m_common_iterator)
+            iter.increment(dim);
+    }
+
+    container_type m_shape;
+    container_type m_index;
+    std::array<common_iter, N> m_common_iterator;
+};
+
+enum class broadcast_trivial { non_trivial, c_trivial, f_trivial };
+
+// Populates the shape and number of dimensions for the set of buffers.  Returns a broadcast_trivial
+// enum value indicating whether the broadcast is "trivial"--that is, has each buffer being either a
+// singleton or a full-size, C-contiguous (`c_trivial`) or Fortran-contiguous (`f_trivial`) storage
+// buffer; returns `non_trivial` otherwise.
+template <size_t N>
+broadcast_trivial broadcast(const std::array<buffer_info, N> &buffers, ssize_t &ndim, std::vector<ssize_t> &shape) {
+    ndim = std::accumulate(buffers.begin(), buffers.end(), ssize_t(0), [](ssize_t res, const buffer_info &buf) {
+        return std::max(res, buf.ndim);
+    });
+
+    shape.clear();
+    shape.resize((size_t) ndim, 1);
+
+    // Figure out the output size, and make sure all input arrays conform (i.e. are either size 1 or
+    // the full size).
+    for (size_t i = 0; i < N; ++i) {
+        auto res_iter = shape.rbegin();
+        auto end = buffers[i].shape.rend();
+        for (auto shape_iter = buffers[i].shape.rbegin(); shape_iter != end; ++shape_iter, ++res_iter) {
+            const auto &dim_size_in = *shape_iter;
+            auto &dim_size_out = *res_iter;
+
+            // Each input dimension can either be 1 or `n`, but `n` values must match across buffers
+            if (dim_size_out == 1)
+                dim_size_out = dim_size_in;
+            else if (dim_size_in != 1 && dim_size_in != dim_size_out)
+                pybind11_fail("pybind11::vectorize: incompatible size/dimension of inputs!");
+        }
+    }
+
+    bool trivial_broadcast_c = true;
+    bool trivial_broadcast_f = true;
+    for (size_t i = 0; i < N && (trivial_broadcast_c || trivial_broadcast_f); ++i) {
+        if (buffers[i].size == 1)
+            continue;
+
+        // Require the same number of dimensions:
+        if (buffers[i].ndim != ndim)
+            return broadcast_trivial::non_trivial;
+
+        // Require all dimensions be full-size:
+        if (!std::equal(buffers[i].shape.cbegin(), buffers[i].shape.cend(), shape.cbegin()))
+            return broadcast_trivial::non_trivial;
+
+        // Check for C contiguity (but only if previous inputs were also C contiguous)
+        if (trivial_broadcast_c) {
+            ssize_t expect_stride = buffers[i].itemsize;
+            auto end = buffers[i].shape.crend();
+            for (auto shape_iter = buffers[i].shape.crbegin(), stride_iter = buffers[i].strides.crbegin();
+                    trivial_broadcast_c && shape_iter != end; ++shape_iter, ++stride_iter) {
+                if (expect_stride == *stride_iter)
+                    expect_stride *= *shape_iter;
+                else
+                    trivial_broadcast_c = false;
+            }
+        }
+
+        // Check for Fortran contiguity (if previous inputs were also F contiguous)
+        if (trivial_broadcast_f) {
+            ssize_t expect_stride = buffers[i].itemsize;
+            auto end = buffers[i].shape.cend();
+            for (auto shape_iter = buffers[i].shape.cbegin(), stride_iter = buffers[i].strides.cbegin();
+                    trivial_broadcast_f && shape_iter != end; ++shape_iter, ++stride_iter) {
+                if (expect_stride == *stride_iter)
+                    expect_stride *= *shape_iter;
+                else
+                    trivial_broadcast_f = false;
+            }
+        }
+    }
+
+    return
+        trivial_broadcast_c ? broadcast_trivial::c_trivial :
+        trivial_broadcast_f ? broadcast_trivial::f_trivial :
+        broadcast_trivial::non_trivial;
+}
+
+template <typename T>
+struct vectorize_arg {
+    static_assert(!std::is_rvalue_reference<T>::value, "Functions with rvalue reference arguments cannot be vectorized");
+    // The wrapped function gets called with this type:
+    using call_type = remove_reference_t<T>;
+    // Is this a vectorized argument?
+    static constexpr bool vectorize =
+        satisfies_any_of<call_type, std::is_arithmetic, is_complex, std::is_pod>::value &&
+        satisfies_none_of<call_type, std::is_pointer, std::is_array, is_std_array, std::is_enum>::value &&
+        (!std::is_reference<T>::value ||
+         (std::is_lvalue_reference<T>::value && std::is_const<call_type>::value));
+    // Accept this type: an array for vectorized types, otherwise the type as-is:
+    using type = conditional_t<vectorize, array_t<remove_cv_t<call_type>, array::forcecast>, T>;
+};
+
+template <typename Func, typename Return, typename... Args>
+struct vectorize_helper {
+private:
+    static constexpr size_t N = sizeof...(Args);
+    static constexpr size_t NVectorized = constexpr_sum(vectorize_arg<Args>::vectorize...);
+    static_assert(NVectorized >= 1,
+            "pybind11::vectorize(...) requires a function with at least one vectorizable argument");
+
+public:
+    template <typename T>
+    explicit vectorize_helper(T &&f) : f(std::forward<T>(f)) { }
+
+    object operator()(typename vectorize_arg<Args>::type... args) {
+        return run(args...,
+                   make_index_sequence<N>(),
+                   select_indices<vectorize_arg<Args>::vectorize...>(),
+                   make_index_sequence<NVectorized>());
+    }
+
+private:
+    remove_reference_t<Func> f;
+
+    // Internal compiler error in MSVC 19.16.27025.1 (Visual Studio 2017 15.9.4), when compiling with "/permissive-" flag
+    // when arg_call_types is manually inlined.
+    using arg_call_types = std::tuple<typename vectorize_arg<Args>::call_type...>;
+    template <size_t Index> using param_n_t = typename std::tuple_element<Index, arg_call_types>::type;
+
+    // Runs a vectorized function given arguments tuple and three index sequences:
+    //     - Index is the full set of 0 ... (N-1) argument indices;
+    //     - VIndex is the subset of argument indices with vectorized parameters, letting us access
+    //       vectorized arguments (anything not in this sequence is passed through)
+    //     - BIndex is a incremental sequence (beginning at 0) of the same size as VIndex, so that
+    //       we can store vectorized buffer_infos in an array (argument VIndex has its buffer at
+    //       index BIndex in the array).
+    template <size_t... Index, size_t... VIndex, size_t... BIndex> object run(
+            typename vectorize_arg<Args>::type &...args,
+            index_sequence<Index...> i_seq, index_sequence<VIndex...> vi_seq, index_sequence<BIndex...> bi_seq) {
+
+        // Pointers to values the function was called with; the vectorized ones set here will start
+        // out as array_t<T> pointers, but they will be changed them to T pointers before we make
+        // call the wrapped function.  Non-vectorized pointers are left as-is.
+        std::array<void *, N> params{{ &args... }};
+
+        // The array of `buffer_info`s of vectorized arguments:
+        std::array<buffer_info, NVectorized> buffers{{ reinterpret_cast<array *>(params[VIndex])->request()... }};
+
+        /* Determine dimensions parameters of output array */
+        ssize_t nd = 0;
+        std::vector<ssize_t> shape(0);
+        auto trivial = broadcast(buffers, nd, shape);
+        size_t ndim = (size_t) nd;
+
+        size_t size = std::accumulate(shape.begin(), shape.end(), (size_t) 1, std::multiplies<size_t>());
+
+        // If all arguments are 0-dimension arrays (i.e. single values) return a plain value (i.e.
+        // not wrapped in an array).
+        if (size == 1 && ndim == 0) {
+            PYBIND11_EXPAND_SIDE_EFFECTS(params[VIndex] = buffers[BIndex].ptr);
+            return cast(f(*reinterpret_cast<param_n_t<Index> *>(params[Index])...));
+        }
+
+        array_t<Return> result;
+        if (trivial == broadcast_trivial::f_trivial) result = array_t<Return, array::f_style>(shape);
+        else result = array_t<Return>(shape);
+
+        if (size == 0) return std::move(result);
+
+        /* Call the function */
+        if (trivial == broadcast_trivial::non_trivial)
+            apply_broadcast(buffers, params, result, i_seq, vi_seq, bi_seq);
+        else
+            apply_trivial(buffers, params, result.mutable_data(), size, i_seq, vi_seq, bi_seq);
+
+        return std::move(result);
+    }
+
+    template <size_t... Index, size_t... VIndex, size_t... BIndex>
+    void apply_trivial(std::array<buffer_info, NVectorized> &buffers,
+                       std::array<void *, N> &params,
+                       Return *out,
+                       size_t size,
+                       index_sequence<Index...>, index_sequence<VIndex...>, index_sequence<BIndex...>) {
+
+        // Initialize an array of mutable byte references and sizes with references set to the
+        // appropriate pointer in `params`; as we iterate, we'll increment each pointer by its size
+        // (except for singletons, which get an increment of 0).
+        std::array<std::pair<unsigned char *&, const size_t>, NVectorized> vecparams{{
+            std::pair<unsigned char *&, const size_t>(
+                    reinterpret_cast<unsigned char *&>(params[VIndex] = buffers[BIndex].ptr),
+                    buffers[BIndex].size == 1 ? 0 : sizeof(param_n_t<VIndex>)
+            )...
+        }};
+
+        for (size_t i = 0; i < size; ++i) {
+            out[i] = f(*reinterpret_cast<param_n_t<Index> *>(params[Index])...);
+            for (auto &x : vecparams) x.first += x.second;
+        }
+    }
+
+    template <size_t... Index, size_t... VIndex, size_t... BIndex>
+    void apply_broadcast(std::array<buffer_info, NVectorized> &buffers,
+                         std::array<void *, N> &params,
+                         array_t<Return> &output_array,
+                         index_sequence<Index...>, index_sequence<VIndex...>, index_sequence<BIndex...>) {
+
+        buffer_info output = output_array.request();
+        multi_array_iterator<NVectorized> input_iter(buffers, output.shape);
+
+        for (array_iterator<Return> iter = array_begin<Return>(output), end = array_end<Return>(output);
+             iter != end;
+             ++iter, ++input_iter) {
+            PYBIND11_EXPAND_SIDE_EFFECTS((
+                params[VIndex] = input_iter.template data<BIndex>()
+            ));
+            *iter = f(*reinterpret_cast<param_n_t<Index> *>(std::get<Index>(params))...);
+        }
+    }
+};
+
+template <typename Func, typename Return, typename... Args>
+vectorize_helper<Func, Return, Args...>
+vectorize_extractor(const Func &f, Return (*) (Args ...)) {
+    return detail::vectorize_helper<Func, Return, Args...>(f);
+}
+
+template <typename T, int Flags> struct handle_type_name<array_t<T, Flags>> {
+    static constexpr auto name = _("numpy.ndarray[") + npy_format_descriptor<T>::name + _("]");
+};
+
+NAMESPACE_END(detail)
+
+// Vanilla pointer vectorizer:
+template <typename Return, typename... Args>
+detail::vectorize_helper<Return (*)(Args...), Return, Args...>
+vectorize(Return (*f) (Args ...)) {
+    return detail::vectorize_helper<Return (*)(Args...), Return, Args...>(f);
+}
+
+// lambda vectorizer:
+template <typename Func, detail::enable_if_t<detail::is_lambda<Func>::value, int> = 0>
+auto vectorize(Func &&f) -> decltype(
+        detail::vectorize_extractor(std::forward<Func>(f), (detail::function_signature_t<Func> *) nullptr)) {
+    return detail::vectorize_extractor(std::forward<Func>(f), (detail::function_signature_t<Func> *) nullptr);
+}
+
+// Vectorize a class method (non-const):
+template <typename Return, typename Class, typename... Args,
+          typename Helper = detail::vectorize_helper<decltype(std::mem_fn(std::declval<Return (Class::*)(Args...)>())), Return, Class *, Args...>>
+Helper vectorize(Return (Class::*f)(Args...)) {
+    return Helper(std::mem_fn(f));
+}
+
+// Vectorize a class method (const):
+template <typename Return, typename Class, typename... Args,
+          typename Helper = detail::vectorize_helper<decltype(std::mem_fn(std::declval<Return (Class::*)(Args...) const>())), Return, const Class *, Args...>>
+Helper vectorize(Return (Class::*f)(Args...) const) {
+    return Helper(std::mem_fn(f));
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
diff --git a/3rdparty/pybind11/include/pybind11/operators.h b/3rdparty/pybind11/include/pybind11/operators.h
new file mode 100644
index 00000000..b3dd62c3
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/operators.h
@@ -0,0 +1,168 @@
+/*
+    pybind11/operator.h: Metatemplates for operator overloading
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+
+#if defined(__clang__) && !defined(__INTEL_COMPILER)
+#  pragma clang diagnostic ignored "-Wunsequenced" // multiple unsequenced modifications to 'self' (when using def(py::self OP Type()))
+#elif defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#endif
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+/// Enumeration with all supported operator types
+enum op_id : int {
+    op_add, op_sub, op_mul, op_div, op_mod, op_divmod, op_pow, op_lshift,
+    op_rshift, op_and, op_xor, op_or, op_neg, op_pos, op_abs, op_invert,
+    op_int, op_long, op_float, op_str, op_cmp, op_gt, op_ge, op_lt, op_le,
+    op_eq, op_ne, op_iadd, op_isub, op_imul, op_idiv, op_imod, op_ilshift,
+    op_irshift, op_iand, op_ixor, op_ior, op_complex, op_bool, op_nonzero,
+    op_repr, op_truediv, op_itruediv, op_hash
+};
+
+enum op_type : int {
+    op_l, /* base type on left */
+    op_r, /* base type on right */
+    op_u  /* unary operator */
+};
+
+struct self_t { };
+static const self_t self = self_t();
+
+/// Type for an unused type slot
+struct undefined_t { };
+
+/// Don't warn about an unused variable
+inline self_t __self() { return self; }
+
+/// base template of operator implementations
+template <op_id, op_type, typename B, typename L, typename R> struct op_impl { };
+
+/// Operator implementation generator
+template <op_id id, op_type ot, typename L, typename R> struct op_ {
+    template <typename Class, typename... Extra> void execute(Class &cl, const Extra&... extra) const {
+        using Base = typename Class::type;
+        using L_type = conditional_t<std::is_same<L, self_t>::value, Base, L>;
+        using R_type = conditional_t<std::is_same<R, self_t>::value, Base, R>;
+        using op = op_impl<id, ot, Base, L_type, R_type>;
+        cl.def(op::name(), &op::execute, is_operator(), extra...);
+        #if PY_MAJOR_VERSION < 3
+        if (id == op_truediv || id == op_itruediv)
+            cl.def(id == op_itruediv ? "__idiv__" : ot == op_l ? "__div__" : "__rdiv__",
+                    &op::execute, is_operator(), extra...);
+        #endif
+    }
+    template <typename Class, typename... Extra> void execute_cast(Class &cl, const Extra&... extra) const {
+        using Base = typename Class::type;
+        using L_type = conditional_t<std::is_same<L, self_t>::value, Base, L>;
+        using R_type = conditional_t<std::is_same<R, self_t>::value, Base, R>;
+        using op = op_impl<id, ot, Base, L_type, R_type>;
+        cl.def(op::name(), &op::execute_cast, is_operator(), extra...);
+        #if PY_MAJOR_VERSION < 3
+        if (id == op_truediv || id == op_itruediv)
+            cl.def(id == op_itruediv ? "__idiv__" : ot == op_l ? "__div__" : "__rdiv__",
+                    &op::execute, is_operator(), extra...);
+        #endif
+    }
+};
+
+#define PYBIND11_BINARY_OPERATOR(id, rid, op, expr)                                    \
+template <typename B, typename L, typename R> struct op_impl<op_##id, op_l, B, L, R> { \
+    static char const* name() { return "__" #id "__"; }                                \
+    static auto execute(const L &l, const R &r) -> decltype(expr) { return (expr); }   \
+    static B execute_cast(const L &l, const R &r) { return B(expr); }                  \
+};                                                                                     \
+template <typename B, typename L, typename R> struct op_impl<op_##id, op_r, B, L, R> { \
+    static char const* name() { return "__" #rid "__"; }                               \
+    static auto execute(const R &r, const L &l) -> decltype(expr) { return (expr); }   \
+    static B execute_cast(const R &r, const L &l) { return B(expr); }                  \
+};                                                                                     \
+inline op_<op_##id, op_l, self_t, self_t> op(const self_t &, const self_t &) {         \
+    return op_<op_##id, op_l, self_t, self_t>();                                       \
+}                                                                                      \
+template <typename T> op_<op_##id, op_l, self_t, T> op(const self_t &, const T &) {    \
+    return op_<op_##id, op_l, self_t, T>();                                            \
+}                                                                                      \
+template <typename T> op_<op_##id, op_r, T, self_t> op(const T &, const self_t &) {    \
+    return op_<op_##id, op_r, T, self_t>();                                            \
+}
+
+#define PYBIND11_INPLACE_OPERATOR(id, op, expr)                                        \
+template <typename B, typename L, typename R> struct op_impl<op_##id, op_l, B, L, R> { \
+    static char const* name() { return "__" #id "__"; }                                \
+    static auto execute(L &l, const R &r) -> decltype(expr) { return expr; }           \
+    static B execute_cast(L &l, const R &r) { return B(expr); }                        \
+};                                                                                     \
+template <typename T> op_<op_##id, op_l, self_t, T> op(const self_t &, const T &) {    \
+    return op_<op_##id, op_l, self_t, T>();                                            \
+}
+
+#define PYBIND11_UNARY_OPERATOR(id, op, expr)                                          \
+template <typename B, typename L> struct op_impl<op_##id, op_u, B, L, undefined_t> {   \
+    static char const* name() { return "__" #id "__"; }                                \
+    static auto execute(const L &l) -> decltype(expr) { return expr; }                 \
+    static B execute_cast(const L &l) { return B(expr); }                              \
+};                                                                                     \
+inline op_<op_##id, op_u, self_t, undefined_t> op(const self_t &) {                    \
+    return op_<op_##id, op_u, self_t, undefined_t>();                                  \
+}
+
+PYBIND11_BINARY_OPERATOR(sub,       rsub,         operator-,    l - r)
+PYBIND11_BINARY_OPERATOR(add,       radd,         operator+,    l + r)
+PYBIND11_BINARY_OPERATOR(mul,       rmul,         operator*,    l * r)
+PYBIND11_BINARY_OPERATOR(truediv,   rtruediv,     operator/,    l / r)
+PYBIND11_BINARY_OPERATOR(mod,       rmod,         operator%,    l % r)
+PYBIND11_BINARY_OPERATOR(lshift,    rlshift,      operator<<,   l << r)
+PYBIND11_BINARY_OPERATOR(rshift,    rrshift,      operator>>,   l >> r)
+PYBIND11_BINARY_OPERATOR(and,       rand,         operator&,    l & r)
+PYBIND11_BINARY_OPERATOR(xor,       rxor,         operator^,    l ^ r)
+PYBIND11_BINARY_OPERATOR(eq,        eq,           operator==,   l == r)
+PYBIND11_BINARY_OPERATOR(ne,        ne,           operator!=,   l != r)
+PYBIND11_BINARY_OPERATOR(or,        ror,          operator|,    l | r)
+PYBIND11_BINARY_OPERATOR(gt,        lt,           operator>,    l > r)
+PYBIND11_BINARY_OPERATOR(ge,        le,           operator>=,   l >= r)
+PYBIND11_BINARY_OPERATOR(lt,        gt,           operator<,    l < r)
+PYBIND11_BINARY_OPERATOR(le,        ge,           operator<=,   l <= r)
+//PYBIND11_BINARY_OPERATOR(pow,       rpow,         pow,          std::pow(l,  r))
+PYBIND11_INPLACE_OPERATOR(iadd,     operator+=,   l += r)
+PYBIND11_INPLACE_OPERATOR(isub,     operator-=,   l -= r)
+PYBIND11_INPLACE_OPERATOR(imul,     operator*=,   l *= r)
+PYBIND11_INPLACE_OPERATOR(itruediv, operator/=,   l /= r)
+PYBIND11_INPLACE_OPERATOR(imod,     operator%=,   l %= r)
+PYBIND11_INPLACE_OPERATOR(ilshift,  operator<<=,  l <<= r)
+PYBIND11_INPLACE_OPERATOR(irshift,  operator>>=,  l >>= r)
+PYBIND11_INPLACE_OPERATOR(iand,     operator&=,   l &= r)
+PYBIND11_INPLACE_OPERATOR(ixor,     operator^=,   l ^= r)
+PYBIND11_INPLACE_OPERATOR(ior,      operator|=,   l |= r)
+PYBIND11_UNARY_OPERATOR(neg,        operator-,    -l)
+PYBIND11_UNARY_OPERATOR(pos,        operator+,    +l)
+PYBIND11_UNARY_OPERATOR(abs,        abs,          std::abs(l))
+PYBIND11_UNARY_OPERATOR(hash,       hash,         std::hash<L>()(l))
+PYBIND11_UNARY_OPERATOR(invert,     operator~,    (~l))
+PYBIND11_UNARY_OPERATOR(bool,       operator!,    !!l)
+PYBIND11_UNARY_OPERATOR(int,        int_,         (int) l)
+PYBIND11_UNARY_OPERATOR(float,      float_,       (double) l)
+
+#undef PYBIND11_BINARY_OPERATOR
+#undef PYBIND11_INPLACE_OPERATOR
+#undef PYBIND11_UNARY_OPERATOR
+NAMESPACE_END(detail)
+
+using detail::self;
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
+
+#if defined(_MSC_VER)
+#  pragma warning(pop)
+#endif
diff --git a/3rdparty/pybind11/include/pybind11/options.h b/3rdparty/pybind11/include/pybind11/options.h
new file mode 100644
index 00000000..cc1e1f6f
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/options.h
@@ -0,0 +1,65 @@
+/*
+    pybind11/options.h: global settings that are configurable at runtime.
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "detail/common.h"
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+class options {
+public:
+
+    // Default RAII constructor, which leaves settings as they currently are.
+    options() : previous_state(global_state()) {}
+
+    // Class is non-copyable.
+    options(const options&) = delete;
+    options& operator=(const options&) = delete;
+
+    // Destructor, which restores settings that were in effect before.
+    ~options() {
+        global_state() = previous_state;
+    }
+
+    // Setter methods (affect the global state):
+
+    options& disable_user_defined_docstrings() & { global_state().show_user_defined_docstrings = false; return *this; }
+
+    options& enable_user_defined_docstrings() & { global_state().show_user_defined_docstrings = true; return *this; }
+
+    options& disable_function_signatures() & { global_state().show_function_signatures = false; return *this; }
+
+    options& enable_function_signatures() & { global_state().show_function_signatures = true; return *this; }
+
+    // Getter methods (return the global state):
+
+    static bool show_user_defined_docstrings() { return global_state().show_user_defined_docstrings; }
+
+    static bool show_function_signatures() { return global_state().show_function_signatures; }
+
+    // This type is not meant to be allocated on the heap.
+    void* operator new(size_t) = delete;
+
+private:
+
+    struct state {
+        bool show_user_defined_docstrings = true;  //< Include user-supplied texts in docstrings.
+        bool show_function_signatures = true;      //< Include auto-generated function signatures in docstrings.
+    };
+
+    static state &global_state() {
+        static state instance;
+        return instance;
+    }
+
+    state previous_state;
+};
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/pybind11.h b/3rdparty/pybind11/include/pybind11/pybind11.h
new file mode 100644
index 00000000..d95d61f7
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/pybind11.h
@@ -0,0 +1,2183 @@
+/*
+    pybind11/pybind11.h: Main header file of the C++11 python
+    binding generator library
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#if defined(__INTEL_COMPILER)
+#  pragma warning push
+#  pragma warning disable 68    // integer conversion resulted in a change of sign
+#  pragma warning disable 186   // pointless comparison of unsigned integer with zero
+#  pragma warning disable 878   // incompatible exception specifications
+#  pragma warning disable 1334  // the "template" keyword used for syntactic disambiguation may only be used within a template
+#  pragma warning disable 1682  // implicit conversion of a 64-bit integral type to a smaller integral type (potential portability problem)
+#  pragma warning disable 1786  // function "strdup" was declared deprecated
+#  pragma warning disable 1875  // offsetof applied to non-POD (Plain Old Data) types is nonstandard
+#  pragma warning disable 2196  // warning #2196: routine is both "inline" and "noinline"
+#elif defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable: 4100) // warning C4100: Unreferenced formal parameter
+#  pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#  pragma warning(disable: 4512) // warning C4512: Assignment operator was implicitly defined as deleted
+#  pragma warning(disable: 4800) // warning C4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
+#  pragma warning(disable: 4996) // warning C4996: The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name
+#  pragma warning(disable: 4702) // warning C4702: unreachable code
+#  pragma warning(disable: 4522) // warning C4522: multiple assignment operators specified
+#elif defined(__GNUG__) && !defined(__clang__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wunused-but-set-parameter"
+#  pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#  pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#  pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#  pragma GCC diagnostic ignored "-Wattributes"
+#  if __GNUC__ >= 7
+#    pragma GCC diagnostic ignored "-Wnoexcept-type"
+#  endif
+#endif
+
+#include "attr.h"
+#include "options.h"
+#include "detail/class.h"
+#include "detail/init.h"
+
+#if defined(__GNUG__) && !defined(__clang__)
+#  include <cxxabi.h>
+#endif
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+/// Wraps an arbitrary C++ function/method/lambda function/.. into a callable Python object
+class cpp_function : public function {
+public:
+    cpp_function() { }
+    cpp_function(std::nullptr_t) { }
+
+    /// Construct a cpp_function from a vanilla function pointer
+    template <typename Return, typename... Args, typename... Extra>
+    cpp_function(Return (*f)(Args...), const Extra&... extra) {
+        initialize(f, f, extra...);
+    }
+
+    /// Construct a cpp_function from a lambda function (possibly with internal state)
+    template <typename Func, typename... Extra,
+              typename = detail::enable_if_t<detail::is_lambda<Func>::value>>
+    cpp_function(Func &&f, const Extra&... extra) {
+        initialize(std::forward<Func>(f),
+                   (detail::function_signature_t<Func> *) nullptr, extra...);
+    }
+
+    /// Construct a cpp_function from a class method (non-const)
+    template <typename Return, typename Class, typename... Arg, typename... Extra>
+    cpp_function(Return (Class::*f)(Arg...), const Extra&... extra) {
+        initialize([f](Class *c, Arg... args) -> Return { return (c->*f)(args...); },
+                   (Return (*) (Class *, Arg...)) nullptr, extra...);
+    }
+
+    /// Construct a cpp_function from a class method (const)
+    template <typename Return, typename Class, typename... Arg, typename... Extra>
+    cpp_function(Return (Class::*f)(Arg...) const, const Extra&... extra) {
+        initialize([f](const Class *c, Arg... args) -> Return { return (c->*f)(args...); },
+                   (Return (*)(const Class *, Arg ...)) nullptr, extra...);
+    }
+
+    /// Return the function name
+    object name() const { return attr("__name__"); }
+
+protected:
+    /// Space optimization: don't inline this frequently instantiated fragment
+    PYBIND11_NOINLINE detail::function_record *make_function_record() {
+        return new detail::function_record();
+    }
+
+    /// Special internal constructor for functors, lambda functions, etc.
+    template <typename Func, typename Return, typename... Args, typename... Extra>
+    void initialize(Func &&f, Return (*)(Args...), const Extra&... extra) {
+        using namespace detail;
+        struct capture { remove_reference_t<Func> f; };
+
+        /* Store the function including any extra state it might have (e.g. a lambda capture object) */
+        auto rec = make_function_record();
+
+        /* Store the capture object directly in the function record if there is enough space */
+        if (sizeof(capture) <= sizeof(rec->data)) {
+            /* Without these pragmas, GCC warns that there might not be
+               enough space to use the placement new operator. However, the
+               'if' statement above ensures that this is the case. */
+#if defined(__GNUG__) && !defined(__clang__) && __GNUC__ >= 6
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wplacement-new"
+#endif
+            new ((capture *) &rec->data) capture { std::forward<Func>(f) };
+#if defined(__GNUG__) && !defined(__clang__) && __GNUC__ >= 6
+#  pragma GCC diagnostic pop
+#endif
+            if (!std::is_trivially_destructible<Func>::value)
+                rec->free_data = [](function_record *r) { ((capture *) &r->data)->~capture(); };
+        } else {
+            rec->data[0] = new capture { std::forward<Func>(f) };
+            rec->free_data = [](function_record *r) { delete ((capture *) r->data[0]); };
+        }
+
+        /* Type casters for the function arguments and return value */
+        using cast_in = argument_loader<Args...>;
+        using cast_out = make_caster<
+            conditional_t<std::is_void<Return>::value, void_type, Return>
+        >;
+
+        static_assert(expected_num_args<Extra...>(sizeof...(Args), cast_in::has_args, cast_in::has_kwargs),
+                      "The number of argument annotations does not match the number of function arguments");
+
+        /* Dispatch code which converts function arguments and performs the actual function call */
+        rec->impl = [](function_call &call) -> handle {
+            cast_in args_converter;
+
+            /* Try to cast the function arguments into the C++ domain */
+            if (!args_converter.load_args(call))
+                return PYBIND11_TRY_NEXT_OVERLOAD;
+
+            /* Invoke call policy pre-call hook */
+            process_attributes<Extra...>::precall(call);
+
+            /* Get a pointer to the capture object */
+            auto data = (sizeof(capture) <= sizeof(call.func.data)
+                         ? &call.func.data : call.func.data[0]);
+            capture *cap = const_cast<capture *>(reinterpret_cast<const capture *>(data));
+
+            /* Override policy for rvalues -- usually to enforce rvp::move on an rvalue */
+            return_value_policy policy = return_value_policy_override<Return>::policy(call.func.policy);
+
+            /* Function scope guard -- defaults to the compile-to-nothing `void_type` */
+            using Guard = extract_guard_t<Extra...>;
+
+            /* Perform the function call */
+            handle result = cast_out::cast(
+                std::move(args_converter).template call<Return, Guard>(cap->f), policy, call.parent);
+
+            /* Invoke call policy post-call hook */
+            process_attributes<Extra...>::postcall(call, result);
+
+            return result;
+        };
+
+        /* Process any user-provided function attributes */
+        process_attributes<Extra...>::init(extra..., rec);
+
+        /* Generate a readable signature describing the function's arguments and return value types */
+        static constexpr auto signature = _("(") + cast_in::arg_names + _(") -> ") + cast_out::name;
+        PYBIND11_DESCR_CONSTEXPR auto types = decltype(signature)::types();
+
+        /* Register the function with Python from generic (non-templated) code */
+        initialize_generic(rec, signature.text, types.data(), sizeof...(Args));
+
+        if (cast_in::has_args) rec->has_args = true;
+        if (cast_in::has_kwargs) rec->has_kwargs = true;
+
+        /* Stash some additional information used by an important optimization in 'functional.h' */
+        using FunctionType = Return (*)(Args...);
+        constexpr bool is_function_ptr =
+            std::is_convertible<Func, FunctionType>::value &&
+            sizeof(capture) == sizeof(void *);
+        if (is_function_ptr) {
+            rec->is_stateless = true;
+            rec->data[1] = const_cast<void *>(reinterpret_cast<const void *>(&typeid(FunctionType)));
+        }
+    }
+
+    /// Register a function call with Python (generic non-templated code goes here)
+    void initialize_generic(detail::function_record *rec, const char *text,
+                            const std::type_info *const *types, size_t args) {
+
+        /* Create copies of all referenced C-style strings */
+        rec->name = strdup(rec->name ? rec->name : "");
+        if (rec->doc) rec->doc = strdup(rec->doc);
+        for (auto &a: rec->args) {
+            if (a.name)
+                a.name = strdup(a.name);
+            if (a.descr)
+                a.descr = strdup(a.descr);
+            else if (a.value)
+                a.descr = strdup(a.value.attr("__repr__")().cast<std::string>().c_str());
+        }
+
+        rec->is_constructor = !strcmp(rec->name, "__init__") || !strcmp(rec->name, "__setstate__");
+
+#if !defined(NDEBUG) && !defined(PYBIND11_DISABLE_NEW_STYLE_INIT_WARNING)
+        if (rec->is_constructor && !rec->is_new_style_constructor) {
+            const auto class_name = std::string(((PyTypeObject *) rec->scope.ptr())->tp_name);
+            const auto func_name = std::string(rec->name);
+            PyErr_WarnEx(
+                PyExc_FutureWarning,
+                ("pybind11-bound class '" + class_name + "' is using an old-style "
+                 "placement-new '" + func_name + "' which has been deprecated. See "
+                 "the upgrade guide in pybind11's docs. This message is only visible "
+                 "when compiled in debug mode.").c_str(), 0
+            );
+        }
+#endif
+
+        /* Generate a proper function signature */
+        std::string signature;
+        size_t type_index = 0, arg_index = 0;
+        for (auto *pc = text; *pc != '\0'; ++pc) {
+            const auto c = *pc;
+
+            if (c == '{') {
+                // Write arg name for everything except *args and **kwargs.
+                if (*(pc + 1) == '*')
+                    continue;
+
+                if (arg_index < rec->args.size() && rec->args[arg_index].name) {
+                    signature += rec->args[arg_index].name;
+                } else if (arg_index == 0 && rec->is_method) {
+                    signature += "self";
+                } else {
+                    signature += "arg" + std::to_string(arg_index - (rec->is_method ? 1 : 0));
+                }
+                signature += ": ";
+            } else if (c == '}') {
+                // Write default value if available.
+                if (arg_index < rec->args.size() && rec->args[arg_index].descr) {
+                    signature += " = ";
+                    signature += rec->args[arg_index].descr;
+                }
+                arg_index++;
+            } else if (c == '%') {
+                const std::type_info *t = types[type_index++];
+                if (!t)
+                    pybind11_fail("Internal error while parsing type signature (1)");
+                if (auto tinfo = detail::get_type_info(*t)) {
+                    handle th((PyObject *) tinfo->type);
+                    signature +=
+                        th.attr("__module__").cast<std::string>() + "." +
+                        th.attr("__qualname__").cast<std::string>(); // Python 3.3+, but we backport it to earlier versions
+                } else if (rec->is_new_style_constructor && arg_index == 0) {
+                    // A new-style `__init__` takes `self` as `value_and_holder`.
+                    // Rewrite it to the proper class type.
+                    signature +=
+                        rec->scope.attr("__module__").cast<std::string>() + "." +
+                        rec->scope.attr("__qualname__").cast<std::string>();
+                } else {
+                    std::string tname(t->name());
+                    detail::clean_type_id(tname);
+                    signature += tname;
+                }
+            } else {
+                signature += c;
+            }
+        }
+        if (arg_index != args || types[type_index] != nullptr)
+            pybind11_fail("Internal error while parsing type signature (2)");
+
+#if PY_MAJOR_VERSION < 3
+        if (strcmp(rec->name, "__next__") == 0) {
+            std::free(rec->name);
+            rec->name = strdup("next");
+        } else if (strcmp(rec->name, "__bool__") == 0) {
+            std::free(rec->name);
+            rec->name = strdup("__nonzero__");
+        }
+#endif
+        rec->signature = strdup(signature.c_str());
+        rec->args.shrink_to_fit();
+        rec->nargs = (std::uint16_t) args;
+
+        if (rec->sibling && PYBIND11_INSTANCE_METHOD_CHECK(rec->sibling.ptr()))
+            rec->sibling = PYBIND11_INSTANCE_METHOD_GET_FUNCTION(rec->sibling.ptr());
+
+        detail::function_record *chain = nullptr, *chain_start = rec;
+        if (rec->sibling) {
+            if (PyCFunction_Check(rec->sibling.ptr())) {
+                auto rec_capsule = reinterpret_borrow<capsule>(PyCFunction_GET_SELF(rec->sibling.ptr()));
+                chain = (detail::function_record *) rec_capsule;
+                /* Never append a method to an overload chain of a parent class;
+                   instead, hide the parent's overloads in this case */
+                if (!chain->scope.is(rec->scope))
+                    chain = nullptr;
+            }
+            // Don't trigger for things like the default __init__, which are wrapper_descriptors that we are intentionally replacing
+            else if (!rec->sibling.is_none() && rec->name[0] != '_')
+                pybind11_fail("Cannot overload existing non-function object \"" + std::string(rec->name) +
+                        "\" with a function of the same name");
+        }
+
+        if (!chain) {
+            /* No existing overload was found, create a new function object */
+            rec->def = new PyMethodDef();
+            std::memset(rec->def, 0, sizeof(PyMethodDef));
+            rec->def->ml_name = rec->name;
+            rec->def->ml_meth = reinterpret_cast<PyCFunction>(reinterpret_cast<void (*) (void)>(*dispatcher));
+            rec->def->ml_flags = METH_VARARGS | METH_KEYWORDS;
+
+            capsule rec_capsule(rec, [](void *ptr) {
+                destruct((detail::function_record *) ptr);
+            });
+
+            object scope_module;
+            if (rec->scope) {
+                if (hasattr(rec->scope, "__module__")) {
+                    scope_module = rec->scope.attr("__module__");
+                } else if (hasattr(rec->scope, "__name__")) {
+                    scope_module = rec->scope.attr("__name__");
+                }
+            }
+
+            m_ptr = PyCFunction_NewEx(rec->def, rec_capsule.ptr(), scope_module.ptr());
+            if (!m_ptr)
+                pybind11_fail("cpp_function::cpp_function(): Could not allocate function object");
+        } else {
+            /* Append at the end of the overload chain */
+            m_ptr = rec->sibling.ptr();
+            inc_ref();
+            chain_start = chain;
+            if (chain->is_method != rec->is_method)
+                pybind11_fail("overloading a method with both static and instance methods is not supported; "
+                    #if defined(NDEBUG)
+                        "compile in debug mode for more details"
+                    #else
+                        "error while attempting to bind " + std::string(rec->is_method ? "instance" : "static") + " method " +
+                        std::string(pybind11::str(rec->scope.attr("__name__"))) + "." + std::string(rec->name) + signature
+                    #endif
+                );
+            while (chain->next)
+                chain = chain->next;
+            chain->next = rec;
+        }
+
+        std::string signatures;
+        int index = 0;
+        /* Create a nice pydoc rec including all signatures and
+           docstrings of the functions in the overload chain */
+        if (chain && options::show_function_signatures()) {
+            // First a generic signature
+            signatures += rec->name;
+            signatures += "(*args, **kwargs)\n";
+            signatures += "Overloaded function.\n\n";
+        }
+        // Then specific overload signatures
+        bool first_user_def = true;
+        for (auto it = chain_start; it != nullptr; it = it->next) {
+            if (options::show_function_signatures()) {
+                if (index > 0) signatures += "\n";
+                if (chain)
+                    signatures += std::to_string(++index) + ". ";
+                signatures += rec->name;
+                signatures += it->signature;
+                signatures += "\n";
+            }
+            if (it->doc && strlen(it->doc) > 0 && options::show_user_defined_docstrings()) {
+                // If we're appending another docstring, and aren't printing function signatures, we
+                // need to append a newline first:
+                if (!options::show_function_signatures()) {
+                    if (first_user_def) first_user_def = false;
+                    else signatures += "\n";
+                }
+                if (options::show_function_signatures()) signatures += "\n";
+                signatures += it->doc;
+                if (options::show_function_signatures()) signatures += "\n";
+            }
+        }
+
+        /* Install docstring */
+        PyCFunctionObject *func = (PyCFunctionObject *) m_ptr;
+        if (func->m_ml->ml_doc)
+            std::free(const_cast<char *>(func->m_ml->ml_doc));
+        func->m_ml->ml_doc = strdup(signatures.c_str());
+
+        if (rec->is_method) {
+            m_ptr = PYBIND11_INSTANCE_METHOD_NEW(m_ptr, rec->scope.ptr());
+            if (!m_ptr)
+                pybind11_fail("cpp_function::cpp_function(): Could not allocate instance method object");
+            Py_DECREF(func);
+        }
+    }
+
+    /// When a cpp_function is GCed, release any memory allocated by pybind11
+    static void destruct(detail::function_record *rec) {
+        while (rec) {
+            detail::function_record *next = rec->next;
+            if (rec->free_data)
+                rec->free_data(rec);
+            std::free((char *) rec->name);
+            std::free((char *) rec->doc);
+            std::free((char *) rec->signature);
+            for (auto &arg: rec->args) {
+                std::free(const_cast<char *>(arg.name));
+                std::free(const_cast<char *>(arg.descr));
+                arg.value.dec_ref();
+            }
+            if (rec->def) {
+                std::free(const_cast<char *>(rec->def->ml_doc));
+                delete rec->def;
+            }
+            delete rec;
+            rec = next;
+        }
+    }
+
+    /// Main dispatch logic for calls to functions bound using pybind11
+    static PyObject *dispatcher(PyObject *self, PyObject *args_in, PyObject *kwargs_in) {
+        using namespace detail;
+
+        /* Iterator over the list of potentially admissible overloads */
+        const function_record *overloads = (function_record *) PyCapsule_GetPointer(self, nullptr),
+                              *it = overloads;
+
+        /* Need to know how many arguments + keyword arguments there are to pick the right overload */
+        const size_t n_args_in = (size_t) PyTuple_GET_SIZE(args_in);
+
+        handle parent = n_args_in > 0 ? PyTuple_GET_ITEM(args_in, 0) : nullptr,
+               result = PYBIND11_TRY_NEXT_OVERLOAD;
+
+        auto self_value_and_holder = value_and_holder();
+        if (overloads->is_constructor) {
+            const auto tinfo = get_type_info((PyTypeObject *) overloads->scope.ptr());
+            const auto pi = reinterpret_cast<instance *>(parent.ptr());
+            self_value_and_holder = pi->get_value_and_holder(tinfo, false);
+
+            if (!self_value_and_holder.type || !self_value_and_holder.inst) {
+                PyErr_SetString(PyExc_TypeError, "__init__(self, ...) called with invalid `self` argument");
+                return nullptr;
+            }
+
+            // If this value is already registered it must mean __init__ is invoked multiple times;
+            // we really can't support that in C++, so just ignore the second __init__.
+            if (self_value_and_holder.instance_registered())
+                return none().release().ptr();
+        }
+
+        try {
+            // We do this in two passes: in the first pass, we load arguments with `convert=false`;
+            // in the second, we allow conversion (except for arguments with an explicit
+            // py::arg().noconvert()).  This lets us prefer calls without conversion, with
+            // conversion as a fallback.
+            std::vector<function_call> second_pass;
+
+            // However, if there are no overloads, we can just skip the no-convert pass entirely
+            const bool overloaded = it != nullptr && it->next != nullptr;
+
+            for (; it != nullptr; it = it->next) {
+
+                /* For each overload:
+                   1. Copy all positional arguments we were given, also checking to make sure that
+                      named positional arguments weren't *also* specified via kwarg.
+                   2. If we weren't given enough, try to make up the omitted ones by checking
+                      whether they were provided by a kwarg matching the `py::arg("name")` name.  If
+                      so, use it (and remove it from kwargs; if not, see if the function binding
+                      provided a default that we can use.
+                   3. Ensure that either all keyword arguments were "consumed", or that the function
+                      takes a kwargs argument to accept unconsumed kwargs.
+                   4. Any positional arguments still left get put into a tuple (for args), and any
+                      leftover kwargs get put into a dict.
+                   5. Pack everything into a vector; if we have py::args or py::kwargs, they are an
+                      extra tuple or dict at the end of the positional arguments.
+                   6. Call the function call dispatcher (function_record::impl)
+
+                   If one of these fail, move on to the next overload and keep trying until we get a
+                   result other than PYBIND11_TRY_NEXT_OVERLOAD.
+                 */
+
+                const function_record &func = *it;
+                size_t pos_args = func.nargs;    // Number of positional arguments that we need
+                if (func.has_args) --pos_args;   // (but don't count py::args
+                if (func.has_kwargs) --pos_args; //  or py::kwargs)
+
+                if (!func.has_args && n_args_in > pos_args)
+                    continue; // Too many arguments for this overload
+
+                if (n_args_in < pos_args && func.args.size() < pos_args)
+                    continue; // Not enough arguments given, and not enough defaults to fill in the blanks
+
+                function_call call(func, parent);
+
+                size_t args_to_copy = (std::min)(pos_args, n_args_in); // Protect std::min with parentheses
+                size_t args_copied = 0;
+
+                // 0. Inject new-style `self` argument
+                if (func.is_new_style_constructor) {
+                    // The `value` may have been preallocated by an old-style `__init__`
+                    // if it was a preceding candidate for overload resolution.
+                    if (self_value_and_holder)
+                        self_value_and_holder.type->dealloc(self_value_and_holder);
+
+                    call.init_self = PyTuple_GET_ITEM(args_in, 0);
+                    call.args.push_back(reinterpret_cast<PyObject *>(&self_value_and_holder));
+                    call.args_convert.push_back(false);
+                    ++args_copied;
+                }
+
+                // 1. Copy any position arguments given.
+                bool bad_arg = false;
+                for (; args_copied < args_to_copy; ++args_copied) {
+                    const argument_record *arg_rec = args_copied < func.args.size() ? &func.args[args_copied] : nullptr;
+                    if (kwargs_in && arg_rec && arg_rec->name && PyDict_GetItemString(kwargs_in, arg_rec->name)) {
+                        bad_arg = true;
+                        break;
+                    }
+
+                    handle arg(PyTuple_GET_ITEM(args_in, args_copied));
+                    if (arg_rec && !arg_rec->none && arg.is_none()) {
+                        bad_arg = true;
+                        break;
+                    }
+                    call.args.push_back(arg);
+                    call.args_convert.push_back(arg_rec ? arg_rec->convert : true);
+                }
+                if (bad_arg)
+                    continue; // Maybe it was meant for another overload (issue #688)
+
+                // We'll need to copy this if we steal some kwargs for defaults
+                dict kwargs = reinterpret_borrow<dict>(kwargs_in);
+
+                // 2. Check kwargs and, failing that, defaults that may help complete the list
+                if (args_copied < pos_args) {
+                    bool copied_kwargs = false;
+
+                    for (; args_copied < pos_args; ++args_copied) {
+                        const auto &arg = func.args[args_copied];
+
+                        handle value;
+                        if (kwargs_in && arg.name)
+                            value = PyDict_GetItemString(kwargs.ptr(), arg.name);
+
+                        if (value) {
+                            // Consume a kwargs value
+                            if (!copied_kwargs) {
+                                kwargs = reinterpret_steal<dict>(PyDict_Copy(kwargs.ptr()));
+                                copied_kwargs = true;
+                            }
+                            PyDict_DelItemString(kwargs.ptr(), arg.name);
+                        } else if (arg.value) {
+                            value = arg.value;
+                        }
+
+                        if (value) {
+                            call.args.push_back(value);
+                            call.args_convert.push_back(arg.convert);
+                        }
+                        else
+                            break;
+                    }
+
+                    if (args_copied < pos_args)
+                        continue; // Not enough arguments, defaults, or kwargs to fill the positional arguments
+                }
+
+                // 3. Check everything was consumed (unless we have a kwargs arg)
+                if (kwargs && kwargs.size() > 0 && !func.has_kwargs)
+                    continue; // Unconsumed kwargs, but no py::kwargs argument to accept them
+
+                // 4a. If we have a py::args argument, create a new tuple with leftovers
+                if (func.has_args) {
+                    tuple extra_args;
+                    if (args_to_copy == 0) {
+                        // We didn't copy out any position arguments from the args_in tuple, so we
+                        // can reuse it directly without copying:
+                        extra_args = reinterpret_borrow<tuple>(args_in);
+                    } else if (args_copied >= n_args_in) {
+                        extra_args = tuple(0);
+                    } else {
+                        size_t args_size = n_args_in - args_copied;
+                        extra_args = tuple(args_size);
+                        for (size_t i = 0; i < args_size; ++i) {
+                            extra_args[i] = PyTuple_GET_ITEM(args_in, args_copied + i);
+                        }
+                    }
+                    call.args.push_back(extra_args);
+                    call.args_convert.push_back(false);
+                    call.args_ref = std::move(extra_args);
+                }
+
+                // 4b. If we have a py::kwargs, pass on any remaining kwargs
+                if (func.has_kwargs) {
+                    if (!kwargs.ptr())
+                        kwargs = dict(); // If we didn't get one, send an empty one
+                    call.args.push_back(kwargs);
+                    call.args_convert.push_back(false);
+                    call.kwargs_ref = std::move(kwargs);
+                }
+
+                // 5. Put everything in a vector.  Not technically step 5, we've been building it
+                // in `call.args` all along.
+                #if !defined(NDEBUG)
+                if (call.args.size() != func.nargs || call.args_convert.size() != func.nargs)
+                    pybind11_fail("Internal error: function call dispatcher inserted wrong number of arguments!");
+                #endif
+
+                std::vector<bool> second_pass_convert;
+                if (overloaded) {
+                    // We're in the first no-convert pass, so swap out the conversion flags for a
+                    // set of all-false flags.  If the call fails, we'll swap the flags back in for
+                    // the conversion-allowed call below.
+                    second_pass_convert.resize(func.nargs, false);
+                    call.args_convert.swap(second_pass_convert);
+                }
+
+                // 6. Call the function.
+                try {
+                    loader_life_support guard{};
+                    result = func.impl(call);
+                } catch (reference_cast_error &) {
+                    result = PYBIND11_TRY_NEXT_OVERLOAD;
+                }
+
+                if (result.ptr() != PYBIND11_TRY_NEXT_OVERLOAD)
+                    break;
+
+                if (overloaded) {
+                    // The (overloaded) call failed; if the call has at least one argument that
+                    // permits conversion (i.e. it hasn't been explicitly specified `.noconvert()`)
+                    // then add this call to the list of second pass overloads to try.
+                    for (size_t i = func.is_method ? 1 : 0; i < pos_args; i++) {
+                        if (second_pass_convert[i]) {
+                            // Found one: swap the converting flags back in and store the call for
+                            // the second pass.
+                            call.args_convert.swap(second_pass_convert);
+                            second_pass.push_back(std::move(call));
+                            break;
+                        }
+                    }
+                }
+            }
+
+            if (overloaded && !second_pass.empty() && result.ptr() == PYBIND11_TRY_NEXT_OVERLOAD) {
+                // The no-conversion pass finished without success, try again with conversion allowed
+                for (auto &call : second_pass) {
+                    try {
+                        loader_life_support guard{};
+                        result = call.func.impl(call);
+                    } catch (reference_cast_error &) {
+                        result = PYBIND11_TRY_NEXT_OVERLOAD;
+                    }
+
+                    if (result.ptr() != PYBIND11_TRY_NEXT_OVERLOAD) {
+                        // The error reporting logic below expects 'it' to be valid, as it would be
+                        // if we'd encountered this failure in the first-pass loop.
+                        if (!result)
+                            it = &call.func;
+                        break;
+                    }
+                }
+            }
+        } catch (error_already_set &e) {
+            e.restore();
+            return nullptr;
+#if defined(__GNUG__) && !defined(__clang__)
+        } catch ( abi::__forced_unwind& ) {
+            throw;
+#endif
+        } catch (...) {
+            /* When an exception is caught, give each registered exception
+               translator a chance to translate it to a Python exception
+               in reverse order of registration.
+
+               A translator may choose to do one of the following:
+
+                - catch the exception and call PyErr_SetString or PyErr_SetObject
+                  to set a standard (or custom) Python exception, or
+                - do nothing and let the exception fall through to the next translator, or
+                - delegate translation to the next translator by throwing a new type of exception. */
+
+            auto last_exception = std::current_exception();
+            auto &registered_exception_translators = get_internals().registered_exception_translators;
+            for (auto& translator : registered_exception_translators) {
+                try {
+                    translator(last_exception);
+                } catch (...) {
+                    last_exception = std::current_exception();
+                    continue;
+                }
+                return nullptr;
+            }
+            PyErr_SetString(PyExc_SystemError, "Exception escaped from default exception translator!");
+            return nullptr;
+        }
+
+        auto append_note_if_missing_header_is_suspected = [](std::string &msg) {
+            if (msg.find("std::") != std::string::npos) {
+                msg += "\n\n"
+                       "Did you forget to `#include <pybind11/stl.h>`? Or <pybind11/complex.h>,\n"
+                       "<pybind11/functional.h>, <pybind11/chrono.h>, etc. Some automatic\n"
+                       "conversions are optional and require extra headers to be included\n"
+                       "when compiling your pybind11 module.";
+            }
+        };
+
+        if (result.ptr() == PYBIND11_TRY_NEXT_OVERLOAD) {
+            if (overloads->is_operator)
+                return handle(Py_NotImplemented).inc_ref().ptr();
+
+            std::string msg = std::string(overloads->name) + "(): incompatible " +
+                std::string(overloads->is_constructor ? "constructor" : "function") +
+                " arguments. The following argument types are supported:\n";
+
+            int ctr = 0;
+            for (const function_record *it2 = overloads; it2 != nullptr; it2 = it2->next) {
+                msg += "    "+ std::to_string(++ctr) + ". ";
+
+                bool wrote_sig = false;
+                if (overloads->is_constructor) {
+                    // For a constructor, rewrite `(self: Object, arg0, ...) -> NoneType` as `Object(arg0, ...)`
+                    std::string sig = it2->signature;
+                    size_t start = sig.find('(') + 7; // skip "(self: "
+                    if (start < sig.size()) {
+                        // End at the , for the next argument
+                        size_t end = sig.find(", "), next = end + 2;
+                        size_t ret = sig.rfind(" -> ");
+                        // Or the ), if there is no comma:
+                        if (end >= sig.size()) next = end = sig.find(')');
+                        if (start < end && next < sig.size()) {
+                            msg.append(sig, start, end - start);
+                            msg += '(';
+                            msg.append(sig, next, ret - next);
+                            wrote_sig = true;
+                        }
+                    }
+                }
+                if (!wrote_sig) msg += it2->signature;
+
+                msg += "\n";
+            }
+            msg += "\nInvoked with: ";
+            auto args_ = reinterpret_borrow<tuple>(args_in);
+            bool some_args = false;
+            for (size_t ti = overloads->is_constructor ? 1 : 0; ti < args_.size(); ++ti) {
+                if (!some_args) some_args = true;
+                else msg += ", ";
+                msg += pybind11::repr(args_[ti]);
+            }
+            if (kwargs_in) {
+                auto kwargs = reinterpret_borrow<dict>(kwargs_in);
+                if (kwargs.size() > 0) {
+                    if (some_args) msg += "; ";
+                    msg += "kwargs: ";
+                    bool first = true;
+                    for (auto kwarg : kwargs) {
+                        if (first) first = false;
+                        else msg += ", ";
+                        msg += pybind11::str("{}={!r}").format(kwarg.first, kwarg.second);
+                    }
+                }
+            }
+
+            append_note_if_missing_header_is_suspected(msg);
+            PyErr_SetString(PyExc_TypeError, msg.c_str());
+            return nullptr;
+        } else if (!result) {
+            std::string msg = "Unable to convert function return value to a "
+                              "Python type! The signature was\n\t";
+            msg += it->signature;
+            append_note_if_missing_header_is_suspected(msg);
+            PyErr_SetString(PyExc_TypeError, msg.c_str());
+            return nullptr;
+        } else {
+            if (overloads->is_constructor && !self_value_and_holder.holder_constructed()) {
+                auto *pi = reinterpret_cast<instance *>(parent.ptr());
+                self_value_and_holder.type->init_instance(pi, nullptr);
+            }
+            return result.ptr();
+        }
+    }
+};
+
+/// Wrapper for Python extension modules
+class module : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(module, object, PyModule_Check)
+
+    /// Create a new top-level Python module with the given name and docstring
+    explicit module(const char *name, const char *doc = nullptr) {
+        if (!options::show_user_defined_docstrings()) doc = nullptr;
+#if PY_MAJOR_VERSION >= 3
+        PyModuleDef *def = new PyModuleDef();
+        std::memset(def, 0, sizeof(PyModuleDef));
+        def->m_name = name;
+        def->m_doc = doc;
+        def->m_size = -1;
+        Py_INCREF(def);
+        m_ptr = PyModule_Create(def);
+#else
+        m_ptr = Py_InitModule3(name, nullptr, doc);
+#endif
+        if (m_ptr == nullptr)
+            pybind11_fail("Internal error in module::module()");
+        inc_ref();
+    }
+
+    /** \rst
+        Create Python binding for a new function within the module scope. ``Func``
+        can be a plain C++ function, a function pointer, or a lambda function. For
+        details on the ``Extra&& ... extra`` argument, see section :ref:`extras`.
+    \endrst */
+    template <typename Func, typename... Extra>
+    module &def(const char *name_, Func &&f, const Extra& ... extra) {
+        cpp_function func(std::forward<Func>(f), name(name_), scope(*this),
+                          sibling(getattr(*this, name_, none())), extra...);
+        // NB: allow overwriting here because cpp_function sets up a chain with the intention of
+        // overwriting (and has already checked internally that it isn't overwriting non-functions).
+        add_object(name_, func, true /* overwrite */);
+        return *this;
+    }
+
+    /** \rst
+        Create and return a new Python submodule with the given name and docstring.
+        This also works recursively, i.e.
+
+        .. code-block:: cpp
+
+            py::module m("example", "pybind11 example plugin");
+            py::module m2 = m.def_submodule("sub", "A submodule of 'example'");
+            py::module m3 = m2.def_submodule("subsub", "A submodule of 'example.sub'");
+    \endrst */
+    module def_submodule(const char *name, const char *doc = nullptr) {
+        std::string full_name = std::string(PyModule_GetName(m_ptr))
+            + std::string(".") + std::string(name);
+        auto result = reinterpret_borrow<module>(PyImport_AddModule(full_name.c_str()));
+        if (doc && options::show_user_defined_docstrings())
+            result.attr("__doc__") = pybind11::str(doc);
+        attr(name) = result;
+        return result;
+    }
+
+    /// Import and return a module or throws `error_already_set`.
+    static module import(const char *name) {
+        PyObject *obj = PyImport_ImportModule(name);
+        if (!obj)
+            throw error_already_set();
+        return reinterpret_steal<module>(obj);
+    }
+
+    /// Reload the module or throws `error_already_set`.
+    void reload() {
+        PyObject *obj = PyImport_ReloadModule(ptr());
+        if (!obj)
+            throw error_already_set();
+        *this = reinterpret_steal<module>(obj);
+    }
+
+    // Adds an object to the module using the given name.  Throws if an object with the given name
+    // already exists.
+    //
+    // overwrite should almost always be false: attempting to overwrite objects that pybind11 has
+    // established will, in most cases, break things.
+    PYBIND11_NOINLINE void add_object(const char *name, handle obj, bool overwrite = false) {
+        if (!overwrite && hasattr(*this, name))
+            pybind11_fail("Error during initialization: multiple incompatible definitions with name \"" +
+                    std::string(name) + "\"");
+
+        PyModule_AddObject(ptr(), name, obj.inc_ref().ptr() /* steals a reference */);
+    }
+};
+
+/// \ingroup python_builtins
+/// Return a dictionary representing the global variables in the current execution frame,
+/// or ``__main__.__dict__`` if there is no frame (usually when the interpreter is embedded).
+inline dict globals() {
+    PyObject *p = PyEval_GetGlobals();
+    return reinterpret_borrow<dict>(p ? p : module::import("__main__").attr("__dict__").ptr());
+}
+
+NAMESPACE_BEGIN(detail)
+/// Generic support for creating new Python heap types
+class generic_type : public object {
+    template <typename...> friend class class_;
+public:
+    PYBIND11_OBJECT_DEFAULT(generic_type, object, PyType_Check)
+protected:
+    void initialize(const type_record &rec) {
+        if (rec.scope && hasattr(rec.scope, rec.name))
+            pybind11_fail("generic_type: cannot initialize type \"" + std::string(rec.name) +
+                          "\": an object with that name is already defined");
+
+        if (rec.module_local ? get_local_type_info(*rec.type) : get_global_type_info(*rec.type))
+            pybind11_fail("generic_type: type \"" + std::string(rec.name) +
+                          "\" is already registered!");
+
+        m_ptr = make_new_python_type(rec);
+
+        /* Register supplemental type information in C++ dict */
+        auto *tinfo = new detail::type_info();
+        tinfo->type = (PyTypeObject *) m_ptr;
+        tinfo->cpptype = rec.type;
+        tinfo->type_size = rec.type_size;
+        tinfo->type_align = rec.type_align;
+        tinfo->operator_new = rec.operator_new;
+        tinfo->holder_size_in_ptrs = size_in_ptrs(rec.holder_size);
+        tinfo->init_instance = rec.init_instance;
+        tinfo->dealloc = rec.dealloc;
+        tinfo->simple_type = true;
+        tinfo->simple_ancestors = true;
+        tinfo->default_holder = rec.default_holder;
+        tinfo->module_local = rec.module_local;
+
+        auto &internals = get_internals();
+        auto tindex = std::type_index(*rec.type);
+        tinfo->direct_conversions = &internals.direct_conversions[tindex];
+        if (rec.module_local)
+            registered_local_types_cpp()[tindex] = tinfo;
+        else
+            internals.registered_types_cpp[tindex] = tinfo;
+        internals.registered_types_py[(PyTypeObject *) m_ptr] = { tinfo };
+
+        if (rec.bases.size() > 1 || rec.multiple_inheritance) {
+            mark_parents_nonsimple(tinfo->type);
+            tinfo->simple_ancestors = false;
+        }
+        else if (rec.bases.size() == 1) {
+            auto parent_tinfo = get_type_info((PyTypeObject *) rec.bases[0].ptr());
+            tinfo->simple_ancestors = parent_tinfo->simple_ancestors;
+        }
+
+        if (rec.module_local) {
+            // Stash the local typeinfo and loader so that external modules can access it.
+            tinfo->module_local_load = &type_caster_generic::local_load;
+            setattr(m_ptr, PYBIND11_MODULE_LOCAL_ID, capsule(tinfo));
+        }
+    }
+
+    /// Helper function which tags all parents of a type using mult. inheritance
+    void mark_parents_nonsimple(PyTypeObject *value) {
+        auto t = reinterpret_borrow<tuple>(value->tp_bases);
+        for (handle h : t) {
+            auto tinfo2 = get_type_info((PyTypeObject *) h.ptr());
+            if (tinfo2)
+                tinfo2->simple_type = false;
+            mark_parents_nonsimple((PyTypeObject *) h.ptr());
+        }
+    }
+
+    void install_buffer_funcs(
+            buffer_info *(*get_buffer)(PyObject *, void *),
+            void *get_buffer_data) {
+        PyHeapTypeObject *type = (PyHeapTypeObject*) m_ptr;
+        auto tinfo = detail::get_type_info(&type->ht_type);
+
+        if (!type->ht_type.tp_as_buffer)
+            pybind11_fail(
+                "To be able to register buffer protocol support for the type '" +
+                std::string(tinfo->type->tp_name) +
+                "' the associated class<>(..) invocation must "
+                "include the pybind11::buffer_protocol() annotation!");
+
+        tinfo->get_buffer = get_buffer;
+        tinfo->get_buffer_data = get_buffer_data;
+    }
+
+    // rec_func must be set for either fget or fset.
+    void def_property_static_impl(const char *name,
+                                  handle fget, handle fset,
+                                  detail::function_record *rec_func) {
+        const auto is_static = rec_func && !(rec_func->is_method && rec_func->scope);
+        const auto has_doc = rec_func && rec_func->doc && pybind11::options::show_user_defined_docstrings();
+        auto property = handle((PyObject *) (is_static ? get_internals().static_property_type
+                                                       : &PyProperty_Type));
+        attr(name) = property(fget.ptr() ? fget : none(),
+                              fset.ptr() ? fset : none(),
+                              /*deleter*/none(),
+                              pybind11::str(has_doc ? rec_func->doc : ""));
+    }
+};
+
+/// Set the pointer to operator new if it exists. The cast is needed because it can be overloaded.
+template <typename T, typename = void_t<decltype(static_cast<void *(*)(size_t)>(T::operator new))>>
+void set_operator_new(type_record *r) { r->operator_new = &T::operator new; }
+
+template <typename> void set_operator_new(...) { }
+
+template <typename T, typename SFINAE = void> struct has_operator_delete : std::false_type { };
+template <typename T> struct has_operator_delete<T, void_t<decltype(static_cast<void (*)(void *)>(T::operator delete))>>
+    : std::true_type { };
+template <typename T, typename SFINAE = void> struct has_operator_delete_size : std::false_type { };
+template <typename T> struct has_operator_delete_size<T, void_t<decltype(static_cast<void (*)(void *, size_t)>(T::operator delete))>>
+    : std::true_type { };
+/// Call class-specific delete if it exists or global otherwise. Can also be an overload set.
+template <typename T, enable_if_t<has_operator_delete<T>::value, int> = 0>
+void call_operator_delete(T *p, size_t, size_t) { T::operator delete(p); }
+template <typename T, enable_if_t<!has_operator_delete<T>::value && has_operator_delete_size<T>::value, int> = 0>
+void call_operator_delete(T *p, size_t s, size_t) { T::operator delete(p, s); }
+
+inline void call_operator_delete(void *p, size_t s, size_t a) {
+    (void)s; (void)a;
+    #if defined(__cpp_aligned_new) && (!defined(_MSC_VER) || _MSC_VER >= 1912)
+        if (a > __STDCPP_DEFAULT_NEW_ALIGNMENT__) {
+            #ifdef __cpp_sized_deallocation
+                ::operator delete(p, s, std::align_val_t(a));
+            #else
+                ::operator delete(p, std::align_val_t(a));
+            #endif
+            return;
+        }
+    #endif
+    #ifdef __cpp_sized_deallocation
+        ::operator delete(p, s);
+    #else
+        ::operator delete(p);
+    #endif
+}
+
+NAMESPACE_END(detail)
+
+/// Given a pointer to a member function, cast it to its `Derived` version.
+/// Forward everything else unchanged.
+template <typename /*Derived*/, typename F>
+auto method_adaptor(F &&f) -> decltype(std::forward<F>(f)) { return std::forward<F>(f); }
+
+template <typename Derived, typename Return, typename Class, typename... Args>
+auto method_adaptor(Return (Class::*pmf)(Args...)) -> Return (Derived::*)(Args...) {
+    static_assert(detail::is_accessible_base_of<Class, Derived>::value,
+        "Cannot bind an inaccessible base class method; use a lambda definition instead");
+    return pmf;
+}
+
+template <typename Derived, typename Return, typename Class, typename... Args>
+auto method_adaptor(Return (Class::*pmf)(Args...) const) -> Return (Derived::*)(Args...) const {
+    static_assert(detail::is_accessible_base_of<Class, Derived>::value,
+        "Cannot bind an inaccessible base class method; use a lambda definition instead");
+    return pmf;
+}
+
+template <typename type_, typename... options>
+class class_ : public detail::generic_type {
+    template <typename T> using is_holder = detail::is_holder_type<type_, T>;
+    template <typename T> using is_subtype = detail::is_strict_base_of<type_, T>;
+    template <typename T> using is_base = detail::is_strict_base_of<T, type_>;
+    // struct instead of using here to help MSVC:
+    template <typename T> struct is_valid_class_option :
+        detail::any_of<is_holder<T>, is_subtype<T>, is_base<T>> {};
+
+public:
+    using type = type_;
+    using type_alias = detail::exactly_one_t<is_subtype, void, options...>;
+    constexpr static bool has_alias = !std::is_void<type_alias>::value;
+    using holder_type = detail::exactly_one_t<is_holder, std::unique_ptr<type>, options...>;
+
+    static_assert(detail::all_of<is_valid_class_option<options>...>::value,
+            "Unknown/invalid class_ template parameters provided");
+
+    static_assert(!has_alias || std::is_polymorphic<type>::value,
+            "Cannot use an alias class with a non-polymorphic type");
+
+    PYBIND11_OBJECT(class_, generic_type, PyType_Check)
+
+    template <typename... Extra>
+    class_(handle scope, const char *name, const Extra &... extra) {
+        using namespace detail;
+
+        // MI can only be specified via class_ template options, not constructor parameters
+        static_assert(
+            none_of<is_pyobject<Extra>...>::value || // no base class arguments, or:
+            (   constexpr_sum(is_pyobject<Extra>::value...) == 1 && // Exactly one base
+                constexpr_sum(is_base<options>::value...)   == 0 && // no template option bases
+                none_of<std::is_same<multiple_inheritance, Extra>...>::value), // no multiple_inheritance attr
+            "Error: multiple inheritance bases must be specified via class_ template options");
+
+        type_record record;
+        record.scope = scope;
+        record.name = name;
+        record.type = &typeid(type);
+        record.type_size = sizeof(conditional_t<has_alias, type_alias, type>);
+        record.type_align = alignof(conditional_t<has_alias, type_alias, type>&);
+        record.holder_size = sizeof(holder_type);
+        record.init_instance = init_instance;
+        record.dealloc = dealloc;
+        record.default_holder = detail::is_instantiation<std::unique_ptr, holder_type>::value;
+
+        set_operator_new<type>(&record);
+
+        /* Register base classes specified via template arguments to class_, if any */
+        PYBIND11_EXPAND_SIDE_EFFECTS(add_base<options>(record));
+
+        /* Process optional arguments, if any */
+        process_attributes<Extra...>::init(extra..., &record);
+
+        generic_type::initialize(record);
+
+        if (has_alias) {
+            auto &instances = record.module_local ? registered_local_types_cpp() : get_internals().registered_types_cpp;
+            instances[std::type_index(typeid(type_alias))] = instances[std::type_index(typeid(type))];
+        }
+    }
+
+    template <typename Base, detail::enable_if_t<is_base<Base>::value, int> = 0>
+    static void add_base(detail::type_record &rec) {
+        rec.add_base(typeid(Base), [](void *src) -> void * {
+            return static_cast<Base *>(reinterpret_cast<type *>(src));
+        });
+    }
+
+    template <typename Base, detail::enable_if_t<!is_base<Base>::value, int> = 0>
+    static void add_base(detail::type_record &) { }
+
+    template <typename Func, typename... Extra>
+    class_ &def(const char *name_, Func&& f, const Extra&... extra) {
+        cpp_function cf(method_adaptor<type>(std::forward<Func>(f)), name(name_), is_method(*this),
+                        sibling(getattr(*this, name_, none())), extra...);
+        attr(cf.name()) = cf;
+        return *this;
+    }
+
+    template <typename Func, typename... Extra> class_ &
+    def_static(const char *name_, Func &&f, const Extra&... extra) {
+        static_assert(!std::is_member_function_pointer<Func>::value,
+                "def_static(...) called with a non-static member function pointer");
+        cpp_function cf(std::forward<Func>(f), name(name_), scope(*this),
+                        sibling(getattr(*this, name_, none())), extra...);
+        attr(cf.name()) = staticmethod(cf);
+        return *this;
+    }
+
+    template <detail::op_id id, detail::op_type ot, typename L, typename R, typename... Extra>
+    class_ &def(const detail::op_<id, ot, L, R> &op, const Extra&... extra) {
+        op.execute(*this, extra...);
+        return *this;
+    }
+
+    template <detail::op_id id, detail::op_type ot, typename L, typename R, typename... Extra>
+    class_ & def_cast(const detail::op_<id, ot, L, R> &op, const Extra&... extra) {
+        op.execute_cast(*this, extra...);
+        return *this;
+    }
+
+    template <typename... Args, typename... Extra>
+    class_ &def(const detail::initimpl::constructor<Args...> &init, const Extra&... extra) {
+        init.execute(*this, extra...);
+        return *this;
+    }
+
+    template <typename... Args, typename... Extra>
+    class_ &def(const detail::initimpl::alias_constructor<Args...> &init, const Extra&... extra) {
+        init.execute(*this, extra...);
+        return *this;
+    }
+
+    template <typename... Args, typename... Extra>
+    class_ &def(detail::initimpl::factory<Args...> &&init, const Extra&... extra) {
+        std::move(init).execute(*this, extra...);
+        return *this;
+    }
+
+    template <typename... Args, typename... Extra>
+    class_ &def(detail::initimpl::pickle_factory<Args...> &&pf, const Extra &...extra) {
+        std::move(pf).execute(*this, extra...);
+        return *this;
+    }
+
+    template <typename Func> class_& def_buffer(Func &&func) {
+        struct capture { Func func; };
+        capture *ptr = new capture { std::forward<Func>(func) };
+        install_buffer_funcs([](PyObject *obj, void *ptr) -> buffer_info* {
+            detail::make_caster<type> caster;
+            if (!caster.load(obj, false))
+                return nullptr;
+            return new buffer_info(((capture *) ptr)->func(caster));
+        }, ptr);
+        return *this;
+    }
+
+    template <typename Return, typename Class, typename... Args>
+    class_ &def_buffer(Return (Class::*func)(Args...)) {
+        return def_buffer([func] (type &obj) { return (obj.*func)(); });
+    }
+
+    template <typename Return, typename Class, typename... Args>
+    class_ &def_buffer(Return (Class::*func)(Args...) const) {
+        return def_buffer([func] (const type &obj) { return (obj.*func)(); });
+    }
+
+    template <typename C, typename D, typename... Extra>
+    class_ &def_readwrite(const char *name, D C::*pm, const Extra&... extra) {
+        static_assert(std::is_same<C, type>::value || std::is_base_of<C, type>::value, "def_readwrite() requires a class member (or base class member)");
+        cpp_function fget([pm](const type &c) -> const D &{ return c.*pm; }, is_method(*this)),
+                     fset([pm](type &c, const D &value) { c.*pm = value; }, is_method(*this));
+        def_property(name, fget, fset, return_value_policy::reference_internal, extra...);
+        return *this;
+    }
+
+    template <typename C, typename D, typename... Extra>
+    class_ &def_readonly(const char *name, const D C::*pm, const Extra& ...extra) {
+        static_assert(std::is_same<C, type>::value || std::is_base_of<C, type>::value, "def_readonly() requires a class member (or base class member)");
+        cpp_function fget([pm](const type &c) -> const D &{ return c.*pm; }, is_method(*this));
+        def_property_readonly(name, fget, return_value_policy::reference_internal, extra...);
+        return *this;
+    }
+
+    template <typename D, typename... Extra>
+    class_ &def_readwrite_static(const char *name, D *pm, const Extra& ...extra) {
+        cpp_function fget([pm](object) -> const D &{ return *pm; }, scope(*this)),
+                     fset([pm](object, const D &value) { *pm = value; }, scope(*this));
+        def_property_static(name, fget, fset, return_value_policy::reference, extra...);
+        return *this;
+    }
+
+    template <typename D, typename... Extra>
+    class_ &def_readonly_static(const char *name, const D *pm, const Extra& ...extra) {
+        cpp_function fget([pm](object) -> const D &{ return *pm; }, scope(*this));
+        def_property_readonly_static(name, fget, return_value_policy::reference, extra...);
+        return *this;
+    }
+
+    /// Uses return_value_policy::reference_internal by default
+    template <typename Getter, typename... Extra>
+    class_ &def_property_readonly(const char *name, const Getter &fget, const Extra& ...extra) {
+        return def_property_readonly(name, cpp_function(method_adaptor<type>(fget)),
+                                     return_value_policy::reference_internal, extra...);
+    }
+
+    /// Uses cpp_function's return_value_policy by default
+    template <typename... Extra>
+    class_ &def_property_readonly(const char *name, const cpp_function &fget, const Extra& ...extra) {
+        return def_property(name, fget, nullptr, extra...);
+    }
+
+    /// Uses return_value_policy::reference by default
+    template <typename Getter, typename... Extra>
+    class_ &def_property_readonly_static(const char *name, const Getter &fget, const Extra& ...extra) {
+        return def_property_readonly_static(name, cpp_function(fget), return_value_policy::reference, extra...);
+    }
+
+    /// Uses cpp_function's return_value_policy by default
+    template <typename... Extra>
+    class_ &def_property_readonly_static(const char *name, const cpp_function &fget, const Extra& ...extra) {
+        return def_property_static(name, fget, nullptr, extra...);
+    }
+
+    /// Uses return_value_policy::reference_internal by default
+    template <typename Getter, typename Setter, typename... Extra>
+    class_ &def_property(const char *name, const Getter &fget, const Setter &fset, const Extra& ...extra) {
+        return def_property(name, fget, cpp_function(method_adaptor<type>(fset)), extra...);
+    }
+    template <typename Getter, typename... Extra>
+    class_ &def_property(const char *name, const Getter &fget, const cpp_function &fset, const Extra& ...extra) {
+        return def_property(name, cpp_function(method_adaptor<type>(fget)), fset,
+                            return_value_policy::reference_internal, extra...);
+    }
+
+    /// Uses cpp_function's return_value_policy by default
+    template <typename... Extra>
+    class_ &def_property(const char *name, const cpp_function &fget, const cpp_function &fset, const Extra& ...extra) {
+        return def_property_static(name, fget, fset, is_method(*this), extra...);
+    }
+
+    /// Uses return_value_policy::reference by default
+    template <typename Getter, typename... Extra>
+    class_ &def_property_static(const char *name, const Getter &fget, const cpp_function &fset, const Extra& ...extra) {
+        return def_property_static(name, cpp_function(fget), fset, return_value_policy::reference, extra...);
+    }
+
+    /// Uses cpp_function's return_value_policy by default
+    template <typename... Extra>
+    class_ &def_property_static(const char *name, const cpp_function &fget, const cpp_function &fset, const Extra& ...extra) {
+        static_assert( 0 == detail::constexpr_sum(std::is_base_of<arg, Extra>::value...),
+                      "Argument annotations are not allowed for properties");
+        auto rec_fget = get_function_record(fget), rec_fset = get_function_record(fset);
+        auto *rec_active = rec_fget;
+        if (rec_fget) {
+           char *doc_prev = rec_fget->doc; /* 'extra' field may include a property-specific documentation string */
+           detail::process_attributes<Extra...>::init(extra..., rec_fget);
+           if (rec_fget->doc && rec_fget->doc != doc_prev) {
+              free(doc_prev);
+              rec_fget->doc = strdup(rec_fget->doc);
+           }
+        }
+        if (rec_fset) {
+            char *doc_prev = rec_fset->doc;
+            detail::process_attributes<Extra...>::init(extra..., rec_fset);
+            if (rec_fset->doc && rec_fset->doc != doc_prev) {
+                free(doc_prev);
+                rec_fset->doc = strdup(rec_fset->doc);
+            }
+            if (! rec_active) rec_active = rec_fset;
+        }
+        def_property_static_impl(name, fget, fset, rec_active);
+        return *this;
+    }
+
+private:
+    /// Initialize holder object, variant 1: object derives from enable_shared_from_this
+    template <typename T>
+    static void init_holder(detail::instance *inst, detail::value_and_holder &v_h,
+            const holder_type * /* unused */, const std::enable_shared_from_this<T> * /* dummy */) {
+        try {
+            auto sh = std::dynamic_pointer_cast<typename holder_type::element_type>(
+                    v_h.value_ptr<type>()->shared_from_this());
+            if (sh) {
+                new (std::addressof(v_h.holder<holder_type>())) holder_type(std::move(sh));
+                v_h.set_holder_constructed();
+            }
+        } catch (const std::bad_weak_ptr &) {}
+
+        if (!v_h.holder_constructed() && inst->owned) {
+            new (std::addressof(v_h.holder<holder_type>())) holder_type(v_h.value_ptr<type>());
+            v_h.set_holder_constructed();
+        }
+    }
+
+    static void init_holder_from_existing(const detail::value_and_holder &v_h,
+            const holder_type *holder_ptr, std::true_type /*is_copy_constructible*/) {
+        new (std::addressof(v_h.holder<holder_type>())) holder_type(*reinterpret_cast<const holder_type *>(holder_ptr));
+    }
+
+    static void init_holder_from_existing(const detail::value_and_holder &v_h,
+            const holder_type *holder_ptr, std::false_type /*is_copy_constructible*/) {
+        new (std::addressof(v_h.holder<holder_type>())) holder_type(std::move(*const_cast<holder_type *>(holder_ptr)));
+    }
+
+    /// Initialize holder object, variant 2: try to construct from existing holder object, if possible
+    static void init_holder(detail::instance *inst, detail::value_and_holder &v_h,
+            const holder_type *holder_ptr, const void * /* dummy -- not enable_shared_from_this<T>) */) {
+        if (holder_ptr) {
+            init_holder_from_existing(v_h, holder_ptr, std::is_copy_constructible<holder_type>());
+            v_h.set_holder_constructed();
+        } else if (inst->owned || detail::always_construct_holder<holder_type>::value) {
+            new (std::addressof(v_h.holder<holder_type>())) holder_type(v_h.value_ptr<type>());
+            v_h.set_holder_constructed();
+        }
+    }
+
+    /// Performs instance initialization including constructing a holder and registering the known
+    /// instance.  Should be called as soon as the `type` value_ptr is set for an instance.  Takes an
+    /// optional pointer to an existing holder to use; if not specified and the instance is
+    /// `.owned`, a new holder will be constructed to manage the value pointer.
+    static void init_instance(detail::instance *inst, const void *holder_ptr) {
+        auto v_h = inst->get_value_and_holder(detail::get_type_info(typeid(type)));
+        if (!v_h.instance_registered()) {
+            register_instance(inst, v_h.value_ptr(), v_h.type);
+            v_h.set_instance_registered();
+        }
+        init_holder(inst, v_h, (const holder_type *) holder_ptr, v_h.value_ptr<type>());
+    }
+
+    /// Deallocates an instance; via holder, if constructed; otherwise via operator delete.
+    static void dealloc(detail::value_and_holder &v_h) {
+        if (v_h.holder_constructed()) {
+            v_h.holder<holder_type>().~holder_type();
+            v_h.set_holder_constructed(false);
+        }
+        else {
+            detail::call_operator_delete(v_h.value_ptr<type>(),
+                v_h.type->type_size,
+                v_h.type->type_align
+            );
+        }
+        v_h.value_ptr() = nullptr;
+    }
+
+    static detail::function_record *get_function_record(handle h) {
+        h = detail::get_function(h);
+        return h ? (detail::function_record *) reinterpret_borrow<capsule>(PyCFunction_GET_SELF(h.ptr()))
+                 : nullptr;
+    }
+};
+
+/// Binds an existing constructor taking arguments Args...
+template <typename... Args> detail::initimpl::constructor<Args...> init() { return {}; }
+/// Like `init<Args...>()`, but the instance is always constructed through the alias class (even
+/// when not inheriting on the Python side).
+template <typename... Args> detail::initimpl::alias_constructor<Args...> init_alias() { return {}; }
+
+/// Binds a factory function as a constructor
+template <typename Func, typename Ret = detail::initimpl::factory<Func>>
+Ret init(Func &&f) { return {std::forward<Func>(f)}; }
+
+/// Dual-argument factory function: the first function is called when no alias is needed, the second
+/// when an alias is needed (i.e. due to python-side inheritance).  Arguments must be identical.
+template <typename CFunc, typename AFunc, typename Ret = detail::initimpl::factory<CFunc, AFunc>>
+Ret init(CFunc &&c, AFunc &&a) {
+    return {std::forward<CFunc>(c), std::forward<AFunc>(a)};
+}
+
+/// Binds pickling functions `__getstate__` and `__setstate__` and ensures that the type
+/// returned by `__getstate__` is the same as the argument accepted by `__setstate__`.
+template <typename GetState, typename SetState>
+detail::initimpl::pickle_factory<GetState, SetState> pickle(GetState &&g, SetState &&s) {
+    return {std::forward<GetState>(g), std::forward<SetState>(s)};
+}
+
+NAMESPACE_BEGIN(detail)
+struct enum_base {
+    enum_base(handle base, handle parent) : m_base(base), m_parent(parent) { }
+
+    PYBIND11_NOINLINE void init(bool is_arithmetic, bool is_convertible) {
+        m_base.attr("__entries") = dict();
+        auto property = handle((PyObject *) &PyProperty_Type);
+        auto static_property = handle((PyObject *) get_internals().static_property_type);
+
+        m_base.attr("__repr__") = cpp_function(
+            [](handle arg) -> str {
+                handle type = arg.get_type();
+                object type_name = type.attr("__name__");
+                dict entries = type.attr("__entries");
+                for (const auto &kv : entries) {
+                    object other = kv.second[int_(0)];
+                    if (other.equal(arg))
+                        return pybind11::str("{}.{}").format(type_name, kv.first);
+                }
+                return pybind11::str("{}.???").format(type_name);
+            }, is_method(m_base)
+        );
+
+        m_base.attr("name") = property(cpp_function(
+            [](handle arg) -> str {
+                dict entries = arg.get_type().attr("__entries");
+                for (const auto &kv : entries) {
+                    if (handle(kv.second[int_(0)]).equal(arg))
+                        return pybind11::str(kv.first);
+                }
+                return "???";
+            }, is_method(m_base)
+        ));
+
+        m_base.attr("__doc__") = static_property(cpp_function(
+            [](handle arg) -> std::string {
+                std::string docstring;
+                dict entries = arg.attr("__entries");
+                if (((PyTypeObject *) arg.ptr())->tp_doc)
+                    docstring += std::string(((PyTypeObject *) arg.ptr())->tp_doc) + "\n\n";
+                docstring += "Members:";
+                for (const auto &kv : entries) {
+                    auto key = std::string(pybind11::str(kv.first));
+                    auto comment = kv.second[int_(1)];
+                    docstring += "\n\n  " + key;
+                    if (!comment.is_none())
+                        docstring += " : " + (std::string) pybind11::str(comment);
+                }
+                return docstring;
+            }
+        ), none(), none(), "");
+
+        m_base.attr("__members__") = static_property(cpp_function(
+            [](handle arg) -> dict {
+                dict entries = arg.attr("__entries"), m;
+                for (const auto &kv : entries)
+                    m[kv.first] = kv.second[int_(0)];
+                return m;
+            }), none(), none(), ""
+        );
+
+        #define PYBIND11_ENUM_OP_STRICT(op, expr, strict_behavior)                     \
+            m_base.attr(op) = cpp_function(                                            \
+                [](object a, object b) {                                               \
+                    if (!a.get_type().is(b.get_type()))                                \
+                        strict_behavior;                                               \
+                    return expr;                                                       \
+                },                                                                     \
+                is_method(m_base))
+
+        #define PYBIND11_ENUM_OP_CONV(op, expr)                                        \
+            m_base.attr(op) = cpp_function(                                            \
+                [](object a_, object b_) {                                             \
+                    int_ a(a_), b(b_);                                                 \
+                    return expr;                                                       \
+                },                                                                     \
+                is_method(m_base))
+
+        #define PYBIND11_ENUM_OP_CONV_LHS(op, expr)                                    \
+            m_base.attr(op) = cpp_function(                                            \
+                [](object a_, object b) {                                              \
+                    int_ a(a_);                                                        \
+                    return expr;                                                       \
+                },                                                                     \
+                is_method(m_base))
+
+        if (is_convertible) {
+            PYBIND11_ENUM_OP_CONV_LHS("__eq__", !b.is_none() &&  a.equal(b));
+            PYBIND11_ENUM_OP_CONV_LHS("__ne__",  b.is_none() || !a.equal(b));
+
+            if (is_arithmetic) {
+                PYBIND11_ENUM_OP_CONV("__lt__",   a <  b);
+                PYBIND11_ENUM_OP_CONV("__gt__",   a >  b);
+                PYBIND11_ENUM_OP_CONV("__le__",   a <= b);
+                PYBIND11_ENUM_OP_CONV("__ge__",   a >= b);
+                PYBIND11_ENUM_OP_CONV("__and__",  a &  b);
+                PYBIND11_ENUM_OP_CONV("__rand__", a &  b);
+                PYBIND11_ENUM_OP_CONV("__or__",   a |  b);
+                PYBIND11_ENUM_OP_CONV("__ror__",  a |  b);
+                PYBIND11_ENUM_OP_CONV("__xor__",  a ^  b);
+                PYBIND11_ENUM_OP_CONV("__rxor__", a ^  b);
+                m_base.attr("__invert__") = cpp_function(
+                    [](object arg) { return ~(int_(arg)); }, is_method(m_base));
+            }
+        } else {
+            PYBIND11_ENUM_OP_STRICT("__eq__",  int_(a).equal(int_(b)), return false);
+            PYBIND11_ENUM_OP_STRICT("__ne__", !int_(a).equal(int_(b)), return true);
+
+            if (is_arithmetic) {
+                #define PYBIND11_THROW throw type_error("Expected an enumeration of matching type!");
+                PYBIND11_ENUM_OP_STRICT("__lt__", int_(a) <  int_(b), PYBIND11_THROW);
+                PYBIND11_ENUM_OP_STRICT("__gt__", int_(a) >  int_(b), PYBIND11_THROW);
+                PYBIND11_ENUM_OP_STRICT("__le__", int_(a) <= int_(b), PYBIND11_THROW);
+                PYBIND11_ENUM_OP_STRICT("__ge__", int_(a) >= int_(b), PYBIND11_THROW);
+                #undef PYBIND11_THROW
+            }
+        }
+
+        #undef PYBIND11_ENUM_OP_CONV_LHS
+        #undef PYBIND11_ENUM_OP_CONV
+        #undef PYBIND11_ENUM_OP_STRICT
+
+        object getstate = cpp_function(
+            [](object arg) { return int_(arg); }, is_method(m_base));
+
+        m_base.attr("__getstate__") = getstate;
+        m_base.attr("__hash__") = getstate;
+    }
+
+    PYBIND11_NOINLINE void value(char const* name_, object value, const char *doc = nullptr) {
+        dict entries = m_base.attr("__entries");
+        str name(name_);
+        if (entries.contains(name)) {
+            std::string type_name = (std::string) str(m_base.attr("__name__"));
+            throw value_error(type_name + ": element \"" + std::string(name_) + "\" already exists!");
+        }
+
+        entries[name] = std::make_pair(value, doc);
+        m_base.attr(name) = value;
+    }
+
+    PYBIND11_NOINLINE void export_values() {
+        dict entries = m_base.attr("__entries");
+        for (const auto &kv : entries)
+            m_parent.attr(kv.first) = kv.second[int_(0)];
+    }
+
+    handle m_base;
+    handle m_parent;
+};
+
+NAMESPACE_END(detail)
+
+/// Binds C++ enumerations and enumeration classes to Python
+template <typename Type> class enum_ : public class_<Type> {
+public:
+    using Base = class_<Type>;
+    using Base::def;
+    using Base::attr;
+    using Base::def_property_readonly;
+    using Base::def_property_readonly_static;
+    using Scalar = typename std::underlying_type<Type>::type;
+
+    template <typename... Extra>
+    enum_(const handle &scope, const char *name, const Extra&... extra)
+      : class_<Type>(scope, name, extra...), m_base(*this, scope) {
+        constexpr bool is_arithmetic = detail::any_of<std::is_same<arithmetic, Extra>...>::value;
+        constexpr bool is_convertible = std::is_convertible<Type, Scalar>::value;
+        m_base.init(is_arithmetic, is_convertible);
+
+        def(init([](Scalar i) { return static_cast<Type>(i); }));
+        def("__int__", [](Type value) { return (Scalar) value; });
+        #if PY_MAJOR_VERSION < 3
+            def("__long__", [](Type value) { return (Scalar) value; });
+        #endif
+        #if PY_MAJOR_VERSION > 3 || (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 8)
+            def("__index__", [](Type value) { return (Scalar) value; });
+        #endif
+
+        cpp_function setstate(
+            [](Type &value, Scalar arg) { value = static_cast<Type>(arg); },
+            is_method(*this));
+        attr("__setstate__") = setstate;
+    }
+
+    /// Export enumeration entries into the parent scope
+    enum_& export_values() {
+        m_base.export_values();
+        return *this;
+    }
+
+    /// Add an enumeration entry
+    enum_& value(char const* name, Type value, const char *doc = nullptr) {
+        m_base.value(name, pybind11::cast(value, return_value_policy::copy), doc);
+        return *this;
+    }
+
+private:
+    detail::enum_base m_base;
+};
+
+NAMESPACE_BEGIN(detail)
+
+
+inline void keep_alive_impl(handle nurse, handle patient) {
+    if (!nurse || !patient)
+        pybind11_fail("Could not activate keep_alive!");
+
+    if (patient.is_none() || nurse.is_none())
+        return; /* Nothing to keep alive or nothing to be kept alive by */
+
+    auto tinfo = all_type_info(Py_TYPE(nurse.ptr()));
+    if (!tinfo.empty()) {
+        /* It's a pybind-registered type, so we can store the patient in the
+         * internal list. */
+        add_patient(nurse.ptr(), patient.ptr());
+    }
+    else {
+        /* Fall back to clever approach based on weak references taken from
+         * Boost.Python. This is not used for pybind-registered types because
+         * the objects can be destroyed out-of-order in a GC pass. */
+        cpp_function disable_lifesupport(
+            [patient](handle weakref) { patient.dec_ref(); weakref.dec_ref(); });
+
+        weakref wr(nurse, disable_lifesupport);
+
+        patient.inc_ref(); /* reference patient and leak the weak reference */
+        (void) wr.release();
+    }
+}
+
+PYBIND11_NOINLINE inline void keep_alive_impl(size_t Nurse, size_t Patient, function_call &call, handle ret) {
+    auto get_arg = [&](size_t n) {
+        if (n == 0)
+            return ret;
+        else if (n == 1 && call.init_self)
+            return call.init_self;
+        else if (n <= call.args.size())
+            return call.args[n - 1];
+        return handle();
+    };
+
+    keep_alive_impl(get_arg(Nurse), get_arg(Patient));
+}
+
+inline std::pair<decltype(internals::registered_types_py)::iterator, bool> all_type_info_get_cache(PyTypeObject *type) {
+    auto res = get_internals().registered_types_py
+#ifdef __cpp_lib_unordered_map_try_emplace
+        .try_emplace(type);
+#else
+        .emplace(type, std::vector<detail::type_info *>());
+#endif
+    if (res.second) {
+        // New cache entry created; set up a weak reference to automatically remove it if the type
+        // gets destroyed:
+        weakref((PyObject *) type, cpp_function([type](handle wr) {
+            get_internals().registered_types_py.erase(type);
+            wr.dec_ref();
+        })).release();
+    }
+
+    return res;
+}
+
+template <typename Iterator, typename Sentinel, bool KeyIterator, return_value_policy Policy>
+struct iterator_state {
+    Iterator it;
+    Sentinel end;
+    bool first_or_done;
+};
+
+NAMESPACE_END(detail)
+
+/// Makes a python iterator from a first and past-the-end C++ InputIterator.
+template <return_value_policy Policy = return_value_policy::reference_internal,
+          typename Iterator,
+          typename Sentinel,
+          typename ValueType = decltype(*std::declval<Iterator>()),
+          typename... Extra>
+iterator make_iterator(Iterator first, Sentinel last, Extra &&... extra) {
+    typedef detail::iterator_state<Iterator, Sentinel, false, Policy> state;
+
+    if (!detail::get_type_info(typeid(state), false)) {
+        class_<state>(handle(), "iterator", pybind11::module_local())
+            .def("__iter__", [](state &s) -> state& { return s; })
+            .def("__next__", [](state &s) -> ValueType {
+                if (!s.first_or_done)
+                    ++s.it;
+                else
+                    s.first_or_done = false;
+                if (s.it == s.end) {
+                    s.first_or_done = true;
+                    throw stop_iteration();
+                }
+                return *s.it;
+            }, std::forward<Extra>(extra)..., Policy);
+    }
+
+    return cast(state{first, last, true});
+}
+
+/// Makes an python iterator over the keys (`.first`) of a iterator over pairs from a
+/// first and past-the-end InputIterator.
+template <return_value_policy Policy = return_value_policy::reference_internal,
+          typename Iterator,
+          typename Sentinel,
+          typename KeyType = decltype((*std::declval<Iterator>()).first),
+          typename... Extra>
+iterator make_key_iterator(Iterator first, Sentinel last, Extra &&... extra) {
+    typedef detail::iterator_state<Iterator, Sentinel, true, Policy> state;
+
+    if (!detail::get_type_info(typeid(state), false)) {
+        class_<state>(handle(), "iterator", pybind11::module_local())
+            .def("__iter__", [](state &s) -> state& { return s; })
+            .def("__next__", [](state &s) -> KeyType {
+                if (!s.first_or_done)
+                    ++s.it;
+                else
+                    s.first_or_done = false;
+                if (s.it == s.end) {
+                    s.first_or_done = true;
+                    throw stop_iteration();
+                }
+                return (*s.it).first;
+            }, std::forward<Extra>(extra)..., Policy);
+    }
+
+    return cast(state{first, last, true});
+}
+
+/// Makes an iterator over values of an stl container or other container supporting
+/// `std::begin()`/`std::end()`
+template <return_value_policy Policy = return_value_policy::reference_internal,
+          typename Type, typename... Extra> iterator make_iterator(Type &value, Extra&&... extra) {
+    return make_iterator<Policy>(std::begin(value), std::end(value), extra...);
+}
+
+/// Makes an iterator over the keys (`.first`) of a stl map-like container supporting
+/// `std::begin()`/`std::end()`
+template <return_value_policy Policy = return_value_policy::reference_internal,
+          typename Type, typename... Extra> iterator make_key_iterator(Type &value, Extra&&... extra) {
+    return make_key_iterator<Policy>(std::begin(value), std::end(value), extra...);
+}
+
+template <typename InputType, typename OutputType> void implicitly_convertible() {
+    struct set_flag {
+        bool &flag;
+        set_flag(bool &flag) : flag(flag) { flag = true; }
+        ~set_flag() { flag = false; }
+    };
+    auto implicit_caster = [](PyObject *obj, PyTypeObject *type) -> PyObject * {
+        static bool currently_used = false;
+        if (currently_used) // implicit conversions are non-reentrant
+            return nullptr;
+        set_flag flag_helper(currently_used);
+        if (!detail::make_caster<InputType>().load(obj, false))
+            return nullptr;
+        tuple args(1);
+        args[0] = obj;
+        PyObject *result = PyObject_Call((PyObject *) type, args.ptr(), nullptr);
+        if (result == nullptr)
+            PyErr_Clear();
+        return result;
+    };
+
+    if (auto tinfo = detail::get_type_info(typeid(OutputType)))
+        tinfo->implicit_conversions.push_back(implicit_caster);
+    else
+        pybind11_fail("implicitly_convertible: Unable to find type " + type_id<OutputType>());
+}
+
+template <typename ExceptionTranslator>
+void register_exception_translator(ExceptionTranslator&& translator) {
+    detail::get_internals().registered_exception_translators.push_front(
+        std::forward<ExceptionTranslator>(translator));
+}
+
+/**
+ * Wrapper to generate a new Python exception type.
+ *
+ * This should only be used with PyErr_SetString for now.
+ * It is not (yet) possible to use as a py::base.
+ * Template type argument is reserved for future use.
+ */
+template <typename type>
+class exception : public object {
+public:
+    exception() = default;
+    exception(handle scope, const char *name, PyObject *base = PyExc_Exception) {
+        std::string full_name = scope.attr("__name__").cast<std::string>() +
+                                std::string(".") + name;
+        m_ptr = PyErr_NewException(const_cast<char *>(full_name.c_str()), base, NULL);
+        if (hasattr(scope, name))
+            pybind11_fail("Error during initialization: multiple incompatible "
+                          "definitions with name \"" + std::string(name) + "\"");
+        scope.attr(name) = *this;
+    }
+
+    // Sets the current python exception to this exception object with the given message
+    void operator()(const char *message) {
+        PyErr_SetString(m_ptr, message);
+    }
+};
+
+NAMESPACE_BEGIN(detail)
+// Returns a reference to a function-local static exception object used in the simple
+// register_exception approach below.  (It would be simpler to have the static local variable
+// directly in register_exception, but that makes clang <3.5 segfault - issue #1349).
+template <typename CppException>
+exception<CppException> &get_exception_object() { static exception<CppException> ex; return ex; }
+NAMESPACE_END(detail)
+
+/**
+ * Registers a Python exception in `m` of the given `name` and installs an exception translator to
+ * translate the C++ exception to the created Python exception using the exceptions what() method.
+ * This is intended for simple exception translations; for more complex translation, register the
+ * exception object and translator directly.
+ */
+template <typename CppException>
+exception<CppException> &register_exception(handle scope,
+                                            const char *name,
+                                            PyObject *base = PyExc_Exception) {
+    auto &ex = detail::get_exception_object<CppException>();
+    if (!ex) ex = exception<CppException>(scope, name, base);
+
+    register_exception_translator([](std::exception_ptr p) {
+        if (!p) return;
+        try {
+            std::rethrow_exception(p);
+        } catch (const CppException &e) {
+            detail::get_exception_object<CppException>()(e.what());
+        }
+    });
+    return ex;
+}
+
+NAMESPACE_BEGIN(detail)
+PYBIND11_NOINLINE inline void print(tuple args, dict kwargs) {
+    auto strings = tuple(args.size());
+    for (size_t i = 0; i < args.size(); ++i) {
+        strings[i] = str(args[i]);
+    }
+    auto sep = kwargs.contains("sep") ? kwargs["sep"] : cast(" ");
+    auto line = sep.attr("join")(strings);
+
+    object file;
+    if (kwargs.contains("file")) {
+        file = kwargs["file"].cast<object>();
+    } else {
+        try {
+            file = module::import("sys").attr("stdout");
+        } catch (const error_already_set &) {
+            /* If print() is called from code that is executed as
+               part of garbage collection during interpreter shutdown,
+               importing 'sys' can fail. Give up rather than crashing the
+               interpreter in this case. */
+            return;
+        }
+    }
+
+    auto write = file.attr("write");
+    write(line);
+    write(kwargs.contains("end") ? kwargs["end"] : cast("\n"));
+
+    if (kwargs.contains("flush") && kwargs["flush"].cast<bool>())
+        file.attr("flush")();
+}
+NAMESPACE_END(detail)
+
+template <return_value_policy policy = return_value_policy::automatic_reference, typename... Args>
+void print(Args &&...args) {
+    auto c = detail::collect_arguments<policy>(std::forward<Args>(args)...);
+    detail::print(c.args(), c.kwargs());
+}
+
+#if defined(WITH_THREAD) && !defined(PYPY_VERSION)
+
+/* The functions below essentially reproduce the PyGILState_* API using a RAII
+ * pattern, but there are a few important differences:
+ *
+ * 1. When acquiring the GIL from an non-main thread during the finalization
+ *    phase, the GILState API blindly terminates the calling thread, which
+ *    is often not what is wanted. This API does not do this.
+ *
+ * 2. The gil_scoped_release function can optionally cut the relationship
+ *    of a PyThreadState and its associated thread, which allows moving it to
+ *    another thread (this is a fairly rare/advanced use case).
+ *
+ * 3. The reference count of an acquired thread state can be controlled. This
+ *    can be handy to prevent cases where callbacks issued from an external
+ *    thread would otherwise constantly construct and destroy thread state data
+ *    structures.
+ *
+ * See the Python bindings of NanoGUI (http://github.com/wjakob/nanogui) for an
+ * example which uses features 2 and 3 to migrate the Python thread of
+ * execution to another thread (to run the event loop on the original thread,
+ * in this case).
+ */
+
+class gil_scoped_acquire {
+public:
+    PYBIND11_NOINLINE gil_scoped_acquire() {
+        auto const &internals = detail::get_internals();
+        tstate = (PyThreadState *) PYBIND11_TLS_GET_VALUE(internals.tstate);
+
+        if (!tstate) {
+            /* Check if the GIL was acquired using the PyGILState_* API instead (e.g. if
+               calling from a Python thread). Since we use a different key, this ensures
+               we don't create a new thread state and deadlock in PyEval_AcquireThread
+               below. Note we don't save this state with internals.tstate, since we don't
+               create it we would fail to clear it (its reference count should be > 0). */
+            tstate = PyGILState_GetThisThreadState();
+        }
+
+        if (!tstate) {
+            tstate = PyThreadState_New(internals.istate);
+            #if !defined(NDEBUG)
+                if (!tstate)
+                    pybind11_fail("scoped_acquire: could not create thread state!");
+            #endif
+            tstate->gilstate_counter = 0;
+            PYBIND11_TLS_REPLACE_VALUE(internals.tstate, tstate);
+        } else {
+            release = detail::get_thread_state_unchecked() != tstate;
+        }
+
+        if (release) {
+            /* Work around an annoying assertion in PyThreadState_Swap */
+            #if defined(Py_DEBUG)
+                PyInterpreterState *interp = tstate->interp;
+                tstate->interp = nullptr;
+            #endif
+            PyEval_AcquireThread(tstate);
+            #if defined(Py_DEBUG)
+                tstate->interp = interp;
+            #endif
+        }
+
+        inc_ref();
+    }
+
+    void inc_ref() {
+        ++tstate->gilstate_counter;
+    }
+
+    PYBIND11_NOINLINE void dec_ref() {
+        --tstate->gilstate_counter;
+        #if !defined(NDEBUG)
+            if (detail::get_thread_state_unchecked() != tstate)
+                pybind11_fail("scoped_acquire::dec_ref(): thread state must be current!");
+            if (tstate->gilstate_counter < 0)
+                pybind11_fail("scoped_acquire::dec_ref(): reference count underflow!");
+        #endif
+        if (tstate->gilstate_counter == 0) {
+            #if !defined(NDEBUG)
+                if (!release)
+                    pybind11_fail("scoped_acquire::dec_ref(): internal error!");
+            #endif
+            PyThreadState_Clear(tstate);
+            PyThreadState_DeleteCurrent();
+            PYBIND11_TLS_DELETE_VALUE(detail::get_internals().tstate);
+            release = false;
+        }
+    }
+
+    PYBIND11_NOINLINE ~gil_scoped_acquire() {
+        dec_ref();
+        if (release)
+           PyEval_SaveThread();
+    }
+private:
+    PyThreadState *tstate = nullptr;
+    bool release = true;
+};
+
+class gil_scoped_release {
+public:
+    explicit gil_scoped_release(bool disassoc = false) : disassoc(disassoc) {
+        // `get_internals()` must be called here unconditionally in order to initialize
+        // `internals.tstate` for subsequent `gil_scoped_acquire` calls. Otherwise, an
+        // initialization race could occur as multiple threads try `gil_scoped_acquire`.
+        const auto &internals = detail::get_internals();
+        tstate = PyEval_SaveThread();
+        if (disassoc) {
+            auto key = internals.tstate;
+            PYBIND11_TLS_DELETE_VALUE(key);
+        }
+    }
+    ~gil_scoped_release() {
+        if (!tstate)
+            return;
+        PyEval_RestoreThread(tstate);
+        if (disassoc) {
+            auto key = detail::get_internals().tstate;
+            PYBIND11_TLS_REPLACE_VALUE(key, tstate);
+        }
+    }
+private:
+    PyThreadState *tstate;
+    bool disassoc;
+};
+#elif defined(PYPY_VERSION)
+class gil_scoped_acquire {
+    PyGILState_STATE state;
+public:
+    gil_scoped_acquire() { state = PyGILState_Ensure(); }
+    ~gil_scoped_acquire() { PyGILState_Release(state); }
+};
+
+class gil_scoped_release {
+    PyThreadState *state;
+public:
+    gil_scoped_release() { state = PyEval_SaveThread(); }
+    ~gil_scoped_release() { PyEval_RestoreThread(state); }
+};
+#else
+class gil_scoped_acquire { };
+class gil_scoped_release { };
+#endif
+
+error_already_set::~error_already_set() {
+    if (m_type) {
+        gil_scoped_acquire gil;
+        error_scope scope;
+        m_type.release().dec_ref();
+        m_value.release().dec_ref();
+        m_trace.release().dec_ref();
+    }
+}
+
+inline function get_type_overload(const void *this_ptr, const detail::type_info *this_type, const char *name)  {
+    handle self = detail::get_object_handle(this_ptr, this_type);
+    if (!self)
+        return function();
+    handle type = self.get_type();
+    auto key = std::make_pair(type.ptr(), name);
+
+    /* Cache functions that aren't overloaded in Python to avoid
+       many costly Python dictionary lookups below */
+    auto &cache = detail::get_internals().inactive_overload_cache;
+    if (cache.find(key) != cache.end())
+        return function();
+
+    function overload = getattr(self, name, function());
+    if (overload.is_cpp_function()) {
+        cache.insert(key);
+        return function();
+    }
+
+    /* Don't call dispatch code if invoked from overridden function.
+       Unfortunately this doesn't work on PyPy. */
+#if !defined(PYPY_VERSION)
+    PyFrameObject *frame = PyThreadState_Get()->frame;
+    if (frame && (std::string) str(frame->f_code->co_name) == name &&
+        frame->f_code->co_argcount > 0) {
+        PyFrame_FastToLocals(frame);
+        PyObject *self_caller = PyDict_GetItem(
+            frame->f_locals, PyTuple_GET_ITEM(frame->f_code->co_varnames, 0));
+        if (self_caller == self.ptr())
+            return function();
+    }
+#else
+    /* PyPy currently doesn't provide a detailed cpyext emulation of
+       frame objects, so we have to emulate this using Python. This
+       is going to be slow..*/
+    dict d; d["self"] = self; d["name"] = pybind11::str(name);
+    PyObject *result = PyRun_String(
+        "import inspect\n"
+        "frame = inspect.currentframe()\n"
+        "if frame is not None:\n"
+        "    frame = frame.f_back\n"
+        "    if frame is not None and str(frame.f_code.co_name) == name and "
+        "frame.f_code.co_argcount > 0:\n"
+        "        self_caller = frame.f_locals[frame.f_code.co_varnames[0]]\n"
+        "        if self_caller == self:\n"
+        "            self = None\n",
+        Py_file_input, d.ptr(), d.ptr());
+    if (result == nullptr)
+        throw error_already_set();
+    if (d["self"].is_none())
+        return function();
+    Py_DECREF(result);
+#endif
+
+    return overload;
+}
+
+/** \rst
+  Try to retrieve a python method by the provided name from the instance pointed to by the this_ptr.
+
+  :this_ptr: The pointer to the object the overload should be retrieved for. This should be the first
+                   non-trampoline class encountered in the inheritance chain.
+  :name: The name of the overloaded Python method to retrieve.
+  :return: The Python method by this name from the object or an empty function wrapper.
+ \endrst */
+template <class T> function get_overload(const T *this_ptr, const char *name) {
+    auto tinfo = detail::get_type_info(typeid(T));
+    return tinfo ? get_type_overload(this_ptr, tinfo, name) : function();
+}
+
+#define PYBIND11_OVERLOAD_INT(ret_type, cname, name, ...) { \
+        pybind11::gil_scoped_acquire gil; \
+        pybind11::function overload = pybind11::get_overload(static_cast<const cname *>(this), name); \
+        if (overload) { \
+            auto o = overload(__VA_ARGS__); \
+            if (pybind11::detail::cast_is_temporary_value_reference<ret_type>::value) { \
+                static pybind11::detail::overload_caster_t<ret_type> caster; \
+                return pybind11::detail::cast_ref<ret_type>(std::move(o), caster); \
+            } \
+            else return pybind11::detail::cast_safe<ret_type>(std::move(o)); \
+        } \
+    }
+
+/** \rst
+    Macro to populate the virtual method in the trampoline class. This macro tries to look up a method named 'fn'
+    from the Python side, deals with the :ref:`gil` and necessary argument conversions to call this method and return
+    the appropriate type. See :ref:`overriding_virtuals` for more information. This macro should be used when the method
+    name in C is not the same as the method name in Python. For example with `__str__`.
+
+    .. code-block:: cpp
+
+      std::string toString() override {
+        PYBIND11_OVERLOAD_NAME(
+            std::string, // Return type (ret_type)
+            Animal,      // Parent class (cname)
+            toString,    // Name of function in C++ (name)
+            "__str__",   // Name of method in Python (fn)
+        );
+      }
+\endrst */
+#define PYBIND11_OVERLOAD_NAME(ret_type, cname, name, fn, ...) \
+    PYBIND11_OVERLOAD_INT(PYBIND11_TYPE(ret_type), PYBIND11_TYPE(cname), name, __VA_ARGS__) \
+    return cname::fn(__VA_ARGS__)
+
+/** \rst
+    Macro for pure virtual functions, this function is identical to :c:macro:`PYBIND11_OVERLOAD_NAME`, except that it
+    throws if no overload can be found.
+\endrst */
+#define PYBIND11_OVERLOAD_PURE_NAME(ret_type, cname, name, fn, ...) \
+    PYBIND11_OVERLOAD_INT(PYBIND11_TYPE(ret_type), PYBIND11_TYPE(cname), name, __VA_ARGS__) \
+    pybind11::pybind11_fail("Tried to call pure virtual function \"" PYBIND11_STRINGIFY(cname) "::" name "\"");
+
+/** \rst
+    Macro to populate the virtual method in the trampoline class. This macro tries to look up the method
+    from the Python side, deals with the :ref:`gil` and necessary argument conversions to call this method and return
+    the appropriate type. This macro should be used if the method name in C and in Python are identical.
+    See :ref:`overriding_virtuals` for more information.
+
+    .. code-block:: cpp
+
+      class PyAnimal : public Animal {
+      public:
+          // Inherit the constructors
+          using Animal::Animal;
+
+          // Trampoline (need one for each virtual function)
+          std::string go(int n_times) override {
+              PYBIND11_OVERLOAD_PURE(
+                  std::string, // Return type (ret_type)
+                  Animal,      // Parent class (cname)
+                  go,          // Name of function in C++ (must match Python name) (fn)
+                  n_times      // Argument(s) (...)
+              );
+          }
+      };
+\endrst */
+#define PYBIND11_OVERLOAD(ret_type, cname, fn, ...) \
+    PYBIND11_OVERLOAD_NAME(PYBIND11_TYPE(ret_type), PYBIND11_TYPE(cname), #fn, fn, __VA_ARGS__)
+
+/** \rst
+    Macro for pure virtual functions, this function is identical to :c:macro:`PYBIND11_OVERLOAD`, except that it throws
+    if no overload can be found.
+\endrst */
+#define PYBIND11_OVERLOAD_PURE(ret_type, cname, fn, ...) \
+    PYBIND11_OVERLOAD_PURE_NAME(PYBIND11_TYPE(ret_type), PYBIND11_TYPE(cname), #fn, fn, __VA_ARGS__)
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
+
+#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
+#  pragma warning(pop)
+#elif defined(__GNUG__) && !defined(__clang__)
+#  pragma GCC diagnostic pop
+#endif
diff --git a/3rdparty/pybind11/include/pybind11/pytypes.h b/3rdparty/pybind11/include/pybind11/pytypes.h
new file mode 100644
index 00000000..4003d691
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/pytypes.h
@@ -0,0 +1,1484 @@
+/*
+    pybind11/pytypes.h: Convenience wrapper classes for basic Python types
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "detail/common.h"
+#include "buffer_info.h"
+#include <utility>
+#include <type_traits>
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+
+/* A few forward declarations */
+class handle; class object;
+class str; class iterator;
+struct arg; struct arg_v;
+
+NAMESPACE_BEGIN(detail)
+class args_proxy;
+inline bool isinstance_generic(handle obj, const std::type_info &tp);
+
+// Accessor forward declarations
+template <typename Policy> class accessor;
+namespace accessor_policies {
+    struct obj_attr;
+    struct str_attr;
+    struct generic_item;
+    struct sequence_item;
+    struct list_item;
+    struct tuple_item;
+}
+using obj_attr_accessor = accessor<accessor_policies::obj_attr>;
+using str_attr_accessor = accessor<accessor_policies::str_attr>;
+using item_accessor = accessor<accessor_policies::generic_item>;
+using sequence_accessor = accessor<accessor_policies::sequence_item>;
+using list_accessor = accessor<accessor_policies::list_item>;
+using tuple_accessor = accessor<accessor_policies::tuple_item>;
+
+/// Tag and check to identify a class which implements the Python object API
+class pyobject_tag { };
+template <typename T> using is_pyobject = std::is_base_of<pyobject_tag, remove_reference_t<T>>;
+
+/** \rst
+    A mixin class which adds common functions to `handle`, `object` and various accessors.
+    The only requirement for `Derived` is to implement ``PyObject *Derived::ptr() const``.
+\endrst */
+template <typename Derived>
+class object_api : public pyobject_tag {
+    const Derived &derived() const { return static_cast<const Derived &>(*this); }
+
+public:
+    /** \rst
+        Return an iterator equivalent to calling ``iter()`` in Python. The object
+        must be a collection which supports the iteration protocol.
+    \endrst */
+    iterator begin() const;
+    /// Return a sentinel which ends iteration.
+    iterator end() const;
+
+    /** \rst
+        Return an internal functor to invoke the object's sequence protocol. Casting
+        the returned ``detail::item_accessor`` instance to a `handle` or `object`
+        subclass causes a corresponding call to ``__getitem__``. Assigning a `handle`
+        or `object` subclass causes a call to ``__setitem__``.
+    \endrst */
+    item_accessor operator[](handle key) const;
+    /// See above (the only difference is that they key is provided as a string literal)
+    item_accessor operator[](const char *key) const;
+
+    /** \rst
+        Return an internal functor to access the object's attributes. Casting the
+        returned ``detail::obj_attr_accessor`` instance to a `handle` or `object`
+        subclass causes a corresponding call to ``getattr``. Assigning a `handle`
+        or `object` subclass causes a call to ``setattr``.
+    \endrst */
+    obj_attr_accessor attr(handle key) const;
+    /// See above (the only difference is that they key is provided as a string literal)
+    str_attr_accessor attr(const char *key) const;
+
+    /** \rst
+        Matches * unpacking in Python, e.g. to unpack arguments out of a ``tuple``
+        or ``list`` for a function call. Applying another * to the result yields
+        ** unpacking, e.g. to unpack a dict as function keyword arguments.
+        See :ref:`calling_python_functions`.
+    \endrst */
+    args_proxy operator*() const;
+
+    /// Check if the given item is contained within this object, i.e. ``item in obj``.
+    template <typename T> bool contains(T &&item) const;
+
+    /** \rst
+        Assuming the Python object is a function or implements the ``__call__``
+        protocol, ``operator()`` invokes the underlying function, passing an
+        arbitrary set of parameters. The result is returned as a `object` and
+        may need to be converted back into a Python object using `handle::cast()`.
+
+        When some of the arguments cannot be converted to Python objects, the
+        function will throw a `cast_error` exception. When the Python function
+        call fails, a `error_already_set` exception is thrown.
+    \endrst */
+    template <return_value_policy policy = return_value_policy::automatic_reference, typename... Args>
+    object operator()(Args &&...args) const;
+    template <return_value_policy policy = return_value_policy::automatic_reference, typename... Args>
+    PYBIND11_DEPRECATED("call(...) was deprecated in favor of operator()(...)")
+        object call(Args&&... args) const;
+
+    /// Equivalent to ``obj is other`` in Python.
+    bool is(object_api const& other) const { return derived().ptr() == other.derived().ptr(); }
+    /// Equivalent to ``obj is None`` in Python.
+    bool is_none() const { return derived().ptr() == Py_None; }
+    /// Equivalent to obj == other in Python
+    bool equal(object_api const &other) const      { return rich_compare(other, Py_EQ); }
+    bool not_equal(object_api const &other) const  { return rich_compare(other, Py_NE); }
+    bool operator<(object_api const &other) const  { return rich_compare(other, Py_LT); }
+    bool operator<=(object_api const &other) const { return rich_compare(other, Py_LE); }
+    bool operator>(object_api const &other) const  { return rich_compare(other, Py_GT); }
+    bool operator>=(object_api const &other) const { return rich_compare(other, Py_GE); }
+
+    object operator-() const;
+    object operator~() const;
+    object operator+(object_api const &other) const;
+    object operator+=(object_api const &other) const;
+    object operator-(object_api const &other) const;
+    object operator-=(object_api const &other) const;
+    object operator*(object_api const &other) const;
+    object operator*=(object_api const &other) const;
+    object operator/(object_api const &other) const;
+    object operator/=(object_api const &other) const;
+    object operator|(object_api const &other) const;
+    object operator|=(object_api const &other) const;
+    object operator&(object_api const &other) const;
+    object operator&=(object_api const &other) const;
+    object operator^(object_api const &other) const;
+    object operator^=(object_api const &other) const;
+    object operator<<(object_api const &other) const;
+    object operator<<=(object_api const &other) const;
+    object operator>>(object_api const &other) const;
+    object operator>>=(object_api const &other) const;
+
+    PYBIND11_DEPRECATED("Use py::str(obj) instead")
+    pybind11::str str() const;
+
+    /// Get or set the object's docstring, i.e. ``obj.__doc__``.
+    str_attr_accessor doc() const;
+
+    /// Return the object's current reference count
+    int ref_count() const { return static_cast<int>(Py_REFCNT(derived().ptr())); }
+    /// Return a handle to the Python type object underlying the instance
+    handle get_type() const;
+
+private:
+    bool rich_compare(object_api const &other, int value) const;
+};
+
+NAMESPACE_END(detail)
+
+/** \rst
+    Holds a reference to a Python object (no reference counting)
+
+    The `handle` class is a thin wrapper around an arbitrary Python object (i.e. a
+    ``PyObject *`` in Python's C API). It does not perform any automatic reference
+    counting and merely provides a basic C++ interface to various Python API functions.
+
+    .. seealso::
+        The `object` class inherits from `handle` and adds automatic reference
+        counting features.
+\endrst */
+class handle : public detail::object_api<handle> {
+public:
+    /// The default constructor creates a handle with a ``nullptr``-valued pointer
+    handle() = default;
+    /// Creates a ``handle`` from the given raw Python object pointer
+    handle(PyObject *ptr) : m_ptr(ptr) { } // Allow implicit conversion from PyObject*
+
+    /// Return the underlying ``PyObject *`` pointer
+    PyObject *ptr() const { return m_ptr; }
+    PyObject *&ptr() { return m_ptr; }
+
+    /** \rst
+        Manually increase the reference count of the Python object. Usually, it is
+        preferable to use the `object` class which derives from `handle` and calls
+        this function automatically. Returns a reference to itself.
+    \endrst */
+    const handle& inc_ref() const & { Py_XINCREF(m_ptr); return *this; }
+
+    /** \rst
+        Manually decrease the reference count of the Python object. Usually, it is
+        preferable to use the `object` class which derives from `handle` and calls
+        this function automatically. Returns a reference to itself.
+    \endrst */
+    const handle& dec_ref() const & { Py_XDECREF(m_ptr); return *this; }
+
+    /** \rst
+        Attempt to cast the Python object into the given C++ type. A `cast_error`
+        will be throw upon failure.
+    \endrst */
+    template <typename T> T cast() const;
+    /// Return ``true`` when the `handle` wraps a valid Python object
+    explicit operator bool() const { return m_ptr != nullptr; }
+    /** \rst
+        Deprecated: Check that the underlying pointers are the same.
+        Equivalent to ``obj1 is obj2`` in Python.
+    \endrst */
+    PYBIND11_DEPRECATED("Use obj1.is(obj2) instead")
+    bool operator==(const handle &h) const { return m_ptr == h.m_ptr; }
+    PYBIND11_DEPRECATED("Use !obj1.is(obj2) instead")
+    bool operator!=(const handle &h) const { return m_ptr != h.m_ptr; }
+    PYBIND11_DEPRECATED("Use handle::operator bool() instead")
+    bool check() const { return m_ptr != nullptr; }
+protected:
+    PyObject *m_ptr = nullptr;
+};
+
+/** \rst
+    Holds a reference to a Python object (with reference counting)
+
+    Like `handle`, the `object` class is a thin wrapper around an arbitrary Python
+    object (i.e. a ``PyObject *`` in Python's C API). In contrast to `handle`, it
+    optionally increases the object's reference count upon construction, and it
+    *always* decreases the reference count when the `object` instance goes out of
+    scope and is destructed. When using `object` instances consistently, it is much
+    easier to get reference counting right at the first attempt.
+\endrst */
+class object : public handle {
+public:
+    object() = default;
+    PYBIND11_DEPRECATED("Use reinterpret_borrow<object>() or reinterpret_steal<object>()")
+    object(handle h, bool is_borrowed) : handle(h) { if (is_borrowed) inc_ref(); }
+    /// Copy constructor; always increases the reference count
+    object(const object &o) : handle(o) { inc_ref(); }
+    /// Move constructor; steals the object from ``other`` and preserves its reference count
+    object(object &&other) noexcept { m_ptr = other.m_ptr; other.m_ptr = nullptr; }
+    /// Destructor; automatically calls `handle::dec_ref()`
+    ~object() { dec_ref(); }
+
+    /** \rst
+        Resets the internal pointer to ``nullptr`` without without decreasing the
+        object's reference count. The function returns a raw handle to the original
+        Python object.
+    \endrst */
+    handle release() {
+      PyObject *tmp = m_ptr;
+      m_ptr = nullptr;
+      return handle(tmp);
+    }
+
+    object& operator=(const object &other) {
+        other.inc_ref();
+        dec_ref();
+        m_ptr = other.m_ptr;
+        return *this;
+    }
+
+    object& operator=(object &&other) noexcept {
+        if (this != &other) {
+            handle temp(m_ptr);
+            m_ptr = other.m_ptr;
+            other.m_ptr = nullptr;
+            temp.dec_ref();
+        }
+        return *this;
+    }
+
+    // Calling cast() on an object lvalue just copies (via handle::cast)
+    template <typename T> T cast() const &;
+    // Calling on an object rvalue does a move, if needed and/or possible
+    template <typename T> T cast() &&;
+
+protected:
+    // Tags for choosing constructors from raw PyObject *
+    struct borrowed_t { };
+    struct stolen_t { };
+
+    template <typename T> friend T reinterpret_borrow(handle);
+    template <typename T> friend T reinterpret_steal(handle);
+
+public:
+    // Only accessible from derived classes and the reinterpret_* functions
+    object(handle h, borrowed_t) : handle(h) { inc_ref(); }
+    object(handle h, stolen_t) : handle(h) { }
+};
+
+/** \rst
+    Declare that a `handle` or ``PyObject *`` is a certain type and borrow the reference.
+    The target type ``T`` must be `object` or one of its derived classes. The function
+    doesn't do any conversions or checks. It's up to the user to make sure that the
+    target type is correct.
+
+    .. code-block:: cpp
+
+        PyObject *p = PyList_GetItem(obj, index);
+        py::object o = reinterpret_borrow<py::object>(p);
+        // or
+        py::tuple t = reinterpret_borrow<py::tuple>(p); // <-- `p` must be already be a `tuple`
+\endrst */
+template <typename T> T reinterpret_borrow(handle h) { return {h, object::borrowed_t{}}; }
+
+/** \rst
+    Like `reinterpret_borrow`, but steals the reference.
+
+     .. code-block:: cpp
+
+        PyObject *p = PyObject_Str(obj);
+        py::str s = reinterpret_steal<py::str>(p); // <-- `p` must be already be a `str`
+\endrst */
+template <typename T> T reinterpret_steal(handle h) { return {h, object::stolen_t{}}; }
+
+NAMESPACE_BEGIN(detail)
+inline std::string error_string();
+NAMESPACE_END(detail)
+
+/// Fetch and hold an error which was already set in Python.  An instance of this is typically
+/// thrown to propagate python-side errors back through C++ which can either be caught manually or
+/// else falls back to the function dispatcher (which then raises the captured error back to
+/// python).
+class error_already_set : public std::runtime_error {
+public:
+    /// Constructs a new exception from the current Python error indicator, if any.  The current
+    /// Python error indicator will be cleared.
+    error_already_set() : std::runtime_error(detail::error_string()) {
+        PyErr_Fetch(&m_type.ptr(), &m_value.ptr(), &m_trace.ptr());
+    }
+
+    error_already_set(const error_already_set &) = default;
+    error_already_set(error_already_set &&) = default;
+
+    inline ~error_already_set();
+
+    /// Give the currently-held error back to Python, if any.  If there is currently a Python error
+    /// already set it is cleared first.  After this call, the current object no longer stores the
+    /// error variables (but the `.what()` string is still available).
+    void restore() { PyErr_Restore(m_type.release().ptr(), m_value.release().ptr(), m_trace.release().ptr()); }
+
+    // Does nothing; provided for backwards compatibility.
+    PYBIND11_DEPRECATED("Use of error_already_set.clear() is deprecated")
+    void clear() {}
+
+    /// Check if the currently trapped error type matches the given Python exception class (or a
+    /// subclass thereof).  May also be passed a tuple to search for any exception class matches in
+    /// the given tuple.
+    bool matches(handle exc) const { return PyErr_GivenExceptionMatches(m_type.ptr(), exc.ptr()); }
+
+    const object& type() const { return m_type; }
+    const object& value() const { return m_value; }
+    const object& trace() const { return m_trace; }
+
+private:
+    object m_type, m_value, m_trace;
+};
+
+/** \defgroup python_builtins _
+    Unless stated otherwise, the following C++ functions behave the same
+    as their Python counterparts.
+ */
+
+/** \ingroup python_builtins
+    \rst
+    Return true if ``obj`` is an instance of ``T``. Type ``T`` must be a subclass of
+    `object` or a class which was exposed to Python as ``py::class_<T>``.
+\endrst */
+template <typename T, detail::enable_if_t<std::is_base_of<object, T>::value, int> = 0>
+bool isinstance(handle obj) { return T::check_(obj); }
+
+template <typename T, detail::enable_if_t<!std::is_base_of<object, T>::value, int> = 0>
+bool isinstance(handle obj) { return detail::isinstance_generic(obj, typeid(T)); }
+
+template <> inline bool isinstance<handle>(handle obj) = delete;
+template <> inline bool isinstance<object>(handle obj) { return obj.ptr() != nullptr; }
+
+/// \ingroup python_builtins
+/// Return true if ``obj`` is an instance of the ``type``.
+inline bool isinstance(handle obj, handle type) {
+    const auto result = PyObject_IsInstance(obj.ptr(), type.ptr());
+    if (result == -1)
+        throw error_already_set();
+    return result != 0;
+}
+
+/// \addtogroup python_builtins
+/// @{
+inline bool hasattr(handle obj, handle name) {
+    return PyObject_HasAttr(obj.ptr(), name.ptr()) == 1;
+}
+
+inline bool hasattr(handle obj, const char *name) {
+    return PyObject_HasAttrString(obj.ptr(), name) == 1;
+}
+
+inline void delattr(handle obj, handle name) {
+    if (PyObject_DelAttr(obj.ptr(), name.ptr()) != 0) { throw error_already_set(); }
+}
+
+inline void delattr(handle obj, const char *name) {
+    if (PyObject_DelAttrString(obj.ptr(), name) != 0) { throw error_already_set(); }
+}
+
+inline object getattr(handle obj, handle name) {
+    PyObject *result = PyObject_GetAttr(obj.ptr(), name.ptr());
+    if (!result) { throw error_already_set(); }
+    return reinterpret_steal<object>(result);
+}
+
+inline object getattr(handle obj, const char *name) {
+    PyObject *result = PyObject_GetAttrString(obj.ptr(), name);
+    if (!result) { throw error_already_set(); }
+    return reinterpret_steal<object>(result);
+}
+
+inline object getattr(handle obj, handle name, handle default_) {
+    if (PyObject *result = PyObject_GetAttr(obj.ptr(), name.ptr())) {
+        return reinterpret_steal<object>(result);
+    } else {
+        PyErr_Clear();
+        return reinterpret_borrow<object>(default_);
+    }
+}
+
+inline object getattr(handle obj, const char *name, handle default_) {
+    if (PyObject *result = PyObject_GetAttrString(obj.ptr(), name)) {
+        return reinterpret_steal<object>(result);
+    } else {
+        PyErr_Clear();
+        return reinterpret_borrow<object>(default_);
+    }
+}
+
+inline void setattr(handle obj, handle name, handle value) {
+    if (PyObject_SetAttr(obj.ptr(), name.ptr(), value.ptr()) != 0) { throw error_already_set(); }
+}
+
+inline void setattr(handle obj, const char *name, handle value) {
+    if (PyObject_SetAttrString(obj.ptr(), name, value.ptr()) != 0) { throw error_already_set(); }
+}
+
+inline ssize_t hash(handle obj) {
+    auto h = PyObject_Hash(obj.ptr());
+    if (h == -1) { throw error_already_set(); }
+    return h;
+}
+
+/// @} python_builtins
+
+NAMESPACE_BEGIN(detail)
+inline handle get_function(handle value) {
+    if (value) {
+#if PY_MAJOR_VERSION >= 3
+        if (PyInstanceMethod_Check(value.ptr()))
+            value = PyInstanceMethod_GET_FUNCTION(value.ptr());
+        else
+#endif
+        if (PyMethod_Check(value.ptr()))
+            value = PyMethod_GET_FUNCTION(value.ptr());
+    }
+    return value;
+}
+
+// Helper aliases/functions to support implicit casting of values given to python accessors/methods.
+// When given a pyobject, this simply returns the pyobject as-is; for other C++ type, the value goes
+// through pybind11::cast(obj) to convert it to an `object`.
+template <typename T, enable_if_t<is_pyobject<T>::value, int> = 0>
+auto object_or_cast(T &&o) -> decltype(std::forward<T>(o)) { return std::forward<T>(o); }
+// The following casting version is implemented in cast.h:
+template <typename T, enable_if_t<!is_pyobject<T>::value, int> = 0>
+object object_or_cast(T &&o);
+// Match a PyObject*, which we want to convert directly to handle via its converting constructor
+inline handle object_or_cast(PyObject *ptr) { return ptr; }
+
+template <typename Policy>
+class accessor : public object_api<accessor<Policy>> {
+    using key_type = typename Policy::key_type;
+
+public:
+    accessor(handle obj, key_type key) : obj(obj), key(std::move(key)) { }
+    accessor(const accessor &) = default;
+    accessor(accessor &&) = default;
+
+    // accessor overload required to override default assignment operator (templates are not allowed
+    // to replace default compiler-generated assignments).
+    void operator=(const accessor &a) && { std::move(*this).operator=(handle(a)); }
+    void operator=(const accessor &a) & { operator=(handle(a)); }
+
+    template <typename T> void operator=(T &&value) && {
+        Policy::set(obj, key, object_or_cast(std::forward<T>(value)));
+    }
+    template <typename T> void operator=(T &&value) & {
+        get_cache() = reinterpret_borrow<object>(object_or_cast(std::forward<T>(value)));
+    }
+
+    template <typename T = Policy>
+    PYBIND11_DEPRECATED("Use of obj.attr(...) as bool is deprecated in favor of pybind11::hasattr(obj, ...)")
+    explicit operator enable_if_t<std::is_same<T, accessor_policies::str_attr>::value ||
+            std::is_same<T, accessor_policies::obj_attr>::value, bool>() const {
+        return hasattr(obj, key);
+    }
+    template <typename T = Policy>
+    PYBIND11_DEPRECATED("Use of obj[key] as bool is deprecated in favor of obj.contains(key)")
+    explicit operator enable_if_t<std::is_same<T, accessor_policies::generic_item>::value, bool>() const {
+        return obj.contains(key);
+    }
+
+    operator object() const { return get_cache(); }
+    PyObject *ptr() const { return get_cache().ptr(); }
+    template <typename T> T cast() const { return get_cache().template cast<T>(); }
+
+private:
+    object &get_cache() const {
+        if (!cache) { cache = Policy::get(obj, key); }
+        return cache;
+    }
+
+private:
+    handle obj;
+    key_type key;
+    mutable object cache;
+};
+
+NAMESPACE_BEGIN(accessor_policies)
+struct obj_attr {
+    using key_type = object;
+    static object get(handle obj, handle key) { return getattr(obj, key); }
+    static void set(handle obj, handle key, handle val) { setattr(obj, key, val); }
+};
+
+struct str_attr {
+    using key_type = const char *;
+    static object get(handle obj, const char *key) { return getattr(obj, key); }
+    static void set(handle obj, const char *key, handle val) { setattr(obj, key, val); }
+};
+
+struct generic_item {
+    using key_type = object;
+
+    static object get(handle obj, handle key) {
+        PyObject *result = PyObject_GetItem(obj.ptr(), key.ptr());
+        if (!result) { throw error_already_set(); }
+        return reinterpret_steal<object>(result);
+    }
+
+    static void set(handle obj, handle key, handle val) {
+        if (PyObject_SetItem(obj.ptr(), key.ptr(), val.ptr()) != 0) { throw error_already_set(); }
+    }
+};
+
+struct sequence_item {
+    using key_type = size_t;
+
+    static object get(handle obj, size_t index) {
+        PyObject *result = PySequence_GetItem(obj.ptr(), static_cast<ssize_t>(index));
+        if (!result) { throw error_already_set(); }
+        return reinterpret_steal<object>(result);
+    }
+
+    static void set(handle obj, size_t index, handle val) {
+        // PySequence_SetItem does not steal a reference to 'val'
+        if (PySequence_SetItem(obj.ptr(), static_cast<ssize_t>(index), val.ptr()) != 0) {
+            throw error_already_set();
+        }
+    }
+};
+
+struct list_item {
+    using key_type = size_t;
+
+    static object get(handle obj, size_t index) {
+        PyObject *result = PyList_GetItem(obj.ptr(), static_cast<ssize_t>(index));
+        if (!result) { throw error_already_set(); }
+        return reinterpret_borrow<object>(result);
+    }
+
+    static void set(handle obj, size_t index, handle val) {
+        // PyList_SetItem steals a reference to 'val'
+        if (PyList_SetItem(obj.ptr(), static_cast<ssize_t>(index), val.inc_ref().ptr()) != 0) {
+            throw error_already_set();
+        }
+    }
+};
+
+struct tuple_item {
+    using key_type = size_t;
+
+    static object get(handle obj, size_t index) {
+        PyObject *result = PyTuple_GetItem(obj.ptr(), static_cast<ssize_t>(index));
+        if (!result) { throw error_already_set(); }
+        return reinterpret_borrow<object>(result);
+    }
+
+    static void set(handle obj, size_t index, handle val) {
+        // PyTuple_SetItem steals a reference to 'val'
+        if (PyTuple_SetItem(obj.ptr(), static_cast<ssize_t>(index), val.inc_ref().ptr()) != 0) {
+            throw error_already_set();
+        }
+    }
+};
+NAMESPACE_END(accessor_policies)
+
+/// STL iterator template used for tuple, list, sequence and dict
+template <typename Policy>
+class generic_iterator : public Policy {
+    using It = generic_iterator;
+
+public:
+    using difference_type = ssize_t;
+    using iterator_category = typename Policy::iterator_category;
+    using value_type = typename Policy::value_type;
+    using reference = typename Policy::reference;
+    using pointer = typename Policy::pointer;
+
+    generic_iterator() = default;
+    generic_iterator(handle seq, ssize_t index) : Policy(seq, index) { }
+
+    reference operator*() const { return Policy::dereference(); }
+    reference operator[](difference_type n) const { return *(*this + n); }
+    pointer operator->() const { return **this; }
+
+    It &operator++() { Policy::increment(); return *this; }
+    It operator++(int) { auto copy = *this; Policy::increment(); return copy; }
+    It &operator--() { Policy::decrement(); return *this; }
+    It operator--(int) { auto copy = *this; Policy::decrement(); return copy; }
+    It &operator+=(difference_type n) { Policy::advance(n); return *this; }
+    It &operator-=(difference_type n) { Policy::advance(-n); return *this; }
+
+    friend It operator+(const It &a, difference_type n) { auto copy = a; return copy += n; }
+    friend It operator+(difference_type n, const It &b) { return b + n; }
+    friend It operator-(const It &a, difference_type n) { auto copy = a; return copy -= n; }
+    friend difference_type operator-(const It &a, const It &b) { return a.distance_to(b); }
+
+    friend bool operator==(const It &a, const It &b) { return a.equal(b); }
+    friend bool operator!=(const It &a, const It &b) { return !(a == b); }
+    friend bool operator< (const It &a, const It &b) { return b - a > 0; }
+    friend bool operator> (const It &a, const It &b) { return b < a; }
+    friend bool operator>=(const It &a, const It &b) { return !(a < b); }
+    friend bool operator<=(const It &a, const It &b) { return !(a > b); }
+};
+
+NAMESPACE_BEGIN(iterator_policies)
+/// Quick proxy class needed to implement ``operator->`` for iterators which can't return pointers
+template <typename T>
+struct arrow_proxy {
+    T value;
+
+    arrow_proxy(T &&value) : value(std::move(value)) { }
+    T *operator->() const { return &value; }
+};
+
+/// Lightweight iterator policy using just a simple pointer: see ``PySequence_Fast_ITEMS``
+class sequence_fast_readonly {
+protected:
+    using iterator_category = std::random_access_iterator_tag;
+    using value_type = handle;
+    using reference = const handle;
+    using pointer = arrow_proxy<const handle>;
+
+    sequence_fast_readonly(handle obj, ssize_t n) : ptr(PySequence_Fast_ITEMS(obj.ptr()) + n) { }
+
+    reference dereference() const { return *ptr; }
+    void increment() { ++ptr; }
+    void decrement() { --ptr; }
+    void advance(ssize_t n) { ptr += n; }
+    bool equal(const sequence_fast_readonly &b) const { return ptr == b.ptr; }
+    ssize_t distance_to(const sequence_fast_readonly &b) const { return ptr - b.ptr; }
+
+private:
+    PyObject **ptr;
+};
+
+/// Full read and write access using the sequence protocol: see ``detail::sequence_accessor``
+class sequence_slow_readwrite {
+protected:
+    using iterator_category = std::random_access_iterator_tag;
+    using value_type = object;
+    using reference = sequence_accessor;
+    using pointer = arrow_proxy<const sequence_accessor>;
+
+    sequence_slow_readwrite(handle obj, ssize_t index) : obj(obj), index(index) { }
+
+    reference dereference() const { return {obj, static_cast<size_t>(index)}; }
+    void increment() { ++index; }
+    void decrement() { --index; }
+    void advance(ssize_t n) { index += n; }
+    bool equal(const sequence_slow_readwrite &b) const { return index == b.index; }
+    ssize_t distance_to(const sequence_slow_readwrite &b) const { return index - b.index; }
+
+private:
+    handle obj;
+    ssize_t index;
+};
+
+/// Python's dictionary protocol permits this to be a forward iterator
+class dict_readonly {
+protected:
+    using iterator_category = std::forward_iterator_tag;
+    using value_type = std::pair<handle, handle>;
+    using reference = const value_type;
+    using pointer = arrow_proxy<const value_type>;
+
+    dict_readonly() = default;
+    dict_readonly(handle obj, ssize_t pos) : obj(obj), pos(pos) { increment(); }
+
+    reference dereference() const { return {key, value}; }
+    void increment() { if (!PyDict_Next(obj.ptr(), &pos, &key, &value)) { pos = -1; } }
+    bool equal(const dict_readonly &b) const { return pos == b.pos; }
+
+private:
+    handle obj;
+    PyObject *key = nullptr, *value = nullptr;
+    ssize_t pos = -1;
+};
+NAMESPACE_END(iterator_policies)
+
+#if !defined(PYPY_VERSION)
+using tuple_iterator = generic_iterator<iterator_policies::sequence_fast_readonly>;
+using list_iterator = generic_iterator<iterator_policies::sequence_fast_readonly>;
+#else
+using tuple_iterator = generic_iterator<iterator_policies::sequence_slow_readwrite>;
+using list_iterator = generic_iterator<iterator_policies::sequence_slow_readwrite>;
+#endif
+
+using sequence_iterator = generic_iterator<iterator_policies::sequence_slow_readwrite>;
+using dict_iterator = generic_iterator<iterator_policies::dict_readonly>;
+
+inline bool PyIterable_Check(PyObject *obj) {
+    PyObject *iter = PyObject_GetIter(obj);
+    if (iter) {
+        Py_DECREF(iter);
+        return true;
+    } else {
+        PyErr_Clear();
+        return false;
+    }
+}
+
+inline bool PyNone_Check(PyObject *o) { return o == Py_None; }
+#if PY_MAJOR_VERSION >= 3
+inline bool PyEllipsis_Check(PyObject *o) { return o == Py_Ellipsis; }
+#endif
+
+inline bool PyUnicode_Check_Permissive(PyObject *o) { return PyUnicode_Check(o) || PYBIND11_BYTES_CHECK(o); }
+
+inline bool PyStaticMethod_Check(PyObject *o) { return o->ob_type == &PyStaticMethod_Type; }
+
+class kwargs_proxy : public handle {
+public:
+    explicit kwargs_proxy(handle h) : handle(h) { }
+};
+
+class args_proxy : public handle {
+public:
+    explicit args_proxy(handle h) : handle(h) { }
+    kwargs_proxy operator*() const { return kwargs_proxy(*this); }
+};
+
+/// Python argument categories (using PEP 448 terms)
+template <typename T> using is_keyword = std::is_base_of<arg, T>;
+template <typename T> using is_s_unpacking = std::is_same<args_proxy, T>; // * unpacking
+template <typename T> using is_ds_unpacking = std::is_same<kwargs_proxy, T>; // ** unpacking
+template <typename T> using is_positional = satisfies_none_of<T,
+    is_keyword, is_s_unpacking, is_ds_unpacking
+>;
+template <typename T> using is_keyword_or_ds = satisfies_any_of<T, is_keyword, is_ds_unpacking>;
+
+// Call argument collector forward declarations
+template <return_value_policy policy = return_value_policy::automatic_reference>
+class simple_collector;
+template <return_value_policy policy = return_value_policy::automatic_reference>
+class unpacking_collector;
+
+NAMESPACE_END(detail)
+
+// TODO: After the deprecated constructors are removed, this macro can be simplified by
+//       inheriting ctors: `using Parent::Parent`. It's not an option right now because
+//       the `using` statement triggers the parent deprecation warning even if the ctor
+//       isn't even used.
+#define PYBIND11_OBJECT_COMMON(Name, Parent, CheckFun) \
+    public: \
+        PYBIND11_DEPRECATED("Use reinterpret_borrow<"#Name">() or reinterpret_steal<"#Name">()") \
+        Name(handle h, bool is_borrowed) : Parent(is_borrowed ? Parent(h, borrowed_t{}) : Parent(h, stolen_t{})) { } \
+        Name(handle h, borrowed_t) : Parent(h, borrowed_t{}) { } \
+        Name(handle h, stolen_t) : Parent(h, stolen_t{}) { } \
+        PYBIND11_DEPRECATED("Use py::isinstance<py::python_type>(obj) instead") \
+        bool check() const { return m_ptr != nullptr && (bool) CheckFun(m_ptr); } \
+        static bool check_(handle h) { return h.ptr() != nullptr && CheckFun(h.ptr()); }
+
+#define PYBIND11_OBJECT_CVT(Name, Parent, CheckFun, ConvertFun) \
+    PYBIND11_OBJECT_COMMON(Name, Parent, CheckFun) \
+    /* This is deliberately not 'explicit' to allow implicit conversion from object: */ \
+    Name(const object &o) \
+    : Parent(check_(o) ? o.inc_ref().ptr() : ConvertFun(o.ptr()), stolen_t{}) \
+    { if (!m_ptr) throw error_already_set(); } \
+    Name(object &&o) \
+    : Parent(check_(o) ? o.release().ptr() : ConvertFun(o.ptr()), stolen_t{}) \
+    { if (!m_ptr) throw error_already_set(); } \
+    template <typename Policy_> \
+    Name(const ::pybind11::detail::accessor<Policy_> &a) : Name(object(a)) { }
+
+#define PYBIND11_OBJECT(Name, Parent, CheckFun) \
+    PYBIND11_OBJECT_COMMON(Name, Parent, CheckFun) \
+    /* This is deliberately not 'explicit' to allow implicit conversion from object: */ \
+    Name(const object &o) : Parent(o) { } \
+    Name(object &&o) : Parent(std::move(o)) { }
+
+#define PYBIND11_OBJECT_DEFAULT(Name, Parent, CheckFun) \
+    PYBIND11_OBJECT(Name, Parent, CheckFun) \
+    Name() : Parent() { }
+
+/// \addtogroup pytypes
+/// @{
+
+/** \rst
+    Wraps a Python iterator so that it can also be used as a C++ input iterator
+
+    Caveat: copying an iterator does not (and cannot) clone the internal
+    state of the Python iterable. This also applies to the post-increment
+    operator. This iterator should only be used to retrieve the current
+    value using ``operator*()``.
+\endrst */
+class iterator : public object {
+public:
+    using iterator_category = std::input_iterator_tag;
+    using difference_type = ssize_t;
+    using value_type = handle;
+    using reference = const handle;
+    using pointer = const handle *;
+
+    PYBIND11_OBJECT_DEFAULT(iterator, object, PyIter_Check)
+
+    iterator& operator++() {
+        advance();
+        return *this;
+    }
+
+    iterator operator++(int) {
+        auto rv = *this;
+        advance();
+        return rv;
+    }
+
+    reference operator*() const {
+        if (m_ptr && !value.ptr()) {
+            auto& self = const_cast<iterator &>(*this);
+            self.advance();
+        }
+        return value;
+    }
+
+    pointer operator->() const { operator*(); return &value; }
+
+    /** \rst
+         The value which marks the end of the iteration. ``it == iterator::sentinel()``
+         is equivalent to catching ``StopIteration`` in Python.
+
+         .. code-block:: cpp
+
+             void foo(py::iterator it) {
+                 while (it != py::iterator::sentinel()) {
+                    // use `*it`
+                    ++it;
+                 }
+             }
+    \endrst */
+    static iterator sentinel() { return {}; }
+
+    friend bool operator==(const iterator &a, const iterator &b) { return a->ptr() == b->ptr(); }
+    friend bool operator!=(const iterator &a, const iterator &b) { return a->ptr() != b->ptr(); }
+
+private:
+    void advance() {
+        value = reinterpret_steal<object>(PyIter_Next(m_ptr));
+        if (PyErr_Occurred()) { throw error_already_set(); }
+    }
+
+private:
+    object value = {};
+};
+
+class iterable : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(iterable, object, detail::PyIterable_Check)
+};
+
+class bytes;
+
+class str : public object {
+public:
+    PYBIND11_OBJECT_CVT(str, object, detail::PyUnicode_Check_Permissive, raw_str)
+
+    str(const char *c, size_t n)
+        : object(PyUnicode_FromStringAndSize(c, (ssize_t) n), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate string object!");
+    }
+
+    // 'explicit' is explicitly omitted from the following constructors to allow implicit conversion to py::str from C++ string-like objects
+    str(const char *c = "")
+        : object(PyUnicode_FromString(c), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate string object!");
+    }
+
+    str(const std::string &s) : str(s.data(), s.size()) { }
+
+    explicit str(const bytes &b);
+
+    /** \rst
+        Return a string representation of the object. This is analogous to
+        the ``str()`` function in Python.
+    \endrst */
+    explicit str(handle h) : object(raw_str(h.ptr()), stolen_t{}) { }
+
+    operator std::string() const {
+        object temp = *this;
+        if (PyUnicode_Check(m_ptr)) {
+            temp = reinterpret_steal<object>(PyUnicode_AsUTF8String(m_ptr));
+            if (!temp)
+                pybind11_fail("Unable to extract string contents! (encoding issue)");
+        }
+        char *buffer;
+        ssize_t length;
+        if (PYBIND11_BYTES_AS_STRING_AND_SIZE(temp.ptr(), &buffer, &length))
+            pybind11_fail("Unable to extract string contents! (invalid type)");
+        return std::string(buffer, (size_t) length);
+    }
+
+    template <typename... Args>
+    str format(Args &&...args) const {
+        return attr("format")(std::forward<Args>(args)...);
+    }
+
+private:
+    /// Return string representation -- always returns a new reference, even if already a str
+    static PyObject *raw_str(PyObject *op) {
+        PyObject *str_value = PyObject_Str(op);
+#if PY_MAJOR_VERSION < 3
+        if (!str_value) throw error_already_set();
+        PyObject *unicode = PyUnicode_FromEncodedObject(str_value, "utf-8", nullptr);
+        Py_XDECREF(str_value); str_value = unicode;
+#endif
+        return str_value;
+    }
+};
+/// @} pytypes
+
+inline namespace literals {
+/** \rst
+    String literal version of `str`
+ \endrst */
+inline str operator"" _s(const char *s, size_t size) { return {s, size}; }
+}
+
+/// \addtogroup pytypes
+/// @{
+class bytes : public object {
+public:
+    PYBIND11_OBJECT(bytes, object, PYBIND11_BYTES_CHECK)
+
+    // Allow implicit conversion:
+    bytes(const char *c = "")
+        : object(PYBIND11_BYTES_FROM_STRING(c), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate bytes object!");
+    }
+
+    bytes(const char *c, size_t n)
+        : object(PYBIND11_BYTES_FROM_STRING_AND_SIZE(c, (ssize_t) n), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate bytes object!");
+    }
+
+    // Allow implicit conversion:
+    bytes(const std::string &s) : bytes(s.data(), s.size()) { }
+
+    explicit bytes(const pybind11::str &s);
+
+    operator std::string() const {
+        char *buffer;
+        ssize_t length;
+        if (PYBIND11_BYTES_AS_STRING_AND_SIZE(m_ptr, &buffer, &length))
+            pybind11_fail("Unable to extract bytes contents!");
+        return std::string(buffer, (size_t) length);
+    }
+};
+
+inline bytes::bytes(const pybind11::str &s) {
+    object temp = s;
+    if (PyUnicode_Check(s.ptr())) {
+        temp = reinterpret_steal<object>(PyUnicode_AsUTF8String(s.ptr()));
+        if (!temp)
+            pybind11_fail("Unable to extract string contents! (encoding issue)");
+    }
+    char *buffer;
+    ssize_t length;
+    if (PYBIND11_BYTES_AS_STRING_AND_SIZE(temp.ptr(), &buffer, &length))
+        pybind11_fail("Unable to extract string contents! (invalid type)");
+    auto obj = reinterpret_steal<object>(PYBIND11_BYTES_FROM_STRING_AND_SIZE(buffer, length));
+    if (!obj)
+        pybind11_fail("Could not allocate bytes object!");
+    m_ptr = obj.release().ptr();
+}
+
+inline str::str(const bytes& b) {
+    char *buffer;
+    ssize_t length;
+    if (PYBIND11_BYTES_AS_STRING_AND_SIZE(b.ptr(), &buffer, &length))
+        pybind11_fail("Unable to extract bytes contents!");
+    auto obj = reinterpret_steal<object>(PyUnicode_FromStringAndSize(buffer, (ssize_t) length));
+    if (!obj)
+        pybind11_fail("Could not allocate string object!");
+    m_ptr = obj.release().ptr();
+}
+
+class none : public object {
+public:
+    PYBIND11_OBJECT(none, object, detail::PyNone_Check)
+    none() : object(Py_None, borrowed_t{}) { }
+};
+
+#if PY_MAJOR_VERSION >= 3
+class ellipsis : public object {
+public:
+    PYBIND11_OBJECT(ellipsis, object, detail::PyEllipsis_Check)
+    ellipsis() : object(Py_Ellipsis, borrowed_t{}) { }
+};
+#endif
+
+class bool_ : public object {
+public:
+    PYBIND11_OBJECT_CVT(bool_, object, PyBool_Check, raw_bool)
+    bool_() : object(Py_False, borrowed_t{}) { }
+    // Allow implicit conversion from and to `bool`:
+    bool_(bool value) : object(value ? Py_True : Py_False, borrowed_t{}) { }
+    operator bool() const { return m_ptr && PyLong_AsLong(m_ptr) != 0; }
+
+private:
+    /// Return the truth value of an object -- always returns a new reference
+    static PyObject *raw_bool(PyObject *op) {
+        const auto value = PyObject_IsTrue(op);
+        if (value == -1) return nullptr;
+        return handle(value ? Py_True : Py_False).inc_ref().ptr();
+    }
+};
+
+NAMESPACE_BEGIN(detail)
+// Converts a value to the given unsigned type.  If an error occurs, you get back (Unsigned) -1;
+// otherwise you get back the unsigned long or unsigned long long value cast to (Unsigned).
+// (The distinction is critically important when casting a returned -1 error value to some other
+// unsigned type: (A)-1 != (B)-1 when A and B are unsigned types of different sizes).
+template <typename Unsigned>
+Unsigned as_unsigned(PyObject *o) {
+    if (sizeof(Unsigned) <= sizeof(unsigned long)
+#if PY_VERSION_HEX < 0x03000000
+            || PyInt_Check(o)
+#endif
+    ) {
+        unsigned long v = PyLong_AsUnsignedLong(o);
+        return v == (unsigned long) -1 && PyErr_Occurred() ? (Unsigned) -1 : (Unsigned) v;
+    }
+    else {
+        unsigned long long v = PyLong_AsUnsignedLongLong(o);
+        return v == (unsigned long long) -1 && PyErr_Occurred() ? (Unsigned) -1 : (Unsigned) v;
+    }
+}
+NAMESPACE_END(detail)
+
+class int_ : public object {
+public:
+    PYBIND11_OBJECT_CVT(int_, object, PYBIND11_LONG_CHECK, PyNumber_Long)
+    int_() : object(PyLong_FromLong(0), stolen_t{}) { }
+    // Allow implicit conversion from C++ integral types:
+    template <typename T,
+              detail::enable_if_t<std::is_integral<T>::value, int> = 0>
+    int_(T value) {
+        if (sizeof(T) <= sizeof(long)) {
+            if (std::is_signed<T>::value)
+                m_ptr = PyLong_FromLong((long) value);
+            else
+                m_ptr = PyLong_FromUnsignedLong((unsigned long) value);
+        } else {
+            if (std::is_signed<T>::value)
+                m_ptr = PyLong_FromLongLong((long long) value);
+            else
+                m_ptr = PyLong_FromUnsignedLongLong((unsigned long long) value);
+        }
+        if (!m_ptr) pybind11_fail("Could not allocate int object!");
+    }
+
+    template <typename T,
+              detail::enable_if_t<std::is_integral<T>::value, int> = 0>
+    operator T() const {
+        return std::is_unsigned<T>::value
+            ? detail::as_unsigned<T>(m_ptr)
+            : sizeof(T) <= sizeof(long)
+              ? (T) PyLong_AsLong(m_ptr)
+              : (T) PYBIND11_LONG_AS_LONGLONG(m_ptr);
+    }
+};
+
+class float_ : public object {
+public:
+    PYBIND11_OBJECT_CVT(float_, object, PyFloat_Check, PyNumber_Float)
+    // Allow implicit conversion from float/double:
+    float_(float value) : object(PyFloat_FromDouble((double) value), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate float object!");
+    }
+    float_(double value = .0) : object(PyFloat_FromDouble((double) value), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate float object!");
+    }
+    operator float() const { return (float) PyFloat_AsDouble(m_ptr); }
+    operator double() const { return (double) PyFloat_AsDouble(m_ptr); }
+};
+
+class weakref : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(weakref, object, PyWeakref_Check)
+    explicit weakref(handle obj, handle callback = {})
+        : object(PyWeakref_NewRef(obj.ptr(), callback.ptr()), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate weak reference!");
+    }
+};
+
+class slice : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(slice, object, PySlice_Check)
+    slice(ssize_t start_, ssize_t stop_, ssize_t step_) {
+        int_ start(start_), stop(stop_), step(step_);
+        m_ptr = PySlice_New(start.ptr(), stop.ptr(), step.ptr());
+        if (!m_ptr) pybind11_fail("Could not allocate slice object!");
+    }
+    bool compute(size_t length, size_t *start, size_t *stop, size_t *step,
+                 size_t *slicelength) const {
+        return PySlice_GetIndicesEx((PYBIND11_SLICE_OBJECT *) m_ptr,
+                                    (ssize_t) length, (ssize_t *) start,
+                                    (ssize_t *) stop, (ssize_t *) step,
+                                    (ssize_t *) slicelength) == 0;
+    }
+    bool compute(ssize_t length, ssize_t *start, ssize_t *stop, ssize_t *step,
+      ssize_t *slicelength) const {
+      return PySlice_GetIndicesEx((PYBIND11_SLICE_OBJECT *) m_ptr,
+          length, start,
+          stop, step,
+          slicelength) == 0;
+    }
+};
+
+class capsule : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(capsule, object, PyCapsule_CheckExact)
+    PYBIND11_DEPRECATED("Use reinterpret_borrow<capsule>() or reinterpret_steal<capsule>()")
+    capsule(PyObject *ptr, bool is_borrowed) : object(is_borrowed ? object(ptr, borrowed_t{}) : object(ptr, stolen_t{})) { }
+
+    explicit capsule(const void *value, const char *name = nullptr, void (*destructor)(PyObject *) = nullptr)
+        : object(PyCapsule_New(const_cast<void *>(value), name, destructor), stolen_t{}) {
+        if (!m_ptr)
+            pybind11_fail("Could not allocate capsule object!");
+    }
+
+    PYBIND11_DEPRECATED("Please pass a destructor that takes a void pointer as input")
+    capsule(const void *value, void (*destruct)(PyObject *))
+        : object(PyCapsule_New(const_cast<void*>(value), nullptr, destruct), stolen_t{}) {
+        if (!m_ptr)
+            pybind11_fail("Could not allocate capsule object!");
+    }
+
+    capsule(const void *value, void (*destructor)(void *)) {
+        m_ptr = PyCapsule_New(const_cast<void *>(value), nullptr, [](PyObject *o) {
+            auto destructor = reinterpret_cast<void (*)(void *)>(PyCapsule_GetContext(o));
+            void *ptr = PyCapsule_GetPointer(o, nullptr);
+            destructor(ptr);
+        });
+
+        if (!m_ptr)
+            pybind11_fail("Could not allocate capsule object!");
+
+        if (PyCapsule_SetContext(m_ptr, (void *) destructor) != 0)
+            pybind11_fail("Could not set capsule context!");
+    }
+
+    capsule(void (*destructor)()) {
+        m_ptr = PyCapsule_New(reinterpret_cast<void *>(destructor), nullptr, [](PyObject *o) {
+            auto destructor = reinterpret_cast<void (*)()>(PyCapsule_GetPointer(o, nullptr));
+            destructor();
+        });
+
+        if (!m_ptr)
+            pybind11_fail("Could not allocate capsule object!");
+    }
+
+    template <typename T> operator T *() const {
+        auto name = this->name();
+        T * result = static_cast<T *>(PyCapsule_GetPointer(m_ptr, name));
+        if (!result) pybind11_fail("Unable to extract capsule contents!");
+        return result;
+    }
+
+    const char *name() const { return PyCapsule_GetName(m_ptr); }
+};
+
+class tuple : public object {
+public:
+    PYBIND11_OBJECT_CVT(tuple, object, PyTuple_Check, PySequence_Tuple)
+    explicit tuple(size_t size = 0) : object(PyTuple_New((ssize_t) size), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate tuple object!");
+    }
+    size_t size() const { return (size_t) PyTuple_Size(m_ptr); }
+    bool empty() const { return size() == 0; }
+    detail::tuple_accessor operator[](size_t index) const { return {*this, index}; }
+    detail::item_accessor operator[](handle h) const { return object::operator[](h); }
+    detail::tuple_iterator begin() const { return {*this, 0}; }
+    detail::tuple_iterator end() const { return {*this, PyTuple_GET_SIZE(m_ptr)}; }
+};
+
+class dict : public object {
+public:
+    PYBIND11_OBJECT_CVT(dict, object, PyDict_Check, raw_dict)
+    dict() : object(PyDict_New(), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate dict object!");
+    }
+    template <typename... Args,
+              typename = detail::enable_if_t<detail::all_of<detail::is_keyword_or_ds<Args>...>::value>,
+              // MSVC workaround: it can't compile an out-of-line definition, so defer the collector
+              typename collector = detail::deferred_t<detail::unpacking_collector<>, Args...>>
+    explicit dict(Args &&...args) : dict(collector(std::forward<Args>(args)...).kwargs()) { }
+
+    size_t size() const { return (size_t) PyDict_Size(m_ptr); }
+    bool empty() const { return size() == 0; }
+    detail::dict_iterator begin() const { return {*this, 0}; }
+    detail::dict_iterator end() const { return {}; }
+    void clear() const { PyDict_Clear(ptr()); }
+    template <typename T> bool contains(T &&key) const {
+        return PyDict_Contains(m_ptr, detail::object_or_cast(std::forward<T>(key)).ptr()) == 1;
+    }
+
+private:
+    /// Call the `dict` Python type -- always returns a new reference
+    static PyObject *raw_dict(PyObject *op) {
+        if (PyDict_Check(op))
+            return handle(op).inc_ref().ptr();
+        return PyObject_CallFunctionObjArgs((PyObject *) &PyDict_Type, op, nullptr);
+    }
+};
+
+class sequence : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(sequence, object, PySequence_Check)
+    size_t size() const { return (size_t) PySequence_Size(m_ptr); }
+    bool empty() const { return size() == 0; }
+    detail::sequence_accessor operator[](size_t index) const { return {*this, index}; }
+    detail::item_accessor operator[](handle h) const { return object::operator[](h); }
+    detail::sequence_iterator begin() const { return {*this, 0}; }
+    detail::sequence_iterator end() const { return {*this, PySequence_Size(m_ptr)}; }
+};
+
+class list : public object {
+public:
+    PYBIND11_OBJECT_CVT(list, object, PyList_Check, PySequence_List)
+    explicit list(size_t size = 0) : object(PyList_New((ssize_t) size), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate list object!");
+    }
+    size_t size() const { return (size_t) PyList_Size(m_ptr); }
+    bool empty() const { return size() == 0; }
+    detail::list_accessor operator[](size_t index) const { return {*this, index}; }
+    detail::item_accessor operator[](handle h) const { return object::operator[](h); }
+    detail::list_iterator begin() const { return {*this, 0}; }
+    detail::list_iterator end() const { return {*this, PyList_GET_SIZE(m_ptr)}; }
+    template <typename T> void append(T &&val) const {
+        PyList_Append(m_ptr, detail::object_or_cast(std::forward<T>(val)).ptr());
+    }
+    template <typename T> void insert(size_t index, T &&val) const {
+        PyList_Insert(m_ptr, static_cast<ssize_t>(index),
+            detail::object_or_cast(std::forward<T>(val)).ptr());
+    }
+};
+
+class args : public tuple { PYBIND11_OBJECT_DEFAULT(args, tuple, PyTuple_Check) };
+class kwargs : public dict { PYBIND11_OBJECT_DEFAULT(kwargs, dict, PyDict_Check)  };
+
+class set : public object {
+public:
+    PYBIND11_OBJECT_CVT(set, object, PySet_Check, PySet_New)
+    set() : object(PySet_New(nullptr), stolen_t{}) {
+        if (!m_ptr) pybind11_fail("Could not allocate set object!");
+    }
+    size_t size() const { return (size_t) PySet_Size(m_ptr); }
+    bool empty() const { return size() == 0; }
+    template <typename T> bool add(T &&val) const {
+        return PySet_Add(m_ptr, detail::object_or_cast(std::forward<T>(val)).ptr()) == 0;
+    }
+    void clear() const { PySet_Clear(m_ptr); }
+    template <typename T> bool contains(T &&val) const {
+        return PySet_Contains(m_ptr, detail::object_or_cast(std::forward<T>(val)).ptr()) == 1;
+    }
+};
+
+class function : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(function, object, PyCallable_Check)
+    handle cpp_function() const {
+        handle fun = detail::get_function(m_ptr);
+        if (fun && PyCFunction_Check(fun.ptr()))
+            return fun;
+        return handle();
+    }
+    bool is_cpp_function() const { return (bool) cpp_function(); }
+};
+
+class staticmethod : public object {
+public:
+    PYBIND11_OBJECT_CVT(staticmethod, object, detail::PyStaticMethod_Check, PyStaticMethod_New)
+};
+
+class buffer : public object {
+public:
+    PYBIND11_OBJECT_DEFAULT(buffer, object, PyObject_CheckBuffer)
+
+    buffer_info request(bool writable = false) const {
+        int flags = PyBUF_STRIDES | PyBUF_FORMAT;
+        if (writable) flags |= PyBUF_WRITABLE;
+        Py_buffer *view = new Py_buffer();
+        if (PyObject_GetBuffer(m_ptr, view, flags) != 0) {
+            delete view;
+            throw error_already_set();
+        }
+        return buffer_info(view);
+    }
+};
+
+class memoryview : public object {
+public:
+    explicit memoryview(const buffer_info& info) {
+        static Py_buffer buf { };
+        // Py_buffer uses signed sizes, strides and shape!..
+        static std::vector<Py_ssize_t> py_strides { };
+        static std::vector<Py_ssize_t> py_shape { };
+        buf.buf = info.ptr;
+        buf.itemsize = info.itemsize;
+        buf.format = const_cast<char *>(info.format.c_str());
+        buf.ndim = (int) info.ndim;
+        buf.len = info.size;
+        py_strides.clear();
+        py_shape.clear();
+        for (size_t i = 0; i < (size_t) info.ndim; ++i) {
+            py_strides.push_back(info.strides[i]);
+            py_shape.push_back(info.shape[i]);
+        }
+        buf.strides = py_strides.data();
+        buf.shape = py_shape.data();
+        buf.suboffsets = nullptr;
+        buf.readonly = info.readonly;
+        buf.internal = nullptr;
+
+        m_ptr = PyMemoryView_FromBuffer(&buf);
+        if (!m_ptr)
+            pybind11_fail("Unable to create memoryview from buffer descriptor");
+    }
+
+    PYBIND11_OBJECT_CVT(memoryview, object, PyMemoryView_Check, PyMemoryView_FromObject)
+};
+/// @} pytypes
+
+/// \addtogroup python_builtins
+/// @{
+inline size_t len(handle h) {
+    ssize_t result = PyObject_Length(h.ptr());
+    if (result < 0)
+        pybind11_fail("Unable to compute length of object");
+    return (size_t) result;
+}
+
+inline size_t len_hint(handle h) {
+#if PY_VERSION_HEX >= 0x03040000
+    ssize_t result = PyObject_LengthHint(h.ptr(), 0);
+#else
+    ssize_t result = PyObject_Length(h.ptr());
+#endif
+    if (result < 0) {
+        // Sometimes a length can't be determined at all (eg generators)
+        // In which case simply return 0
+        PyErr_Clear();
+        return 0;
+    }
+    return (size_t) result;
+}
+
+inline str repr(handle h) {
+    PyObject *str_value = PyObject_Repr(h.ptr());
+    if (!str_value) throw error_already_set();
+#if PY_MAJOR_VERSION < 3
+    PyObject *unicode = PyUnicode_FromEncodedObject(str_value, "utf-8", nullptr);
+    Py_XDECREF(str_value); str_value = unicode;
+    if (!str_value) throw error_already_set();
+#endif
+    return reinterpret_steal<str>(str_value);
+}
+
+inline iterator iter(handle obj) {
+    PyObject *result = PyObject_GetIter(obj.ptr());
+    if (!result) { throw error_already_set(); }
+    return reinterpret_steal<iterator>(result);
+}
+/// @} python_builtins
+
+NAMESPACE_BEGIN(detail)
+template <typename D> iterator object_api<D>::begin() const { return iter(derived()); }
+template <typename D> iterator object_api<D>::end() const { return iterator::sentinel(); }
+template <typename D> item_accessor object_api<D>::operator[](handle key) const {
+    return {derived(), reinterpret_borrow<object>(key)};
+}
+template <typename D> item_accessor object_api<D>::operator[](const char *key) const {
+    return {derived(), pybind11::str(key)};
+}
+template <typename D> obj_attr_accessor object_api<D>::attr(handle key) const {
+    return {derived(), reinterpret_borrow<object>(key)};
+}
+template <typename D> str_attr_accessor object_api<D>::attr(const char *key) const {
+    return {derived(), key};
+}
+template <typename D> args_proxy object_api<D>::operator*() const {
+    return args_proxy(derived().ptr());
+}
+template <typename D> template <typename T> bool object_api<D>::contains(T &&item) const {
+    return attr("__contains__")(std::forward<T>(item)).template cast<bool>();
+}
+
+template <typename D>
+pybind11::str object_api<D>::str() const { return pybind11::str(derived()); }
+
+template <typename D>
+str_attr_accessor object_api<D>::doc() const { return attr("__doc__"); }
+
+template <typename D>
+handle object_api<D>::get_type() const { return (PyObject *) Py_TYPE(derived().ptr()); }
+
+template <typename D>
+bool object_api<D>::rich_compare(object_api const &other, int value) const {
+    int rv = PyObject_RichCompareBool(derived().ptr(), other.derived().ptr(), value);
+    if (rv == -1)
+        throw error_already_set();
+    return rv == 1;
+}
+
+#define PYBIND11_MATH_OPERATOR_UNARY(op, fn)                                   \
+    template <typename D> object object_api<D>::op() const {                   \
+        object result = reinterpret_steal<object>(fn(derived().ptr()));        \
+        if (!result.ptr())                                                     \
+            throw error_already_set();                                         \
+        return result;                                                         \
+    }
+
+#define PYBIND11_MATH_OPERATOR_BINARY(op, fn)                                  \
+    template <typename D>                                                      \
+    object object_api<D>::op(object_api const &other) const {                  \
+        object result = reinterpret_steal<object>(                             \
+            fn(derived().ptr(), other.derived().ptr()));                       \
+        if (!result.ptr())                                                     \
+            throw error_already_set();                                         \
+        return result;                                                         \
+    }
+
+PYBIND11_MATH_OPERATOR_UNARY (operator~,   PyNumber_Invert)
+PYBIND11_MATH_OPERATOR_UNARY (operator-,   PyNumber_Negative)
+PYBIND11_MATH_OPERATOR_BINARY(operator+,   PyNumber_Add)
+PYBIND11_MATH_OPERATOR_BINARY(operator+=,  PyNumber_InPlaceAdd)
+PYBIND11_MATH_OPERATOR_BINARY(operator-,   PyNumber_Subtract)
+PYBIND11_MATH_OPERATOR_BINARY(operator-=,  PyNumber_InPlaceSubtract)
+PYBIND11_MATH_OPERATOR_BINARY(operator*,   PyNumber_Multiply)
+PYBIND11_MATH_OPERATOR_BINARY(operator*=,  PyNumber_InPlaceMultiply)
+PYBIND11_MATH_OPERATOR_BINARY(operator/,   PyNumber_TrueDivide)
+PYBIND11_MATH_OPERATOR_BINARY(operator/=,  PyNumber_InPlaceTrueDivide)
+PYBIND11_MATH_OPERATOR_BINARY(operator|,   PyNumber_Or)
+PYBIND11_MATH_OPERATOR_BINARY(operator|=,  PyNumber_InPlaceOr)
+PYBIND11_MATH_OPERATOR_BINARY(operator&,   PyNumber_And)
+PYBIND11_MATH_OPERATOR_BINARY(operator&=,  PyNumber_InPlaceAnd)
+PYBIND11_MATH_OPERATOR_BINARY(operator^,   PyNumber_Xor)
+PYBIND11_MATH_OPERATOR_BINARY(operator^=,  PyNumber_InPlaceXor)
+PYBIND11_MATH_OPERATOR_BINARY(operator<<,  PyNumber_Lshift)
+PYBIND11_MATH_OPERATOR_BINARY(operator<<=, PyNumber_InPlaceLshift)
+PYBIND11_MATH_OPERATOR_BINARY(operator>>,  PyNumber_Rshift)
+PYBIND11_MATH_OPERATOR_BINARY(operator>>=, PyNumber_InPlaceRshift)
+
+#undef PYBIND11_MATH_OPERATOR_UNARY
+#undef PYBIND11_MATH_OPERATOR_BINARY
+
+NAMESPACE_END(detail)
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/include/pybind11/stl.h b/3rdparty/pybind11/include/pybind11/stl.h
new file mode 100644
index 00000000..32f8d294
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/stl.h
@@ -0,0 +1,386 @@
+/*
+    pybind11/stl.h: Transparent conversion for STL data types
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "pybind11.h"
+#include <set>
+#include <unordered_set>
+#include <map>
+#include <unordered_map>
+#include <iostream>
+#include <list>
+#include <deque>
+#include <valarray>
+
+#if defined(_MSC_VER)
+#pragma warning(push)
+#pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#endif
+
+#ifdef __has_include
+// std::optional (but including it in c++14 mode isn't allowed)
+#  if defined(PYBIND11_CPP17) && __has_include(<optional>)
+#    include <optional>
+#    define PYBIND11_HAS_OPTIONAL 1
+#  endif
+// std::experimental::optional (but not allowed in c++11 mode)
+#  if defined(PYBIND11_CPP14) && (__has_include(<experimental/optional>) && \
+                                 !__has_include(<optional>))
+#    include <experimental/optional>
+#    define PYBIND11_HAS_EXP_OPTIONAL 1
+#  endif
+// std::variant
+#  if defined(PYBIND11_CPP17) && __has_include(<variant>)
+#    include <variant>
+#    define PYBIND11_HAS_VARIANT 1
+#  endif
+#elif defined(_MSC_VER) && defined(PYBIND11_CPP17)
+#  include <optional>
+#  include <variant>
+#  define PYBIND11_HAS_OPTIONAL 1
+#  define PYBIND11_HAS_VARIANT 1
+#endif
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+/// Extracts an const lvalue reference or rvalue reference for U based on the type of T (e.g. for
+/// forwarding a container element).  Typically used indirect via forwarded_type(), below.
+template <typename T, typename U>
+using forwarded_type = conditional_t<
+    std::is_lvalue_reference<T>::value, remove_reference_t<U> &, remove_reference_t<U> &&>;
+
+/// Forwards a value U as rvalue or lvalue according to whether T is rvalue or lvalue; typically
+/// used for forwarding a container's elements.
+template <typename T, typename U>
+forwarded_type<T, U> forward_like(U &&u) {
+    return std::forward<detail::forwarded_type<T, U>>(std::forward<U>(u));
+}
+
+template <typename Type, typename Key> struct set_caster {
+    using type = Type;
+    using key_conv = make_caster<Key>;
+
+    bool load(handle src, bool convert) {
+        if (!isinstance<pybind11::set>(src))
+            return false;
+        auto s = reinterpret_borrow<pybind11::set>(src);
+        value.clear();
+        for (auto entry : s) {
+            key_conv conv;
+            if (!conv.load(entry, convert))
+                return false;
+            value.insert(cast_op<Key &&>(std::move(conv)));
+        }
+        return true;
+    }
+
+    template <typename T>
+    static handle cast(T &&src, return_value_policy policy, handle parent) {
+        if (!std::is_lvalue_reference<T>::value)
+            policy = return_value_policy_override<Key>::policy(policy);
+        pybind11::set s;
+        for (auto &&value : src) {
+            auto value_ = reinterpret_steal<object>(key_conv::cast(forward_like<T>(value), policy, parent));
+            if (!value_ || !s.add(value_))
+                return handle();
+        }
+        return s.release();
+    }
+
+    PYBIND11_TYPE_CASTER(type, _("Set[") + key_conv::name + _("]"));
+};
+
+template <typename Type, typename Key, typename Value> struct map_caster {
+    using key_conv   = make_caster<Key>;
+    using value_conv = make_caster<Value>;
+
+    bool load(handle src, bool convert) {
+        if (!isinstance<dict>(src))
+            return false;
+        auto d = reinterpret_borrow<dict>(src);
+        value.clear();
+        for (auto it : d) {
+            key_conv kconv;
+            value_conv vconv;
+            if (!kconv.load(it.first.ptr(), convert) ||
+                !vconv.load(it.second.ptr(), convert))
+                return false;
+            value.emplace(cast_op<Key &&>(std::move(kconv)), cast_op<Value &&>(std::move(vconv)));
+        }
+        return true;
+    }
+
+    template <typename T>
+    static handle cast(T &&src, return_value_policy policy, handle parent) {
+        dict d;
+        return_value_policy policy_key = policy;
+        return_value_policy policy_value = policy;
+        if (!std::is_lvalue_reference<T>::value) {
+            policy_key = return_value_policy_override<Key>::policy(policy_key);
+            policy_value = return_value_policy_override<Value>::policy(policy_value);
+        }
+        for (auto &&kv : src) {
+            auto key = reinterpret_steal<object>(key_conv::cast(forward_like<T>(kv.first), policy_key, parent));
+            auto value = reinterpret_steal<object>(value_conv::cast(forward_like<T>(kv.second), policy_value, parent));
+            if (!key || !value)
+                return handle();
+            d[key] = value;
+        }
+        return d.release();
+    }
+
+    PYBIND11_TYPE_CASTER(Type, _("Dict[") + key_conv::name + _(", ") + value_conv::name + _("]"));
+};
+
+template <typename Type, typename Value> struct list_caster {
+    using value_conv = make_caster<Value>;
+
+    bool load(handle src, bool convert) {
+        if (!isinstance<sequence>(src) || isinstance<str>(src))
+            return false;
+        auto s = reinterpret_borrow<sequence>(src);
+        value.clear();
+        reserve_maybe(s, &value);
+        for (auto it : s) {
+            value_conv conv;
+            if (!conv.load(it, convert))
+                return false;
+            value.push_back(cast_op<Value &&>(std::move(conv)));
+        }
+        return true;
+    }
+
+private:
+    template <typename T = Type,
+              enable_if_t<std::is_same<decltype(std::declval<T>().reserve(0)), void>::value, int> = 0>
+    void reserve_maybe(sequence s, Type *) { value.reserve(s.size()); }
+    void reserve_maybe(sequence, void *) { }
+
+public:
+    template <typename T>
+    static handle cast(T &&src, return_value_policy policy, handle parent) {
+        if (!std::is_lvalue_reference<T>::value)
+            policy = return_value_policy_override<Value>::policy(policy);
+        list l(src.size());
+        size_t index = 0;
+        for (auto &&value : src) {
+            auto value_ = reinterpret_steal<object>(value_conv::cast(forward_like<T>(value), policy, parent));
+            if (!value_)
+                return handle();
+            PyList_SET_ITEM(l.ptr(), (ssize_t) index++, value_.release().ptr()); // steals a reference
+        }
+        return l.release();
+    }
+
+    PYBIND11_TYPE_CASTER(Type, _("List[") + value_conv::name + _("]"));
+};
+
+template <typename Type, typename Alloc> struct type_caster<std::vector<Type, Alloc>>
+ : list_caster<std::vector<Type, Alloc>, Type> { };
+
+template <typename Type, typename Alloc> struct type_caster<std::deque<Type, Alloc>>
+ : list_caster<std::deque<Type, Alloc>, Type> { };
+
+template <typename Type, typename Alloc> struct type_caster<std::list<Type, Alloc>>
+ : list_caster<std::list<Type, Alloc>, Type> { };
+
+template <typename ArrayType, typename Value, bool Resizable, size_t Size = 0> struct array_caster {
+    using value_conv = make_caster<Value>;
+
+private:
+    template <bool R = Resizable>
+    bool require_size(enable_if_t<R, size_t> size) {
+        if (value.size() != size)
+            value.resize(size);
+        return true;
+    }
+    template <bool R = Resizable>
+    bool require_size(enable_if_t<!R, size_t> size) {
+        return size == Size;
+    }
+
+public:
+    bool load(handle src, bool convert) {
+        if (!isinstance<sequence>(src))
+            return false;
+        auto l = reinterpret_borrow<sequence>(src);
+        if (!require_size(l.size()))
+            return false;
+        size_t ctr = 0;
+        for (auto it : l) {
+            value_conv conv;
+            if (!conv.load(it, convert))
+                return false;
+            value[ctr++] = cast_op<Value &&>(std::move(conv));
+        }
+        return true;
+    }
+
+    template <typename T>
+    static handle cast(T &&src, return_value_policy policy, handle parent) {
+        list l(src.size());
+        size_t index = 0;
+        for (auto &&value : src) {
+            auto value_ = reinterpret_steal<object>(value_conv::cast(forward_like<T>(value), policy, parent));
+            if (!value_)
+                return handle();
+            PyList_SET_ITEM(l.ptr(), (ssize_t) index++, value_.release().ptr()); // steals a reference
+        }
+        return l.release();
+    }
+
+    PYBIND11_TYPE_CASTER(ArrayType, _("List[") + value_conv::name + _<Resizable>(_(""), _("[") + _<Size>() + _("]")) + _("]"));
+};
+
+template <typename Type, size_t Size> struct type_caster<std::array<Type, Size>>
+ : array_caster<std::array<Type, Size>, Type, false, Size> { };
+
+template <typename Type> struct type_caster<std::valarray<Type>>
+ : array_caster<std::valarray<Type>, Type, true> { };
+
+template <typename Key, typename Compare, typename Alloc> struct type_caster<std::set<Key, Compare, Alloc>>
+  : set_caster<std::set<Key, Compare, Alloc>, Key> { };
+
+template <typename Key, typename Hash, typename Equal, typename Alloc> struct type_caster<std::unordered_set<Key, Hash, Equal, Alloc>>
+  : set_caster<std::unordered_set<Key, Hash, Equal, Alloc>, Key> { };
+
+template <typename Key, typename Value, typename Compare, typename Alloc> struct type_caster<std::map<Key, Value, Compare, Alloc>>
+  : map_caster<std::map<Key, Value, Compare, Alloc>, Key, Value> { };
+
+template <typename Key, typename Value, typename Hash, typename Equal, typename Alloc> struct type_caster<std::unordered_map<Key, Value, Hash, Equal, Alloc>>
+  : map_caster<std::unordered_map<Key, Value, Hash, Equal, Alloc>, Key, Value> { };
+
+// This type caster is intended to be used for std::optional and std::experimental::optional
+template<typename T> struct optional_caster {
+    using value_conv = make_caster<typename T::value_type>;
+
+    template <typename T_>
+    static handle cast(T_ &&src, return_value_policy policy, handle parent) {
+        if (!src)
+            return none().inc_ref();
+        policy = return_value_policy_override<typename T::value_type>::policy(policy);
+        return value_conv::cast(*std::forward<T_>(src), policy, parent);
+    }
+
+    bool load(handle src, bool convert) {
+        if (!src) {
+            return false;
+        } else if (src.is_none()) {
+            return true;  // default-constructed value is already empty
+        }
+        value_conv inner_caster;
+        if (!inner_caster.load(src, convert))
+            return false;
+
+        value.emplace(cast_op<typename T::value_type &&>(std::move(inner_caster)));
+        return true;
+    }
+
+    PYBIND11_TYPE_CASTER(T, _("Optional[") + value_conv::name + _("]"));
+};
+
+#if PYBIND11_HAS_OPTIONAL
+template<typename T> struct type_caster<std::optional<T>>
+    : public optional_caster<std::optional<T>> {};
+
+template<> struct type_caster<std::nullopt_t>
+    : public void_caster<std::nullopt_t> {};
+#endif
+
+#if PYBIND11_HAS_EXP_OPTIONAL
+template<typename T> struct type_caster<std::experimental::optional<T>>
+    : public optional_caster<std::experimental::optional<T>> {};
+
+template<> struct type_caster<std::experimental::nullopt_t>
+    : public void_caster<std::experimental::nullopt_t> {};
+#endif
+
+/// Visit a variant and cast any found type to Python
+struct variant_caster_visitor {
+    return_value_policy policy;
+    handle parent;
+
+    using result_type = handle; // required by boost::variant in C++11
+
+    template <typename T>
+    result_type operator()(T &&src) const {
+        return make_caster<T>::cast(std::forward<T>(src), policy, parent);
+    }
+};
+
+/// Helper class which abstracts away variant's `visit` function. `std::variant` and similar
+/// `namespace::variant` types which provide a `namespace::visit()` function are handled here
+/// automatically using argument-dependent lookup. Users can provide specializations for other
+/// variant-like classes, e.g. `boost::variant` and `boost::apply_visitor`.
+template <template<typename...> class Variant>
+struct visit_helper {
+    template <typename... Args>
+    static auto call(Args &&...args) -> decltype(visit(std::forward<Args>(args)...)) {
+        return visit(std::forward<Args>(args)...);
+    }
+};
+
+/// Generic variant caster
+template <typename Variant> struct variant_caster;
+
+template <template<typename...> class V, typename... Ts>
+struct variant_caster<V<Ts...>> {
+    static_assert(sizeof...(Ts) > 0, "Variant must consist of at least one alternative.");
+
+    template <typename U, typename... Us>
+    bool load_alternative(handle src, bool convert, type_list<U, Us...>) {
+        auto caster = make_caster<U>();
+        if (caster.load(src, convert)) {
+            value = cast_op<U>(caster);
+            return true;
+        }
+        return load_alternative(src, convert, type_list<Us...>{});
+    }
+
+    bool load_alternative(handle, bool, type_list<>) { return false; }
+
+    bool load(handle src, bool convert) {
+        // Do a first pass without conversions to improve constructor resolution.
+        // E.g. `py::int_(1).cast<variant<double, int>>()` needs to fill the `int`
+        // slot of the variant. Without two-pass loading `double` would be filled
+        // because it appears first and a conversion is possible.
+        if (convert && load_alternative(src, false, type_list<Ts...>{}))
+            return true;
+        return load_alternative(src, convert, type_list<Ts...>{});
+    }
+
+    template <typename Variant>
+    static handle cast(Variant &&src, return_value_policy policy, handle parent) {
+        return visit_helper<V>::call(variant_caster_visitor{policy, parent},
+                                     std::forward<Variant>(src));
+    }
+
+    using Type = V<Ts...>;
+    PYBIND11_TYPE_CASTER(Type, _("Union[") + detail::concat(make_caster<Ts>::name...) + _("]"));
+};
+
+#if PYBIND11_HAS_VARIANT
+template <typename... Ts>
+struct type_caster<std::variant<Ts...>> : variant_caster<std::variant<Ts...>> { };
+#endif
+
+NAMESPACE_END(detail)
+
+inline std::ostream &operator<<(std::ostream &os, const handle &obj) {
+    os << (std::string) str(obj);
+    return os;
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
+
+#if defined(_MSC_VER)
+#pragma warning(pop)
+#endif
diff --git a/3rdparty/pybind11/include/pybind11/stl_bind.h b/3rdparty/pybind11/include/pybind11/stl_bind.h
new file mode 100644
index 00000000..da233eca
--- /dev/null
+++ b/3rdparty/pybind11/include/pybind11/stl_bind.h
@@ -0,0 +1,656 @@
+/*
+    pybind11/std_bind.h: Binding generators for STL data types
+
+    Copyright (c) 2016 Sergey Lyskov and Wenzel Jakob
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#pragma once
+
+#include "detail/common.h"
+#include "operators.h"
+
+#include <algorithm>
+#include <sstream>
+
+NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
+NAMESPACE_BEGIN(detail)
+
+/* SFINAE helper class used by 'is_comparable */
+template <typename T>  struct container_traits {
+    template <typename T2> static std::true_type test_comparable(decltype(std::declval<const T2 &>() == std::declval<const T2 &>())*);
+    template <typename T2> static std::false_type test_comparable(...);
+    template <typename T2> static std::true_type test_value(typename T2::value_type *);
+    template <typename T2> static std::false_type test_value(...);
+    template <typename T2> static std::true_type test_pair(typename T2::first_type *, typename T2::second_type *);
+    template <typename T2> static std::false_type test_pair(...);
+
+    static constexpr const bool is_comparable = std::is_same<std::true_type, decltype(test_comparable<T>(nullptr))>::value;
+    static constexpr const bool is_pair = std::is_same<std::true_type, decltype(test_pair<T>(nullptr, nullptr))>::value;
+    static constexpr const bool is_vector = std::is_same<std::true_type, decltype(test_value<T>(nullptr))>::value;
+    static constexpr const bool is_element = !is_pair && !is_vector;
+};
+
+/* Default: is_comparable -> std::false_type */
+template <typename T, typename SFINAE = void>
+struct is_comparable : std::false_type { };
+
+/* For non-map data structures, check whether operator== can be instantiated */
+template <typename T>
+struct is_comparable<
+    T, enable_if_t<container_traits<T>::is_element &&
+                   container_traits<T>::is_comparable>>
+    : std::true_type { };
+
+/* For a vector/map data structure, recursively check the value type (which is std::pair for maps) */
+template <typename T>
+struct is_comparable<T, enable_if_t<container_traits<T>::is_vector>> {
+    static constexpr const bool value =
+        is_comparable<typename T::value_type>::value;
+};
+
+/* For pairs, recursively check the two data types */
+template <typename T>
+struct is_comparable<T, enable_if_t<container_traits<T>::is_pair>> {
+    static constexpr const bool value =
+        is_comparable<typename T::first_type>::value &&
+        is_comparable<typename T::second_type>::value;
+};
+
+/* Fallback functions */
+template <typename, typename, typename... Args> void vector_if_copy_constructible(const Args &...) { }
+template <typename, typename, typename... Args> void vector_if_equal_operator(const Args &...) { }
+template <typename, typename, typename... Args> void vector_if_insertion_operator(const Args &...) { }
+template <typename, typename, typename... Args> void vector_modifiers(const Args &...) { }
+
+template<typename Vector, typename Class_>
+void vector_if_copy_constructible(enable_if_t<is_copy_constructible<Vector>::value, Class_> &cl) {
+    cl.def(init<const Vector &>(), "Copy constructor");
+}
+
+template<typename Vector, typename Class_>
+void vector_if_equal_operator(enable_if_t<is_comparable<Vector>::value, Class_> &cl) {
+    using T = typename Vector::value_type;
+
+    cl.def(self == self);
+    cl.def(self != self);
+
+    cl.def("count",
+        [](const Vector &v, const T &x) {
+            return std::count(v.begin(), v.end(), x);
+        },
+        arg("x"),
+        "Return the number of times ``x`` appears in the list"
+    );
+
+    cl.def("remove", [](Vector &v, const T &x) {
+            auto p = std::find(v.begin(), v.end(), x);
+            if (p != v.end())
+                v.erase(p);
+            else
+                throw value_error();
+        },
+        arg("x"),
+        "Remove the first item from the list whose value is x. "
+        "It is an error if there is no such item."
+    );
+
+    cl.def("__contains__",
+        [](const Vector &v, const T &x) {
+            return std::find(v.begin(), v.end(), x) != v.end();
+        },
+        arg("x"),
+        "Return true the container contains ``x``"
+    );
+}
+
+// Vector modifiers -- requires a copyable vector_type:
+// (Technically, some of these (pop and __delitem__) don't actually require copyability, but it seems
+// silly to allow deletion but not insertion, so include them here too.)
+template <typename Vector, typename Class_>
+void vector_modifiers(enable_if_t<is_copy_constructible<typename Vector::value_type>::value, Class_> &cl) {
+    using T = typename Vector::value_type;
+    using SizeType = typename Vector::size_type;
+    using DiffType = typename Vector::difference_type;
+
+    auto wrap_i = [](DiffType i, SizeType n) {
+        if (i < 0)
+            i += n;
+        if (i < 0 || (SizeType)i >= n)
+            throw index_error();
+        return i;
+    };
+
+    cl.def("append",
+           [](Vector &v, const T &value) { v.push_back(value); },
+           arg("x"),
+           "Add an item to the end of the list");
+
+    cl.def(init([](iterable it) {
+        auto v = std::unique_ptr<Vector>(new Vector());
+        v->reserve(len_hint(it));
+        for (handle h : it)
+           v->push_back(h.cast<T>());
+        return v.release();
+    }));
+
+    cl.def("clear",
+        [](Vector &v) {
+            v.clear();
+        },
+        "Clear the contents"
+    );
+
+    cl.def("extend",
+       [](Vector &v, const Vector &src) {
+           v.insert(v.end(), src.begin(), src.end());
+       },
+       arg("L"),
+       "Extend the list by appending all the items in the given list"
+    );
+
+    cl.def("extend",
+       [](Vector &v, iterable it) {
+           const size_t old_size = v.size();
+           v.reserve(old_size + len_hint(it));
+           try {
+               for (handle h : it) {
+                   v.push_back(h.cast<T>());
+               }
+           } catch (const cast_error &) {
+               v.erase(v.begin() + static_cast<typename Vector::difference_type>(old_size), v.end());
+               try {
+                   v.shrink_to_fit();
+               } catch (const std::exception &) {
+                   // Do nothing
+               }
+               throw;
+           }
+       },
+       arg("L"),
+       "Extend the list by appending all the items in the given list"
+    );
+
+    cl.def("insert",
+        [](Vector &v, DiffType i, const T &x) {
+            // Can't use wrap_i; i == v.size() is OK
+            if (i < 0)
+                i += v.size();
+            if (i < 0 || (SizeType)i > v.size())
+                throw index_error();
+            v.insert(v.begin() + i, x);
+        },
+        arg("i") , arg("x"),
+        "Insert an item at a given position."
+    );
+
+    cl.def("pop",
+        [](Vector &v) {
+            if (v.empty())
+                throw index_error();
+            T t = v.back();
+            v.pop_back();
+            return t;
+        },
+        "Remove and return the last item"
+    );
+
+    cl.def("pop",
+        [wrap_i](Vector &v, DiffType i) {
+            i = wrap_i(i, v.size());
+            T t = v[(SizeType) i];
+            v.erase(v.begin() + i);
+            return t;
+        },
+        arg("i"),
+        "Remove and return the item at index ``i``"
+    );
+
+    cl.def("__setitem__",
+        [wrap_i](Vector &v, DiffType i, const T &t) {
+            i = wrap_i(i, v.size());
+            v[(SizeType)i] = t;
+        }
+    );
+
+    /// Slicing protocol
+    cl.def("__getitem__",
+        [](const Vector &v, slice slice) -> Vector * {
+            size_t start, stop, step, slicelength;
+
+            if (!slice.compute(v.size(), &start, &stop, &step, &slicelength))
+                throw error_already_set();
+
+            Vector *seq = new Vector();
+            seq->reserve((size_t) slicelength);
+
+            for (size_t i=0; i<slicelength; ++i) {
+                seq->push_back(v[start]);
+                start += step;
+            }
+            return seq;
+        },
+        arg("s"),
+        "Retrieve list elements using a slice object"
+    );
+
+    cl.def("__setitem__",
+        [](Vector &v, slice slice,  const Vector &value) {
+            size_t start, stop, step, slicelength;
+            if (!slice.compute(v.size(), &start, &stop, &step, &slicelength))
+                throw error_already_set();
+
+            if (slicelength != value.size())
+                throw std::runtime_error("Left and right hand size of slice assignment have different sizes!");
+
+            for (size_t i=0; i<slicelength; ++i) {
+                v[start] = value[i];
+                start += step;
+            }
+        },
+        "Assign list elements using a slice object"
+    );
+
+    cl.def("__delitem__",
+        [wrap_i](Vector &v, DiffType i) {
+            i = wrap_i(i, v.size());
+            v.erase(v.begin() + i);
+        },
+        "Delete the list elements at index ``i``"
+    );
+
+    cl.def("__delitem__",
+        [](Vector &v, slice slice) {
+            size_t start, stop, step, slicelength;
+
+            if (!slice.compute(v.size(), &start, &stop, &step, &slicelength))
+                throw error_already_set();
+
+            if (step == 1 && false) {
+                v.erase(v.begin() + (DiffType) start, v.begin() + DiffType(start + slicelength));
+            } else {
+                for (size_t i = 0; i < slicelength; ++i) {
+                    v.erase(v.begin() + DiffType(start));
+                    start += step - 1;
+                }
+            }
+        },
+        "Delete list elements using a slice object"
+    );
+
+}
+
+// If the type has an operator[] that doesn't return a reference (most notably std::vector<bool>),
+// we have to access by copying; otherwise we return by reference.
+template <typename Vector> using vector_needs_copy = negation<
+    std::is_same<decltype(std::declval<Vector>()[typename Vector::size_type()]), typename Vector::value_type &>>;
+
+// The usual case: access and iterate by reference
+template <typename Vector, typename Class_>
+void vector_accessor(enable_if_t<!vector_needs_copy<Vector>::value, Class_> &cl) {
+    using T = typename Vector::value_type;
+    using SizeType = typename Vector::size_type;
+    using DiffType = typename Vector::difference_type;
+    using ItType   = typename Vector::iterator;
+
+    auto wrap_i = [](DiffType i, SizeType n) {
+        if (i < 0)
+            i += n;
+        if (i < 0 || (SizeType)i >= n)
+            throw index_error();
+        return i;
+    };
+
+    cl.def("__getitem__",
+        [wrap_i](Vector &v, DiffType i) -> T & {
+            i = wrap_i(i, v.size());
+            return v[(SizeType)i];
+        },
+        return_value_policy::reference_internal // ref + keepalive
+    );
+
+    cl.def("__iter__",
+           [](Vector &v) {
+               return make_iterator<
+                   return_value_policy::reference_internal, ItType, ItType, T&>(
+                   v.begin(), v.end());
+           },
+           keep_alive<0, 1>() /* Essential: keep list alive while iterator exists */
+    );
+}
+
+// The case for special objects, like std::vector<bool>, that have to be returned-by-copy:
+template <typename Vector, typename Class_>
+void vector_accessor(enable_if_t<vector_needs_copy<Vector>::value, Class_> &cl) {
+    using T = typename Vector::value_type;
+    using SizeType = typename Vector::size_type;
+    using DiffType = typename Vector::difference_type;
+    using ItType   = typename Vector::iterator;
+    cl.def("__getitem__",
+        [](const Vector &v, DiffType i) -> T {
+            if (i < 0 && (i += v.size()) < 0)
+                throw index_error();
+            if ((SizeType)i >= v.size())
+                throw index_error();
+            return v[(SizeType)i];
+        }
+    );
+
+    cl.def("__iter__",
+           [](Vector &v) {
+               return make_iterator<
+                   return_value_policy::copy, ItType, ItType, T>(
+                   v.begin(), v.end());
+           },
+           keep_alive<0, 1>() /* Essential: keep list alive while iterator exists */
+    );
+}
+
+template <typename Vector, typename Class_> auto vector_if_insertion_operator(Class_ &cl, std::string const &name)
+    -> decltype(std::declval<std::ostream&>() << std::declval<typename Vector::value_type>(), void()) {
+    using size_type = typename Vector::size_type;
+
+    cl.def("__repr__",
+           [name](Vector &v) {
+            std::ostringstream s;
+            s << name << '[';
+            for (size_type i=0; i < v.size(); ++i) {
+                s << v[i];
+                if (i != v.size() - 1)
+                    s << ", ";
+            }
+            s << ']';
+            return s.str();
+        },
+        "Return the canonical string representation of this list."
+    );
+}
+
+// Provide the buffer interface for vectors if we have data() and we have a format for it
+// GCC seems to have "void std::vector<bool>::data()" - doing SFINAE on the existence of data() is insufficient, we need to check it returns an appropriate pointer
+template <typename Vector, typename = void>
+struct vector_has_data_and_format : std::false_type {};
+template <typename Vector>
+struct vector_has_data_and_format<Vector, enable_if_t<std::is_same<decltype(format_descriptor<typename Vector::value_type>::format(), std::declval<Vector>().data()), typename Vector::value_type*>::value>> : std::true_type {};
+
+// Add the buffer interface to a vector
+template <typename Vector, typename Class_, typename... Args>
+enable_if_t<detail::any_of<std::is_same<Args, buffer_protocol>...>::value>
+vector_buffer(Class_& cl) {
+    using T = typename Vector::value_type;
+
+    static_assert(vector_has_data_and_format<Vector>::value, "There is not an appropriate format descriptor for this vector");
+
+    // numpy.h declares this for arbitrary types, but it may raise an exception and crash hard at runtime if PYBIND11_NUMPY_DTYPE hasn't been called, so check here
+    format_descriptor<T>::format();
+
+    cl.def_buffer([](Vector& v) -> buffer_info {
+        return buffer_info(v.data(), static_cast<ssize_t>(sizeof(T)), format_descriptor<T>::format(), 1, {v.size()}, {sizeof(T)});
+    });
+
+    cl.def(init([](buffer buf) {
+        auto info = buf.request();
+        if (info.ndim != 1 || info.strides[0] % static_cast<ssize_t>(sizeof(T)))
+            throw type_error("Only valid 1D buffers can be copied to a vector");
+        if (!detail::compare_buffer_info<T>::compare(info) || (ssize_t) sizeof(T) != info.itemsize)
+            throw type_error("Format mismatch (Python: " + info.format + " C++: " + format_descriptor<T>::format() + ")");
+
+        auto vec = std::unique_ptr<Vector>(new Vector());
+        vec->reserve((size_t) info.shape[0]);
+        T *p = static_cast<T*>(info.ptr);
+        ssize_t step = info.strides[0] / static_cast<ssize_t>(sizeof(T));
+        T *end = p + info.shape[0] * step;
+        for (; p != end; p += step)
+            vec->push_back(*p);
+        return vec.release();
+    }));
+
+    return;
+}
+
+template <typename Vector, typename Class_, typename... Args>
+enable_if_t<!detail::any_of<std::is_same<Args, buffer_protocol>...>::value> vector_buffer(Class_&) {}
+
+NAMESPACE_END(detail)
+
+//
+// std::vector
+//
+template <typename Vector, typename holder_type = std::unique_ptr<Vector>, typename... Args>
+class_<Vector, holder_type> bind_vector(handle scope, std::string const &name, Args&&... args) {
+    using Class_ = class_<Vector, holder_type>;
+
+    // If the value_type is unregistered (e.g. a converting type) or is itself registered
+    // module-local then make the vector binding module-local as well:
+    using vtype = typename Vector::value_type;
+    auto vtype_info = detail::get_type_info(typeid(vtype));
+    bool local = !vtype_info || vtype_info->module_local;
+
+    Class_ cl(scope, name.c_str(), pybind11::module_local(local), std::forward<Args>(args)...);
+
+    // Declare the buffer interface if a buffer_protocol() is passed in
+    detail::vector_buffer<Vector, Class_, Args...>(cl);
+
+    cl.def(init<>());
+
+    // Register copy constructor (if possible)
+    detail::vector_if_copy_constructible<Vector, Class_>(cl);
+
+    // Register comparison-related operators and functions (if possible)
+    detail::vector_if_equal_operator<Vector, Class_>(cl);
+
+    // Register stream insertion operator (if possible)
+    detail::vector_if_insertion_operator<Vector, Class_>(cl, name);
+
+    // Modifiers require copyable vector value type
+    detail::vector_modifiers<Vector, Class_>(cl);
+
+    // Accessor and iterator; return by value if copyable, otherwise we return by ref + keep-alive
+    detail::vector_accessor<Vector, Class_>(cl);
+
+    cl.def("__bool__",
+        [](const Vector &v) -> bool {
+            return !v.empty();
+        },
+        "Check whether the list is nonempty"
+    );
+
+    cl.def("__len__", &Vector::size);
+
+
+
+
+#if 0
+    // C++ style functions deprecated, leaving it here as an example
+    cl.def(init<size_type>());
+
+    cl.def("resize",
+         (void (Vector::*) (size_type count)) & Vector::resize,
+         "changes the number of elements stored");
+
+    cl.def("erase",
+        [](Vector &v, SizeType i) {
+        if (i >= v.size())
+            throw index_error();
+        v.erase(v.begin() + i);
+    }, "erases element at index ``i``");
+
+    cl.def("empty",         &Vector::empty,         "checks whether the container is empty");
+    cl.def("size",          &Vector::size,          "returns the number of elements");
+    cl.def("push_back", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
+    cl.def("pop_back",                               &Vector::pop_back, "removes the last element");
+
+    cl.def("max_size",      &Vector::max_size,      "returns the maximum possible number of elements");
+    cl.def("reserve",       &Vector::reserve,       "reserves storage");
+    cl.def("capacity",      &Vector::capacity,      "returns the number of elements that can be held in currently allocated storage");
+    cl.def("shrink_to_fit", &Vector::shrink_to_fit, "reduces memory usage by freeing unused memory");
+
+    cl.def("clear", &Vector::clear, "clears the contents");
+    cl.def("swap",   &Vector::swap, "swaps the contents");
+
+    cl.def("front", [](Vector &v) {
+        if (v.size()) return v.front();
+        else throw index_error();
+    }, "access the first element");
+
+    cl.def("back", [](Vector &v) {
+        if (v.size()) return v.back();
+        else throw index_error();
+    }, "access the last element ");
+
+#endif
+
+    return cl;
+}
+
+
+
+//
+// std::map, std::unordered_map
+//
+
+NAMESPACE_BEGIN(detail)
+
+/* Fallback functions */
+template <typename, typename, typename... Args> void map_if_insertion_operator(const Args &...) { }
+template <typename, typename, typename... Args> void map_assignment(const Args &...) { }
+
+// Map assignment when copy-assignable: just copy the value
+template <typename Map, typename Class_>
+void map_assignment(enable_if_t<is_copy_assignable<typename Map::mapped_type>::value, Class_> &cl) {
+    using KeyType = typename Map::key_type;
+    using MappedType = typename Map::mapped_type;
+
+    cl.def("__setitem__",
+           [](Map &m, const KeyType &k, const MappedType &v) {
+               auto it = m.find(k);
+               if (it != m.end()) it->second = v;
+               else m.emplace(k, v);
+           }
+    );
+}
+
+// Not copy-assignable, but still copy-constructible: we can update the value by erasing and reinserting
+template<typename Map, typename Class_>
+void map_assignment(enable_if_t<
+        !is_copy_assignable<typename Map::mapped_type>::value &&
+        is_copy_constructible<typename Map::mapped_type>::value,
+        Class_> &cl) {
+    using KeyType = typename Map::key_type;
+    using MappedType = typename Map::mapped_type;
+
+    cl.def("__setitem__",
+           [](Map &m, const KeyType &k, const MappedType &v) {
+               // We can't use m[k] = v; because value type might not be default constructable
+               auto r = m.emplace(k, v);
+               if (!r.second) {
+                   // value type is not copy assignable so the only way to insert it is to erase it first...
+                   m.erase(r.first);
+                   m.emplace(k, v);
+               }
+           }
+    );
+}
+
+
+template <typename Map, typename Class_> auto map_if_insertion_operator(Class_ &cl, std::string const &name)
+-> decltype(std::declval<std::ostream&>() << std::declval<typename Map::key_type>() << std::declval<typename Map::mapped_type>(), void()) {
+
+    cl.def("__repr__",
+           [name](Map &m) {
+            std::ostringstream s;
+            s << name << '{';
+            bool f = false;
+            for (auto const &kv : m) {
+                if (f)
+                    s << ", ";
+                s << kv.first << ": " << kv.second;
+                f = true;
+            }
+            s << '}';
+            return s.str();
+        },
+        "Return the canonical string representation of this map."
+    );
+}
+
+
+NAMESPACE_END(detail)
+
+template <typename Map, typename holder_type = std::unique_ptr<Map>, typename... Args>
+class_<Map, holder_type> bind_map(handle scope, const std::string &name, Args&&... args) {
+    using KeyType = typename Map::key_type;
+    using MappedType = typename Map::mapped_type;
+    using Class_ = class_<Map, holder_type>;
+
+    // If either type is a non-module-local bound type then make the map binding non-local as well;
+    // otherwise (e.g. both types are either module-local or converting) the map will be
+    // module-local.
+    auto tinfo = detail::get_type_info(typeid(MappedType));
+    bool local = !tinfo || tinfo->module_local;
+    if (local) {
+        tinfo = detail::get_type_info(typeid(KeyType));
+        local = !tinfo || tinfo->module_local;
+    }
+
+    Class_ cl(scope, name.c_str(), pybind11::module_local(local), std::forward<Args>(args)...);
+
+    cl.def(init<>());
+
+    // Register stream insertion operator (if possible)
+    detail::map_if_insertion_operator<Map, Class_>(cl, name);
+
+    cl.def("__bool__",
+        [](const Map &m) -> bool { return !m.empty(); },
+        "Check whether the map is nonempty"
+    );
+
+    cl.def("__iter__",
+           [](Map &m) { return make_key_iterator(m.begin(), m.end()); },
+           keep_alive<0, 1>() /* Essential: keep list alive while iterator exists */
+    );
+
+    cl.def("items",
+           [](Map &m) { return make_iterator(m.begin(), m.end()); },
+           keep_alive<0, 1>() /* Essential: keep list alive while iterator exists */
+    );
+
+    cl.def("__getitem__",
+        [](Map &m, const KeyType &k) -> MappedType & {
+            auto it = m.find(k);
+            if (it == m.end())
+              throw key_error();
+           return it->second;
+        },
+        return_value_policy::reference_internal // ref + keepalive
+    );
+
+    cl.def("__contains__",
+        [](Map &m, const KeyType &k) -> bool {
+            auto it = m.find(k);
+            if (it == m.end())
+              return false;
+           return true;
+        }
+    );
+
+    // Assignment provided only if the type is copyable
+    detail::map_assignment<Map, Class_>(cl);
+
+    cl.def("__delitem__",
+           [](Map &m, const KeyType &k) {
+               auto it = m.find(k);
+               if (it == m.end())
+                   throw key_error();
+               m.erase(it);
+           }
+    );
+
+    cl.def("__len__", &Map::size);
+
+    return cl;
+}
+
+NAMESPACE_END(PYBIND11_NAMESPACE)
diff --git a/3rdparty/pybind11/pybind11/__init__.py b/3rdparty/pybind11/pybind11/__init__.py
new file mode 100644
index 00000000..4b1de3ef
--- /dev/null
+++ b/3rdparty/pybind11/pybind11/__init__.py
@@ -0,0 +1,12 @@
+from ._version import version_info, __version__  # noqa: F401 imported but unused
+
+
+def get_include(user=False):
+    import os
+    d = os.path.dirname(__file__)
+    if os.path.exists(os.path.join(d, "include")):
+        # Package is installed
+        return os.path.join(d, "include")
+    else:
+        # Package is from a source directory
+        return os.path.join(os.path.dirname(d), "include")
diff --git a/3rdparty/pybind11/pybind11/__main__.py b/3rdparty/pybind11/pybind11/__main__.py
new file mode 100644
index 00000000..89b263a8
--- /dev/null
+++ b/3rdparty/pybind11/pybind11/__main__.py
@@ -0,0 +1,36 @@
+from __future__ import print_function
+
+import argparse
+import sys
+import sysconfig
+
+from . import get_include
+
+
+def print_includes():
+    dirs = [sysconfig.get_path('include'),
+            sysconfig.get_path('platinclude'),
+            get_include()]
+
+    # Make unique but preserve order
+    unique_dirs = []
+    for d in dirs:
+        if d not in unique_dirs:
+            unique_dirs.append(d)
+
+    print(' '.join('-I' + d for d in unique_dirs))
+
+
+def main():
+    parser = argparse.ArgumentParser(prog='python -m pybind11')
+    parser.add_argument('--includes', action='store_true',
+                        help='Include flags for both pybind11 and Python headers.')
+    args = parser.parse_args()
+    if not sys.argv[1:]:
+        parser.print_help()
+    if args.includes:
+        print_includes()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/3rdparty/pybind11/pybind11/_version.py b/3rdparty/pybind11/pybind11/_version.py
new file mode 100644
index 00000000..8d5aa5c7
--- /dev/null
+++ b/3rdparty/pybind11/pybind11/_version.py
@@ -0,0 +1,2 @@
+version_info = (2, 5, 0)
+__version__ = '.'.join(map(str, version_info))
diff --git a/3rdparty/pybind11/setup.cfg b/3rdparty/pybind11/setup.cfg
new file mode 100644
index 00000000..002f38d1
--- /dev/null
+++ b/3rdparty/pybind11/setup.cfg
@@ -0,0 +1,12 @@
+[bdist_wheel]
+universal=1
+
+[flake8]
+max-line-length = 99
+show_source = True
+exclude = .git, __pycache__, build, dist, docs, tools, venv
+ignore =
+    # required for pretty matrix formatting: multiple spaces after `,` and `[`
+    E201, E241, W504,
+    # camelcase 'cPickle' imported as lowercase 'pickle'
+    N813
diff --git a/3rdparty/pybind11/setup.py b/3rdparty/pybind11/setup.py
new file mode 100644
index 00000000..473ea1ee
--- /dev/null
+++ b/3rdparty/pybind11/setup.py
@@ -0,0 +1,122 @@
+#!/usr/bin/env python
+
+# Setup script for PyPI; use CMakeFile.txt to build extension modules
+
+from setuptools import setup
+from distutils.command.install_headers import install_headers
+from distutils.command.build_py import build_py
+from pybind11 import __version__
+import os
+
+package_data = [
+    'include/pybind11/detail/class.h',
+    'include/pybind11/detail/common.h',
+    'include/pybind11/detail/descr.h',
+    'include/pybind11/detail/init.h',
+    'include/pybind11/detail/internals.h',
+    'include/pybind11/detail/typeid.h',
+    'include/pybind11/attr.h',
+    'include/pybind11/buffer_info.h',
+    'include/pybind11/cast.h',
+    'include/pybind11/chrono.h',
+    'include/pybind11/common.h',
+    'include/pybind11/complex.h',
+    'include/pybind11/eigen.h',
+    'include/pybind11/embed.h',
+    'include/pybind11/eval.h',
+    'include/pybind11/functional.h',
+    'include/pybind11/iostream.h',
+    'include/pybind11/numpy.h',
+    'include/pybind11/operators.h',
+    'include/pybind11/options.h',
+    'include/pybind11/pybind11.h',
+    'include/pybind11/pytypes.h',
+    'include/pybind11/stl.h',
+    'include/pybind11/stl_bind.h',
+]
+
+# Prevent installation of pybind11 headers by setting
+# PYBIND11_USE_CMAKE.
+if os.environ.get('PYBIND11_USE_CMAKE'):
+    headers = []
+else:
+    headers = package_data
+
+
+class InstallHeaders(install_headers):
+    """Use custom header installer because the default one flattens subdirectories"""
+    def run(self):
+        if not self.distribution.headers:
+            return
+
+        for header in self.distribution.headers:
+            subdir = os.path.dirname(os.path.relpath(header, 'include/pybind11'))
+            install_dir = os.path.join(self.install_dir, subdir)
+            self.mkpath(install_dir)
+
+            (out, _) = self.copy_file(header, install_dir)
+            self.outfiles.append(out)
+
+
+# Install the headers inside the package as well
+class BuildPy(build_py):
+    def build_package_data(self):
+        build_py.build_package_data(self)
+        for header in package_data:
+            target = os.path.join(self.build_lib, 'pybind11', header)
+            self.mkpath(os.path.dirname(target))
+            self.copy_file(header, target, preserve_mode=False)
+
+
+setup(
+    name='pybind11',
+    version=__version__,
+    description='Seamless operability between C++11 and Python',
+    author='Wenzel Jakob',
+    author_email='wenzel.jakob@epfl.ch',
+    url='https://github.com/pybind/pybind11',
+    download_url='https://github.com/pybind/pybind11/tarball/v' + __version__,
+    packages=['pybind11'],
+    license='BSD',
+    headers=headers,
+    zip_safe=False,
+    cmdclass=dict(install_headers=InstallHeaders, build_py=BuildPy),
+    classifiers=[
+        'Development Status :: 5 - Production/Stable',
+        'Intended Audience :: Developers',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+        'Topic :: Utilities',
+        'Programming Language :: C++',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.2',
+        'Programming Language :: Python :: 3.3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'License :: OSI Approved :: BSD License'
+    ],
+    keywords='C++11, Python bindings',
+    long_description="""pybind11 is a lightweight header-only library that
+exposes C++ types in Python and vice versa, mainly to create Python bindings of
+existing C++ code. Its goals and syntax are similar to the excellent
+Boost.Python by David Abrahams: to minimize boilerplate code in traditional
+extension modules by inferring type information using compile-time
+introspection.
+
+The main issue with Boost.Python-and the reason for creating such a similar
+project-is Boost. Boost is an enormously large and complex suite of utility
+libraries that works with almost every C++ compiler in existence. This
+compatibility has its cost: arcane template tricks and workarounds are
+necessary to support the oldest and buggiest of compiler specimens. Now that
+C++11-compatible compilers are widely available, this heavy machinery has
+become an excessively large and unnecessary dependency.
+
+Think of this library as a tiny self-contained version of Boost.Python with
+everything stripped away that isn't relevant for binding generation. Without
+comments, the core header files only require ~4K lines of code and depend on
+Python (2.7 or 3.x, or PyPy2.7 >= 5.7) and the C++ standard library. This
+compact implementation was possible thanks to some of the new C++11 language
+features (specifically: tuples, lambda functions and variadic templates). Since
+its creation, this library has grown beyond Boost.Python in many ways, leading
+to dramatically simpler binding code in many common situations.""")
diff --git a/3rdparty/pybind11/tests/CMakeLists.txt b/3rdparty/pybind11/tests/CMakeLists.txt
new file mode 100644
index 00000000..765c47ad
--- /dev/null
+++ b/3rdparty/pybind11/tests/CMakeLists.txt
@@ -0,0 +1,259 @@
+# CMakeLists.txt -- Build system for the pybind11 test suite
+#
+# Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
+#
+# All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+cmake_minimum_required(VERSION 2.8.12)
+
+option(PYBIND11_WERROR  "Report all warnings as errors"  OFF)
+
+if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    # We're being loaded directly, i.e. not via add_subdirectory, so make this
+    # work as its own project and load the pybind11Config to get the tools we need
+    project(pybind11_tests CXX)
+
+    find_package(pybind11 REQUIRED CONFIG)
+endif()
+
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  message(STATUS "Setting tests build type to MinSizeRel as none was specified")
+  set(CMAKE_BUILD_TYPE MinSizeRel CACHE STRING "Choose the type of build." FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
+    "MinSizeRel" "RelWithDebInfo")
+endif()
+
+# Full set of test files (you can override these; see below)
+set(PYBIND11_TEST_FILES
+  test_async.cpp
+  test_buffers.cpp
+  test_builtin_casters.cpp
+  test_call_policies.cpp
+  test_callbacks.cpp
+  test_chrono.cpp
+  test_class.cpp
+  test_constants_and_functions.cpp
+  test_copy_move.cpp
+  test_docstring_options.cpp
+  test_eigen.cpp
+  test_enum.cpp
+  test_eval.cpp
+  test_exceptions.cpp
+  test_factory_constructors.cpp
+  test_gil_scoped.cpp
+  test_iostream.cpp
+  test_kwargs_and_defaults.cpp
+  test_local_bindings.cpp
+  test_methods_and_attributes.cpp
+  test_modules.cpp
+  test_multiple_inheritance.cpp
+  test_numpy_array.cpp
+  test_numpy_dtypes.cpp
+  test_numpy_vectorize.cpp
+  test_opaque_types.cpp
+  test_operator_overloading.cpp
+  test_pickling.cpp
+  test_pytypes.cpp
+  test_sequences_and_iterators.cpp
+  test_smart_ptr.cpp
+  test_stl.cpp
+  test_stl_binders.cpp
+  test_tagbased_polymorphic.cpp
+  test_union.cpp
+  test_virtual_functions.cpp
+)
+
+# Invoking cmake with something like:
+#     cmake -DPYBIND11_TEST_OVERRIDE="test_callbacks.cpp;test_picking.cpp" ..
+# lets you override the tests that get compiled and run.  You can restore to all tests with:
+#     cmake -DPYBIND11_TEST_OVERRIDE= ..
+if (PYBIND11_TEST_OVERRIDE)
+  set(PYBIND11_TEST_FILES ${PYBIND11_TEST_OVERRIDE})
+endif()
+
+# Skip test_async for Python < 3.5
+list(FIND PYBIND11_TEST_FILES test_async.cpp PYBIND11_TEST_FILES_ASYNC_I)
+if((PYBIND11_TEST_FILES_ASYNC_I GREATER -1) AND ("${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}" VERSION_LESS 3.5))
+  message(STATUS "Skipping test_async because Python version ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR} < 3.5")
+  list(REMOVE_AT PYBIND11_TEST_FILES ${PYBIND11_TEST_FILES_ASYNC_I})
+endif()
+
+string(REPLACE ".cpp" ".py" PYBIND11_PYTEST_FILES "${PYBIND11_TEST_FILES}")
+
+# Contains the set of test files that require pybind11_cross_module_tests to be
+# built; if none of these are built (i.e. because TEST_OVERRIDE is used and
+# doesn't include them) the second module doesn't get built.
+set(PYBIND11_CROSS_MODULE_TESTS
+  test_exceptions.py
+  test_local_bindings.py
+  test_stl.py
+  test_stl_binders.py
+)
+
+set(PYBIND11_CROSS_MODULE_GIL_TESTS
+  test_gil_scoped.py
+)
+
+# Check if Eigen is available; if not, remove from PYBIND11_TEST_FILES (but
+# keep it in PYBIND11_PYTEST_FILES, so that we get the "eigen is not installed"
+# skip message).
+list(FIND PYBIND11_TEST_FILES test_eigen.cpp PYBIND11_TEST_FILES_EIGEN_I)
+if(PYBIND11_TEST_FILES_EIGEN_I GREATER -1)
+  # Try loading via newer Eigen's Eigen3Config first (bypassing tools/FindEigen3.cmake).
+  # Eigen 3.3.1+ exports a cmake 3.0+ target for handling dependency requirements, but also
+  # produces a fatal error if loaded from a pre-3.0 cmake.
+  if (NOT CMAKE_VERSION VERSION_LESS 3.0)
+    find_package(Eigen3 3.2.7 QUIET CONFIG)
+    if (EIGEN3_FOUND)
+      if (EIGEN3_VERSION_STRING AND NOT EIGEN3_VERSION_STRING VERSION_LESS 3.3.1)
+        set(PYBIND11_EIGEN_VIA_TARGET 1)
+      endif()
+    endif()
+  endif()
+  if (NOT EIGEN3_FOUND)
+    # Couldn't load via target, so fall back to allowing module mode finding, which will pick up
+    # tools/FindEigen3.cmake
+    find_package(Eigen3 3.2.7 QUIET)
+  endif()
+
+  if(EIGEN3_FOUND)
+    # Eigen 3.3.1+ cmake sets EIGEN3_VERSION_STRING (and hard codes the version when installed
+    # rather than looking it up in the cmake script); older versions, and the
+    # tools/FindEigen3.cmake, set EIGEN3_VERSION instead.
+    if(NOT EIGEN3_VERSION AND EIGEN3_VERSION_STRING)
+      set(EIGEN3_VERSION ${EIGEN3_VERSION_STRING})
+    endif()
+    message(STATUS "Building tests with Eigen v${EIGEN3_VERSION}")
+  else()
+    list(REMOVE_AT PYBIND11_TEST_FILES ${PYBIND11_TEST_FILES_EIGEN_I})
+    message(STATUS "Building tests WITHOUT Eigen")
+  endif()
+endif()
+
+# Optional dependency for some tests (boost::variant is only supported with version >= 1.56)
+find_package(Boost 1.56)
+
+# Compile with compiler warnings turned on
+function(pybind11_enable_warnings target_name)
+  if(MSVC)
+    target_compile_options(${target_name} PRIVATE /W4)
+  elseif(CMAKE_CXX_COMPILER_ID MATCHES "(GNU|Intel|Clang)")
+      target_compile_options(${target_name} PRIVATE -Wall -Wextra -Wconversion -Wcast-qual -Wdeprecated)
+  endif()
+
+  if(PYBIND11_WERROR)
+    if(MSVC)
+      target_compile_options(${target_name} PRIVATE /WX)
+    elseif(CMAKE_CXX_COMPILER_ID MATCHES "(GNU|Intel|Clang)")
+      target_compile_options(${target_name} PRIVATE -Werror)
+    endif()
+  endif()
+endfunction()
+
+set(test_targets pybind11_tests)
+
+# Build pybind11_cross_module_tests if any test_whatever.py are being built that require it
+foreach(t ${PYBIND11_CROSS_MODULE_TESTS})
+  list(FIND PYBIND11_PYTEST_FILES ${t} i)
+  if (i GREATER -1)
+    list(APPEND test_targets pybind11_cross_module_tests)
+    break()
+  endif()
+endforeach()
+
+foreach(t ${PYBIND11_CROSS_MODULE_GIL_TESTS})
+  list(FIND PYBIND11_PYTEST_FILES ${t} i)
+  if (i GREATER -1)
+    list(APPEND test_targets cross_module_gil_utils)
+    break()
+  endif()
+endforeach()
+
+set(testdir ${CMAKE_CURRENT_SOURCE_DIR})
+foreach(target ${test_targets})
+  set(test_files ${PYBIND11_TEST_FILES})
+  if(NOT target STREQUAL "pybind11_tests")
+    set(test_files "")
+  endif()
+
+  # Create the binding library
+  pybind11_add_module(${target} THIN_LTO ${target}.cpp ${test_files} ${PYBIND11_HEADERS})
+  pybind11_enable_warnings(${target})
+
+  if(MSVC)
+    target_compile_options(${target} PRIVATE /utf-8)
+  endif()
+
+  if(EIGEN3_FOUND)
+    if (PYBIND11_EIGEN_VIA_TARGET)
+      target_link_libraries(${target} PRIVATE Eigen3::Eigen)
+    else()
+      target_include_directories(${target} PRIVATE ${EIGEN3_INCLUDE_DIR})
+    endif()
+    target_compile_definitions(${target} PRIVATE -DPYBIND11_TEST_EIGEN)
+  endif()
+
+  if(Boost_FOUND)
+    target_include_directories(${target} PRIVATE ${Boost_INCLUDE_DIRS})
+    target_compile_definitions(${target} PRIVATE -DPYBIND11_TEST_BOOST)
+  endif()
+
+  # Always write the output file directly into the 'tests' directory (even on MSVC)
+  if(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
+    set_target_properties(${target} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${testdir})
+    foreach(config ${CMAKE_CONFIGURATION_TYPES})
+      string(TOUPPER ${config} config)
+      set_target_properties(${target} PROPERTIES LIBRARY_OUTPUT_DIRECTORY_${config} ${testdir})
+    endforeach()
+  endif()
+endforeach()
+
+# Make sure pytest is found or produce a fatal error
+if(NOT PYBIND11_PYTEST_FOUND)
+  execute_process(COMMAND ${PYTHON_EXECUTABLE} -c "import pytest; print(pytest.__version__)"
+                  RESULT_VARIABLE pytest_not_found OUTPUT_VARIABLE pytest_version ERROR_QUIET)
+  if(pytest_not_found)
+    message(FATAL_ERROR "Running the tests requires pytest. Please install it manually"
+                        " (try: ${PYTHON_EXECUTABLE} -m pip install pytest)")
+  elseif(pytest_version VERSION_LESS 3.0)
+    message(FATAL_ERROR "Running the tests requires pytest >= 3.0. Found: ${pytest_version}"
+                        "Please update it (try: ${PYTHON_EXECUTABLE} -m pip install -U pytest)")
+  endif()
+  set(PYBIND11_PYTEST_FOUND TRUE CACHE INTERNAL "")
+endif()
+
+if(CMAKE_VERSION VERSION_LESS 3.2)
+  set(PYBIND11_USES_TERMINAL "")
+else()
+  set(PYBIND11_USES_TERMINAL "USES_TERMINAL")
+endif()
+
+# A single command to compile and run the tests
+add_custom_target(pytest COMMAND ${PYTHON_EXECUTABLE} -m pytest ${PYBIND11_PYTEST_FILES}
+                  DEPENDS ${test_targets} WORKING_DIRECTORY ${testdir} ${PYBIND11_USES_TERMINAL})
+
+if(PYBIND11_TEST_OVERRIDE)
+  add_custom_command(TARGET pytest POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E echo "Note: not all tests run: -DPYBIND11_TEST_OVERRIDE is in effect")
+endif()
+
+# Add a check target to run all the tests, starting with pytest (we add dependencies to this below)
+add_custom_target(check DEPENDS pytest)
+
+# The remaining tests only apply when being built as part of the pybind11 project, but not if the
+# tests are being built independently.
+if (NOT PROJECT_NAME STREQUAL "pybind11")
+  return()
+endif()
+
+# Add a post-build comment to show the primary test suite .so size and, if a previous size, compare it:
+add_custom_command(TARGET pybind11_tests POST_BUILD
+  COMMAND ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/tools/libsize.py
+  $<TARGET_FILE:pybind11_tests> ${CMAKE_CURRENT_BINARY_DIR}/sosize-$<TARGET_FILE_NAME:pybind11_tests>.txt)
+
+# Test embedding the interpreter. Provides the `cpptest` target.
+add_subdirectory(test_embed)
+
+# Test CMake build using functions and targets from subdirectory or installed location
+add_subdirectory(test_cmake_build)
diff --git a/3rdparty/pybind11/tests/conftest.py b/3rdparty/pybind11/tests/conftest.py
new file mode 100644
index 00000000..57f681c6
--- /dev/null
+++ b/3rdparty/pybind11/tests/conftest.py
@@ -0,0 +1,244 @@
+"""pytest configuration
+
+Extends output capture as needed by pybind11: ignore constructors, optional unordered lines.
+Adds docstring and exceptions message sanitizers: ignore Python 2 vs 3 differences.
+"""
+
+import pytest
+import textwrap
+import difflib
+import re
+import sys
+import contextlib
+import platform
+import gc
+
+_unicode_marker = re.compile(r'u(\'[^\']*\')')
+_long_marker = re.compile(r'([0-9])L')
+_hexadecimal = re.compile(r'0x[0-9a-fA-F]+')
+
+# test_async.py requires support for async and await
+collect_ignore = []
+if sys.version_info[:2] < (3, 5):
+    collect_ignore.append("test_async.py")
+
+
+def _strip_and_dedent(s):
+    """For triple-quote strings"""
+    return textwrap.dedent(s.lstrip('\n').rstrip())
+
+
+def _split_and_sort(s):
+    """For output which does not require specific line order"""
+    return sorted(_strip_and_dedent(s).splitlines())
+
+
+def _make_explanation(a, b):
+    """Explanation for a failed assert -- the a and b arguments are List[str]"""
+    return ["--- actual / +++ expected"] + [line.strip('\n') for line in difflib.ndiff(a, b)]
+
+
+class Output(object):
+    """Basic output post-processing and comparison"""
+    def __init__(self, string):
+        self.string = string
+        self.explanation = []
+
+    def __str__(self):
+        return self.string
+
+    def __eq__(self, other):
+        # Ignore constructor/destructor output which is prefixed with "###"
+        a = [line for line in self.string.strip().splitlines() if not line.startswith("###")]
+        b = _strip_and_dedent(other).splitlines()
+        if a == b:
+            return True
+        else:
+            self.explanation = _make_explanation(a, b)
+            return False
+
+
+class Unordered(Output):
+    """Custom comparison for output without strict line ordering"""
+    def __eq__(self, other):
+        a = _split_and_sort(self.string)
+        b = _split_and_sort(other)
+        if a == b:
+            return True
+        else:
+            self.explanation = _make_explanation(a, b)
+            return False
+
+
+class Capture(object):
+    def __init__(self, capfd):
+        self.capfd = capfd
+        self.out = ""
+        self.err = ""
+
+    def __enter__(self):
+        self.capfd.readouterr()
+        return self
+
+    def __exit__(self, *args):
+        self.out, self.err = self.capfd.readouterr()
+
+    def __eq__(self, other):
+        a = Output(self.out)
+        b = other
+        if a == b:
+            return True
+        else:
+            self.explanation = a.explanation
+            return False
+
+    def __str__(self):
+        return self.out
+
+    def __contains__(self, item):
+        return item in self.out
+
+    @property
+    def unordered(self):
+        return Unordered(self.out)
+
+    @property
+    def stderr(self):
+        return Output(self.err)
+
+
+@pytest.fixture
+def capture(capsys):
+    """Extended `capsys` with context manager and custom equality operators"""
+    return Capture(capsys)
+
+
+class SanitizedString(object):
+    def __init__(self, sanitizer):
+        self.sanitizer = sanitizer
+        self.string = ""
+        self.explanation = []
+
+    def __call__(self, thing):
+        self.string = self.sanitizer(thing)
+        return self
+
+    def __eq__(self, other):
+        a = self.string
+        b = _strip_and_dedent(other)
+        if a == b:
+            return True
+        else:
+            self.explanation = _make_explanation(a.splitlines(), b.splitlines())
+            return False
+
+
+def _sanitize_general(s):
+    s = s.strip()
+    s = s.replace("pybind11_tests.", "m.")
+    s = s.replace("unicode", "str")
+    s = _long_marker.sub(r"\1", s)
+    s = _unicode_marker.sub(r"\1", s)
+    return s
+
+
+def _sanitize_docstring(thing):
+    s = thing.__doc__
+    s = _sanitize_general(s)
+    return s
+
+
+@pytest.fixture
+def doc():
+    """Sanitize docstrings and add custom failure explanation"""
+    return SanitizedString(_sanitize_docstring)
+
+
+def _sanitize_message(thing):
+    s = str(thing)
+    s = _sanitize_general(s)
+    s = _hexadecimal.sub("0", s)
+    return s
+
+
+@pytest.fixture
+def msg():
+    """Sanitize messages and add custom failure explanation"""
+    return SanitizedString(_sanitize_message)
+
+
+# noinspection PyUnusedLocal
+def pytest_assertrepr_compare(op, left, right):
+    """Hook to insert custom failure explanation"""
+    if hasattr(left, 'explanation'):
+        return left.explanation
+
+
+@contextlib.contextmanager
+def suppress(exception):
+    """Suppress the desired exception"""
+    try:
+        yield
+    except exception:
+        pass
+
+
+def gc_collect():
+    ''' Run the garbage collector twice (needed when running
+    reference counting tests with PyPy) '''
+    gc.collect()
+    gc.collect()
+
+
+def pytest_configure():
+    """Add import suppression and test requirements to `pytest` namespace"""
+    try:
+        import numpy as np
+    except ImportError:
+        np = None
+    try:
+        import scipy
+    except ImportError:
+        scipy = None
+    try:
+        from pybind11_tests.eigen import have_eigen
+    except ImportError:
+        have_eigen = False
+    pypy = platform.python_implementation() == "PyPy"
+
+    skipif = pytest.mark.skipif
+    pytest.suppress = suppress
+    pytest.requires_numpy = skipif(not np, reason="numpy is not installed")
+    pytest.requires_scipy = skipif(not np, reason="scipy is not installed")
+    pytest.requires_eigen_and_numpy = skipif(not have_eigen or not np,
+                                             reason="eigen and/or numpy are not installed")
+    pytest.requires_eigen_and_scipy = skipif(
+        not have_eigen or not scipy, reason="eigen and/or scipy are not installed")
+    pytest.unsupported_on_pypy = skipif(pypy, reason="unsupported on PyPy")
+    pytest.unsupported_on_py2 = skipif(sys.version_info.major < 3,
+                                       reason="unsupported on Python 2.x")
+    pytest.gc_collect = gc_collect
+
+
+def _test_import_pybind11():
+    """Early diagnostic for test module initialization errors
+
+    When there is an error during initialization, the first import will report the
+    real error while all subsequent imports will report nonsense. This import test
+    is done early (in the pytest configuration file, before any tests) in order to
+    avoid the noise of having all tests fail with identical error messages.
+
+    Any possible exception is caught here and reported manually *without* the stack
+    trace. This further reduces noise since the trace would only show pytest internals
+    which are not useful for debugging pybind11 module issues.
+    """
+    # noinspection PyBroadException
+    try:
+        import pybind11_tests  # noqa: F401 imported but unused
+    except Exception as e:
+        print("Failed to import pybind11_tests from pytest:")
+        print("  {}: {}".format(type(e).__name__, e))
+        sys.exit(1)
+
+
+_test_import_pybind11()
diff --git a/3rdparty/pybind11/tests/constructor_stats.h b/3rdparty/pybind11/tests/constructor_stats.h
new file mode 100644
index 00000000..431e5ace
--- /dev/null
+++ b/3rdparty/pybind11/tests/constructor_stats.h
@@ -0,0 +1,276 @@
+#pragma once
+/*
+    tests/constructor_stats.h -- framework for printing and tracking object
+    instance lifetimes in example/test code.
+
+    Copyright (c) 2016 Jason Rhinelander <jason@imaginary.ca>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+
+This header provides a few useful tools for writing examples or tests that want to check and/or
+display object instance lifetimes.  It requires that you include this header and add the following
+function calls to constructors:
+
+    class MyClass {
+        MyClass() { ...; print_default_created(this); }
+        ~MyClass() { ...; print_destroyed(this); }
+        MyClass(const MyClass &c) { ...; print_copy_created(this); }
+        MyClass(MyClass &&c) { ...; print_move_created(this); }
+        MyClass(int a, int b) { ...; print_created(this, a, b); }
+        MyClass &operator=(const MyClass &c) { ...; print_copy_assigned(this); }
+        MyClass &operator=(MyClass &&c) { ...; print_move_assigned(this); }
+
+        ...
+    }
+
+You can find various examples of these in several of the existing testing .cpp files.  (Of course
+you don't need to add any of the above constructors/operators that you don't actually have, except
+for the destructor).
+
+Each of these will print an appropriate message such as:
+
+    ### MyClass @ 0x2801910 created via default constructor
+    ### MyClass @ 0x27fa780 created 100 200
+    ### MyClass @ 0x2801910 destroyed
+    ### MyClass @ 0x27fa780 destroyed
+
+You can also include extra arguments (such as the 100, 200 in the output above, coming from the
+value constructor) for all of the above methods which will be included in the output.
+
+For testing, each of these also keeps track the created instances and allows you to check how many
+of the various constructors have been invoked from the Python side via code such as:
+
+    from pybind11_tests import ConstructorStats
+    cstats = ConstructorStats.get(MyClass)
+    print(cstats.alive())
+    print(cstats.default_constructions)
+
+Note that `.alive()` should usually be the first thing you call as it invokes Python's garbage
+collector to actually destroy objects that aren't yet referenced.
+
+For everything except copy and move constructors and destructors, any extra values given to the
+print_...() function is stored in a class-specific values list which you can retrieve and inspect
+from the ConstructorStats instance `.values()` method.
+
+In some cases, when you need to track instances of a C++ class not registered with pybind11, you
+need to add a function returning the ConstructorStats for the C++ class; this can be done with:
+
+    m.def("get_special_cstats", &ConstructorStats::get<SpecialClass>, py::return_value_policy::reference)
+
+Finally, you can suppress the output messages, but keep the constructor tracking (for
+inspection/testing in python) by using the functions with `print_` replaced with `track_` (e.g.
+`track_copy_created(this)`).
+
+*/
+
+#include "pybind11_tests.h"
+#include <unordered_map>
+#include <list>
+#include <typeindex>
+#include <sstream>
+
+class ConstructorStats {
+protected:
+    std::unordered_map<void*, int> _instances; // Need a map rather than set because members can shared address with parents
+    std::list<std::string> _values; // Used to track values (e.g. of value constructors)
+public:
+    int default_constructions = 0;
+    int copy_constructions = 0;
+    int move_constructions = 0;
+    int copy_assignments = 0;
+    int move_assignments = 0;
+
+    void copy_created(void *inst) {
+        created(inst);
+        copy_constructions++;
+    }
+
+    void move_created(void *inst) {
+        created(inst);
+        move_constructions++;
+    }
+
+    void default_created(void *inst) {
+        created(inst);
+        default_constructions++;
+    }
+
+    void created(void *inst) {
+        ++_instances[inst];
+    }
+
+    void destroyed(void *inst) {
+        if (--_instances[inst] < 0)
+            throw std::runtime_error("cstats.destroyed() called with unknown "
+                                     "instance; potential double-destruction "
+                                     "or a missing cstats.created()");
+    }
+
+    static void gc() {
+        // Force garbage collection to ensure any pending destructors are invoked:
+#if defined(PYPY_VERSION)
+        PyObject *globals = PyEval_GetGlobals();
+        PyObject *result = PyRun_String(
+            "import gc\n"
+            "for i in range(2):"
+            "    gc.collect()\n",
+            Py_file_input, globals, globals);
+        if (result == nullptr)
+            throw py::error_already_set();
+        Py_DECREF(result);
+#else
+        py::module::import("gc").attr("collect")();
+#endif
+    }
+
+    int alive() {
+        gc();
+        int total = 0;
+        for (const auto &p : _instances)
+            if (p.second > 0)
+                total += p.second;
+        return total;
+    }
+
+    void value() {} // Recursion terminator
+    // Takes one or more values, converts them to strings, then stores them.
+    template <typename T, typename... Tmore> void value(const T &v, Tmore &&...args) {
+        std::ostringstream oss;
+        oss << v;
+        _values.push_back(oss.str());
+        value(std::forward<Tmore>(args)...);
+    }
+
+    // Move out stored values
+    py::list values() {
+        py::list l;
+        for (const auto &v : _values) l.append(py::cast(v));
+        _values.clear();
+        return l;
+    }
+
+    // Gets constructor stats from a C++ type index
+    static ConstructorStats& get(std::type_index type) {
+        static std::unordered_map<std::type_index, ConstructorStats> all_cstats;
+        return all_cstats[type];
+    }
+
+    // Gets constructor stats from a C++ type
+    template <typename T> static ConstructorStats& get() {
+#if defined(PYPY_VERSION)
+        gc();
+#endif
+        return get(typeid(T));
+    }
+
+    // Gets constructor stats from a Python class
+    static ConstructorStats& get(py::object class_) {
+        auto &internals = py::detail::get_internals();
+        const std::type_index *t1 = nullptr, *t2 = nullptr;
+        try {
+            auto *type_info = internals.registered_types_py.at((PyTypeObject *) class_.ptr()).at(0);
+            for (auto &p : internals.registered_types_cpp) {
+                if (p.second == type_info) {
+                    if (t1) {
+                        t2 = &p.first;
+                        break;
+                    }
+                    t1 = &p.first;
+                }
+            }
+        }
+        catch (const std::out_of_range&) {}
+        if (!t1) throw std::runtime_error("Unknown class passed to ConstructorStats::get()");
+        auto &cs1 = get(*t1);
+        // If we have both a t1 and t2 match, one is probably the trampoline class; return whichever
+        // has more constructions (typically one or the other will be 0)
+        if (t2) {
+            auto &cs2 = get(*t2);
+            int cs1_total = cs1.default_constructions + cs1.copy_constructions + cs1.move_constructions + (int) cs1._values.size();
+            int cs2_total = cs2.default_constructions + cs2.copy_constructions + cs2.move_constructions + (int) cs2._values.size();
+            if (cs2_total > cs1_total) return cs2;
+        }
+        return cs1;
+    }
+};
+
+// To track construction/destruction, you need to call these methods from the various
+// constructors/operators.  The ones that take extra values record the given values in the
+// constructor stats values for later inspection.
+template <class T> void track_copy_created(T *inst) { ConstructorStats::get<T>().copy_created(inst); }
+template <class T> void track_move_created(T *inst) { ConstructorStats::get<T>().move_created(inst); }
+template <class T, typename... Values> void track_copy_assigned(T *, Values &&...values) {
+    auto &cst = ConstructorStats::get<T>();
+    cst.copy_assignments++;
+    cst.value(std::forward<Values>(values)...);
+}
+template <class T, typename... Values> void track_move_assigned(T *, Values &&...values) {
+    auto &cst = ConstructorStats::get<T>();
+    cst.move_assignments++;
+    cst.value(std::forward<Values>(values)...);
+}
+template <class T, typename... Values> void track_default_created(T *inst, Values &&...values) {
+    auto &cst = ConstructorStats::get<T>();
+    cst.default_created(inst);
+    cst.value(std::forward<Values>(values)...);
+}
+template <class T, typename... Values> void track_created(T *inst, Values &&...values) {
+    auto &cst = ConstructorStats::get<T>();
+    cst.created(inst);
+    cst.value(std::forward<Values>(values)...);
+}
+template <class T, typename... Values> void track_destroyed(T *inst) {
+    ConstructorStats::get<T>().destroyed(inst);
+}
+template <class T, typename... Values> void track_values(T *, Values &&...values) {
+    ConstructorStats::get<T>().value(std::forward<Values>(values)...);
+}
+
+/// Don't cast pointers to Python, print them as strings
+inline const char *format_ptrs(const char *p) { return p; }
+template <typename T>
+py::str format_ptrs(T *p) { return "{:#x}"_s.format(reinterpret_cast<std::uintptr_t>(p)); }
+template <typename T>
+auto format_ptrs(T &&x) -> decltype(std::forward<T>(x)) { return std::forward<T>(x); }
+
+template <class T, typename... Output>
+void print_constr_details(T *inst, const std::string &action, Output &&...output) {
+    py::print("###", py::type_id<T>(), "@", format_ptrs(inst), action,
+              format_ptrs(std::forward<Output>(output))...);
+}
+
+// Verbose versions of the above:
+template <class T, typename... Values> void print_copy_created(T *inst, Values &&...values) { // NB: this prints, but doesn't store, given values
+    print_constr_details(inst, "created via copy constructor", values...);
+    track_copy_created(inst);
+}
+template <class T, typename... Values> void print_move_created(T *inst, Values &&...values) { // NB: this prints, but doesn't store, given values
+    print_constr_details(inst, "created via move constructor", values...);
+    track_move_created(inst);
+}
+template <class T, typename... Values> void print_copy_assigned(T *inst, Values &&...values) {
+    print_constr_details(inst, "assigned via copy assignment", values...);
+    track_copy_assigned(inst, values...);
+}
+template <class T, typename... Values> void print_move_assigned(T *inst, Values &&...values) {
+    print_constr_details(inst, "assigned via move assignment", values...);
+    track_move_assigned(inst, values...);
+}
+template <class T, typename... Values> void print_default_created(T *inst, Values &&...values) {
+    print_constr_details(inst, "created via default constructor", values...);
+    track_default_created(inst, values...);
+}
+template <class T, typename... Values> void print_created(T *inst, Values &&...values) {
+    print_constr_details(inst, "created", values...);
+    track_created(inst, values...);
+}
+template <class T, typename... Values> void print_destroyed(T *inst, Values &&...values) { // Prints but doesn't store given values
+    print_constr_details(inst, "destroyed", values...);
+    track_destroyed(inst);
+}
+template <class T, typename... Values> void print_values(T *inst, Values &&...values) {
+    print_constr_details(inst, ":", values...);
+    track_values(inst, values...);
+}
+
diff --git a/3rdparty/pybind11/tests/cross_module_gil_utils.cpp b/3rdparty/pybind11/tests/cross_module_gil_utils.cpp
new file mode 100644
index 00000000..07db9f6e
--- /dev/null
+++ b/3rdparty/pybind11/tests/cross_module_gil_utils.cpp
@@ -0,0 +1,73 @@
+/*
+    tests/cross_module_gil_utils.cpp -- tools for acquiring GIL from a different module
+
+    Copyright (c) 2019 Google LLC
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+#include <pybind11/pybind11.h>
+#include <cstdint>
+
+// This file mimics a DSO that makes pybind11 calls but does not define a
+// PYBIND11_MODULE. The purpose is to test that such a DSO can create a
+// py::gil_scoped_acquire when the running thread is in a GIL-released state.
+//
+// Note that we define a Python module here for convenience, but in general
+// this need not be the case. The typical scenario would be a DSO that implements
+// shared logic used internally by multiple pybind11 modules.
+
+namespace {
+
+namespace py = pybind11;
+void gil_acquire() { py::gil_scoped_acquire gil; }
+
+constexpr char kModuleName[] = "cross_module_gil_utils";
+
+#if PY_MAJOR_VERSION >= 3
+struct PyModuleDef moduledef = {
+    PyModuleDef_HEAD_INIT,
+    kModuleName,
+    NULL,
+    0,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+#else
+PyMethodDef module_methods[] = {
+    {NULL, NULL, 0, NULL}
+};
+#endif
+
+}  // namespace
+
+extern "C" PYBIND11_EXPORT
+#if PY_MAJOR_VERSION >= 3
+PyObject* PyInit_cross_module_gil_utils()
+#else
+void initcross_module_gil_utils()
+#endif
+{
+
+    PyObject* m =
+#if PY_MAJOR_VERSION >= 3
+        PyModule_Create(&moduledef);
+#else
+        Py_InitModule(kModuleName, module_methods);
+#endif
+
+    if (m != NULL) {
+        static_assert(
+            sizeof(&gil_acquire) == sizeof(void*),
+            "Function pointer must have the same size as void*");
+        PyModule_AddObject(m, "gil_acquire_funcaddr",
+                           PyLong_FromVoidPtr(reinterpret_cast<void*>(&gil_acquire)));
+    }
+
+#if PY_MAJOR_VERSION >= 3
+    return m;
+#endif
+}
diff --git a/3rdparty/pybind11/tests/local_bindings.h b/3rdparty/pybind11/tests/local_bindings.h
new file mode 100644
index 00000000..b6afb808
--- /dev/null
+++ b/3rdparty/pybind11/tests/local_bindings.h
@@ -0,0 +1,64 @@
+#pragma once
+#include "pybind11_tests.h"
+
+/// Simple class used to test py::local:
+template <int> class LocalBase {
+public:
+    LocalBase(int i) : i(i) { }
+    int i = -1;
+};
+
+/// Registered with py::module_local in both main and secondary modules:
+using LocalType = LocalBase<0>;
+/// Registered without py::module_local in both modules:
+using NonLocalType = LocalBase<1>;
+/// A second non-local type (for stl_bind tests):
+using NonLocal2 = LocalBase<2>;
+/// Tests within-module, different-compilation-unit local definition conflict:
+using LocalExternal = LocalBase<3>;
+/// Mixed: registered local first, then global
+using MixedLocalGlobal = LocalBase<4>;
+/// Mixed: global first, then local
+using MixedGlobalLocal = LocalBase<5>;
+
+/// Registered with py::module_local only in the secondary module:
+using ExternalType1 = LocalBase<6>;
+using ExternalType2 = LocalBase<7>;
+
+using LocalVec = std::vector<LocalType>;
+using LocalVec2 = std::vector<NonLocal2>;
+using LocalMap = std::unordered_map<std::string, LocalType>;
+using NonLocalVec = std::vector<NonLocalType>;
+using NonLocalVec2 = std::vector<NonLocal2>;
+using NonLocalMap = std::unordered_map<std::string, NonLocalType>;
+using NonLocalMap2 = std::unordered_map<std::string, uint8_t>;
+
+PYBIND11_MAKE_OPAQUE(LocalVec);
+PYBIND11_MAKE_OPAQUE(LocalVec2);
+PYBIND11_MAKE_OPAQUE(LocalMap);
+PYBIND11_MAKE_OPAQUE(NonLocalVec);
+//PYBIND11_MAKE_OPAQUE(NonLocalVec2); // same type as LocalVec2
+PYBIND11_MAKE_OPAQUE(NonLocalMap);
+PYBIND11_MAKE_OPAQUE(NonLocalMap2);
+
+
+// Simple bindings (used with the above):
+template <typename T, int Adjust = 0, typename... Args>
+py::class_<T> bind_local(Args && ...args) {
+    return py::class_<T>(std::forward<Args>(args)...)
+        .def(py::init<int>())
+        .def("get", [](T &i) { return i.i + Adjust; });
+};
+
+// Simulate a foreign library base class (to match the example in the docs):
+namespace pets {
+class Pet {
+public:
+    Pet(std::string name) : name_(name) {}
+    std::string name_;
+    const std::string &name() { return name_; }
+};
+}
+
+struct MixGL { int i; MixGL(int i) : i{i} {} };
+struct MixGL2 { int i; MixGL2(int i) : i{i} {} };
diff --git a/3rdparty/pybind11/tests/object.h b/3rdparty/pybind11/tests/object.h
new file mode 100644
index 00000000..9235f19c
--- /dev/null
+++ b/3rdparty/pybind11/tests/object.h
@@ -0,0 +1,175 @@
+#if !defined(__OBJECT_H)
+#define __OBJECT_H
+
+#include <atomic>
+#include "constructor_stats.h"
+
+/// Reference counted object base class
+class Object {
+public:
+    /// Default constructor
+    Object() { print_default_created(this); }
+
+    /// Copy constructor
+    Object(const Object &) : m_refCount(0) { print_copy_created(this); }
+
+    /// Return the current reference count
+    int getRefCount() const { return m_refCount; };
+
+    /// Increase the object's reference count by one
+    void incRef() const { ++m_refCount; }
+
+    /** \brief Decrease the reference count of
+     * the object and possibly deallocate it.
+     *
+     * The object will automatically be deallocated once
+     * the reference count reaches zero.
+     */
+    void decRef(bool dealloc = true) const {
+        --m_refCount;
+        if (m_refCount == 0 && dealloc)
+            delete this;
+        else if (m_refCount < 0)
+            throw std::runtime_error("Internal error: reference count < 0!");
+    }
+
+    virtual std::string toString() const = 0;
+protected:
+    /** \brief Virtual protected deconstructor.
+     * (Will only be called by \ref ref)
+     */
+    virtual ~Object() { print_destroyed(this); }
+private:
+    mutable std::atomic<int> m_refCount { 0 };
+};
+
+// Tag class used to track constructions of ref objects.  When we track constructors, below, we
+// track and print out the actual class (e.g. ref<MyObject>), and *also* add a fake tracker for
+// ref_tag.  This lets us check that the total number of ref<Anything> constructors/destructors is
+// correct without having to check each individual ref<Whatever> type individually.
+class ref_tag {};
+
+/**
+ * \brief Reference counting helper
+ *
+ * The \a ref refeference template is a simple wrapper to store a
+ * pointer to an object. It takes care of increasing and decreasing
+ * the reference count of the object. When the last reference goes
+ * out of scope, the associated object will be deallocated.
+ *
+ * \ingroup libcore
+ */
+template <typename T> class ref {
+public:
+    /// Create a nullptr reference
+    ref() : m_ptr(nullptr) { print_default_created(this); track_default_created((ref_tag*) this); }
+
+    /// Construct a reference from a pointer
+    ref(T *ptr) : m_ptr(ptr) {
+        if (m_ptr) ((Object *) m_ptr)->incRef();
+
+        print_created(this, "from pointer", m_ptr); track_created((ref_tag*) this, "from pointer");
+
+    }
+
+    /// Copy constructor
+    ref(const ref &r) : m_ptr(r.m_ptr) {
+        if (m_ptr)
+            ((Object *) m_ptr)->incRef();
+
+        print_copy_created(this, "with pointer", m_ptr); track_copy_created((ref_tag*) this);
+    }
+
+    /// Move constructor
+    ref(ref &&r) : m_ptr(r.m_ptr) {
+        r.m_ptr = nullptr;
+
+        print_move_created(this, "with pointer", m_ptr); track_move_created((ref_tag*) this);
+    }
+
+    /// Destroy this reference
+    ~ref() {
+        if (m_ptr)
+            ((Object *) m_ptr)->decRef();
+
+        print_destroyed(this); track_destroyed((ref_tag*) this);
+    }
+
+    /// Move another reference into the current one
+    ref& operator=(ref&& r) {
+        print_move_assigned(this, "pointer", r.m_ptr); track_move_assigned((ref_tag*) this);
+
+        if (*this == r)
+            return *this;
+        if (m_ptr)
+            ((Object *) m_ptr)->decRef();
+        m_ptr = r.m_ptr;
+        r.m_ptr = nullptr;
+        return *this;
+    }
+
+    /// Overwrite this reference with another reference
+    ref& operator=(const ref& r) {
+        print_copy_assigned(this, "pointer", r.m_ptr); track_copy_assigned((ref_tag*) this);
+
+        if (m_ptr == r.m_ptr)
+            return *this;
+        if (m_ptr)
+            ((Object *) m_ptr)->decRef();
+        m_ptr = r.m_ptr;
+        if (m_ptr)
+            ((Object *) m_ptr)->incRef();
+        return *this;
+    }
+
+    /// Overwrite this reference with a pointer to another object
+    ref& operator=(T *ptr) {
+        print_values(this, "assigned pointer"); track_values((ref_tag*) this, "assigned pointer");
+
+        if (m_ptr == ptr)
+            return *this;
+        if (m_ptr)
+            ((Object *) m_ptr)->decRef();
+        m_ptr = ptr;
+        if (m_ptr)
+            ((Object *) m_ptr)->incRef();
+        return *this;
+    }
+
+    /// Compare this reference with another reference
+    bool operator==(const ref &r) const { return m_ptr == r.m_ptr; }
+
+    /// Compare this reference with another reference
+    bool operator!=(const ref &r) const { return m_ptr != r.m_ptr; }
+
+    /// Compare this reference with a pointer
+    bool operator==(const T* ptr) const { return m_ptr == ptr; }
+
+    /// Compare this reference with a pointer
+    bool operator!=(const T* ptr) const { return m_ptr != ptr; }
+
+    /// Access the object referenced by this reference
+    T* operator->() { return m_ptr; }
+
+    /// Access the object referenced by this reference
+    const T* operator->() const { return m_ptr; }
+
+    /// Return a C++ reference to the referenced object
+    T& operator*() { return *m_ptr; }
+
+    /// Return a const C++ reference to the referenced object
+    const T& operator*() const { return *m_ptr; }
+
+    /// Return a pointer to the referenced object
+    operator T* () { return m_ptr; }
+
+    /// Return a const pointer to the referenced object
+    T* get_ptr() { return m_ptr; }
+
+    /// Return a pointer to the referenced object
+    const T* get_ptr() const { return m_ptr; }
+private:
+    T *m_ptr;
+};
+
+#endif /* __OBJECT_H */
diff --git a/3rdparty/pybind11/tests/pybind11_cross_module_tests.cpp b/3rdparty/pybind11/tests/pybind11_cross_module_tests.cpp
new file mode 100644
index 00000000..f705e310
--- /dev/null
+++ b/3rdparty/pybind11/tests/pybind11_cross_module_tests.cpp
@@ -0,0 +1,123 @@
+/*
+    tests/pybind11_cross_module_tests.cpp -- contains tests that require multiple modules
+
+    Copyright (c) 2017 Jason Rhinelander <jason@imaginary.ca>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "local_bindings.h"
+#include <pybind11/stl_bind.h>
+#include <numeric>
+
+PYBIND11_MODULE(pybind11_cross_module_tests, m) {
+    m.doc() = "pybind11 cross-module test module";
+
+    // test_local_bindings.py tests:
+    //
+    // Definitions here are tested by importing both this module and the
+    // relevant pybind11_tests submodule from a test_whatever.py
+
+    // test_load_external
+    bind_local<ExternalType1>(m, "ExternalType1", py::module_local());
+    bind_local<ExternalType2>(m, "ExternalType2", py::module_local());
+
+    // test_exceptions.py
+    m.def("raise_runtime_error", []() { PyErr_SetString(PyExc_RuntimeError, "My runtime error"); throw py::error_already_set(); });
+    m.def("raise_value_error", []() { PyErr_SetString(PyExc_ValueError, "My value error"); throw py::error_already_set(); });
+    m.def("throw_pybind_value_error", []() { throw py::value_error("pybind11 value error"); });
+    m.def("throw_pybind_type_error", []() { throw py::type_error("pybind11 type error"); });
+    m.def("throw_stop_iteration", []() { throw py::stop_iteration(); });
+
+    // test_local_bindings.py
+    // Local to both:
+    bind_local<LocalType, 1>(m, "LocalType", py::module_local())
+        .def("get2", [](LocalType &t) { return t.i + 2; })
+        ;
+
+    // Can only be called with our python type:
+    m.def("local_value", [](LocalType &l) { return l.i; });
+
+    // test_nonlocal_failure
+    // This registration will fail (global registration when LocalFail is already registered
+    // globally in the main test module):
+    m.def("register_nonlocal", [m]() {
+        bind_local<NonLocalType, 0>(m, "NonLocalType");
+    });
+
+    // test_stl_bind_local
+    // stl_bind.h binders defaults to py::module_local if the types are local or converting:
+    py::bind_vector<LocalVec>(m, "LocalVec");
+    py::bind_map<LocalMap>(m, "LocalMap");
+
+    // test_stl_bind_global
+    // and global if the type (or one of the types, for the map) is global (so these will fail,
+    // assuming pybind11_tests is already loaded):
+    m.def("register_nonlocal_vec", [m]() {
+        py::bind_vector<NonLocalVec>(m, "NonLocalVec");
+    });
+    m.def("register_nonlocal_map", [m]() {
+        py::bind_map<NonLocalMap>(m, "NonLocalMap");
+    });
+    // The default can, however, be overridden to global using `py::module_local()` or
+    // `py::module_local(false)`.
+    // Explicitly made local:
+    py::bind_vector<NonLocalVec2>(m, "NonLocalVec2", py::module_local());
+    // Explicitly made global (and so will fail to bind):
+    m.def("register_nonlocal_map2", [m]() {
+        py::bind_map<NonLocalMap2>(m, "NonLocalMap2", py::module_local(false));
+    });
+
+    // test_mixed_local_global
+    // We try this both with the global type registered first and vice versa (the order shouldn't
+    // matter).
+    m.def("register_mixed_global_local", [m]() {
+        bind_local<MixedGlobalLocal, 200>(m, "MixedGlobalLocal", py::module_local());
+    });
+    m.def("register_mixed_local_global", [m]() {
+        bind_local<MixedLocalGlobal, 2000>(m, "MixedLocalGlobal", py::module_local(false));
+    });
+    m.def("get_mixed_gl", [](int i) { return MixedGlobalLocal(i); });
+    m.def("get_mixed_lg", [](int i) { return MixedLocalGlobal(i); });
+
+    // test_internal_locals_differ
+    m.def("local_cpp_types_addr", []() { return (uintptr_t) &py::detail::registered_local_types_cpp(); });
+
+    // test_stl_caster_vs_stl_bind
+    py::bind_vector<std::vector<int>>(m, "VectorInt");
+
+    m.def("load_vector_via_binding", [](std::vector<int> &v) {
+        return std::accumulate(v.begin(), v.end(), 0);
+    });
+
+    // test_cross_module_calls
+    m.def("return_self", [](LocalVec *v) { return v; });
+    m.def("return_copy", [](const LocalVec &v) { return LocalVec(v); });
+
+    class Dog : public pets::Pet { public: Dog(std::string name) : Pet(name) {}; };
+    py::class_<pets::Pet>(m, "Pet", py::module_local())
+        .def("name", &pets::Pet::name);
+    // Binding for local extending class:
+    py::class_<Dog, pets::Pet>(m, "Dog")
+        .def(py::init<std::string>());
+    m.def("pet_name", [](pets::Pet &p) { return p.name(); });
+
+    py::class_<MixGL>(m, "MixGL", py::module_local()).def(py::init<int>());
+    m.def("get_gl_value", [](MixGL &o) { return o.i + 100; });
+
+    py::class_<MixGL2>(m, "MixGL2", py::module_local()).def(py::init<int>());
+
+    // test_vector_bool
+    // We can't test both stl.h and stl_bind.h conversions of `std::vector<bool>` within
+    // the same module (it would be an ODR violation). Therefore `bind_vector` of `bool`
+    // is defined here and tested in `test_stl_binders.py`.
+    py::bind_vector<std::vector<bool>>(m, "VectorBool");
+
+    // test_missing_header_message
+    // The main module already includes stl.h, but we need to test the error message
+    // which appears when this header is missing.
+    m.def("missing_header_arg", [](std::vector<float>) { });
+    m.def("missing_header_return", []() { return std::vector<float>(); });
+}
diff --git a/3rdparty/pybind11/tests/pybind11_tests.cpp b/3rdparty/pybind11/tests/pybind11_tests.cpp
new file mode 100644
index 00000000..bc7d2c3e
--- /dev/null
+++ b/3rdparty/pybind11/tests/pybind11_tests.cpp
@@ -0,0 +1,93 @@
+/*
+    tests/pybind11_tests.cpp -- pybind example plugin
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+
+#include <functional>
+#include <list>
+
+/*
+For testing purposes, we define a static global variable here in a function that each individual
+test .cpp calls with its initialization lambda.  It's convenient here because we can just not
+compile some test files to disable/ignore some of the test code.
+
+It is NOT recommended as a way to use pybind11 in practice, however: the initialization order will
+be essentially random, which is okay for our test scripts (there are no dependencies between the
+individual pybind11 test .cpp files), but most likely not what you want when using pybind11
+productively.
+
+Instead, see the "How can I reduce the build time?" question in the "Frequently asked questions"
+section of the documentation for good practice on splitting binding code over multiple files.
+*/
+std::list<std::function<void(py::module &)>> &initializers() {
+    static std::list<std::function<void(py::module &)>> inits;
+    return inits;
+}
+
+test_initializer::test_initializer(Initializer init) {
+    initializers().push_back(init);
+}
+
+test_initializer::test_initializer(const char *submodule_name, Initializer init) {
+    initializers().push_back([=](py::module &parent) {
+        auto m = parent.def_submodule(submodule_name);
+        init(m);
+    });
+}
+
+void bind_ConstructorStats(py::module &m) {
+    py::class_<ConstructorStats>(m, "ConstructorStats")
+        .def("alive", &ConstructorStats::alive)
+        .def("values", &ConstructorStats::values)
+        .def_readwrite("default_constructions", &ConstructorStats::default_constructions)
+        .def_readwrite("copy_assignments", &ConstructorStats::copy_assignments)
+        .def_readwrite("move_assignments", &ConstructorStats::move_assignments)
+        .def_readwrite("copy_constructions", &ConstructorStats::copy_constructions)
+        .def_readwrite("move_constructions", &ConstructorStats::move_constructions)
+        .def_static("get", (ConstructorStats &(*)(py::object)) &ConstructorStats::get, py::return_value_policy::reference_internal)
+
+        // Not exactly ConstructorStats, but related: expose the internal pybind number of registered instances
+        // to allow instance cleanup checks (invokes a GC first)
+        .def_static("detail_reg_inst", []() {
+            ConstructorStats::gc();
+            return py::detail::get_internals().registered_instances.size();
+        })
+        ;
+}
+
+PYBIND11_MODULE(pybind11_tests, m) {
+    m.doc() = "pybind11 test module";
+
+    bind_ConstructorStats(m);
+
+#if !defined(NDEBUG)
+    m.attr("debug_enabled") = true;
+#else
+    m.attr("debug_enabled") = false;
+#endif
+
+    py::class_<UserType>(m, "UserType", "A `py::class_` type for testing")
+        .def(py::init<>())
+        .def(py::init<int>())
+        .def("get_value", &UserType::value, "Get value using a method")
+        .def("set_value", &UserType::set, "Set value using a method")
+        .def_property("value", &UserType::value, &UserType::set, "Get/set value using a property")
+        .def("__repr__", [](const UserType& u) { return "UserType({})"_s.format(u.value()); });
+
+    py::class_<IncType, UserType>(m, "IncType")
+        .def(py::init<>())
+        .def(py::init<int>())
+        .def("__repr__", [](const IncType& u) { return "IncType({})"_s.format(u.value()); });
+
+    for (const auto &initializer : initializers())
+        initializer(m);
+
+    if (!py::hasattr(m, "have_eigen")) m.attr("have_eigen") = false;
+}
diff --git a/3rdparty/pybind11/tests/pybind11_tests.h b/3rdparty/pybind11/tests/pybind11_tests.h
new file mode 100644
index 00000000..90963a5d
--- /dev/null
+++ b/3rdparty/pybind11/tests/pybind11_tests.h
@@ -0,0 +1,65 @@
+#pragma once
+#include <pybind11/pybind11.h>
+
+#if defined(_MSC_VER) && _MSC_VER < 1910
+// We get some really long type names here which causes MSVC 2015 to emit warnings
+#  pragma warning(disable: 4503) // warning C4503: decorated name length exceeded, name was truncated
+#endif
+
+namespace py = pybind11;
+using namespace pybind11::literals;
+
+class test_initializer {
+    using Initializer = void (*)(py::module &);
+
+public:
+    test_initializer(Initializer init);
+    test_initializer(const char *submodule_name, Initializer init);
+};
+
+#define TEST_SUBMODULE(name, variable)                   \
+    void test_submodule_##name(py::module &);            \
+    test_initializer name(#name, test_submodule_##name); \
+    void test_submodule_##name(py::module &variable)
+
+
+/// Dummy type which is not exported anywhere -- something to trigger a conversion error
+struct UnregisteredType { };
+
+/// A user-defined type which is exported and can be used by any test
+class UserType {
+public:
+    UserType() = default;
+    UserType(int i) : i(i) { }
+
+    int value() const { return i; }
+    void set(int set) { i = set; }
+
+private:
+    int i = -1;
+};
+
+/// Like UserType, but increments `value` on copy for quick reference vs. copy tests
+class IncType : public UserType {
+public:
+    using UserType::UserType;
+    IncType() = default;
+    IncType(const IncType &other) : IncType(other.value() + 1) { }
+    IncType(IncType &&) = delete;
+    IncType &operator=(const IncType &) = delete;
+    IncType &operator=(IncType &&) = delete;
+};
+
+/// Custom cast-only type that casts to a string "rvalue" or "lvalue" depending on the cast context.
+/// Used to test recursive casters (e.g. std::tuple, stl containers).
+struct RValueCaster {};
+NAMESPACE_BEGIN(pybind11)
+NAMESPACE_BEGIN(detail)
+template<> class type_caster<RValueCaster> {
+public:
+    PYBIND11_TYPE_CASTER(RValueCaster, _("RValueCaster"));
+    static handle cast(RValueCaster &&, return_value_policy, handle) { return py::str("rvalue").release(); }
+    static handle cast(const RValueCaster &, return_value_policy, handle) { return py::str("lvalue").release(); }
+};
+NAMESPACE_END(detail)
+NAMESPACE_END(pybind11)
diff --git a/3rdparty/pybind11/tests/pytest.ini b/3rdparty/pybind11/tests/pytest.ini
new file mode 100644
index 00000000..f209964a
--- /dev/null
+++ b/3rdparty/pybind11/tests/pytest.ini
@@ -0,0 +1,16 @@
+[pytest]
+minversion = 3.0
+norecursedirs = test_cmake_build test_embed
+addopts =
+    # show summary of skipped tests
+    -rs
+    # capture only Python print and C++ py::print, but not C output (low-level Python errors)
+    --capture=sys
+filterwarnings =
+    # make warnings into errors but ignore certain third-party extension issues
+    error
+    # importing scipy submodules on some version of Python
+    ignore::ImportWarning
+    # bogus numpy ABI warning (see numpy/#432)
+    ignore:.*numpy.dtype size changed.*:RuntimeWarning
+    ignore:.*numpy.ufunc size changed.*:RuntimeWarning
diff --git a/3rdparty/pybind11/tests/test_async.cpp b/3rdparty/pybind11/tests/test_async.cpp
new file mode 100644
index 00000000..f0ad0d53
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_async.cpp
@@ -0,0 +1,26 @@
+/*
+    tests/test_async.cpp -- __await__ support
+
+    Copyright (c) 2019 Google Inc.
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+TEST_SUBMODULE(async_module, m) {
+    struct DoesNotSupportAsync {};
+    py::class_<DoesNotSupportAsync>(m, "DoesNotSupportAsync")
+        .def(py::init<>());
+    struct SupportsAsync {};
+    py::class_<SupportsAsync>(m, "SupportsAsync")
+        .def(py::init<>())
+        .def("__await__", [](const SupportsAsync& self) -> py::object {
+            static_cast<void>(self);
+            py::object loop = py::module::import("asyncio.events").attr("get_event_loop")();
+            py::object f = loop.attr("create_future")();
+            f.attr("set_result")(5);
+            return f.attr("__await__")();
+        });
+}
diff --git a/3rdparty/pybind11/tests/test_async.py b/3rdparty/pybind11/tests/test_async.py
new file mode 100644
index 00000000..e1c959d6
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_async.py
@@ -0,0 +1,23 @@
+import asyncio
+import pytest
+from pybind11_tests import async_module as m
+
+
+@pytest.fixture
+def event_loop():
+    loop = asyncio.new_event_loop()
+    yield loop
+    loop.close()
+
+
+async def get_await_result(x):
+    return await x
+
+
+def test_await(event_loop):
+    assert 5 == event_loop.run_until_complete(get_await_result(m.SupportsAsync()))
+
+
+def test_await_missing(event_loop):
+    with pytest.raises(TypeError):
+        event_loop.run_until_complete(get_await_result(m.DoesNotSupportAsync()))
diff --git a/3rdparty/pybind11/tests/test_buffers.cpp b/3rdparty/pybind11/tests/test_buffers.cpp
new file mode 100644
index 00000000..1bc67ff7
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_buffers.cpp
@@ -0,0 +1,195 @@
+/*
+    tests/test_buffers.cpp -- supporting Pythons' buffer protocol
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+
+TEST_SUBMODULE(buffers, m) {
+    // test_from_python / test_to_python:
+    class Matrix {
+    public:
+        Matrix(ssize_t rows, ssize_t cols) : m_rows(rows), m_cols(cols) {
+            print_created(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
+            m_data = new float[(size_t) (rows*cols)];
+            memset(m_data, 0, sizeof(float) * (size_t) (rows * cols));
+        }
+
+        Matrix(const Matrix &s) : m_rows(s.m_rows), m_cols(s.m_cols) {
+            print_copy_created(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
+            m_data = new float[(size_t) (m_rows * m_cols)];
+            memcpy(m_data, s.m_data, sizeof(float) * (size_t) (m_rows * m_cols));
+        }
+
+        Matrix(Matrix &&s) : m_rows(s.m_rows), m_cols(s.m_cols), m_data(s.m_data) {
+            print_move_created(this);
+            s.m_rows = 0;
+            s.m_cols = 0;
+            s.m_data = nullptr;
+        }
+
+        ~Matrix() {
+            print_destroyed(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
+            delete[] m_data;
+        }
+
+        Matrix &operator=(const Matrix &s) {
+            print_copy_assigned(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
+            delete[] m_data;
+            m_rows = s.m_rows;
+            m_cols = s.m_cols;
+            m_data = new float[(size_t) (m_rows * m_cols)];
+            memcpy(m_data, s.m_data, sizeof(float) * (size_t) (m_rows * m_cols));
+            return *this;
+        }
+
+        Matrix &operator=(Matrix &&s) {
+            print_move_assigned(this, std::to_string(m_rows) + "x" + std::to_string(m_cols) + " matrix");
+            if (&s != this) {
+                delete[] m_data;
+                m_rows = s.m_rows; m_cols = s.m_cols; m_data = s.m_data;
+                s.m_rows = 0; s.m_cols = 0; s.m_data = nullptr;
+            }
+            return *this;
+        }
+
+        float operator()(ssize_t i, ssize_t j) const {
+            return m_data[(size_t) (i*m_cols + j)];
+        }
+
+        float &operator()(ssize_t i, ssize_t j) {
+            return m_data[(size_t) (i*m_cols + j)];
+        }
+
+        float *data() { return m_data; }
+
+        ssize_t rows() const { return m_rows; }
+        ssize_t cols() const { return m_cols; }
+    private:
+        ssize_t m_rows;
+        ssize_t m_cols;
+        float *m_data;
+    };
+    py::class_<Matrix>(m, "Matrix", py::buffer_protocol())
+        .def(py::init<ssize_t, ssize_t>())
+        /// Construct from a buffer
+        .def(py::init([](py::buffer const b) {
+            py::buffer_info info = b.request();
+            if (info.format != py::format_descriptor<float>::format() || info.ndim != 2)
+                throw std::runtime_error("Incompatible buffer format!");
+
+            auto v = new Matrix(info.shape[0], info.shape[1]);
+            memcpy(v->data(), info.ptr, sizeof(float) * (size_t) (v->rows() * v->cols()));
+            return v;
+        }))
+
+       .def("rows", &Matrix::rows)
+       .def("cols", &Matrix::cols)
+
+        /// Bare bones interface
+       .def("__getitem__", [](const Matrix &m, std::pair<ssize_t, ssize_t> i) {
+            if (i.first >= m.rows() || i.second >= m.cols())
+                throw py::index_error();
+            return m(i.first, i.second);
+        })
+       .def("__setitem__", [](Matrix &m, std::pair<ssize_t, ssize_t> i, float v) {
+            if (i.first >= m.rows() || i.second >= m.cols())
+                throw py::index_error();
+            m(i.first, i.second) = v;
+        })
+       /// Provide buffer access
+       .def_buffer([](Matrix &m) -> py::buffer_info {
+            return py::buffer_info(
+                m.data(),                               /* Pointer to buffer */
+                { m.rows(), m.cols() },                 /* Buffer dimensions */
+                { sizeof(float) * size_t(m.cols()),     /* Strides (in bytes) for each index */
+                  sizeof(float) }
+            );
+        })
+        ;
+
+
+    // test_inherited_protocol
+    class SquareMatrix : public Matrix {
+    public:
+        SquareMatrix(ssize_t n) : Matrix(n, n) { }
+    };
+    // Derived classes inherit the buffer protocol and the buffer access function
+    py::class_<SquareMatrix, Matrix>(m, "SquareMatrix")
+        .def(py::init<ssize_t>());
+
+
+    // test_pointer_to_member_fn
+    // Tests that passing a pointer to member to the base class works in
+    // the derived class.
+    struct Buffer {
+        int32_t value = 0;
+
+        py::buffer_info get_buffer_info() {
+            return py::buffer_info(&value, sizeof(value),
+                                   py::format_descriptor<int32_t>::format(), 1);
+        }
+    };
+    py::class_<Buffer>(m, "Buffer", py::buffer_protocol())
+        .def(py::init<>())
+        .def_readwrite("value", &Buffer::value)
+        .def_buffer(&Buffer::get_buffer_info);
+
+
+    class ConstBuffer {
+        std::unique_ptr<int32_t> value;
+
+    public:
+        int32_t get_value() const { return *value; }
+        void set_value(int32_t v) { *value = v; }
+
+        py::buffer_info get_buffer_info() const {
+            return py::buffer_info(value.get(), sizeof(*value),
+                                   py::format_descriptor<int32_t>::format(), 1);
+        }
+
+        ConstBuffer() : value(new int32_t{0}) { };
+    };
+    py::class_<ConstBuffer>(m, "ConstBuffer", py::buffer_protocol())
+        .def(py::init<>())
+        .def_property("value", &ConstBuffer::get_value, &ConstBuffer::set_value)
+        .def_buffer(&ConstBuffer::get_buffer_info);
+
+    struct DerivedBuffer : public Buffer { };
+    py::class_<DerivedBuffer>(m, "DerivedBuffer", py::buffer_protocol())
+        .def(py::init<>())
+        .def_readwrite("value", (int32_t DerivedBuffer::*) &DerivedBuffer::value)
+        .def_buffer(&DerivedBuffer::get_buffer_info);
+
+    struct BufferReadOnly {
+        const uint8_t value = 0;
+        BufferReadOnly(uint8_t value): value(value) {}
+
+        py::buffer_info get_buffer_info() {
+            return py::buffer_info(&value, 1);
+        }
+    };
+    py::class_<BufferReadOnly>(m, "BufferReadOnly", py::buffer_protocol())
+        .def(py::init<uint8_t>())
+        .def_buffer(&BufferReadOnly::get_buffer_info);
+
+    struct BufferReadOnlySelect {
+        uint8_t value = 0;
+        bool readonly = false;
+
+        py::buffer_info get_buffer_info() {
+            return py::buffer_info(&value, 1, readonly);
+        }
+    };
+    py::class_<BufferReadOnlySelect>(m, "BufferReadOnlySelect", py::buffer_protocol())
+        .def(py::init<>())
+        .def_readwrite("value", &BufferReadOnlySelect::value)
+        .def_readwrite("readonly", &BufferReadOnlySelect::readonly)
+        .def_buffer(&BufferReadOnlySelect::get_buffer_info);
+
+}
diff --git a/3rdparty/pybind11/tests/test_buffers.py b/3rdparty/pybind11/tests/test_buffers.py
new file mode 100644
index 00000000..bf7aaed7
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_buffers.py
@@ -0,0 +1,118 @@
+import io
+import struct
+import sys
+
+import pytest
+
+from pybind11_tests import buffers as m
+from pybind11_tests import ConstructorStats
+
+PY3 = sys.version_info[0] >= 3
+
+pytestmark = pytest.requires_numpy
+
+with pytest.suppress(ImportError):
+    import numpy as np
+
+
+def test_from_python():
+    with pytest.raises(RuntimeError) as excinfo:
+        m.Matrix(np.array([1, 2, 3]))  # trying to assign a 1D array
+    assert str(excinfo.value) == "Incompatible buffer format!"
+
+    m3 = np.array([[1, 2, 3], [4, 5, 6]]).astype(np.float32)
+    m4 = m.Matrix(m3)
+
+    for i in range(m4.rows()):
+        for j in range(m4.cols()):
+            assert m3[i, j] == m4[i, j]
+
+    cstats = ConstructorStats.get(m.Matrix)
+    assert cstats.alive() == 1
+    del m3, m4
+    assert cstats.alive() == 0
+    assert cstats.values() == ["2x3 matrix"]
+    assert cstats.copy_constructions == 0
+    # assert cstats.move_constructions >= 0  # Don't invoke any
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+
+# PyPy: Memory leak in the "np.array(m, copy=False)" call
+# https://bitbucket.org/pypy/pypy/issues/2444
+@pytest.unsupported_on_pypy
+def test_to_python():
+    mat = m.Matrix(5, 4)
+    assert memoryview(mat).shape == (5, 4)
+
+    assert mat[2, 3] == 0
+    mat[2, 3] = 4.0
+    mat[3, 2] = 7.0
+    assert mat[2, 3] == 4
+    assert mat[3, 2] == 7
+    assert struct.unpack_from('f', mat, (3 * 4 + 2) * 4) == (7, )
+    assert struct.unpack_from('f', mat, (2 * 4 + 3) * 4) == (4, )
+
+    mat2 = np.array(mat, copy=False)
+    assert mat2.shape == (5, 4)
+    assert abs(mat2).sum() == 11
+    assert mat2[2, 3] == 4 and mat2[3, 2] == 7
+    mat2[2, 3] = 5
+    assert mat2[2, 3] == 5
+
+    cstats = ConstructorStats.get(m.Matrix)
+    assert cstats.alive() == 1
+    del mat
+    pytest.gc_collect()
+    assert cstats.alive() == 1
+    del mat2  # holds a mat reference
+    pytest.gc_collect()
+    assert cstats.alive() == 0
+    assert cstats.values() == ["5x4 matrix"]
+    assert cstats.copy_constructions == 0
+    # assert cstats.move_constructions >= 0  # Don't invoke any
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+
+@pytest.unsupported_on_pypy
+def test_inherited_protocol():
+    """SquareMatrix is derived from Matrix and inherits the buffer protocol"""
+
+    matrix = m.SquareMatrix(5)
+    assert memoryview(matrix).shape == (5, 5)
+    assert np.asarray(matrix).shape == (5, 5)
+
+
+@pytest.unsupported_on_pypy
+def test_pointer_to_member_fn():
+    for cls in [m.Buffer, m.ConstBuffer, m.DerivedBuffer]:
+        buf = cls()
+        buf.value = 0x12345678
+        value = struct.unpack('i', bytearray(buf))[0]
+        assert value == 0x12345678
+
+
+@pytest.unsupported_on_pypy
+def test_readonly_buffer():
+    buf = m.BufferReadOnly(0x64)
+    view = memoryview(buf)
+    assert view[0] == 0x64 if PY3 else b'd'
+    assert view.readonly
+
+
+@pytest.unsupported_on_pypy
+def test_selective_readonly_buffer():
+    buf = m.BufferReadOnlySelect()
+
+    memoryview(buf)[0] = 0x64 if PY3 else b'd'
+    assert buf.value == 0x64
+
+    io.BytesIO(b'A').readinto(buf)
+    assert buf.value == ord(b'A')
+
+    buf.readonly = True
+    with pytest.raises(TypeError):
+        memoryview(buf)[0] = 0 if PY3 else b'\0'
+    with pytest.raises(TypeError):
+        io.BytesIO(b'1').readinto(buf)
diff --git a/3rdparty/pybind11/tests/test_builtin_casters.cpp b/3rdparty/pybind11/tests/test_builtin_casters.cpp
new file mode 100644
index 00000000..acb24469
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_builtin_casters.cpp
@@ -0,0 +1,188 @@
+/*
+    tests/test_builtin_casters.cpp -- Casters available without any additional headers
+
+    Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/complex.h>
+
+#if defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
+#endif
+
+TEST_SUBMODULE(builtin_casters, m) {
+    // test_simple_string
+    m.def("string_roundtrip", [](const char *s) { return s; });
+
+    // test_unicode_conversion
+    // Some test characters in utf16 and utf32 encodings.  The last one (the 𝐀) contains a null byte
+    char32_t a32 = 0x61 /*a*/, z32 = 0x7a /*z*/, ib32 = 0x203d /*‽*/, cake32 = 0x1f382 /*🎂*/,              mathbfA32 = 0x1d400 /*𝐀*/;
+    char16_t b16 = 0x62 /*b*/, z16 = 0x7a,       ib16 = 0x203d,       cake16_1 = 0xd83c, cake16_2 = 0xdf82, mathbfA16_1 = 0xd835, mathbfA16_2 = 0xdc00;
+    std::wstring wstr;
+    wstr.push_back(0x61); // a
+    wstr.push_back(0x2e18); // ⸘
+    if (sizeof(wchar_t) == 2) { wstr.push_back(mathbfA16_1); wstr.push_back(mathbfA16_2); } // 𝐀, utf16
+    else { wstr.push_back((wchar_t) mathbfA32); } // 𝐀, utf32
+    wstr.push_back(0x7a); // z
+
+    m.def("good_utf8_string", []() { return std::string((const char*)u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 🎂 𝐀
+    m.def("good_utf16_string", [=]() { return std::u16string({ b16, ib16, cake16_1, cake16_2, mathbfA16_1, mathbfA16_2, z16 }); }); // b‽🎂𝐀z
+    m.def("good_utf32_string", [=]() { return std::u32string({ a32, mathbfA32, cake32, ib32, z32 }); }); // a𝐀🎂‽z
+    m.def("good_wchar_string", [=]() { return wstr; }); // a‽𝐀z
+    m.def("bad_utf8_string", []()  { return std::string("abc\xd0" "def"); });
+    m.def("bad_utf16_string", [=]() { return std::u16string({ b16, char16_t(0xd800), z16 }); });
+    // Under Python 2.7, invalid unicode UTF-32 characters don't appear to trigger UnicodeDecodeError
+    if (PY_MAJOR_VERSION >= 3)
+        m.def("bad_utf32_string", [=]() { return std::u32string({ a32, char32_t(0xd800), z32 }); });
+    if (PY_MAJOR_VERSION >= 3 || sizeof(wchar_t) == 2)
+        m.def("bad_wchar_string", [=]() { return std::wstring({ wchar_t(0x61), wchar_t(0xd800) }); });
+    m.def("u8_Z", []() -> char { return 'Z'; });
+    m.def("u8_eacute", []() -> char { return '\xe9'; });
+    m.def("u16_ibang", [=]() -> char16_t { return ib16; });
+    m.def("u32_mathbfA", [=]() -> char32_t { return mathbfA32; });
+    m.def("wchar_heart", []() -> wchar_t { return 0x2665; });
+
+    // test_single_char_arguments
+    m.attr("wchar_size") = py::cast(sizeof(wchar_t));
+    m.def("ord_char", [](char c) -> int { return static_cast<unsigned char>(c); });
+    m.def("ord_char_lv", [](char &c) -> int { return static_cast<unsigned char>(c); });
+    m.def("ord_char16", [](char16_t c) -> uint16_t { return c; });
+    m.def("ord_char16_lv", [](char16_t &c) -> uint16_t { return c; });
+    m.def("ord_char32", [](char32_t c) -> uint32_t { return c; });
+    m.def("ord_wchar", [](wchar_t c) -> int { return c; });
+
+    // test_bytes_to_string
+    m.def("strlen", [](char *s) { return strlen(s); });
+    m.def("string_length", [](std::string s) { return s.length(); });
+
+#ifdef PYBIND11_HAS_U8STRING
+    m.attr("has_u8string") = true;
+    m.def("good_utf8_u8string", []() { return std::u8string(u8"Say utf8\u203d \U0001f382 \U0001d400"); }); // Say utf8‽ 🎂 𝐀
+    m.def("bad_utf8_u8string", []()  { return std::u8string((const char8_t*)"abc\xd0" "def"); });
+
+    m.def("u8_char8_Z", []() -> char8_t { return u8'Z'; });
+
+    // test_single_char_arguments
+    m.def("ord_char8", [](char8_t c) -> int { return static_cast<unsigned char>(c); });
+    m.def("ord_char8_lv", [](char8_t &c) -> int { return static_cast<unsigned char>(c); });
+#endif
+
+    // test_string_view
+#ifdef PYBIND11_HAS_STRING_VIEW
+    m.attr("has_string_view") = true;
+    m.def("string_view_print",   [](std::string_view s)    { py::print(s, s.size()); });
+    m.def("string_view16_print", [](std::u16string_view s) { py::print(s, s.size()); });
+    m.def("string_view32_print", [](std::u32string_view s) { py::print(s, s.size()); });
+    m.def("string_view_chars",   [](std::string_view s)    { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; });
+    m.def("string_view16_chars", [](std::u16string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; });
+    m.def("string_view32_chars", [](std::u32string_view s) { py::list l; for (auto c : s) l.append((int) c); return l; });
+    m.def("string_view_return",   []() { return std::string_view((const char*)u8"utf8 secret \U0001f382"); });
+    m.def("string_view16_return", []() { return std::u16string_view(u"utf16 secret \U0001f382"); });
+    m.def("string_view32_return", []() { return std::u32string_view(U"utf32 secret \U0001f382"); });
+
+#   ifdef PYBIND11_HAS_U8STRING
+    m.def("string_view8_print",  [](std::u8string_view s) { py::print(s, s.size()); });
+    m.def("string_view8_chars",  [](std::u8string_view s) { py::list l; for (auto c : s) l.append((std::uint8_t) c); return l; });
+    m.def("string_view8_return", []() { return std::u8string_view(u8"utf8 secret \U0001f382"); });
+#   endif
+#endif
+
+    // test_integer_casting
+    m.def("i32_str", [](std::int32_t v) { return std::to_string(v); });
+    m.def("u32_str", [](std::uint32_t v) { return std::to_string(v); });
+    m.def("i64_str", [](std::int64_t v) { return std::to_string(v); });
+    m.def("u64_str", [](std::uint64_t v) { return std::to_string(v); });
+
+    // test_tuple
+    m.def("pair_passthrough", [](std::pair<bool, std::string> input) {
+        return std::make_pair(input.second, input.first);
+    }, "Return a pair in reversed order");
+    m.def("tuple_passthrough", [](std::tuple<bool, std::string, int> input) {
+        return std::make_tuple(std::get<2>(input), std::get<1>(input), std::get<0>(input));
+    }, "Return a triple in reversed order");
+    m.def("empty_tuple", []() { return std::tuple<>(); });
+    static std::pair<RValueCaster, RValueCaster> lvpair;
+    static std::tuple<RValueCaster, RValueCaster, RValueCaster> lvtuple;
+    static std::pair<RValueCaster, std::tuple<RValueCaster, std::pair<RValueCaster, RValueCaster>>> lvnested;
+    m.def("rvalue_pair", []() { return std::make_pair(RValueCaster{}, RValueCaster{}); });
+    m.def("lvalue_pair", []() -> const decltype(lvpair) & { return lvpair; });
+    m.def("rvalue_tuple", []() { return std::make_tuple(RValueCaster{}, RValueCaster{}, RValueCaster{}); });
+    m.def("lvalue_tuple", []() -> const decltype(lvtuple) & { return lvtuple; });
+    m.def("rvalue_nested", []() {
+        return std::make_pair(RValueCaster{}, std::make_tuple(RValueCaster{}, std::make_pair(RValueCaster{}, RValueCaster{}))); });
+    m.def("lvalue_nested", []() -> const decltype(lvnested) & { return lvnested; });
+
+    // test_builtins_cast_return_none
+    m.def("return_none_string", []() -> std::string * { return nullptr; });
+    m.def("return_none_char",   []() -> const char *  { return nullptr; });
+    m.def("return_none_bool",   []() -> bool *        { return nullptr; });
+    m.def("return_none_int",    []() -> int *         { return nullptr; });
+    m.def("return_none_float",  []() -> float *       { return nullptr; });
+
+    // test_none_deferred
+    m.def("defer_none_cstring", [](char *) { return false; });
+    m.def("defer_none_cstring", [](py::none) { return true; });
+    m.def("defer_none_custom", [](UserType *) { return false; });
+    m.def("defer_none_custom", [](py::none) { return true; });
+    m.def("nodefer_none_void", [](void *) { return true; });
+    m.def("nodefer_none_void", [](py::none) { return false; });
+
+    // test_void_caster
+    m.def("load_nullptr_t", [](std::nullptr_t) {}); // not useful, but it should still compile
+    m.def("cast_nullptr_t", []() { return std::nullptr_t{}; });
+
+    // test_bool_caster
+    m.def("bool_passthrough", [](bool arg) { return arg; });
+    m.def("bool_passthrough_noconvert", [](bool arg) { return arg; }, py::arg().noconvert());
+
+    // test_reference_wrapper
+    m.def("refwrap_builtin", [](std::reference_wrapper<int> p) { return 10 * p.get(); });
+    m.def("refwrap_usertype", [](std::reference_wrapper<UserType> p) { return p.get().value(); });
+    // Not currently supported (std::pair caster has return-by-value cast operator);
+    // triggers static_assert failure.
+    //m.def("refwrap_pair", [](std::reference_wrapper<std::pair<int, int>>) { });
+
+    m.def("refwrap_list", [](bool copy) {
+        static IncType x1(1), x2(2);
+        py::list l;
+        for (auto &f : {std::ref(x1), std::ref(x2)}) {
+            l.append(py::cast(f, copy ? py::return_value_policy::copy
+                                      : py::return_value_policy::reference));
+        }
+        return l;
+    }, "copy"_a);
+
+    m.def("refwrap_iiw", [](const IncType &w) { return w.value(); });
+    m.def("refwrap_call_iiw", [](IncType &w, py::function f) {
+        py::list l;
+        l.append(f(std::ref(w)));
+        l.append(f(std::cref(w)));
+        IncType x(w.value());
+        l.append(f(std::ref(x)));
+        IncType y(w.value());
+        auto r3 = std::ref(y);
+        l.append(f(r3));
+        return l;
+    });
+
+    // test_complex
+    m.def("complex_cast", [](float x) { return "{}"_s.format(x); });
+    m.def("complex_cast", [](std::complex<float> x) { return "({}, {})"_s.format(x.real(), x.imag()); });
+
+    // test int vs. long (Python 2)
+    m.def("int_cast", []() {return (int) 42;});
+    m.def("long_cast", []() {return (long) 42;});
+    m.def("longlong_cast", []() {return  ULLONG_MAX;});
+
+    /// test void* cast operator
+    m.def("test_void_caster", []() -> bool {
+        void *v = (void *) 0xabcd;
+        py::object o = py::cast(v);
+        return py::cast<void *>(o) == v;
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_builtin_casters.py b/3rdparty/pybind11/tests/test_builtin_casters.py
new file mode 100644
index 00000000..91422588
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_builtin_casters.py
@@ -0,0 +1,385 @@
+# Python < 3 needs this: coding=utf-8
+import pytest
+
+from pybind11_tests import builtin_casters as m
+from pybind11_tests import UserType, IncType
+
+
+def test_simple_string():
+    assert m.string_roundtrip("const char *") == "const char *"
+
+
+def test_unicode_conversion():
+    """Tests unicode conversion and error reporting."""
+    assert m.good_utf8_string() == u"Say utf8‽ 🎂 𝐀"
+    assert m.good_utf16_string() == u"b‽🎂𝐀z"
+    assert m.good_utf32_string() == u"a𝐀🎂‽z"
+    assert m.good_wchar_string() == u"a⸘𝐀z"
+    if hasattr(m, "has_u8string"):
+        assert m.good_utf8_u8string() == u"Say utf8‽ 🎂 𝐀"
+
+    with pytest.raises(UnicodeDecodeError):
+        m.bad_utf8_string()
+
+    with pytest.raises(UnicodeDecodeError):
+        m.bad_utf16_string()
+
+    # These are provided only if they actually fail (they don't when 32-bit and under Python 2.7)
+    if hasattr(m, "bad_utf32_string"):
+        with pytest.raises(UnicodeDecodeError):
+            m.bad_utf32_string()
+    if hasattr(m, "bad_wchar_string"):
+        with pytest.raises(UnicodeDecodeError):
+            m.bad_wchar_string()
+    if hasattr(m, "has_u8string"):
+        with pytest.raises(UnicodeDecodeError):
+            m.bad_utf8_u8string()
+
+    assert m.u8_Z() == 'Z'
+    assert m.u8_eacute() == u'é'
+    assert m.u16_ibang() == u'‽'
+    assert m.u32_mathbfA() == u'𝐀'
+    assert m.wchar_heart() == u'♥'
+    if hasattr(m, "has_u8string"):
+        assert m.u8_char8_Z() == 'Z'
+
+
+def test_single_char_arguments():
+    """Tests failures for passing invalid inputs to char-accepting functions"""
+    def toobig_message(r):
+        return "Character code point not in range({0:#x})".format(r)
+    toolong_message = "Expected a character, but multi-character string found"
+
+    assert m.ord_char(u'a') == 0x61  # simple ASCII
+    assert m.ord_char_lv(u'b') == 0x62
+    assert m.ord_char(u'é') == 0xE9  # requires 2 bytes in utf-8, but can be stuffed in a char
+    with pytest.raises(ValueError) as excinfo:
+        assert m.ord_char(u'Ā') == 0x100  # requires 2 bytes, doesn't fit in a char
+    assert str(excinfo.value) == toobig_message(0x100)
+    with pytest.raises(ValueError) as excinfo:
+        assert m.ord_char(u'ab')
+    assert str(excinfo.value) == toolong_message
+
+    assert m.ord_char16(u'a') == 0x61
+    assert m.ord_char16(u'é') == 0xE9
+    assert m.ord_char16_lv(u'ê') == 0xEA
+    assert m.ord_char16(u'Ā') == 0x100
+    assert m.ord_char16(u'‽') == 0x203d
+    assert m.ord_char16(u'♥') == 0x2665
+    assert m.ord_char16_lv(u'♡') == 0x2661
+    with pytest.raises(ValueError) as excinfo:
+        assert m.ord_char16(u'🎂') == 0x1F382  # requires surrogate pair
+    assert str(excinfo.value) == toobig_message(0x10000)
+    with pytest.raises(ValueError) as excinfo:
+        assert m.ord_char16(u'aa')
+    assert str(excinfo.value) == toolong_message
+
+    assert m.ord_char32(u'a') == 0x61
+    assert m.ord_char32(u'é') == 0xE9
+    assert m.ord_char32(u'Ā') == 0x100
+    assert m.ord_char32(u'‽') == 0x203d
+    assert m.ord_char32(u'♥') == 0x2665
+    assert m.ord_char32(u'🎂') == 0x1F382
+    with pytest.raises(ValueError) as excinfo:
+        assert m.ord_char32(u'aa')
+    assert str(excinfo.value) == toolong_message
+
+    assert m.ord_wchar(u'a') == 0x61
+    assert m.ord_wchar(u'é') == 0xE9
+    assert m.ord_wchar(u'Ā') == 0x100
+    assert m.ord_wchar(u'‽') == 0x203d
+    assert m.ord_wchar(u'♥') == 0x2665
+    if m.wchar_size == 2:
+        with pytest.raises(ValueError) as excinfo:
+            assert m.ord_wchar(u'🎂') == 0x1F382  # requires surrogate pair
+        assert str(excinfo.value) == toobig_message(0x10000)
+    else:
+        assert m.ord_wchar(u'🎂') == 0x1F382
+    with pytest.raises(ValueError) as excinfo:
+        assert m.ord_wchar(u'aa')
+    assert str(excinfo.value) == toolong_message
+
+    if hasattr(m, "has_u8string"):
+        assert m.ord_char8(u'a') == 0x61  # simple ASCII
+        assert m.ord_char8_lv(u'b') == 0x62
+        assert m.ord_char8(u'é') == 0xE9  # requires 2 bytes in utf-8, but can be stuffed in a char
+        with pytest.raises(ValueError) as excinfo:
+            assert m.ord_char8(u'Ā') == 0x100  # requires 2 bytes, doesn't fit in a char
+        assert str(excinfo.value) == toobig_message(0x100)
+        with pytest.raises(ValueError) as excinfo:
+            assert m.ord_char8(u'ab')
+        assert str(excinfo.value) == toolong_message
+
+
+def test_bytes_to_string():
+    """Tests the ability to pass bytes to C++ string-accepting functions.  Note that this is
+    one-way: the only way to return bytes to Python is via the pybind11::bytes class."""
+    # Issue #816
+    import sys
+    byte = bytes if sys.version_info[0] < 3 else str
+
+    assert m.strlen(byte("hi")) == 2
+    assert m.string_length(byte("world")) == 5
+    assert m.string_length(byte("a\x00b")) == 3
+    assert m.strlen(byte("a\x00b")) == 1  # C-string limitation
+
+    # passing in a utf8 encoded string should work
+    assert m.string_length(u'💩'.encode("utf8")) == 4
+
+
+@pytest.mark.skipif(not hasattr(m, "has_string_view"), reason="no <string_view>")
+def test_string_view(capture):
+    """Tests support for C++17 string_view arguments and return values"""
+    assert m.string_view_chars("Hi") == [72, 105]
+    assert m.string_view_chars("Hi 🎂") == [72, 105, 32, 0xf0, 0x9f, 0x8e, 0x82]
+    assert m.string_view16_chars("Hi 🎂") == [72, 105, 32, 0xd83c, 0xdf82]
+    assert m.string_view32_chars("Hi 🎂") == [72, 105, 32, 127874]
+    if hasattr(m, "has_u8string"):
+        assert m.string_view8_chars("Hi") == [72, 105]
+        assert m.string_view8_chars("Hi 🎂") == [72, 105, 32, 0xf0, 0x9f, 0x8e, 0x82]
+
+    assert m.string_view_return() == "utf8 secret 🎂"
+    assert m.string_view16_return() == "utf16 secret 🎂"
+    assert m.string_view32_return() == "utf32 secret 🎂"
+    if hasattr(m, "has_u8string"):
+        assert m.string_view8_return() == "utf8 secret 🎂"
+
+    with capture:
+        m.string_view_print("Hi")
+        m.string_view_print("utf8 🎂")
+        m.string_view16_print("utf16 🎂")
+        m.string_view32_print("utf32 🎂")
+    assert capture == """
+        Hi 2
+        utf8 🎂 9
+        utf16 🎂 8
+        utf32 🎂 7
+    """
+    if hasattr(m, "has_u8string"):
+        with capture:
+            m.string_view8_print("Hi")
+            m.string_view8_print("utf8 🎂")
+        assert capture == """
+            Hi 2
+            utf8 🎂 9
+        """
+
+    with capture:
+        m.string_view_print("Hi, ascii")
+        m.string_view_print("Hi, utf8 🎂")
+        m.string_view16_print("Hi, utf16 🎂")
+        m.string_view32_print("Hi, utf32 🎂")
+    assert capture == """
+        Hi, ascii 9
+        Hi, utf8 🎂 13
+        Hi, utf16 🎂 12
+        Hi, utf32 🎂 11
+    """
+    if hasattr(m, "has_u8string"):
+        with capture:
+            m.string_view8_print("Hi, ascii")
+            m.string_view8_print("Hi, utf8 🎂")
+        assert capture == """
+            Hi, ascii 9
+            Hi, utf8 🎂 13
+        """
+
+
+def test_integer_casting():
+    """Issue #929 - out-of-range integer values shouldn't be accepted"""
+    import sys
+    assert m.i32_str(-1) == "-1"
+    assert m.i64_str(-1) == "-1"
+    assert m.i32_str(2000000000) == "2000000000"
+    assert m.u32_str(2000000000) == "2000000000"
+    if sys.version_info < (3,):
+        assert m.i32_str(long(-1)) == "-1"  # noqa: F821 undefined name 'long'
+        assert m.i64_str(long(-1)) == "-1"  # noqa: F821 undefined name 'long'
+        assert m.i64_str(long(-999999999999)) == "-999999999999"  # noqa: F821 undefined name
+        assert m.u64_str(long(999999999999)) == "999999999999"  # noqa: F821 undefined name 'long'
+    else:
+        assert m.i64_str(-999999999999) == "-999999999999"
+        assert m.u64_str(999999999999) == "999999999999"
+
+    with pytest.raises(TypeError) as excinfo:
+        m.u32_str(-1)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.u64_str(-1)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.i32_str(-3000000000)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.i32_str(3000000000)
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    if sys.version_info < (3,):
+        with pytest.raises(TypeError) as excinfo:
+            m.u32_str(long(-1))  # noqa: F821 undefined name 'long'
+        assert "incompatible function arguments" in str(excinfo.value)
+        with pytest.raises(TypeError) as excinfo:
+            m.u64_str(long(-1))  # noqa: F821 undefined name 'long'
+        assert "incompatible function arguments" in str(excinfo.value)
+
+
+def test_tuple(doc):
+    """std::pair <-> tuple & std::tuple <-> tuple"""
+    assert m.pair_passthrough((True, "test")) == ("test", True)
+    assert m.tuple_passthrough((True, "test", 5)) == (5, "test", True)
+    # Any sequence can be cast to a std::pair or std::tuple
+    assert m.pair_passthrough([True, "test"]) == ("test", True)
+    assert m.tuple_passthrough([True, "test", 5]) == (5, "test", True)
+    assert m.empty_tuple() == ()
+
+    assert doc(m.pair_passthrough) == """
+        pair_passthrough(arg0: Tuple[bool, str]) -> Tuple[str, bool]
+
+        Return a pair in reversed order
+    """
+    assert doc(m.tuple_passthrough) == """
+        tuple_passthrough(arg0: Tuple[bool, str, int]) -> Tuple[int, str, bool]
+
+        Return a triple in reversed order
+    """
+
+    assert m.rvalue_pair() == ("rvalue", "rvalue")
+    assert m.lvalue_pair() == ("lvalue", "lvalue")
+    assert m.rvalue_tuple() == ("rvalue", "rvalue", "rvalue")
+    assert m.lvalue_tuple() == ("lvalue", "lvalue", "lvalue")
+    assert m.rvalue_nested() == ("rvalue", ("rvalue", ("rvalue", "rvalue")))
+    assert m.lvalue_nested() == ("lvalue", ("lvalue", ("lvalue", "lvalue")))
+
+
+def test_builtins_cast_return_none():
+    """Casters produced with PYBIND11_TYPE_CASTER() should convert nullptr to None"""
+    assert m.return_none_string() is None
+    assert m.return_none_char() is None
+    assert m.return_none_bool() is None
+    assert m.return_none_int() is None
+    assert m.return_none_float() is None
+
+
+def test_none_deferred():
+    """None passed as various argument types should defer to other overloads"""
+    assert not m.defer_none_cstring("abc")
+    assert m.defer_none_cstring(None)
+    assert not m.defer_none_custom(UserType())
+    assert m.defer_none_custom(None)
+    assert m.nodefer_none_void(None)
+
+
+def test_void_caster():
+    assert m.load_nullptr_t(None) is None
+    assert m.cast_nullptr_t() is None
+
+
+def test_reference_wrapper():
+    """std::reference_wrapper for builtin and user types"""
+    assert m.refwrap_builtin(42) == 420
+    assert m.refwrap_usertype(UserType(42)) == 42
+
+    with pytest.raises(TypeError) as excinfo:
+        m.refwrap_builtin(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    with pytest.raises(TypeError) as excinfo:
+        m.refwrap_usertype(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    a1 = m.refwrap_list(copy=True)
+    a2 = m.refwrap_list(copy=True)
+    assert [x.value for x in a1] == [2, 3]
+    assert [x.value for x in a2] == [2, 3]
+    assert not a1[0] is a2[0] and not a1[1] is a2[1]
+
+    b1 = m.refwrap_list(copy=False)
+    b2 = m.refwrap_list(copy=False)
+    assert [x.value for x in b1] == [1, 2]
+    assert [x.value for x in b2] == [1, 2]
+    assert b1[0] is b2[0] and b1[1] is b2[1]
+
+    assert m.refwrap_iiw(IncType(5)) == 5
+    assert m.refwrap_call_iiw(IncType(10), m.refwrap_iiw) == [10, 10, 10, 10]
+
+
+def test_complex_cast():
+    """std::complex casts"""
+    assert m.complex_cast(1) == "1.0"
+    assert m.complex_cast(2j) == "(0.0, 2.0)"
+
+
+def test_bool_caster():
+    """Test bool caster implicit conversions."""
+    convert, noconvert = m.bool_passthrough, m.bool_passthrough_noconvert
+
+    def require_implicit(v):
+        pytest.raises(TypeError, noconvert, v)
+
+    def cant_convert(v):
+        pytest.raises(TypeError, convert, v)
+
+    # straight up bool
+    assert convert(True) is True
+    assert convert(False) is False
+    assert noconvert(True) is True
+    assert noconvert(False) is False
+
+    # None requires implicit conversion
+    require_implicit(None)
+    assert convert(None) is False
+
+    class A(object):
+        def __init__(self, x):
+            self.x = x
+
+        def __nonzero__(self):
+            return self.x
+
+        def __bool__(self):
+            return self.x
+
+    class B(object):
+        pass
+
+    # Arbitrary objects are not accepted
+    cant_convert(object())
+    cant_convert(B())
+
+    # Objects with __nonzero__ / __bool__ defined can be converted
+    require_implicit(A(True))
+    assert convert(A(True)) is True
+    assert convert(A(False)) is False
+
+
+@pytest.requires_numpy
+def test_numpy_bool():
+    import numpy as np
+    convert, noconvert = m.bool_passthrough, m.bool_passthrough_noconvert
+
+    def cant_convert(v):
+        pytest.raises(TypeError, convert, v)
+
+    # np.bool_ is not considered implicit
+    assert convert(np.bool_(True)) is True
+    assert convert(np.bool_(False)) is False
+    assert noconvert(np.bool_(True)) is True
+    assert noconvert(np.bool_(False)) is False
+    cant_convert(np.zeros(2, dtype='int'))
+
+
+def test_int_long():
+    """In Python 2, a C++ int should return a Python int rather than long
+    if possible: longs are not always accepted where ints are used (such
+    as the argument to sys.exit()). A C++ long long is always a Python
+    long."""
+
+    import sys
+    must_be_long = type(getattr(sys, 'maxint', 1) + 1)
+    assert isinstance(m.int_cast(), int)
+    assert isinstance(m.long_cast(), int)
+    assert isinstance(m.longlong_cast(), must_be_long)
+
+
+def test_void_caster_2():
+    assert m.test_void_caster()
diff --git a/3rdparty/pybind11/tests/test_call_policies.cpp b/3rdparty/pybind11/tests/test_call_policies.cpp
new file mode 100644
index 00000000..fd245578
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_call_policies.cpp
@@ -0,0 +1,100 @@
+/*
+    tests/test_call_policies.cpp -- keep_alive and call_guard
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+struct CustomGuard {
+    static bool enabled;
+
+    CustomGuard() { enabled = true; }
+    ~CustomGuard() { enabled = false; }
+
+    static const char *report_status() { return enabled ? "guarded" : "unguarded"; }
+};
+bool CustomGuard::enabled = false;
+
+struct DependentGuard {
+    static bool enabled;
+
+    DependentGuard() { enabled = CustomGuard::enabled; }
+    ~DependentGuard() { enabled = false; }
+
+    static const char *report_status() { return enabled ? "guarded" : "unguarded"; }
+};
+bool DependentGuard::enabled = false;
+
+TEST_SUBMODULE(call_policies, m) {
+    // Parent/Child are used in:
+    // test_keep_alive_argument, test_keep_alive_return_value, test_alive_gc_derived,
+    // test_alive_gc_multi_derived, test_return_none, test_keep_alive_constructor
+    class Child {
+    public:
+        Child() { py::print("Allocating child."); }
+        Child(const Child &) = default;
+        Child(Child &&) = default;
+        ~Child() { py::print("Releasing child."); }
+    };
+    py::class_<Child>(m, "Child")
+        .def(py::init<>());
+
+    class Parent {
+    public:
+        Parent() { py::print("Allocating parent."); }
+        ~Parent() { py::print("Releasing parent."); }
+        void addChild(Child *) { }
+        Child *returnChild() { return new Child(); }
+        Child *returnNullChild() { return nullptr; }
+    };
+    py::class_<Parent>(m, "Parent")
+        .def(py::init<>())
+        .def(py::init([](Child *) { return new Parent(); }), py::keep_alive<1, 2>())
+        .def("addChild", &Parent::addChild)
+        .def("addChildKeepAlive", &Parent::addChild, py::keep_alive<1, 2>())
+        .def("returnChild", &Parent::returnChild)
+        .def("returnChildKeepAlive", &Parent::returnChild, py::keep_alive<1, 0>())
+        .def("returnNullChildKeepAliveChild", &Parent::returnNullChild, py::keep_alive<1, 0>())
+        .def("returnNullChildKeepAliveParent", &Parent::returnNullChild, py::keep_alive<0, 1>());
+
+#if !defined(PYPY_VERSION)
+    // test_alive_gc
+    class ParentGC : public Parent {
+    public:
+        using Parent::Parent;
+    };
+    py::class_<ParentGC, Parent>(m, "ParentGC", py::dynamic_attr())
+        .def(py::init<>());
+#endif
+
+    // test_call_guard
+    m.def("unguarded_call", &CustomGuard::report_status);
+    m.def("guarded_call", &CustomGuard::report_status, py::call_guard<CustomGuard>());
+
+    m.def("multiple_guards_correct_order", []() {
+        return CustomGuard::report_status() + std::string(" & ") + DependentGuard::report_status();
+    }, py::call_guard<CustomGuard, DependentGuard>());
+
+    m.def("multiple_guards_wrong_order", []() {
+        return DependentGuard::report_status() + std::string(" & ") + CustomGuard::report_status();
+    }, py::call_guard<DependentGuard, CustomGuard>());
+
+#if defined(WITH_THREAD) && !defined(PYPY_VERSION)
+    // `py::call_guard<py::gil_scoped_release>()` should work in PyPy as well,
+    // but it's unclear how to test it without `PyGILState_GetThisThreadState`.
+    auto report_gil_status = []() {
+        auto is_gil_held = false;
+        if (auto tstate = py::detail::get_thread_state_unchecked())
+            is_gil_held = (tstate == PyGILState_GetThisThreadState());
+
+        return is_gil_held ? "GIL held" : "GIL released";
+    };
+
+    m.def("with_gil", report_gil_status);
+    m.def("without_gil", report_gil_status, py::call_guard<py::gil_scoped_release>());
+#endif
+}
diff --git a/3rdparty/pybind11/tests/test_call_policies.py b/3rdparty/pybind11/tests/test_call_policies.py
new file mode 100644
index 00000000..7c835599
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_call_policies.py
@@ -0,0 +1,187 @@
+import pytest
+from pybind11_tests import call_policies as m
+from pybind11_tests import ConstructorStats
+
+
+def test_keep_alive_argument(capture):
+    n_inst = ConstructorStats.detail_reg_inst()
+    with capture:
+        p = m.Parent()
+    assert capture == "Allocating parent."
+    with capture:
+        p.addChild(m.Child())
+        assert ConstructorStats.detail_reg_inst() == n_inst + 1
+    assert capture == """
+        Allocating child.
+        Releasing child.
+    """
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == "Releasing parent."
+
+    with capture:
+        p = m.Parent()
+    assert capture == "Allocating parent."
+    with capture:
+        p.addChildKeepAlive(m.Child())
+        assert ConstructorStats.detail_reg_inst() == n_inst + 2
+    assert capture == "Allocating child."
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == """
+        Releasing parent.
+        Releasing child.
+    """
+
+
+def test_keep_alive_return_value(capture):
+    n_inst = ConstructorStats.detail_reg_inst()
+    with capture:
+        p = m.Parent()
+    assert capture == "Allocating parent."
+    with capture:
+        p.returnChild()
+        assert ConstructorStats.detail_reg_inst() == n_inst + 1
+    assert capture == """
+        Allocating child.
+        Releasing child.
+    """
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == "Releasing parent."
+
+    with capture:
+        p = m.Parent()
+    assert capture == "Allocating parent."
+    with capture:
+        p.returnChildKeepAlive()
+        assert ConstructorStats.detail_reg_inst() == n_inst + 2
+    assert capture == "Allocating child."
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == """
+        Releasing parent.
+        Releasing child.
+    """
+
+
+# https://bitbucket.org/pypy/pypy/issues/2447
+@pytest.unsupported_on_pypy
+def test_alive_gc(capture):
+    n_inst = ConstructorStats.detail_reg_inst()
+    p = m.ParentGC()
+    p.addChildKeepAlive(m.Child())
+    assert ConstructorStats.detail_reg_inst() == n_inst + 2
+    lst = [p]
+    lst.append(lst)   # creates a circular reference
+    with capture:
+        del p, lst
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == """
+        Releasing parent.
+        Releasing child.
+    """
+
+
+def test_alive_gc_derived(capture):
+    class Derived(m.Parent):
+        pass
+
+    n_inst = ConstructorStats.detail_reg_inst()
+    p = Derived()
+    p.addChildKeepAlive(m.Child())
+    assert ConstructorStats.detail_reg_inst() == n_inst + 2
+    lst = [p]
+    lst.append(lst)   # creates a circular reference
+    with capture:
+        del p, lst
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == """
+        Releasing parent.
+        Releasing child.
+    """
+
+
+def test_alive_gc_multi_derived(capture):
+    class Derived(m.Parent, m.Child):
+        def __init__(self):
+            m.Parent.__init__(self)
+            m.Child.__init__(self)
+
+    n_inst = ConstructorStats.detail_reg_inst()
+    p = Derived()
+    p.addChildKeepAlive(m.Child())
+    # +3 rather than +2 because Derived corresponds to two registered instances
+    assert ConstructorStats.detail_reg_inst() == n_inst + 3
+    lst = [p]
+    lst.append(lst)   # creates a circular reference
+    with capture:
+        del p, lst
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == """
+        Releasing parent.
+        Releasing child.
+        Releasing child.
+    """
+
+
+def test_return_none(capture):
+    n_inst = ConstructorStats.detail_reg_inst()
+    with capture:
+        p = m.Parent()
+    assert capture == "Allocating parent."
+    with capture:
+        p.returnNullChildKeepAliveChild()
+        assert ConstructorStats.detail_reg_inst() == n_inst + 1
+    assert capture == ""
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == "Releasing parent."
+
+    with capture:
+        p = m.Parent()
+    assert capture == "Allocating parent."
+    with capture:
+        p.returnNullChildKeepAliveParent()
+        assert ConstructorStats.detail_reg_inst() == n_inst + 1
+    assert capture == ""
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == "Releasing parent."
+
+
+def test_keep_alive_constructor(capture):
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    with capture:
+        p = m.Parent(m.Child())
+        assert ConstructorStats.detail_reg_inst() == n_inst + 2
+    assert capture == """
+        Allocating child.
+        Allocating parent.
+    """
+    with capture:
+        del p
+        assert ConstructorStats.detail_reg_inst() == n_inst
+    assert capture == """
+        Releasing parent.
+        Releasing child.
+    """
+
+
+def test_call_guard():
+    assert m.unguarded_call() == "unguarded"
+    assert m.guarded_call() == "guarded"
+
+    assert m.multiple_guards_correct_order() == "guarded & guarded"
+    assert m.multiple_guards_wrong_order() == "unguarded & guarded"
+
+    if hasattr(m, "with_gil"):
+        assert m.with_gil() == "GIL held"
+        assert m.without_gil() == "GIL released"
diff --git a/3rdparty/pybind11/tests/test_callbacks.cpp b/3rdparty/pybind11/tests/test_callbacks.cpp
new file mode 100644
index 00000000..71b88c44
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_callbacks.cpp
@@ -0,0 +1,168 @@
+/*
+    tests/test_callbacks.cpp -- callbacks
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/functional.h>
+#include <thread>
+
+
+int dummy_function(int i) { return i + 1; }
+
+TEST_SUBMODULE(callbacks, m) {
+    // test_callbacks, test_function_signatures
+    m.def("test_callback1", [](py::object func) { return func(); });
+    m.def("test_callback2", [](py::object func) { return func("Hello", 'x', true, 5); });
+    m.def("test_callback3", [](const std::function<int(int)> &func) {
+        return "func(43) = " + std::to_string(func(43)); });
+    m.def("test_callback4", []() -> std::function<int(int)> { return [](int i) { return i+1; }; });
+    m.def("test_callback5", []() {
+        return py::cpp_function([](int i) { return i+1; }, py::arg("number"));
+    });
+
+    // test_keyword_args_and_generalized_unpacking
+    m.def("test_tuple_unpacking", [](py::function f) {
+        auto t1 = py::make_tuple(2, 3);
+        auto t2 = py::make_tuple(5, 6);
+        return f("positional", 1, *t1, 4, *t2);
+    });
+
+    m.def("test_dict_unpacking", [](py::function f) {
+        auto d1 = py::dict("key"_a="value", "a"_a=1);
+        auto d2 = py::dict();
+        auto d3 = py::dict("b"_a=2);
+        return f("positional", 1, **d1, **d2, **d3);
+    });
+
+    m.def("test_keyword_args", [](py::function f) {
+        return f("x"_a=10, "y"_a=20);
+    });
+
+    m.def("test_unpacking_and_keywords1", [](py::function f) {
+        auto args = py::make_tuple(2);
+        auto kwargs = py::dict("d"_a=4);
+        return f(1, *args, "c"_a=3, **kwargs);
+    });
+
+    m.def("test_unpacking_and_keywords2", [](py::function f) {
+        auto kwargs1 = py::dict("a"_a=1);
+        auto kwargs2 = py::dict("c"_a=3, "d"_a=4);
+        return f("positional", *py::make_tuple(1), 2, *py::make_tuple(3, 4), 5,
+                 "key"_a="value", **kwargs1, "b"_a=2, **kwargs2, "e"_a=5);
+    });
+
+    m.def("test_unpacking_error1", [](py::function f) {
+        auto kwargs = py::dict("x"_a=3);
+        return f("x"_a=1, "y"_a=2, **kwargs); // duplicate ** after keyword
+    });
+
+    m.def("test_unpacking_error2", [](py::function f) {
+        auto kwargs = py::dict("x"_a=3);
+        return f(**kwargs, "x"_a=1); // duplicate keyword after **
+    });
+
+    m.def("test_arg_conversion_error1", [](py::function f) {
+        f(234, UnregisteredType(), "kw"_a=567);
+    });
+
+    m.def("test_arg_conversion_error2", [](py::function f) {
+        f(234, "expected_name"_a=UnregisteredType(), "kw"_a=567);
+    });
+
+    // test_lambda_closure_cleanup
+    struct Payload {
+        Payload() { print_default_created(this); }
+        ~Payload() { print_destroyed(this); }
+        Payload(const Payload &) { print_copy_created(this); }
+        Payload(Payload &&) { print_move_created(this); }
+    };
+    // Export the payload constructor statistics for testing purposes:
+    m.def("payload_cstats", &ConstructorStats::get<Payload>);
+    /* Test cleanup of lambda closure */
+    m.def("test_cleanup", []() -> std::function<void(void)> {
+        Payload p;
+
+        return [p]() {
+            /* p should be cleaned up when the returned function is garbage collected */
+            (void) p;
+        };
+    });
+
+    // test_cpp_function_roundtrip
+    /* Test if passing a function pointer from C++ -> Python -> C++ yields the original pointer */
+    m.def("dummy_function", &dummy_function);
+    m.def("dummy_function2", [](int i, int j) { return i + j; });
+    m.def("roundtrip", [](std::function<int(int)> f, bool expect_none = false) {
+        if (expect_none && f)
+            throw std::runtime_error("Expected None to be converted to empty std::function");
+        return f;
+    }, py::arg("f"), py::arg("expect_none")=false);
+    m.def("test_dummy_function", [](const std::function<int(int)> &f) -> std::string {
+        using fn_type = int (*)(int);
+        auto result = f.target<fn_type>();
+        if (!result) {
+            auto r = f(1);
+            return "can't convert to function pointer: eval(1) = " + std::to_string(r);
+        } else if (*result == dummy_function) {
+            auto r = (*result)(1);
+            return "matches dummy_function: eval(1) = " + std::to_string(r);
+        } else {
+            return "argument does NOT match dummy_function. This should never happen!";
+        }
+    });
+
+    class AbstractBase { public: virtual unsigned int func() = 0; };
+    m.def("func_accepting_func_accepting_base", [](std::function<double(AbstractBase&)>) { });
+
+    struct MovableObject {
+        bool valid = true;
+
+        MovableObject() = default;
+        MovableObject(const MovableObject &) = default;
+        MovableObject &operator=(const MovableObject &) = default;
+        MovableObject(MovableObject &&o) : valid(o.valid) { o.valid = false; }
+        MovableObject &operator=(MovableObject &&o) {
+            valid = o.valid;
+            o.valid = false;
+            return *this;
+        }
+    };
+    py::class_<MovableObject>(m, "MovableObject");
+
+    // test_movable_object
+    m.def("callback_with_movable", [](std::function<void(MovableObject &)> f) {
+        auto x = MovableObject();
+        f(x); // lvalue reference shouldn't move out object
+        return x.valid; // must still return `true`
+    });
+
+    // test_bound_method_callback
+    struct CppBoundMethodTest {};
+    py::class_<CppBoundMethodTest>(m, "CppBoundMethodTest")
+        .def(py::init<>())
+        .def("triple", [](CppBoundMethodTest &, int val) { return 3 * val; });
+
+    // test async Python callbacks
+    using callback_f = std::function<void(int)>;
+    m.def("test_async_callback", [](callback_f f, py::list work) {
+        // make detached thread that calls `f` with piece of work after a little delay
+        auto start_f = [f](int j) {
+            auto invoke_f = [f, j] {
+                std::this_thread::sleep_for(std::chrono::milliseconds(50));
+                f(j);
+            };
+            auto t = std::thread(std::move(invoke_f));
+            t.detach();
+        };
+
+        // spawn worker threads
+        for (auto i : work)
+            start_f(py::cast<int>(i));
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_callbacks.py b/3rdparty/pybind11/tests/test_callbacks.py
new file mode 100644
index 00000000..6439c8e7
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_callbacks.py
@@ -0,0 +1,136 @@
+import pytest
+from pybind11_tests import callbacks as m
+from threading import Thread
+
+
+def test_callbacks():
+    from functools import partial
+
+    def func1():
+        return "func1"
+
+    def func2(a, b, c, d):
+        return "func2", a, b, c, d
+
+    def func3(a):
+        return "func3({})".format(a)
+
+    assert m.test_callback1(func1) == "func1"
+    assert m.test_callback2(func2) == ("func2", "Hello", "x", True, 5)
+    assert m.test_callback1(partial(func2, 1, 2, 3, 4)) == ("func2", 1, 2, 3, 4)
+    assert m.test_callback1(partial(func3, "partial")) == "func3(partial)"
+    assert m.test_callback3(lambda i: i + 1) == "func(43) = 44"
+
+    f = m.test_callback4()
+    assert f(43) == 44
+    f = m.test_callback5()
+    assert f(number=43) == 44
+
+
+def test_bound_method_callback():
+    # Bound Python method:
+    class MyClass:
+        def double(self, val):
+            return 2 * val
+
+    z = MyClass()
+    assert m.test_callback3(z.double) == "func(43) = 86"
+
+    z = m.CppBoundMethodTest()
+    assert m.test_callback3(z.triple) == "func(43) = 129"
+
+
+def test_keyword_args_and_generalized_unpacking():
+
+    def f(*args, **kwargs):
+        return args, kwargs
+
+    assert m.test_tuple_unpacking(f) == (("positional", 1, 2, 3, 4, 5, 6), {})
+    assert m.test_dict_unpacking(f) == (("positional", 1), {"key": "value", "a": 1, "b": 2})
+    assert m.test_keyword_args(f) == ((), {"x": 10, "y": 20})
+    assert m.test_unpacking_and_keywords1(f) == ((1, 2), {"c": 3, "d": 4})
+    assert m.test_unpacking_and_keywords2(f) == (
+        ("positional", 1, 2, 3, 4, 5),
+        {"key": "value", "a": 1, "b": 2, "c": 3, "d": 4, "e": 5}
+    )
+
+    with pytest.raises(TypeError) as excinfo:
+        m.test_unpacking_error1(f)
+    assert "Got multiple values for keyword argument" in str(excinfo.value)
+
+    with pytest.raises(TypeError) as excinfo:
+        m.test_unpacking_error2(f)
+    assert "Got multiple values for keyword argument" in str(excinfo.value)
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.test_arg_conversion_error1(f)
+    assert "Unable to convert call argument" in str(excinfo.value)
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.test_arg_conversion_error2(f)
+    assert "Unable to convert call argument" in str(excinfo.value)
+
+
+def test_lambda_closure_cleanup():
+    m.test_cleanup()
+    cstats = m.payload_cstats()
+    assert cstats.alive() == 0
+    assert cstats.copy_constructions == 1
+    assert cstats.move_constructions >= 1
+
+
+def test_cpp_function_roundtrip():
+    """Test if passing a function pointer from C++ -> Python -> C++ yields the original pointer"""
+
+    assert m.test_dummy_function(m.dummy_function) == "matches dummy_function: eval(1) = 2"
+    assert (m.test_dummy_function(m.roundtrip(m.dummy_function)) ==
+            "matches dummy_function: eval(1) = 2")
+    assert m.roundtrip(None, expect_none=True) is None
+    assert (m.test_dummy_function(lambda x: x + 2) ==
+            "can't convert to function pointer: eval(1) = 3")
+
+    with pytest.raises(TypeError) as excinfo:
+        m.test_dummy_function(m.dummy_function2)
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    with pytest.raises(TypeError) as excinfo:
+        m.test_dummy_function(lambda x, y: x + y)
+    assert any(s in str(excinfo.value) for s in ("missing 1 required positional argument",
+                                                 "takes exactly 2 arguments"))
+
+
+def test_function_signatures(doc):
+    assert doc(m.test_callback3) == "test_callback3(arg0: Callable[[int], int]) -> str"
+    assert doc(m.test_callback4) == "test_callback4() -> Callable[[int], int]"
+
+
+def test_movable_object():
+    assert m.callback_with_movable(lambda _: None) is True
+
+
+def test_async_callbacks():
+    # serves as state for async callback
+    class Item:
+        def __init__(self, value):
+            self.value = value
+
+    res = []
+
+    # generate stateful lambda that will store result in `res`
+    def gen_f():
+        s = Item(3)
+        return lambda j: res.append(s.value + j)
+
+    # do some work async
+    work = [1, 2, 3, 4]
+    m.test_async_callback(gen_f(), work)
+    # wait until work is done
+    from time import sleep
+    sleep(0.5)
+    assert sum(res) == sum([x + 3 for x in work])
+
+
+def test_async_async_callbacks():
+    t = Thread(target=test_async_callbacks)
+    t.start()
+    t.join()
diff --git a/3rdparty/pybind11/tests/test_chrono.cpp b/3rdparty/pybind11/tests/test_chrono.cpp
new file mode 100644
index 00000000..899d08d8
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_chrono.cpp
@@ -0,0 +1,55 @@
+/*
+    tests/test_chrono.cpp -- test conversions to/from std::chrono types
+
+    Copyright (c) 2016 Trent Houliston <trent@houliston.me> and
+                       Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/chrono.h>
+
+TEST_SUBMODULE(chrono, m) {
+    using system_time = std::chrono::system_clock::time_point;
+    using steady_time = std::chrono::steady_clock::time_point;
+
+    using timespan = std::chrono::duration<int64_t, std::nano>;
+    using timestamp = std::chrono::time_point<std::chrono::system_clock, timespan>;
+
+    // test_chrono_system_clock
+    // Return the current time off the wall clock
+    m.def("test_chrono1", []() { return std::chrono::system_clock::now(); });
+
+    // test_chrono_system_clock_roundtrip
+    // Round trip the passed in system clock time
+    m.def("test_chrono2", [](system_time t) { return t; });
+
+    // test_chrono_duration_roundtrip
+    // Round trip the passed in duration
+    m.def("test_chrono3", [](std::chrono::system_clock::duration d) { return d; });
+
+    // test_chrono_duration_subtraction_equivalence
+    // Difference between two passed in time_points
+    m.def("test_chrono4", [](system_time a, system_time b) { return a - b; });
+
+    // test_chrono_steady_clock
+    // Return the current time off the steady_clock
+    m.def("test_chrono5", []() { return std::chrono::steady_clock::now(); });
+
+    // test_chrono_steady_clock_roundtrip
+    // Round trip a steady clock timepoint
+    m.def("test_chrono6", [](steady_time t) { return t; });
+
+    // test_floating_point_duration
+    // Roundtrip a duration in microseconds from a float argument
+    m.def("test_chrono7", [](std::chrono::microseconds t) { return t; });
+    // Float durations (issue #719)
+    m.def("test_chrono_float_diff", [](std::chrono::duration<float> a, std::chrono::duration<float> b) {
+        return a - b; });
+
+    m.def("test_nano_timepoint", [](timestamp start, timespan delta) -> timestamp {
+        return start + delta;
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_chrono.py b/3rdparty/pybind11/tests/test_chrono.py
new file mode 100644
index 00000000..55c95440
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_chrono.py
@@ -0,0 +1,176 @@
+from pybind11_tests import chrono as m
+import datetime
+
+
+def test_chrono_system_clock():
+
+    # Get the time from both c++ and datetime
+    date1 = m.test_chrono1()
+    date2 = datetime.datetime.today()
+
+    # The returned value should be a datetime
+    assert isinstance(date1, datetime.datetime)
+
+    # The numbers should vary by a very small amount (time it took to execute)
+    diff = abs(date1 - date2)
+
+    # There should never be a days/seconds difference
+    assert diff.days == 0
+    assert diff.seconds == 0
+
+    # We test that no more than about 0.5 seconds passes here
+    # This makes sure that the dates created are very close to the same
+    # but if the testing system is incredibly overloaded this should still pass
+    assert diff.microseconds < 500000
+
+
+def test_chrono_system_clock_roundtrip():
+    date1 = datetime.datetime.today()
+
+    # Roundtrip the time
+    date2 = m.test_chrono2(date1)
+
+    # The returned value should be a datetime
+    assert isinstance(date2, datetime.datetime)
+
+    # They should be identical (no information lost on roundtrip)
+    diff = abs(date1 - date2)
+    assert diff.days == 0
+    assert diff.seconds == 0
+    assert diff.microseconds == 0
+
+
+def test_chrono_system_clock_roundtrip_date():
+    date1 = datetime.date.today()
+
+    # Roundtrip the time
+    datetime2 = m.test_chrono2(date1)
+    date2 = datetime2.date()
+    time2 = datetime2.time()
+
+    # The returned value should be a datetime
+    assert isinstance(datetime2, datetime.datetime)
+    assert isinstance(date2, datetime.date)
+    assert isinstance(time2, datetime.time)
+
+    # They should be identical (no information lost on roundtrip)
+    diff = abs(date1 - date2)
+    assert diff.days == 0
+    assert diff.seconds == 0
+    assert diff.microseconds == 0
+
+    # Year, Month & Day should be the same after the round trip
+    assert date1.year == date2.year
+    assert date1.month == date2.month
+    assert date1.day == date2.day
+
+    # There should be no time information
+    assert time2.hour == 0
+    assert time2.minute == 0
+    assert time2.second == 0
+    assert time2.microsecond == 0
+
+
+def test_chrono_system_clock_roundtrip_time():
+    time1 = datetime.datetime.today().time()
+
+    # Roundtrip the time
+    datetime2 = m.test_chrono2(time1)
+    date2 = datetime2.date()
+    time2 = datetime2.time()
+
+    # The returned value should be a datetime
+    assert isinstance(datetime2, datetime.datetime)
+    assert isinstance(date2, datetime.date)
+    assert isinstance(time2, datetime.time)
+
+    # Hour, Minute, Second & Microsecond should be the same after the round trip
+    assert time1.hour == time2.hour
+    assert time1.minute == time2.minute
+    assert time1.second == time2.second
+    assert time1.microsecond == time2.microsecond
+
+    # There should be no date information (i.e. date = python base date)
+    assert date2.year == 1970
+    assert date2.month == 1
+    assert date2.day == 1
+
+
+def test_chrono_duration_roundtrip():
+
+    # Get the difference between two times (a timedelta)
+    date1 = datetime.datetime.today()
+    date2 = datetime.datetime.today()
+    diff = date2 - date1
+
+    # Make sure this is a timedelta
+    assert isinstance(diff, datetime.timedelta)
+
+    cpp_diff = m.test_chrono3(diff)
+
+    assert cpp_diff.days == diff.days
+    assert cpp_diff.seconds == diff.seconds
+    assert cpp_diff.microseconds == diff.microseconds
+
+
+def test_chrono_duration_subtraction_equivalence():
+
+    date1 = datetime.datetime.today()
+    date2 = datetime.datetime.today()
+
+    diff = date2 - date1
+    cpp_diff = m.test_chrono4(date2, date1)
+
+    assert cpp_diff.days == diff.days
+    assert cpp_diff.seconds == diff.seconds
+    assert cpp_diff.microseconds == diff.microseconds
+
+
+def test_chrono_duration_subtraction_equivalence_date():
+
+    date1 = datetime.date.today()
+    date2 = datetime.date.today()
+
+    diff = date2 - date1
+    cpp_diff = m.test_chrono4(date2, date1)
+
+    assert cpp_diff.days == diff.days
+    assert cpp_diff.seconds == diff.seconds
+    assert cpp_diff.microseconds == diff.microseconds
+
+
+def test_chrono_steady_clock():
+    time1 = m.test_chrono5()
+    assert isinstance(time1, datetime.timedelta)
+
+
+def test_chrono_steady_clock_roundtrip():
+    time1 = datetime.timedelta(days=10, seconds=10, microseconds=100)
+    time2 = m.test_chrono6(time1)
+
+    assert isinstance(time2, datetime.timedelta)
+
+    # They should be identical (no information lost on roundtrip)
+    assert time1.days == time2.days
+    assert time1.seconds == time2.seconds
+    assert time1.microseconds == time2.microseconds
+
+
+def test_floating_point_duration():
+    # Test using a floating point number in seconds
+    time = m.test_chrono7(35.525123)
+
+    assert isinstance(time, datetime.timedelta)
+
+    assert time.seconds == 35
+    assert 525122 <= time.microseconds <= 525123
+
+    diff = m.test_chrono_float_diff(43.789012, 1.123456)
+    assert diff.seconds == 42
+    assert 665556 <= diff.microseconds <= 665557
+
+
+def test_nano_timepoint():
+    time = datetime.datetime.now()
+    time1 = m.test_nano_timepoint(time, datetime.timedelta(seconds=60))
+    assert(time1 == time + datetime.timedelta(seconds=60))
diff --git a/3rdparty/pybind11/tests/test_class.cpp b/3rdparty/pybind11/tests/test_class.cpp
new file mode 100644
index 00000000..499d0cc5
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_class.cpp
@@ -0,0 +1,422 @@
+/*
+    tests/test_class.cpp -- test py::class_ definitions and basic functionality
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include "local_bindings.h"
+#include <pybind11/stl.h>
+
+#if defined(_MSC_VER)
+#  pragma warning(disable: 4324) // warning C4324: structure was padded due to alignment specifier
+#endif
+
+// test_brace_initialization
+struct NoBraceInitialization {
+    NoBraceInitialization(std::vector<int> v) : vec{std::move(v)} {}
+    template <typename T>
+    NoBraceInitialization(std::initializer_list<T> l) : vec(l) {}
+
+    std::vector<int> vec;
+};
+
+TEST_SUBMODULE(class_, m) {
+    // test_instance
+    struct NoConstructor {
+        NoConstructor() = default;
+        NoConstructor(const NoConstructor &) = default;
+        NoConstructor(NoConstructor &&) = default;
+        static NoConstructor *new_instance() {
+            auto *ptr = new NoConstructor();
+            print_created(ptr, "via new_instance");
+            return ptr;
+        }
+        ~NoConstructor() { print_destroyed(this); }
+    };
+
+    py::class_<NoConstructor>(m, "NoConstructor")
+        .def_static("new_instance", &NoConstructor::new_instance, "Return an instance");
+
+    // test_inheritance
+    class Pet {
+    public:
+        Pet(const std::string &name, const std::string &species)
+            : m_name(name), m_species(species) {}
+        std::string name() const { return m_name; }
+        std::string species() const { return m_species; }
+    private:
+        std::string m_name;
+        std::string m_species;
+    };
+
+    class Dog : public Pet {
+    public:
+        Dog(const std::string &name) : Pet(name, "dog") {}
+        std::string bark() const { return "Woof!"; }
+    };
+
+    class Rabbit : public Pet {
+    public:
+        Rabbit(const std::string &name) : Pet(name, "parrot") {}
+    };
+
+    class Hamster : public Pet {
+    public:
+        Hamster(const std::string &name) : Pet(name, "rodent") {}
+    };
+
+    class Chimera : public Pet {
+        Chimera() : Pet("Kimmy", "chimera") {}
+    };
+
+    py::class_<Pet> pet_class(m, "Pet");
+    pet_class
+        .def(py::init<std::string, std::string>())
+        .def("name", &Pet::name)
+        .def("species", &Pet::species);
+
+    /* One way of declaring a subclass relationship: reference parent's class_ object */
+    py::class_<Dog>(m, "Dog", pet_class)
+        .def(py::init<std::string>());
+
+    /* Another way of declaring a subclass relationship: reference parent's C++ type */
+    py::class_<Rabbit, Pet>(m, "Rabbit")
+        .def(py::init<std::string>());
+
+    /* And another: list parent in class template arguments */
+    py::class_<Hamster, Pet>(m, "Hamster")
+        .def(py::init<std::string>());
+
+    /* Constructors are not inherited by default */
+    py::class_<Chimera, Pet>(m, "Chimera");
+
+    m.def("pet_name_species", [](const Pet &pet) { return pet.name() + " is a " + pet.species(); });
+    m.def("dog_bark", [](const Dog &dog) { return dog.bark(); });
+
+    // test_automatic_upcasting
+    struct BaseClass {
+        BaseClass() = default;
+        BaseClass(const BaseClass &) = default;
+        BaseClass(BaseClass &&) = default;
+        virtual ~BaseClass() {}
+    };
+    struct DerivedClass1 : BaseClass { };
+    struct DerivedClass2 : BaseClass { };
+
+    py::class_<BaseClass>(m, "BaseClass").def(py::init<>());
+    py::class_<DerivedClass1>(m, "DerivedClass1").def(py::init<>());
+    py::class_<DerivedClass2>(m, "DerivedClass2").def(py::init<>());
+
+    m.def("return_class_1", []() -> BaseClass* { return new DerivedClass1(); });
+    m.def("return_class_2", []() -> BaseClass* { return new DerivedClass2(); });
+    m.def("return_class_n", [](int n) -> BaseClass* {
+        if (n == 1) return new DerivedClass1();
+        if (n == 2) return new DerivedClass2();
+        return new BaseClass();
+    });
+    m.def("return_none", []() -> BaseClass* { return nullptr; });
+
+    // test_isinstance
+    m.def("check_instances", [](py::list l) {
+        return py::make_tuple(
+            py::isinstance<py::tuple>(l[0]),
+            py::isinstance<py::dict>(l[1]),
+            py::isinstance<Pet>(l[2]),
+            py::isinstance<Pet>(l[3]),
+            py::isinstance<Dog>(l[4]),
+            py::isinstance<Rabbit>(l[5]),
+            py::isinstance<UnregisteredType>(l[6])
+        );
+    });
+
+    // test_mismatched_holder
+    struct MismatchBase1 { };
+    struct MismatchDerived1 : MismatchBase1 { };
+
+    struct MismatchBase2 { };
+    struct MismatchDerived2 : MismatchBase2 { };
+
+    m.def("mismatched_holder_1", []() {
+        auto mod = py::module::import("__main__");
+        py::class_<MismatchBase1, std::shared_ptr<MismatchBase1>>(mod, "MismatchBase1");
+        py::class_<MismatchDerived1, MismatchBase1>(mod, "MismatchDerived1");
+    });
+    m.def("mismatched_holder_2", []() {
+        auto mod = py::module::import("__main__");
+        py::class_<MismatchBase2>(mod, "MismatchBase2");
+        py::class_<MismatchDerived2, std::shared_ptr<MismatchDerived2>,
+                   MismatchBase2>(mod, "MismatchDerived2");
+    });
+
+    // test_override_static
+    // #511: problem with inheritance + overwritten def_static
+    struct MyBase {
+        static std::unique_ptr<MyBase> make() {
+            return std::unique_ptr<MyBase>(new MyBase());
+        }
+    };
+
+    struct MyDerived : MyBase {
+        static std::unique_ptr<MyDerived> make() {
+            return std::unique_ptr<MyDerived>(new MyDerived());
+        }
+    };
+
+    py::class_<MyBase>(m, "MyBase")
+        .def_static("make", &MyBase::make);
+
+    py::class_<MyDerived, MyBase>(m, "MyDerived")
+        .def_static("make", &MyDerived::make)
+        .def_static("make2", &MyDerived::make);
+
+    // test_implicit_conversion_life_support
+    struct ConvertibleFromUserType {
+        int i;
+
+        ConvertibleFromUserType(UserType u) : i(u.value()) { }
+    };
+
+    py::class_<ConvertibleFromUserType>(m, "AcceptsUserType")
+        .def(py::init<UserType>());
+    py::implicitly_convertible<UserType, ConvertibleFromUserType>();
+
+    m.def("implicitly_convert_argument", [](const ConvertibleFromUserType &r) { return r.i; });
+    m.def("implicitly_convert_variable", [](py::object o) {
+        // `o` is `UserType` and `r` is a reference to a temporary created by implicit
+        // conversion. This is valid when called inside a bound function because the temp
+        // object is attached to the same life support system as the arguments.
+        const auto &r = o.cast<const ConvertibleFromUserType &>();
+        return r.i;
+    });
+    m.add_object("implicitly_convert_variable_fail", [&] {
+        auto f = [](PyObject *, PyObject *args) -> PyObject * {
+            auto o = py::reinterpret_borrow<py::tuple>(args)[0];
+            try { // It should fail here because there is no life support.
+                o.cast<const ConvertibleFromUserType &>();
+            } catch (const py::cast_error &e) {
+                return py::str(e.what()).release().ptr();
+            }
+            return py::str().release().ptr();
+        };
+
+        auto def = new PyMethodDef{"f", f, METH_VARARGS, nullptr};
+        return py::reinterpret_steal<py::object>(PyCFunction_NewEx(def, nullptr, m.ptr()));
+    }());
+
+    // test_operator_new_delete
+    struct HasOpNewDel {
+        std::uint64_t i;
+        static void *operator new(size_t s) { py::print("A new", s); return ::operator new(s); }
+        static void *operator new(size_t s, void *ptr) { py::print("A placement-new", s); return ptr; }
+        static void operator delete(void *p) { py::print("A delete"); return ::operator delete(p); }
+    };
+    struct HasOpNewDelSize {
+        std::uint32_t i;
+        static void *operator new(size_t s) { py::print("B new", s); return ::operator new(s); }
+        static void *operator new(size_t s, void *ptr) { py::print("B placement-new", s); return ptr; }
+        static void operator delete(void *p, size_t s) { py::print("B delete", s); return ::operator delete(p); }
+    };
+    struct AliasedHasOpNewDelSize {
+        std::uint64_t i;
+        static void *operator new(size_t s) { py::print("C new", s); return ::operator new(s); }
+        static void *operator new(size_t s, void *ptr) { py::print("C placement-new", s); return ptr; }
+        static void operator delete(void *p, size_t s) { py::print("C delete", s); return ::operator delete(p); }
+        virtual ~AliasedHasOpNewDelSize() = default;
+    };
+    struct PyAliasedHasOpNewDelSize : AliasedHasOpNewDelSize {
+        PyAliasedHasOpNewDelSize() = default;
+        PyAliasedHasOpNewDelSize(int) { }
+        std::uint64_t j;
+    };
+    struct HasOpNewDelBoth {
+        std::uint32_t i[8];
+        static void *operator new(size_t s) { py::print("D new", s); return ::operator new(s); }
+        static void *operator new(size_t s, void *ptr) { py::print("D placement-new", s); return ptr; }
+        static void operator delete(void *p) { py::print("D delete"); return ::operator delete(p); }
+        static void operator delete(void *p, size_t s) { py::print("D wrong delete", s); return ::operator delete(p); }
+    };
+    py::class_<HasOpNewDel>(m, "HasOpNewDel").def(py::init<>());
+    py::class_<HasOpNewDelSize>(m, "HasOpNewDelSize").def(py::init<>());
+    py::class_<HasOpNewDelBoth>(m, "HasOpNewDelBoth").def(py::init<>());
+    py::class_<AliasedHasOpNewDelSize, PyAliasedHasOpNewDelSize> aliased(m, "AliasedHasOpNewDelSize");
+    aliased.def(py::init<>());
+    aliased.attr("size_noalias") = py::int_(sizeof(AliasedHasOpNewDelSize));
+    aliased.attr("size_alias") = py::int_(sizeof(PyAliasedHasOpNewDelSize));
+
+    // This test is actually part of test_local_bindings (test_duplicate_local), but we need a
+    // definition in a different compilation unit within the same module:
+    bind_local<LocalExternal, 17>(m, "LocalExternal", py::module_local());
+
+    // test_bind_protected_functions
+    class ProtectedA {
+    protected:
+        int foo() const { return value; }
+
+    private:
+        int value = 42;
+    };
+
+    class PublicistA : public ProtectedA {
+    public:
+        using ProtectedA::foo;
+    };
+
+    py::class_<ProtectedA>(m, "ProtectedA")
+        .def(py::init<>())
+#if !defined(_MSC_VER) || _MSC_VER >= 1910
+        .def("foo", &PublicistA::foo);
+#else
+        .def("foo", static_cast<int (ProtectedA::*)() const>(&PublicistA::foo));
+#endif
+
+    class ProtectedB {
+    public:
+        virtual ~ProtectedB() = default;
+
+    protected:
+        virtual int foo() const { return value; }
+
+    private:
+        int value = 42;
+    };
+
+    class TrampolineB : public ProtectedB {
+    public:
+        int foo() const override { PYBIND11_OVERLOAD(int, ProtectedB, foo, ); }
+    };
+
+    class PublicistB : public ProtectedB {
+    public:
+        using ProtectedB::foo;
+    };
+
+    py::class_<ProtectedB, TrampolineB>(m, "ProtectedB")
+        .def(py::init<>())
+#if !defined(_MSC_VER) || _MSC_VER >= 1910
+        .def("foo", &PublicistB::foo);
+#else
+        .def("foo", static_cast<int (ProtectedB::*)() const>(&PublicistB::foo));
+#endif
+
+    // test_brace_initialization
+    struct BraceInitialization {
+        int field1;
+        std::string field2;
+    };
+
+    py::class_<BraceInitialization>(m, "BraceInitialization")
+        .def(py::init<int, const std::string &>())
+        .def_readwrite("field1", &BraceInitialization::field1)
+        .def_readwrite("field2", &BraceInitialization::field2);
+    // We *don't* want to construct using braces when the given constructor argument maps to a
+    // constructor, because brace initialization could go to the wrong place (in particular when
+    // there is also an `initializer_list<T>`-accept constructor):
+    py::class_<NoBraceInitialization>(m, "NoBraceInitialization")
+        .def(py::init<std::vector<int>>())
+        .def_readonly("vec", &NoBraceInitialization::vec);
+
+    // test_reentrant_implicit_conversion_failure
+    // #1035: issue with runaway reentrant implicit conversion
+    struct BogusImplicitConversion {
+        BogusImplicitConversion(const BogusImplicitConversion &) { }
+    };
+
+    py::class_<BogusImplicitConversion>(m, "BogusImplicitConversion")
+        .def(py::init<const BogusImplicitConversion &>());
+
+    py::implicitly_convertible<int, BogusImplicitConversion>();
+
+    // test_qualname
+    // #1166: nested class docstring doesn't show nested name
+    // Also related: tests that __qualname__ is set properly
+    struct NestBase {};
+    struct Nested {};
+    py::class_<NestBase> base(m, "NestBase");
+    base.def(py::init<>());
+    py::class_<Nested>(base, "Nested")
+        .def(py::init<>())
+        .def("fn", [](Nested &, int, NestBase &, Nested &) {})
+        .def("fa", [](Nested &, int, NestBase &, Nested &) {},
+                "a"_a, "b"_a, "c"_a);
+    base.def("g", [](NestBase &, Nested &) {});
+    base.def("h", []() { return NestBase(); });
+
+    // test_error_after_conversion
+    // The second-pass path through dispatcher() previously didn't
+    // remember which overload was used, and would crash trying to
+    // generate a useful error message
+
+    struct NotRegistered {};
+    struct StringWrapper { std::string str; };
+    m.def("test_error_after_conversions", [](int) {});
+    m.def("test_error_after_conversions",
+          [](StringWrapper) -> NotRegistered { return {}; });
+    py::class_<StringWrapper>(m, "StringWrapper").def(py::init<std::string>());
+    py::implicitly_convertible<std::string, StringWrapper>();
+
+    #if defined(PYBIND11_CPP17)
+        struct alignas(1024) Aligned {
+            std::uintptr_t ptr() const { return (uintptr_t) this; }
+        };
+        py::class_<Aligned>(m, "Aligned")
+            .def(py::init<>())
+            .def("ptr", &Aligned::ptr);
+    #endif
+}
+
+template <int N> class BreaksBase { public: virtual ~BreaksBase() = default; };
+template <int N> class BreaksTramp : public BreaksBase<N> {};
+// These should all compile just fine:
+typedef py::class_<BreaksBase<1>, std::unique_ptr<BreaksBase<1>>, BreaksTramp<1>> DoesntBreak1;
+typedef py::class_<BreaksBase<2>, BreaksTramp<2>, std::unique_ptr<BreaksBase<2>>> DoesntBreak2;
+typedef py::class_<BreaksBase<3>, std::unique_ptr<BreaksBase<3>>> DoesntBreak3;
+typedef py::class_<BreaksBase<4>, BreaksTramp<4>> DoesntBreak4;
+typedef py::class_<BreaksBase<5>> DoesntBreak5;
+typedef py::class_<BreaksBase<6>, std::shared_ptr<BreaksBase<6>>, BreaksTramp<6>> DoesntBreak6;
+typedef py::class_<BreaksBase<7>, BreaksTramp<7>, std::shared_ptr<BreaksBase<7>>> DoesntBreak7;
+typedef py::class_<BreaksBase<8>, std::shared_ptr<BreaksBase<8>>> DoesntBreak8;
+#define CHECK_BASE(N) static_assert(std::is_same<typename DoesntBreak##N::type, BreaksBase<N>>::value, \
+        "DoesntBreak" #N " has wrong type!")
+CHECK_BASE(1); CHECK_BASE(2); CHECK_BASE(3); CHECK_BASE(4); CHECK_BASE(5); CHECK_BASE(6); CHECK_BASE(7); CHECK_BASE(8);
+#define CHECK_ALIAS(N) static_assert(DoesntBreak##N::has_alias && std::is_same<typename DoesntBreak##N::type_alias, BreaksTramp<N>>::value, \
+        "DoesntBreak" #N " has wrong type_alias!")
+#define CHECK_NOALIAS(N) static_assert(!DoesntBreak##N::has_alias && std::is_void<typename DoesntBreak##N::type_alias>::value, \
+        "DoesntBreak" #N " has type alias, but shouldn't!")
+CHECK_ALIAS(1); CHECK_ALIAS(2); CHECK_NOALIAS(3); CHECK_ALIAS(4); CHECK_NOALIAS(5); CHECK_ALIAS(6); CHECK_ALIAS(7); CHECK_NOALIAS(8);
+#define CHECK_HOLDER(N, TYPE) static_assert(std::is_same<typename DoesntBreak##N::holder_type, std::TYPE##_ptr<BreaksBase<N>>>::value, \
+        "DoesntBreak" #N " has wrong holder_type!")
+CHECK_HOLDER(1, unique); CHECK_HOLDER(2, unique); CHECK_HOLDER(3, unique); CHECK_HOLDER(4, unique); CHECK_HOLDER(5, unique);
+CHECK_HOLDER(6, shared); CHECK_HOLDER(7, shared); CHECK_HOLDER(8, shared);
+
+// There's no nice way to test that these fail because they fail to compile; leave them here,
+// though, so that they can be manually tested by uncommenting them (and seeing that compilation
+// failures occurs).
+
+// We have to actually look into the type: the typedef alone isn't enough to instantiate the type:
+#define CHECK_BROKEN(N) static_assert(std::is_same<typename Breaks##N::type, BreaksBase<-N>>::value, \
+        "Breaks1 has wrong type!");
+
+//// Two holder classes:
+//typedef py::class_<BreaksBase<-1>, std::unique_ptr<BreaksBase<-1>>, std::unique_ptr<BreaksBase<-1>>> Breaks1;
+//CHECK_BROKEN(1);
+//// Two aliases:
+//typedef py::class_<BreaksBase<-2>, BreaksTramp<-2>, BreaksTramp<-2>> Breaks2;
+//CHECK_BROKEN(2);
+//// Holder + 2 aliases
+//typedef py::class_<BreaksBase<-3>, std::unique_ptr<BreaksBase<-3>>, BreaksTramp<-3>, BreaksTramp<-3>> Breaks3;
+//CHECK_BROKEN(3);
+//// Alias + 2 holders
+//typedef py::class_<BreaksBase<-4>, std::unique_ptr<BreaksBase<-4>>, BreaksTramp<-4>, std::shared_ptr<BreaksBase<-4>>> Breaks4;
+//CHECK_BROKEN(4);
+//// Invalid option (not a subclass or holder)
+//typedef py::class_<BreaksBase<-5>, BreaksTramp<-4>> Breaks5;
+//CHECK_BROKEN(5);
+//// Invalid option: multiple inheritance not supported:
+//template <> struct BreaksBase<-8> : BreaksBase<-6>, BreaksBase<-7> {};
+//typedef py::class_<BreaksBase<-8>, BreaksBase<-6>, BreaksBase<-7>> Breaks8;
+//CHECK_BROKEN(8);
diff --git a/3rdparty/pybind11/tests/test_class.py b/3rdparty/pybind11/tests/test_class.py
new file mode 100644
index 00000000..ed63ca85
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_class.py
@@ -0,0 +1,281 @@
+import pytest
+
+from pybind11_tests import class_ as m
+from pybind11_tests import UserType, ConstructorStats
+
+
+def test_repr():
+    # In Python 3.3+, repr() accesses __qualname__
+    assert "pybind11_type" in repr(type(UserType))
+    assert "UserType" in repr(UserType)
+
+
+def test_instance(msg):
+    with pytest.raises(TypeError) as excinfo:
+        m.NoConstructor()
+    assert msg(excinfo.value) == "m.class_.NoConstructor: No constructor defined!"
+
+    instance = m.NoConstructor.new_instance()
+
+    cstats = ConstructorStats.get(m.NoConstructor)
+    assert cstats.alive() == 1
+    del instance
+    assert cstats.alive() == 0
+
+
+def test_docstrings(doc):
+    assert doc(UserType) == "A `py::class_` type for testing"
+    assert UserType.__name__ == "UserType"
+    assert UserType.__module__ == "pybind11_tests"
+    assert UserType.get_value.__name__ == "get_value"
+    assert UserType.get_value.__module__ == "pybind11_tests"
+
+    assert doc(UserType.get_value) == """
+        get_value(self: m.UserType) -> int
+
+        Get value using a method
+    """
+    assert doc(UserType.value) == "Get/set value using a property"
+
+    assert doc(m.NoConstructor.new_instance) == """
+        new_instance() -> m.class_.NoConstructor
+
+        Return an instance
+    """
+
+
+def test_qualname(doc):
+    """Tests that a properly qualified name is set in __qualname__ (even in pre-3.3, where we
+    backport the attribute) and that generated docstrings properly use it and the module name"""
+    assert m.NestBase.__qualname__ == "NestBase"
+    assert m.NestBase.Nested.__qualname__ == "NestBase.Nested"
+
+    assert doc(m.NestBase.__init__) == """
+        __init__(self: m.class_.NestBase) -> None
+    """
+    assert doc(m.NestBase.g) == """
+        g(self: m.class_.NestBase, arg0: m.class_.NestBase.Nested) -> None
+    """
+    assert doc(m.NestBase.Nested.__init__) == """
+        __init__(self: m.class_.NestBase.Nested) -> None
+    """
+    assert doc(m.NestBase.Nested.fn) == """
+        fn(self: m.class_.NestBase.Nested, arg0: int, arg1: m.class_.NestBase, arg2: m.class_.NestBase.Nested) -> None
+    """  # noqa: E501 line too long
+    assert doc(m.NestBase.Nested.fa) == """
+        fa(self: m.class_.NestBase.Nested, a: int, b: m.class_.NestBase, c: m.class_.NestBase.Nested) -> None
+    """  # noqa: E501 line too long
+    assert m.NestBase.__module__ == "pybind11_tests.class_"
+    assert m.NestBase.Nested.__module__ == "pybind11_tests.class_"
+
+
+def test_inheritance(msg):
+    roger = m.Rabbit('Rabbit')
+    assert roger.name() + " is a " + roger.species() == "Rabbit is a parrot"
+    assert m.pet_name_species(roger) == "Rabbit is a parrot"
+
+    polly = m.Pet('Polly', 'parrot')
+    assert polly.name() + " is a " + polly.species() == "Polly is a parrot"
+    assert m.pet_name_species(polly) == "Polly is a parrot"
+
+    molly = m.Dog('Molly')
+    assert molly.name() + " is a " + molly.species() == "Molly is a dog"
+    assert m.pet_name_species(molly) == "Molly is a dog"
+
+    fred = m.Hamster('Fred')
+    assert fred.name() + " is a " + fred.species() == "Fred is a rodent"
+
+    assert m.dog_bark(molly) == "Woof!"
+
+    with pytest.raises(TypeError) as excinfo:
+        m.dog_bark(polly)
+    assert msg(excinfo.value) == """
+        dog_bark(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: m.class_.Dog) -> str
+
+        Invoked with: <m.class_.Pet object at 0>
+    """
+
+    with pytest.raises(TypeError) as excinfo:
+        m.Chimera("lion", "goat")
+    assert "No constructor defined!" in str(excinfo.value)
+
+
+def test_automatic_upcasting():
+    assert type(m.return_class_1()).__name__ == "DerivedClass1"
+    assert type(m.return_class_2()).__name__ == "DerivedClass2"
+    assert type(m.return_none()).__name__ == "NoneType"
+    # Repeat these a few times in a random order to ensure no invalid caching is applied
+    assert type(m.return_class_n(1)).__name__ == "DerivedClass1"
+    assert type(m.return_class_n(2)).__name__ == "DerivedClass2"
+    assert type(m.return_class_n(0)).__name__ == "BaseClass"
+    assert type(m.return_class_n(2)).__name__ == "DerivedClass2"
+    assert type(m.return_class_n(2)).__name__ == "DerivedClass2"
+    assert type(m.return_class_n(0)).__name__ == "BaseClass"
+    assert type(m.return_class_n(1)).__name__ == "DerivedClass1"
+
+
+def test_isinstance():
+    objects = [tuple(), dict(), m.Pet("Polly", "parrot")] + [m.Dog("Molly")] * 4
+    expected = (True, True, True, True, True, False, False)
+    assert m.check_instances(objects) == expected
+
+
+def test_mismatched_holder():
+    import re
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.mismatched_holder_1()
+    assert re.match('generic_type: type ".*MismatchDerived1" does not have a non-default '
+                    'holder type while its base ".*MismatchBase1" does', str(excinfo.value))
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.mismatched_holder_2()
+    assert re.match('generic_type: type ".*MismatchDerived2" has a non-default holder type '
+                    'while its base ".*MismatchBase2" does not', str(excinfo.value))
+
+
+def test_override_static():
+    """#511: problem with inheritance + overwritten def_static"""
+    b = m.MyBase.make()
+    d1 = m.MyDerived.make2()
+    d2 = m.MyDerived.make()
+
+    assert isinstance(b, m.MyBase)
+    assert isinstance(d1, m.MyDerived)
+    assert isinstance(d2, m.MyDerived)
+
+
+def test_implicit_conversion_life_support():
+    """Ensure the lifetime of temporary objects created for implicit conversions"""
+    assert m.implicitly_convert_argument(UserType(5)) == 5
+    assert m.implicitly_convert_variable(UserType(5)) == 5
+
+    assert "outside a bound function" in m.implicitly_convert_variable_fail(UserType(5))
+
+
+def test_operator_new_delete(capture):
+    """Tests that class-specific operator new/delete functions are invoked"""
+
+    class SubAliased(m.AliasedHasOpNewDelSize):
+        pass
+
+    with capture:
+        a = m.HasOpNewDel()
+        b = m.HasOpNewDelSize()
+        d = m.HasOpNewDelBoth()
+    assert capture == """
+        A new 8
+        B new 4
+        D new 32
+    """
+    sz_alias = str(m.AliasedHasOpNewDelSize.size_alias)
+    sz_noalias = str(m.AliasedHasOpNewDelSize.size_noalias)
+    with capture:
+        c = m.AliasedHasOpNewDelSize()
+        c2 = SubAliased()
+    assert capture == (
+        "C new " + sz_noalias + "\n" +
+        "C new " + sz_alias + "\n"
+    )
+
+    with capture:
+        del a
+        pytest.gc_collect()
+        del b
+        pytest.gc_collect()
+        del d
+        pytest.gc_collect()
+    assert capture == """
+        A delete
+        B delete 4
+        D delete
+    """
+
+    with capture:
+        del c
+        pytest.gc_collect()
+        del c2
+        pytest.gc_collect()
+    assert capture == (
+        "C delete " + sz_noalias + "\n" +
+        "C delete " + sz_alias + "\n"
+    )
+
+
+def test_bind_protected_functions():
+    """Expose protected member functions to Python using a helper class"""
+    a = m.ProtectedA()
+    assert a.foo() == 42
+
+    b = m.ProtectedB()
+    assert b.foo() == 42
+
+    class C(m.ProtectedB):
+        def __init__(self):
+            m.ProtectedB.__init__(self)
+
+        def foo(self):
+            return 0
+
+    c = C()
+    assert c.foo() == 0
+
+
+def test_brace_initialization():
+    """ Tests that simple POD classes can be constructed using C++11 brace initialization """
+    a = m.BraceInitialization(123, "test")
+    assert a.field1 == 123
+    assert a.field2 == "test"
+
+    # Tests that a non-simple class doesn't get brace initialization (if the
+    # class defines an initializer_list constructor, in particular, it would
+    # win over the expected constructor).
+    b = m.NoBraceInitialization([123, 456])
+    assert b.vec == [123, 456]
+
+
+@pytest.unsupported_on_pypy
+def test_class_refcount():
+    """Instances must correctly increase/decrease the reference count of their types (#1029)"""
+    from sys import getrefcount
+
+    class PyDog(m.Dog):
+        pass
+
+    for cls in m.Dog, PyDog:
+        refcount_1 = getrefcount(cls)
+        molly = [cls("Molly") for _ in range(10)]
+        refcount_2 = getrefcount(cls)
+
+        del molly
+        pytest.gc_collect()
+        refcount_3 = getrefcount(cls)
+
+        assert refcount_1 == refcount_3
+        assert refcount_2 > refcount_1
+
+
+def test_reentrant_implicit_conversion_failure(msg):
+    # ensure that there is no runaway reentrant implicit conversion (#1035)
+    with pytest.raises(TypeError) as excinfo:
+        m.BogusImplicitConversion(0)
+    assert msg(excinfo.value) == '''
+        __init__(): incompatible constructor arguments. The following argument types are supported:
+            1. m.class_.BogusImplicitConversion(arg0: m.class_.BogusImplicitConversion)
+
+        Invoked with: 0
+    '''
+
+
+def test_error_after_conversions():
+    with pytest.raises(TypeError) as exc_info:
+        m.test_error_after_conversions("hello")
+    assert str(exc_info.value).startswith(
+        "Unable to convert function return value to a Python type!")
+
+
+def test_aligned():
+    if hasattr(m, "Aligned"):
+        p = m.Aligned().ptr()
+        assert p % 1024 == 0
diff --git a/3rdparty/pybind11/tests/test_cmake_build/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/CMakeLists.txt
new file mode 100644
index 00000000..c9b5fcb2
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/CMakeLists.txt
@@ -0,0 +1,58 @@
+add_custom_target(test_cmake_build)
+
+if(CMAKE_VERSION VERSION_LESS 3.1)
+  # 3.0 needed for interface library for subdirectory_target/installed_target
+  # 3.1 needed for cmake -E env for testing
+  return()
+endif()
+
+include(CMakeParseArguments)
+function(pybind11_add_build_test name)
+  cmake_parse_arguments(ARG "INSTALL" "" "" ${ARGN})
+
+  set(build_options "-DCMAKE_PREFIX_PATH=${PROJECT_BINARY_DIR}/mock_install"
+                    "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
+                    "-DPYTHON_EXECUTABLE:FILEPATH=${PYTHON_EXECUTABLE}"
+                    "-DPYBIND11_CPP_STANDARD=${PYBIND11_CPP_STANDARD}")
+  if(NOT ARG_INSTALL)
+    list(APPEND build_options "-DPYBIND11_PROJECT_DIR=${PROJECT_SOURCE_DIR}")
+  endif()
+
+  add_custom_target(test_${name} ${CMAKE_CTEST_COMMAND}
+    --quiet --output-log ${name}.log
+    --build-and-test "${CMAKE_CURRENT_SOURCE_DIR}/${name}"
+                     "${CMAKE_CURRENT_BINARY_DIR}/${name}"
+    --build-config Release
+    --build-noclean
+    --build-generator ${CMAKE_GENERATOR}
+    $<$<BOOL:${CMAKE_GENERATOR_PLATFORM}>:--build-generator-platform> ${CMAKE_GENERATOR_PLATFORM}
+    --build-makeprogram ${CMAKE_MAKE_PROGRAM}
+    --build-target check
+    --build-options ${build_options}
+  )
+  if(ARG_INSTALL)
+    add_dependencies(test_${name} mock_install)
+  endif()
+  add_dependencies(test_cmake_build test_${name})
+endfunction()
+
+pybind11_add_build_test(subdirectory_function)
+pybind11_add_build_test(subdirectory_target)
+if(NOT ${PYTHON_MODULE_EXTENSION} MATCHES "pypy")
+  pybind11_add_build_test(subdirectory_embed)
+endif()
+
+if(PYBIND11_INSTALL)
+  add_custom_target(mock_install ${CMAKE_COMMAND}
+    "-DCMAKE_INSTALL_PREFIX=${PROJECT_BINARY_DIR}/mock_install"
+    -P "${PROJECT_BINARY_DIR}/cmake_install.cmake"
+  )
+
+  pybind11_add_build_test(installed_function INSTALL)
+  pybind11_add_build_test(installed_target INSTALL)
+  if(NOT ${PYTHON_MODULE_EXTENSION} MATCHES "pypy")
+    pybind11_add_build_test(installed_embed INSTALL)
+  endif()
+endif()
+
+add_dependencies(check test_cmake_build)
diff --git a/3rdparty/pybind11/tests/test_cmake_build/embed.cpp b/3rdparty/pybind11/tests/test_cmake_build/embed.cpp
new file mode 100644
index 00000000..b9581d2f
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/embed.cpp
@@ -0,0 +1,21 @@
+#include <pybind11/embed.h>
+namespace py = pybind11;
+
+PYBIND11_EMBEDDED_MODULE(test_cmake_build, m) {
+    m.def("add", [](int i, int j) { return i + j; });
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2)
+        throw std::runtime_error("Expected test.py file as the first argument");
+    auto test_py_file = argv[1];
+
+    py::scoped_interpreter guard{};
+
+    auto m = py::module::import("test_cmake_build");
+    if (m.attr("add")(1, 2).cast<int>() != 3)
+        throw std::runtime_error("embed.cpp failed");
+
+    py::module::import("sys").attr("argv") = py::make_tuple("test.py", "embed.cpp");
+    py::eval_file(test_py_file, py::globals());
+}
diff --git a/3rdparty/pybind11/tests/test_cmake_build/installed_embed/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/installed_embed/CMakeLists.txt
new file mode 100644
index 00000000..f7fc09c2
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/installed_embed/CMakeLists.txt
@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.0)
+project(test_installed_embed CXX)
+
+set(CMAKE_MODULE_PATH "")
+find_package(pybind11 CONFIG REQUIRED)
+message(STATUS "Found pybind11 v${pybind11_VERSION}: ${pybind11_INCLUDE_DIRS}")
+
+add_executable(test_cmake_build ../embed.cpp)
+target_link_libraries(test_cmake_build PRIVATE pybind11::embed)
+
+# Do not treat includes from IMPORTED target as SYSTEM (Python headers in pybind11::embed).
+# This may be needed to resolve header conflicts, e.g. between Python release and debug headers.
+set_target_properties(test_cmake_build PROPERTIES NO_SYSTEM_FROM_IMPORTED ON)
+
+add_custom_target(check $<TARGET_FILE:test_cmake_build> ${PROJECT_SOURCE_DIR}/../test.py)
diff --git a/3rdparty/pybind11/tests/test_cmake_build/installed_function/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/installed_function/CMakeLists.txt
new file mode 100644
index 00000000..e0c20a8a
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/installed_function/CMakeLists.txt
@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 2.8.12)
+project(test_installed_module CXX)
+
+set(CMAKE_MODULE_PATH "")
+
+find_package(pybind11 CONFIG REQUIRED)
+message(STATUS "Found pybind11 v${pybind11_VERSION}: ${pybind11_INCLUDE_DIRS}")
+
+pybind11_add_module(test_cmake_build SHARED NO_EXTRAS ../main.cpp)
+
+add_custom_target(check ${CMAKE_COMMAND} -E env PYTHONPATH=$<TARGET_FILE_DIR:test_cmake_build>
+                  ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/../test.py ${PROJECT_NAME})
diff --git a/3rdparty/pybind11/tests/test_cmake_build/installed_target/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/installed_target/CMakeLists.txt
new file mode 100644
index 00000000..cd3ae6f7
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/installed_target/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.0)
+project(test_installed_target CXX)
+
+set(CMAKE_MODULE_PATH "")
+
+find_package(pybind11 CONFIG REQUIRED)
+message(STATUS "Found pybind11 v${pybind11_VERSION}: ${pybind11_INCLUDE_DIRS}")
+
+add_library(test_cmake_build MODULE ../main.cpp)
+
+target_link_libraries(test_cmake_build PRIVATE pybind11::module)
+
+# make sure result is, for example, test_installed_target.so, not libtest_installed_target.dylib
+set_target_properties(test_cmake_build PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
+                                                  SUFFIX "${PYTHON_MODULE_EXTENSION}")
+
+# Do not treat includes from IMPORTED target as SYSTEM (Python headers in pybind11::module).
+# This may be needed to resolve header conflicts, e.g. between Python release and debug headers.
+set_target_properties(test_cmake_build PROPERTIES NO_SYSTEM_FROM_IMPORTED ON)
+
+add_custom_target(check ${CMAKE_COMMAND} -E env PYTHONPATH=$<TARGET_FILE_DIR:test_cmake_build>
+                  ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/../test.py ${PROJECT_NAME})
diff --git a/3rdparty/pybind11/tests/test_cmake_build/main.cpp b/3rdparty/pybind11/tests/test_cmake_build/main.cpp
new file mode 100644
index 00000000..e30f2c4b
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/main.cpp
@@ -0,0 +1,6 @@
+#include <pybind11/pybind11.h>
+namespace py = pybind11;
+
+PYBIND11_MODULE(test_cmake_build, m) {
+    m.def("add", [](int i, int j) { return i + j; });
+}
diff --git a/3rdparty/pybind11/tests/test_cmake_build/subdirectory_embed/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/subdirectory_embed/CMakeLists.txt
new file mode 100644
index 00000000..88ba60dd
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/subdirectory_embed/CMakeLists.txt
@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.0)
+project(test_subdirectory_embed CXX)
+
+set(PYBIND11_INSTALL ON CACHE BOOL "")
+set(PYBIND11_EXPORT_NAME test_export)
+
+add_subdirectory(${PYBIND11_PROJECT_DIR} pybind11)
+
+# Test basic target functionality
+add_executable(test_cmake_build ../embed.cpp)
+target_link_libraries(test_cmake_build PRIVATE pybind11::embed)
+
+add_custom_target(check $<TARGET_FILE:test_cmake_build> ${PROJECT_SOURCE_DIR}/../test.py)
+
+# Test custom export group -- PYBIND11_EXPORT_NAME
+add_library(test_embed_lib ../embed.cpp)
+target_link_libraries(test_embed_lib PRIVATE pybind11::embed)
+
+install(TARGETS test_embed_lib
+        EXPORT  test_export
+        ARCHIVE DESTINATION bin
+        LIBRARY DESTINATION lib
+        RUNTIME DESTINATION lib)
+install(EXPORT      test_export
+        DESTINATION lib/cmake/test_export/test_export-Targets.cmake)
diff --git a/3rdparty/pybind11/tests/test_cmake_build/subdirectory_function/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/subdirectory_function/CMakeLists.txt
new file mode 100644
index 00000000..278007ae
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/subdirectory_function/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 2.8.12)
+project(test_subdirectory_module CXX)
+
+add_subdirectory(${PYBIND11_PROJECT_DIR} pybind11)
+pybind11_add_module(test_cmake_build THIN_LTO ../main.cpp)
+
+add_custom_target(check ${CMAKE_COMMAND} -E env PYTHONPATH=$<TARGET_FILE_DIR:test_cmake_build>
+                  ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/../test.py ${PROJECT_NAME})
diff --git a/3rdparty/pybind11/tests/test_cmake_build/subdirectory_target/CMakeLists.txt b/3rdparty/pybind11/tests/test_cmake_build/subdirectory_target/CMakeLists.txt
new file mode 100644
index 00000000..6b142d62
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/subdirectory_target/CMakeLists.txt
@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.0)
+project(test_subdirectory_target CXX)
+
+add_subdirectory(${PYBIND11_PROJECT_DIR} pybind11)
+
+add_library(test_cmake_build MODULE ../main.cpp)
+
+target_link_libraries(test_cmake_build PRIVATE pybind11::module)
+
+# make sure result is, for example, test_installed_target.so, not libtest_installed_target.dylib
+set_target_properties(test_cmake_build PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}"
+                                                  SUFFIX "${PYTHON_MODULE_EXTENSION}")
+
+add_custom_target(check ${CMAKE_COMMAND} -E env PYTHONPATH=$<TARGET_FILE_DIR:test_cmake_build>
+                  ${PYTHON_EXECUTABLE} ${PROJECT_SOURCE_DIR}/../test.py ${PROJECT_NAME})
diff --git a/3rdparty/pybind11/tests/test_cmake_build/test.py b/3rdparty/pybind11/tests/test_cmake_build/test.py
new file mode 100644
index 00000000..1467a61d
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_cmake_build/test.py
@@ -0,0 +1,5 @@
+import sys
+import test_cmake_build
+
+assert test_cmake_build.add(1, 2) == 3
+print("{} imports, runs, and adds: 1 + 2 = 3".format(sys.argv[1]))
diff --git a/3rdparty/pybind11/tests/test_constants_and_functions.cpp b/3rdparty/pybind11/tests/test_constants_and_functions.cpp
new file mode 100644
index 00000000..e8ec74b7
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_constants_and_functions.cpp
@@ -0,0 +1,127 @@
+/*
+    tests/test_constants_and_functions.cpp -- global constants and functions, enumerations, raw byte strings
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+enum MyEnum { EFirstEntry = 1, ESecondEntry };
+
+std::string test_function1() {
+    return "test_function()";
+}
+
+std::string test_function2(MyEnum k) {
+    return "test_function(enum=" + std::to_string(k) + ")";
+}
+
+std::string test_function3(int i) {
+    return "test_function(" + std::to_string(i) + ")";
+}
+
+py::str test_function4()           { return "test_function()"; }
+py::str test_function4(char *)     { return "test_function(char *)"; }
+py::str test_function4(int, float) { return "test_function(int, float)"; }
+py::str test_function4(float, int) { return "test_function(float, int)"; }
+
+py::bytes return_bytes() {
+    const char *data = "\x01\x00\x02\x00";
+    return std::string(data, 4);
+}
+
+std::string print_bytes(py::bytes bytes) {
+    std::string ret = "bytes[";
+    const auto value = static_cast<std::string>(bytes);
+    for (size_t i = 0; i < value.length(); ++i) {
+        ret += std::to_string(static_cast<int>(value[i])) + " ";
+    }
+    ret.back() = ']';
+    return ret;
+}
+
+// Test that we properly handle C++17 exception specifiers (which are part of the function signature
+// in C++17).  These should all still work before C++17, but don't affect the function signature.
+namespace test_exc_sp {
+int f1(int x) noexcept { return x+1; }
+int f2(int x) noexcept(true) { return x+2; }
+int f3(int x) noexcept(false) { return x+3; }
+#if defined(__GNUG__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wdeprecated"
+#endif
+int f4(int x) throw() { return x+4; } // Deprecated equivalent to noexcept(true)
+#if defined(__GNUG__)
+#  pragma GCC diagnostic pop
+#endif
+struct C {
+    int m1(int x) noexcept { return x-1; }
+    int m2(int x) const noexcept { return x-2; }
+    int m3(int x) noexcept(true) { return x-3; }
+    int m4(int x) const noexcept(true) { return x-4; }
+    int m5(int x) noexcept(false) { return x-5; }
+    int m6(int x) const noexcept(false) { return x-6; }
+#if defined(__GNUG__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wdeprecated"
+#endif
+    int m7(int x) throw() { return x-7; }
+    int m8(int x) const throw() { return x-8; }
+#if defined(__GNUG__)
+#  pragma GCC diagnostic pop
+#endif
+};
+}
+
+
+TEST_SUBMODULE(constants_and_functions, m) {
+    // test_constants
+    m.attr("some_constant") = py::int_(14);
+
+    // test_function_overloading
+    m.def("test_function", &test_function1);
+    m.def("test_function", &test_function2);
+    m.def("test_function", &test_function3);
+
+#if defined(PYBIND11_OVERLOAD_CAST)
+    m.def("test_function", py::overload_cast<>(&test_function4));
+    m.def("test_function", py::overload_cast<char *>(&test_function4));
+    m.def("test_function", py::overload_cast<int, float>(&test_function4));
+    m.def("test_function", py::overload_cast<float, int>(&test_function4));
+#else
+    m.def("test_function", static_cast<py::str (*)()>(&test_function4));
+    m.def("test_function", static_cast<py::str (*)(char *)>(&test_function4));
+    m.def("test_function", static_cast<py::str (*)(int, float)>(&test_function4));
+    m.def("test_function", static_cast<py::str (*)(float, int)>(&test_function4));
+#endif
+
+    py::enum_<MyEnum>(m, "MyEnum")
+        .value("EFirstEntry", EFirstEntry)
+        .value("ESecondEntry", ESecondEntry)
+        .export_values();
+
+    // test_bytes
+    m.def("return_bytes", &return_bytes);
+    m.def("print_bytes", &print_bytes);
+
+    // test_exception_specifiers
+    using namespace test_exc_sp;
+    py::class_<C>(m, "C")
+        .def(py::init<>())
+        .def("m1", &C::m1)
+        .def("m2", &C::m2)
+        .def("m3", &C::m3)
+        .def("m4", &C::m4)
+        .def("m5", &C::m5)
+        .def("m6", &C::m6)
+        .def("m7", &C::m7)
+        .def("m8", &C::m8)
+        ;
+    m.def("f1", f1);
+    m.def("f2", f2);
+    m.def("f3", f3);
+    m.def("f4", f4);
+}
diff --git a/3rdparty/pybind11/tests/test_constants_and_functions.py b/3rdparty/pybind11/tests/test_constants_and_functions.py
new file mode 100644
index 00000000..472682d6
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_constants_and_functions.py
@@ -0,0 +1,39 @@
+from pybind11_tests import constants_and_functions as m
+
+
+def test_constants():
+    assert m.some_constant == 14
+
+
+def test_function_overloading():
+    assert m.test_function() == "test_function()"
+    assert m.test_function(7) == "test_function(7)"
+    assert m.test_function(m.MyEnum.EFirstEntry) == "test_function(enum=1)"
+    assert m.test_function(m.MyEnum.ESecondEntry) == "test_function(enum=2)"
+
+    assert m.test_function() == "test_function()"
+    assert m.test_function("abcd") == "test_function(char *)"
+    assert m.test_function(1, 1.0) == "test_function(int, float)"
+    assert m.test_function(1, 1.0) == "test_function(int, float)"
+    assert m.test_function(2.0, 2) == "test_function(float, int)"
+
+
+def test_bytes():
+    assert m.print_bytes(m.return_bytes()) == "bytes[1 0 2 0]"
+
+
+def test_exception_specifiers():
+    c = m.C()
+    assert c.m1(2) == 1
+    assert c.m2(3) == 1
+    assert c.m3(5) == 2
+    assert c.m4(7) == 3
+    assert c.m5(10) == 5
+    assert c.m6(14) == 8
+    assert c.m7(20) == 13
+    assert c.m8(29) == 21
+
+    assert m.f1(33) == 34
+    assert m.f2(53) == 55
+    assert m.f3(86) == 89
+    assert m.f4(140) == 144
diff --git a/3rdparty/pybind11/tests/test_copy_move.cpp b/3rdparty/pybind11/tests/test_copy_move.cpp
new file mode 100644
index 00000000..98d5e0a0
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_copy_move.cpp
@@ -0,0 +1,213 @@
+/*
+    tests/test_copy_move_policies.cpp -- 'copy' and 'move' return value policies
+                                         and related tests
+
+    Copyright (c) 2016 Ben North <ben@redfrontdoor.org>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/stl.h>
+
+template <typename derived>
+struct empty {
+    static const derived& get_one() { return instance_; }
+    static derived instance_;
+};
+
+struct lacking_copy_ctor : public empty<lacking_copy_ctor> {
+    lacking_copy_ctor() {}
+    lacking_copy_ctor(const lacking_copy_ctor& other) = delete;
+};
+
+template <> lacking_copy_ctor empty<lacking_copy_ctor>::instance_ = {};
+
+struct lacking_move_ctor : public empty<lacking_move_ctor> {
+    lacking_move_ctor() {}
+    lacking_move_ctor(const lacking_move_ctor& other) = delete;
+    lacking_move_ctor(lacking_move_ctor&& other) = delete;
+};
+
+template <> lacking_move_ctor empty<lacking_move_ctor>::instance_ = {};
+
+/* Custom type caster move/copy test classes */
+class MoveOnlyInt {
+public:
+    MoveOnlyInt() { print_default_created(this); }
+    MoveOnlyInt(int v) : value{std::move(v)} { print_created(this, value); }
+    MoveOnlyInt(MoveOnlyInt &&m) { print_move_created(this, m.value); std::swap(value, m.value); }
+    MoveOnlyInt &operator=(MoveOnlyInt &&m) { print_move_assigned(this, m.value); std::swap(value, m.value); return *this; }
+    MoveOnlyInt(const MoveOnlyInt &) = delete;
+    MoveOnlyInt &operator=(const MoveOnlyInt &) = delete;
+    ~MoveOnlyInt() { print_destroyed(this); }
+
+    int value;
+};
+class MoveOrCopyInt {
+public:
+    MoveOrCopyInt() { print_default_created(this); }
+    MoveOrCopyInt(int v) : value{std::move(v)} { print_created(this, value); }
+    MoveOrCopyInt(MoveOrCopyInt &&m) { print_move_created(this, m.value); std::swap(value, m.value); }
+    MoveOrCopyInt &operator=(MoveOrCopyInt &&m) { print_move_assigned(this, m.value); std::swap(value, m.value); return *this; }
+    MoveOrCopyInt(const MoveOrCopyInt &c) { print_copy_created(this, c.value); value = c.value; }
+    MoveOrCopyInt &operator=(const MoveOrCopyInt &c) { print_copy_assigned(this, c.value); value = c.value; return *this; }
+    ~MoveOrCopyInt() { print_destroyed(this); }
+
+    int value;
+};
+class CopyOnlyInt {
+public:
+    CopyOnlyInt() { print_default_created(this); }
+    CopyOnlyInt(int v) : value{std::move(v)} { print_created(this, value); }
+    CopyOnlyInt(const CopyOnlyInt &c) { print_copy_created(this, c.value); value = c.value; }
+    CopyOnlyInt &operator=(const CopyOnlyInt &c) { print_copy_assigned(this, c.value); value = c.value; return *this; }
+    ~CopyOnlyInt() { print_destroyed(this); }
+
+    int value;
+};
+NAMESPACE_BEGIN(pybind11)
+NAMESPACE_BEGIN(detail)
+template <> struct type_caster<MoveOnlyInt> {
+    PYBIND11_TYPE_CASTER(MoveOnlyInt, _("MoveOnlyInt"));
+    bool load(handle src, bool) { value = MoveOnlyInt(src.cast<int>()); return true; }
+    static handle cast(const MoveOnlyInt &m, return_value_policy r, handle p) { return pybind11::cast(m.value, r, p); }
+};
+
+template <> struct type_caster<MoveOrCopyInt> {
+    PYBIND11_TYPE_CASTER(MoveOrCopyInt, _("MoveOrCopyInt"));
+    bool load(handle src, bool) { value = MoveOrCopyInt(src.cast<int>()); return true; }
+    static handle cast(const MoveOrCopyInt &m, return_value_policy r, handle p) { return pybind11::cast(m.value, r, p); }
+};
+
+template <> struct type_caster<CopyOnlyInt> {
+protected:
+    CopyOnlyInt value;
+public:
+    static constexpr auto name = _("CopyOnlyInt");
+    bool load(handle src, bool) { value = CopyOnlyInt(src.cast<int>()); return true; }
+    static handle cast(const CopyOnlyInt &m, return_value_policy r, handle p) { return pybind11::cast(m.value, r, p); }
+    static handle cast(const CopyOnlyInt *src, return_value_policy policy, handle parent) {
+        if (!src) return none().release();
+        return cast(*src, policy, parent);
+    }
+    operator CopyOnlyInt*() { return &value; }
+    operator CopyOnlyInt&() { return value; }
+    template <typename T> using cast_op_type = pybind11::detail::cast_op_type<T>;
+};
+NAMESPACE_END(detail)
+NAMESPACE_END(pybind11)
+
+TEST_SUBMODULE(copy_move_policies, m) {
+    // test_lacking_copy_ctor
+    py::class_<lacking_copy_ctor>(m, "lacking_copy_ctor")
+        .def_static("get_one", &lacking_copy_ctor::get_one,
+                    py::return_value_policy::copy);
+    // test_lacking_move_ctor
+    py::class_<lacking_move_ctor>(m, "lacking_move_ctor")
+        .def_static("get_one", &lacking_move_ctor::get_one,
+                    py::return_value_policy::move);
+
+    // test_move_and_copy_casts
+    m.def("move_and_copy_casts", [](py::object o) {
+        int r = 0;
+        r += py::cast<MoveOrCopyInt>(o).value; /* moves */
+        r += py::cast<MoveOnlyInt>(o).value; /* moves */
+        r += py::cast<CopyOnlyInt>(o).value; /* copies */
+        MoveOrCopyInt m1(py::cast<MoveOrCopyInt>(o)); /* moves */
+        MoveOnlyInt m2(py::cast<MoveOnlyInt>(o)); /* moves */
+        CopyOnlyInt m3(py::cast<CopyOnlyInt>(o)); /* copies */
+        r += m1.value + m2.value + m3.value;
+
+        return r;
+    });
+
+    // test_move_and_copy_loads
+    m.def("move_only", [](MoveOnlyInt m) { return m.value; });
+    m.def("move_or_copy", [](MoveOrCopyInt m) { return m.value; });
+    m.def("copy_only", [](CopyOnlyInt m) { return m.value; });
+    m.def("move_pair", [](std::pair<MoveOnlyInt, MoveOrCopyInt> p) {
+        return p.first.value + p.second.value;
+    });
+    m.def("move_tuple", [](std::tuple<MoveOnlyInt, MoveOrCopyInt, MoveOnlyInt> t) {
+        return std::get<0>(t).value + std::get<1>(t).value + std::get<2>(t).value;
+    });
+    m.def("copy_tuple", [](std::tuple<CopyOnlyInt, CopyOnlyInt> t) {
+        return std::get<0>(t).value + std::get<1>(t).value;
+    });
+    m.def("move_copy_nested", [](std::pair<MoveOnlyInt, std::pair<std::tuple<MoveOrCopyInt, CopyOnlyInt, std::tuple<MoveOnlyInt>>, MoveOrCopyInt>> x) {
+        return x.first.value + std::get<0>(x.second.first).value + std::get<1>(x.second.first).value +
+            std::get<0>(std::get<2>(x.second.first)).value + x.second.second.value;
+    });
+    m.def("move_and_copy_cstats", []() {
+        ConstructorStats::gc();
+        // Reset counts to 0 so that previous tests don't affect later ones:
+        auto &mc = ConstructorStats::get<MoveOrCopyInt>();
+        mc.move_assignments = mc.move_constructions = mc.copy_assignments = mc.copy_constructions = 0;
+        auto &mo = ConstructorStats::get<MoveOnlyInt>();
+        mo.move_assignments = mo.move_constructions = mo.copy_assignments = mo.copy_constructions = 0;
+        auto &co = ConstructorStats::get<CopyOnlyInt>();
+        co.move_assignments = co.move_constructions = co.copy_assignments = co.copy_constructions = 0;
+        py::dict d;
+        d["MoveOrCopyInt"] = py::cast(mc, py::return_value_policy::reference);
+        d["MoveOnlyInt"] = py::cast(mo, py::return_value_policy::reference);
+        d["CopyOnlyInt"] = py::cast(co, py::return_value_policy::reference);
+        return d;
+    });
+#ifdef PYBIND11_HAS_OPTIONAL
+    // test_move_and_copy_load_optional
+    m.attr("has_optional") = true;
+    m.def("move_optional", [](std::optional<MoveOnlyInt> o) {
+        return o->value;
+    });
+    m.def("move_or_copy_optional", [](std::optional<MoveOrCopyInt> o) {
+        return o->value;
+    });
+    m.def("copy_optional", [](std::optional<CopyOnlyInt> o) {
+        return o->value;
+    });
+    m.def("move_optional_tuple", [](std::optional<std::tuple<MoveOrCopyInt, MoveOnlyInt, CopyOnlyInt>> x) {
+        return std::get<0>(*x).value + std::get<1>(*x).value + std::get<2>(*x).value;
+    });
+#else
+    m.attr("has_optional") = false;
+#endif
+
+    // #70 compilation issue if operator new is not public
+    struct PrivateOpNew {
+        int value = 1;
+    private:
+#if defined(_MSC_VER)
+#  pragma warning(disable: 4822) // warning C4822: local class member function does not have a body
+#endif
+        void *operator new(size_t bytes);
+    };
+    py::class_<PrivateOpNew>(m, "PrivateOpNew").def_readonly("value", &PrivateOpNew::value);
+    m.def("private_op_new_value", []() { return PrivateOpNew(); });
+    m.def("private_op_new_reference", []() -> const PrivateOpNew & {
+        static PrivateOpNew x{};
+        return x;
+    }, py::return_value_policy::reference);
+
+    // test_move_fallback
+    // #389: rvp::move should fall-through to copy on non-movable objects
+    struct MoveIssue1 {
+        int v;
+        MoveIssue1(int v) : v{v} {}
+        MoveIssue1(const MoveIssue1 &c) = default;
+        MoveIssue1(MoveIssue1 &&) = delete;
+    };
+    py::class_<MoveIssue1>(m, "MoveIssue1").def(py::init<int>()).def_readwrite("value", &MoveIssue1::v);
+
+    struct MoveIssue2 {
+        int v;
+        MoveIssue2(int v) : v{v} {}
+        MoveIssue2(MoveIssue2 &&) = default;
+    };
+    py::class_<MoveIssue2>(m, "MoveIssue2").def(py::init<int>()).def_readwrite("value", &MoveIssue2::v);
+
+    m.def("get_moveissue1", [](int i) { return new MoveIssue1(i); }, py::return_value_policy::move);
+    m.def("get_moveissue2", [](int i) { return MoveIssue2(i); }, py::return_value_policy::move);
+}
diff --git a/3rdparty/pybind11/tests/test_copy_move.py b/3rdparty/pybind11/tests/test_copy_move.py
new file mode 100644
index 00000000..0e671d96
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_copy_move.py
@@ -0,0 +1,112 @@
+import pytest
+from pybind11_tests import copy_move_policies as m
+
+
+def test_lacking_copy_ctor():
+    with pytest.raises(RuntimeError) as excinfo:
+        m.lacking_copy_ctor.get_one()
+    assert "is non-copyable!" in str(excinfo.value)
+
+
+def test_lacking_move_ctor():
+    with pytest.raises(RuntimeError) as excinfo:
+        m.lacking_move_ctor.get_one()
+    assert "is neither movable nor copyable!" in str(excinfo.value)
+
+
+def test_move_and_copy_casts():
+    """Cast some values in C++ via custom type casters and count the number of moves/copies."""
+
+    cstats = m.move_and_copy_cstats()
+    c_m, c_mc, c_c = cstats["MoveOnlyInt"], cstats["MoveOrCopyInt"], cstats["CopyOnlyInt"]
+
+    # The type move constructions/assignments below each get incremented: the move assignment comes
+    # from the type_caster load; the move construction happens when extracting that via a cast or
+    # loading into an argument.
+    assert m.move_and_copy_casts(3) == 18
+    assert c_m.copy_assignments + c_m.copy_constructions == 0
+    assert c_m.move_assignments == 2
+    assert c_m.move_constructions >= 2
+    assert c_mc.alive() == 0
+    assert c_mc.copy_assignments + c_mc.copy_constructions == 0
+    assert c_mc.move_assignments == 2
+    assert c_mc.move_constructions >= 2
+    assert c_c.alive() == 0
+    assert c_c.copy_assignments == 2
+    assert c_c.copy_constructions >= 2
+    assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
+
+
+def test_move_and_copy_loads():
+    """Call some functions that load arguments via custom type casters and count the number of
+    moves/copies."""
+
+    cstats = m.move_and_copy_cstats()
+    c_m, c_mc, c_c = cstats["MoveOnlyInt"], cstats["MoveOrCopyInt"], cstats["CopyOnlyInt"]
+
+    assert m.move_only(10) == 10  # 1 move, c_m
+    assert m.move_or_copy(11) == 11  # 1 move, c_mc
+    assert m.copy_only(12) == 12  # 1 copy, c_c
+    assert m.move_pair((13, 14)) == 27  # 1 c_m move, 1 c_mc move
+    assert m.move_tuple((15, 16, 17)) == 48  # 2 c_m moves, 1 c_mc move
+    assert m.copy_tuple((18, 19)) == 37  # 2 c_c copies
+    # Direct constructions: 2 c_m moves, 2 c_mc moves, 1 c_c copy
+    # Extra moves/copies when moving pairs/tuples: 3 c_m, 3 c_mc, 2 c_c
+    assert m.move_copy_nested((1, ((2, 3, (4,)), 5))) == 15
+
+    assert c_m.copy_assignments + c_m.copy_constructions == 0
+    assert c_m.move_assignments == 6
+    assert c_m.move_constructions == 9
+    assert c_mc.copy_assignments + c_mc.copy_constructions == 0
+    assert c_mc.move_assignments == 5
+    assert c_mc.move_constructions == 8
+    assert c_c.copy_assignments == 4
+    assert c_c.copy_constructions == 6
+    assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
+
+
+@pytest.mark.skipif(not m.has_optional, reason='no <optional>')
+def test_move_and_copy_load_optional():
+    """Tests move/copy loads of std::optional arguments"""
+
+    cstats = m.move_and_copy_cstats()
+    c_m, c_mc, c_c = cstats["MoveOnlyInt"], cstats["MoveOrCopyInt"], cstats["CopyOnlyInt"]
+
+    # The extra move/copy constructions below come from the std::optional move (which has to move
+    # its arguments):
+    assert m.move_optional(10) == 10  # c_m: 1 move assign, 2 move construct
+    assert m.move_or_copy_optional(11) == 11  # c_mc: 1 move assign, 2 move construct
+    assert m.copy_optional(12) == 12  # c_c: 1 copy assign, 2 copy construct
+    # 1 move assign + move construct moves each of c_m, c_mc, 1 c_c copy
+    # +1 move/copy construct each from moving the tuple
+    # +1 move/copy construct each from moving the optional (which moves the tuple again)
+    assert m.move_optional_tuple((3, 4, 5)) == 12
+
+    assert c_m.copy_assignments + c_m.copy_constructions == 0
+    assert c_m.move_assignments == 2
+    assert c_m.move_constructions == 5
+    assert c_mc.copy_assignments + c_mc.copy_constructions == 0
+    assert c_mc.move_assignments == 2
+    assert c_mc.move_constructions == 5
+    assert c_c.copy_assignments == 2
+    assert c_c.copy_constructions == 5
+    assert c_m.alive() + c_mc.alive() + c_c.alive() == 0
+
+
+def test_private_op_new():
+    """An object with a private `operator new` cannot be returned by value"""
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.private_op_new_value()
+    assert "is neither movable nor copyable" in str(excinfo.value)
+
+    assert m.private_op_new_reference().value == 1
+
+
+def test_move_fallback():
+    """#389: rvp::move should fall-through to copy on non-movable objects"""
+
+    m2 = m.get_moveissue2(2)
+    assert m2.value == 2
+    m1 = m.get_moveissue1(1)
+    assert m1.value == 1
diff --git a/3rdparty/pybind11/tests/test_docstring_options.cpp b/3rdparty/pybind11/tests/test_docstring_options.cpp
new file mode 100644
index 00000000..8c8f79fd
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_docstring_options.cpp
@@ -0,0 +1,61 @@
+/*
+    tests/test_docstring_options.cpp -- generation of docstrings and signatures
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+TEST_SUBMODULE(docstring_options, m) {
+    // test_docstring_options
+    {
+        py::options options;
+        options.disable_function_signatures();
+
+        m.def("test_function1", [](int, int) {}, py::arg("a"), py::arg("b"));
+        m.def("test_function2", [](int, int) {}, py::arg("a"), py::arg("b"), "A custom docstring");
+
+        m.def("test_overloaded1", [](int) {}, py::arg("i"), "Overload docstring");
+        m.def("test_overloaded1", [](double) {}, py::arg("d"));
+
+        m.def("test_overloaded2", [](int) {}, py::arg("i"), "overload docstring 1");
+        m.def("test_overloaded2", [](double) {}, py::arg("d"), "overload docstring 2");
+
+        m.def("test_overloaded3", [](int) {}, py::arg("i"));
+        m.def("test_overloaded3", [](double) {}, py::arg("d"), "Overload docstr");
+
+        options.enable_function_signatures();
+
+        m.def("test_function3", [](int, int) {}, py::arg("a"), py::arg("b"));
+        m.def("test_function4", [](int, int) {}, py::arg("a"), py::arg("b"), "A custom docstring");
+
+        options.disable_function_signatures().disable_user_defined_docstrings();
+
+        m.def("test_function5", [](int, int) {}, py::arg("a"), py::arg("b"), "A custom docstring");
+
+        {
+            py::options nested_options;
+            nested_options.enable_user_defined_docstrings();
+            m.def("test_function6", [](int, int) {}, py::arg("a"), py::arg("b"), "A custom docstring");
+        }
+    }
+
+    m.def("test_function7", [](int, int) {}, py::arg("a"), py::arg("b"), "A custom docstring");
+
+    {
+        py::options options;
+        options.disable_user_defined_docstrings();
+
+        struct DocstringTestFoo {
+            int value;
+            void setValue(int v) { value = v; }
+            int getValue() const { return value; }
+        };
+        py::class_<DocstringTestFoo>(m, "DocstringTestFoo", "This is a class docstring")
+            .def_property("value_prop", &DocstringTestFoo::getValue, &DocstringTestFoo::setValue, "This is a property docstring")
+        ;
+    }
+}
diff --git a/3rdparty/pybind11/tests/test_docstring_options.py b/3rdparty/pybind11/tests/test_docstring_options.py
new file mode 100644
index 00000000..0dbca609
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_docstring_options.py
@@ -0,0 +1,38 @@
+from pybind11_tests import docstring_options as m
+
+
+def test_docstring_options():
+    # options.disable_function_signatures()
+    assert not m.test_function1.__doc__
+
+    assert m.test_function2.__doc__ == "A custom docstring"
+
+    # docstring specified on just the first overload definition:
+    assert m.test_overloaded1.__doc__ == "Overload docstring"
+
+    # docstring on both overloads:
+    assert m.test_overloaded2.__doc__ == "overload docstring 1\noverload docstring 2"
+
+    # docstring on only second overload:
+    assert m.test_overloaded3.__doc__ == "Overload docstr"
+
+    # options.enable_function_signatures()
+    assert m.test_function3.__doc__ .startswith("test_function3(a: int, b: int) -> None")
+
+    assert m.test_function4.__doc__ .startswith("test_function4(a: int, b: int) -> None")
+    assert m.test_function4.__doc__ .endswith("A custom docstring\n")
+
+    # options.disable_function_signatures()
+    # options.disable_user_defined_docstrings()
+    assert not m.test_function5.__doc__
+
+    # nested options.enable_user_defined_docstrings()
+    assert m.test_function6.__doc__ == "A custom docstring"
+
+    # RAII destructor
+    assert m.test_function7.__doc__ .startswith("test_function7(a: int, b: int) -> None")
+    assert m.test_function7.__doc__ .endswith("A custom docstring\n")
+
+    # Suppression of user-defined docstrings for non-function objects
+    assert not m.DocstringTestFoo.__doc__
+    assert not m.DocstringTestFoo.value_prop.__doc__
diff --git a/3rdparty/pybind11/tests/test_eigen.cpp b/3rdparty/pybind11/tests/test_eigen.cpp
new file mode 100644
index 00000000..aba088d7
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_eigen.cpp
@@ -0,0 +1,329 @@
+/*
+    tests/eigen.cpp -- automatic conversion of Eigen types
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/eigen.h>
+#include <pybind11/stl.h>
+
+#if defined(_MSC_VER)
+#  pragma warning(disable: 4996) // C4996: std::unary_negation is deprecated
+#endif
+
+#include <Eigen/Cholesky>
+
+using MatrixXdR = Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>;
+
+
+
+// Sets/resets a testing reference matrix to have values of 10*r + c, where r and c are the
+// (1-based) row/column number.
+template <typename M> void reset_ref(M &x) {
+    for (int i = 0; i < x.rows(); i++) for (int j = 0; j < x.cols(); j++)
+        x(i, j) = 11 + 10*i + j;
+}
+
+// Returns a static, column-major matrix
+Eigen::MatrixXd &get_cm() {
+    static Eigen::MatrixXd *x;
+    if (!x) {
+        x = new Eigen::MatrixXd(3, 3);
+        reset_ref(*x);
+    }
+    return *x;
+}
+// Likewise, but row-major
+MatrixXdR &get_rm() {
+    static MatrixXdR *x;
+    if (!x) {
+        x = new MatrixXdR(3, 3);
+        reset_ref(*x);
+    }
+    return *x;
+}
+// Resets the values of the static matrices returned by get_cm()/get_rm()
+void reset_refs() {
+    reset_ref(get_cm());
+    reset_ref(get_rm());
+}
+
+// Returns element 2,1 from a matrix (used to test copy/nocopy)
+double get_elem(Eigen::Ref<const Eigen::MatrixXd> m) { return m(2, 1); };
+
+
+// Returns a matrix with 10*r + 100*c added to each matrix element (to help test that the matrix
+// reference is referencing rows/columns correctly).
+template <typename MatrixArgType> Eigen::MatrixXd adjust_matrix(MatrixArgType m) {
+    Eigen::MatrixXd ret(m);
+    for (int c = 0; c < m.cols(); c++) for (int r = 0; r < m.rows(); r++)
+        ret(r, c) += 10*r + 100*c;
+    return ret;
+}
+
+struct CustomOperatorNew {
+    CustomOperatorNew() = default;
+
+    Eigen::Matrix4d a = Eigen::Matrix4d::Zero();
+    Eigen::Matrix4d b = Eigen::Matrix4d::Identity();
+
+    EIGEN_MAKE_ALIGNED_OPERATOR_NEW;
+};
+
+TEST_SUBMODULE(eigen, m) {
+    using FixedMatrixR = Eigen::Matrix<float, 5, 6, Eigen::RowMajor>;
+    using FixedMatrixC = Eigen::Matrix<float, 5, 6>;
+    using DenseMatrixR = Eigen::Matrix<float, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>;
+    using DenseMatrixC = Eigen::Matrix<float, Eigen::Dynamic, Eigen::Dynamic>;
+    using FourRowMatrixC = Eigen::Matrix<float, 4, Eigen::Dynamic>;
+    using FourColMatrixC = Eigen::Matrix<float, Eigen::Dynamic, 4>;
+    using FourRowMatrixR = Eigen::Matrix<float, 4, Eigen::Dynamic>;
+    using FourColMatrixR = Eigen::Matrix<float, Eigen::Dynamic, 4>;
+    using SparseMatrixR = Eigen::SparseMatrix<float, Eigen::RowMajor>;
+    using SparseMatrixC = Eigen::SparseMatrix<float>;
+
+    m.attr("have_eigen") = true;
+
+    // various tests
+    m.def("double_col", [](const Eigen::VectorXf &x) -> Eigen::VectorXf { return 2.0f * x; });
+    m.def("double_row", [](const Eigen::RowVectorXf &x) -> Eigen::RowVectorXf { return 2.0f * x; });
+    m.def("double_complex", [](const Eigen::VectorXcf &x) -> Eigen::VectorXcf { return 2.0f * x; });
+    m.def("double_threec", [](py::EigenDRef<Eigen::Vector3f> x) { x *= 2; });
+    m.def("double_threer", [](py::EigenDRef<Eigen::RowVector3f> x) { x *= 2; });
+    m.def("double_mat_cm", [](Eigen::MatrixXf x) -> Eigen::MatrixXf { return 2.0f * x; });
+    m.def("double_mat_rm", [](DenseMatrixR x) -> DenseMatrixR { return 2.0f * x; });
+
+    // test_eigen_ref_to_python
+    // Different ways of passing via Eigen::Ref; the first and second are the Eigen-recommended
+    m.def("cholesky1", [](Eigen::Ref<MatrixXdR> x) -> Eigen::MatrixXd { return x.llt().matrixL(); });
+    m.def("cholesky2", [](const Eigen::Ref<const MatrixXdR> &x) -> Eigen::MatrixXd { return x.llt().matrixL(); });
+    m.def("cholesky3", [](const Eigen::Ref<MatrixXdR> &x) -> Eigen::MatrixXd { return x.llt().matrixL(); });
+    m.def("cholesky4", [](Eigen::Ref<const MatrixXdR> x) -> Eigen::MatrixXd { return x.llt().matrixL(); });
+
+    // test_eigen_ref_mutators
+    // Mutators: these add some value to the given element using Eigen, but Eigen should be mapping into
+    // the numpy array data and so the result should show up there.  There are three versions: one that
+    // works on a contiguous-row matrix (numpy's default), one for a contiguous-column matrix, and one
+    // for any matrix.
+    auto add_rm = [](Eigen::Ref<MatrixXdR> x, int r, int c, double v) { x(r,c) += v; };
+    auto add_cm = [](Eigen::Ref<Eigen::MatrixXd> x, int r, int c, double v) { x(r,c) += v; };
+
+    // Mutators (Eigen maps into numpy variables):
+    m.def("add_rm", add_rm); // Only takes row-contiguous
+    m.def("add_cm", add_cm); // Only takes column-contiguous
+    // Overloaded versions that will accept either row or column contiguous:
+    m.def("add1", add_rm);
+    m.def("add1", add_cm);
+    m.def("add2", add_cm);
+    m.def("add2", add_rm);
+    // This one accepts a matrix of any stride:
+    m.def("add_any", [](py::EigenDRef<Eigen::MatrixXd> x, int r, int c, double v) { x(r,c) += v; });
+
+    // Return mutable references (numpy maps into eigen variables)
+    m.def("get_cm_ref", []() { return Eigen::Ref<Eigen::MatrixXd>(get_cm()); });
+    m.def("get_rm_ref", []() { return Eigen::Ref<MatrixXdR>(get_rm()); });
+    // The same references, but non-mutable (numpy maps into eigen variables, but is !writeable)
+    m.def("get_cm_const_ref", []() { return Eigen::Ref<const Eigen::MatrixXd>(get_cm()); });
+    m.def("get_rm_const_ref", []() { return Eigen::Ref<const MatrixXdR>(get_rm()); });
+
+    m.def("reset_refs", reset_refs); // Restores get_{cm,rm}_ref to original values
+
+    // Increments and returns ref to (same) matrix
+    m.def("incr_matrix", [](Eigen::Ref<Eigen::MatrixXd> m, double v) {
+        m += Eigen::MatrixXd::Constant(m.rows(), m.cols(), v);
+        return m;
+    }, py::return_value_policy::reference);
+
+    // Same, but accepts a matrix of any strides
+    m.def("incr_matrix_any", [](py::EigenDRef<Eigen::MatrixXd> m, double v) {
+        m += Eigen::MatrixXd::Constant(m.rows(), m.cols(), v);
+        return m;
+    }, py::return_value_policy::reference);
+
+    // Returns an eigen slice of even rows
+    m.def("even_rows", [](py::EigenDRef<Eigen::MatrixXd> m) {
+        return py::EigenDMap<Eigen::MatrixXd>(
+                m.data(), (m.rows() + 1) / 2, m.cols(),
+                py::EigenDStride(m.outerStride(), 2 * m.innerStride()));
+    }, py::return_value_policy::reference);
+
+    // Returns an eigen slice of even columns
+    m.def("even_cols", [](py::EigenDRef<Eigen::MatrixXd> m) {
+        return py::EigenDMap<Eigen::MatrixXd>(
+                m.data(), m.rows(), (m.cols() + 1) / 2,
+                py::EigenDStride(2 * m.outerStride(), m.innerStride()));
+    }, py::return_value_policy::reference);
+
+    // Returns diagonals: a vector-like object with an inner stride != 1
+    m.def("diagonal", [](const Eigen::Ref<const Eigen::MatrixXd> &x) { return x.diagonal(); });
+    m.def("diagonal_1", [](const Eigen::Ref<const Eigen::MatrixXd> &x) { return x.diagonal<1>(); });
+    m.def("diagonal_n", [](const Eigen::Ref<const Eigen::MatrixXd> &x, int index) { return x.diagonal(index); });
+
+    // Return a block of a matrix (gives non-standard strides)
+    m.def("block", [](const Eigen::Ref<const Eigen::MatrixXd> &x, int start_row, int start_col, int block_rows, int block_cols) {
+        return x.block(start_row, start_col, block_rows, block_cols);
+    });
+
+    // test_eigen_return_references, test_eigen_keepalive
+    // return value referencing/copying tests:
+    class ReturnTester {
+        Eigen::MatrixXd mat = create();
+    public:
+        ReturnTester() { print_created(this); }
+        ~ReturnTester() { print_destroyed(this); }
+        static Eigen::MatrixXd create() { return Eigen::MatrixXd::Ones(10, 10); }
+        static const Eigen::MatrixXd createConst() { return Eigen::MatrixXd::Ones(10, 10); }
+        Eigen::MatrixXd &get() { return mat; }
+        Eigen::MatrixXd *getPtr() { return &mat; }
+        const Eigen::MatrixXd &view() { return mat; }
+        const Eigen::MatrixXd *viewPtr() { return &mat; }
+        Eigen::Ref<Eigen::MatrixXd> ref() { return mat; }
+        Eigen::Ref<const Eigen::MatrixXd> refConst() { return mat; }
+        Eigen::Block<Eigen::MatrixXd> block(int r, int c, int nrow, int ncol) { return mat.block(r, c, nrow, ncol); }
+        Eigen::Block<const Eigen::MatrixXd> blockConst(int r, int c, int nrow, int ncol) const { return mat.block(r, c, nrow, ncol); }
+        py::EigenDMap<Eigen::Matrix2d> corners() { return py::EigenDMap<Eigen::Matrix2d>(mat.data(),
+                    py::EigenDStride(mat.outerStride() * (mat.outerSize()-1), mat.innerStride() * (mat.innerSize()-1))); }
+        py::EigenDMap<const Eigen::Matrix2d> cornersConst() const { return py::EigenDMap<const Eigen::Matrix2d>(mat.data(),
+                    py::EigenDStride(mat.outerStride() * (mat.outerSize()-1), mat.innerStride() * (mat.innerSize()-1))); }
+    };
+    using rvp = py::return_value_policy;
+    py::class_<ReturnTester>(m, "ReturnTester")
+        .def(py::init<>())
+        .def_static("create", &ReturnTester::create)
+        .def_static("create_const", &ReturnTester::createConst)
+        .def("get", &ReturnTester::get, rvp::reference_internal)
+        .def("get_ptr", &ReturnTester::getPtr, rvp::reference_internal)
+        .def("view", &ReturnTester::view, rvp::reference_internal)
+        .def("view_ptr", &ReturnTester::view, rvp::reference_internal)
+        .def("copy_get", &ReturnTester::get)   // Default rvp: copy
+        .def("copy_view", &ReturnTester::view) //         "
+        .def("ref", &ReturnTester::ref) // Default for Ref is to reference
+        .def("ref_const", &ReturnTester::refConst) // Likewise, but const
+        .def("ref_safe", &ReturnTester::ref, rvp::reference_internal)
+        .def("ref_const_safe", &ReturnTester::refConst, rvp::reference_internal)
+        .def("copy_ref", &ReturnTester::ref, rvp::copy)
+        .def("copy_ref_const", &ReturnTester::refConst, rvp::copy)
+        .def("block", &ReturnTester::block)
+        .def("block_safe", &ReturnTester::block, rvp::reference_internal)
+        .def("block_const", &ReturnTester::blockConst, rvp::reference_internal)
+        .def("copy_block", &ReturnTester::block, rvp::copy)
+        .def("corners", &ReturnTester::corners, rvp::reference_internal)
+        .def("corners_const", &ReturnTester::cornersConst, rvp::reference_internal)
+        ;
+
+    // test_special_matrix_objects
+    // Returns a DiagonalMatrix with diagonal (1,2,3,...)
+    m.def("incr_diag", [](int k) {
+        Eigen::DiagonalMatrix<int, Eigen::Dynamic> m(k);
+        for (int i = 0; i < k; i++) m.diagonal()[i] = i+1;
+        return m;
+    });
+
+    // Returns a SelfAdjointView referencing the lower triangle of m
+    m.def("symmetric_lower", [](const Eigen::MatrixXi &m) {
+            return m.selfadjointView<Eigen::Lower>();
+    });
+    // Returns a SelfAdjointView referencing the lower triangle of m
+    m.def("symmetric_upper", [](const Eigen::MatrixXi &m) {
+            return m.selfadjointView<Eigen::Upper>();
+    });
+
+    // Test matrix for various functions below.
+    Eigen::MatrixXf mat(5, 6);
+    mat << 0,  3,  0,  0,  0, 11,
+           22, 0,  0,  0, 17, 11,
+           7,  5,  0,  1,  0, 11,
+           0,  0,  0,  0,  0, 11,
+           0,  0, 14,  0,  8, 11;
+
+    // test_fixed, and various other tests
+    m.def("fixed_r", [mat]() -> FixedMatrixR { return FixedMatrixR(mat); });
+    m.def("fixed_r_const", [mat]() -> const FixedMatrixR { return FixedMatrixR(mat); });
+    m.def("fixed_c", [mat]() -> FixedMatrixC { return FixedMatrixC(mat); });
+    m.def("fixed_copy_r", [](const FixedMatrixR &m) -> FixedMatrixR { return m; });
+    m.def("fixed_copy_c", [](const FixedMatrixC &m) -> FixedMatrixC { return m; });
+    // test_mutator_descriptors
+    m.def("fixed_mutator_r", [](Eigen::Ref<FixedMatrixR>) {});
+    m.def("fixed_mutator_c", [](Eigen::Ref<FixedMatrixC>) {});
+    m.def("fixed_mutator_a", [](py::EigenDRef<FixedMatrixC>) {});
+    // test_dense
+    m.def("dense_r", [mat]() -> DenseMatrixR { return DenseMatrixR(mat); });
+    m.def("dense_c", [mat]() -> DenseMatrixC { return DenseMatrixC(mat); });
+    m.def("dense_copy_r", [](const DenseMatrixR &m) -> DenseMatrixR { return m; });
+    m.def("dense_copy_c", [](const DenseMatrixC &m) -> DenseMatrixC { return m; });
+    // test_sparse, test_sparse_signature
+    m.def("sparse_r", [mat]() -> SparseMatrixR { return Eigen::SparseView<Eigen::MatrixXf>(mat); });
+    m.def("sparse_c", [mat]() -> SparseMatrixC { return Eigen::SparseView<Eigen::MatrixXf>(mat); });
+    m.def("sparse_copy_r", [](const SparseMatrixR &m) -> SparseMatrixR { return m; });
+    m.def("sparse_copy_c", [](const SparseMatrixC &m) -> SparseMatrixC { return m; });
+    // test_partially_fixed
+    m.def("partial_copy_four_rm_r", [](const FourRowMatrixR &m) -> FourRowMatrixR { return m; });
+    m.def("partial_copy_four_rm_c", [](const FourColMatrixR &m) -> FourColMatrixR { return m; });
+    m.def("partial_copy_four_cm_r", [](const FourRowMatrixC &m) -> FourRowMatrixC { return m; });
+    m.def("partial_copy_four_cm_c", [](const FourColMatrixC &m) -> FourColMatrixC { return m; });
+
+    // test_cpp_casting
+    // Test that we can cast a numpy object to a Eigen::MatrixXd explicitly
+    m.def("cpp_copy", [](py::handle m) { return m.cast<Eigen::MatrixXd>()(1, 0); });
+    m.def("cpp_ref_c", [](py::handle m) { return m.cast<Eigen::Ref<Eigen::MatrixXd>>()(1, 0); });
+    m.def("cpp_ref_r", [](py::handle m) { return m.cast<Eigen::Ref<MatrixXdR>>()(1, 0); });
+    m.def("cpp_ref_any", [](py::handle m) { return m.cast<py::EigenDRef<Eigen::MatrixXd>>()(1, 0); });
+
+
+    // test_nocopy_wrapper
+    // Test that we can prevent copying into an argument that would normally copy: First a version
+    // that would allow copying (if types or strides don't match) for comparison:
+    m.def("get_elem", &get_elem);
+    // Now this alternative that calls the tells pybind to fail rather than copy:
+    m.def("get_elem_nocopy", [](Eigen::Ref<const Eigen::MatrixXd> m) -> double { return get_elem(m); },
+            py::arg().noconvert());
+    // Also test a row-major-only no-copy const ref:
+    m.def("get_elem_rm_nocopy", [](Eigen::Ref<const Eigen::Matrix<long, -1, -1, Eigen::RowMajor>> &m) -> long { return m(2, 1); },
+            py::arg().noconvert());
+
+    // test_issue738
+    // Issue #738: 1xN or Nx1 2D matrices were neither accepted nor properly copied with an
+    // incompatible stride value on the length-1 dimension--but that should be allowed (without
+    // requiring a copy!) because the stride value can be safely ignored on a size-1 dimension.
+    m.def("iss738_f1", &adjust_matrix<const Eigen::Ref<const Eigen::MatrixXd> &>, py::arg().noconvert());
+    m.def("iss738_f2", &adjust_matrix<const Eigen::Ref<const Eigen::Matrix<double, -1, -1, Eigen::RowMajor>> &>, py::arg().noconvert());
+
+    // test_issue1105
+    // Issue #1105: when converting from a numpy two-dimensional (Nx1) or (1xN) value into a dense
+    // eigen Vector or RowVector, the argument would fail to load because the numpy copy would fail:
+    // numpy won't broadcast a Nx1 into a 1-dimensional vector.
+    m.def("iss1105_col", [](Eigen::VectorXd) { return true; });
+    m.def("iss1105_row", [](Eigen::RowVectorXd) { return true; });
+
+    // test_named_arguments
+    // Make sure named arguments are working properly:
+    m.def("matrix_multiply", [](const py::EigenDRef<const Eigen::MatrixXd> A, const py::EigenDRef<const Eigen::MatrixXd> B)
+            -> Eigen::MatrixXd {
+        if (A.cols() != B.rows()) throw std::domain_error("Nonconformable matrices!");
+        return A * B;
+    }, py::arg("A"), py::arg("B"));
+
+    // test_custom_operator_new
+    py::class_<CustomOperatorNew>(m, "CustomOperatorNew")
+        .def(py::init<>())
+        .def_readonly("a", &CustomOperatorNew::a)
+        .def_readonly("b", &CustomOperatorNew::b);
+
+    // test_eigen_ref_life_support
+    // In case of a failure (the caster's temp array does not live long enough), creating
+    // a new array (np.ones(10)) increases the chances that the temp array will be garbage
+    // collected and/or that its memory will be overridden with different values.
+    m.def("get_elem_direct", [](Eigen::Ref<const Eigen::VectorXd> v) {
+        py::module::import("numpy").attr("ones")(10);
+        return v(5);
+    });
+    m.def("get_elem_indirect", [](std::vector<Eigen::Ref<const Eigen::VectorXd>> v) {
+        py::module::import("numpy").attr("ones")(10);
+        return v[0](5);
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_eigen.py b/3rdparty/pybind11/tests/test_eigen.py
new file mode 100644
index 00000000..55d93517
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_eigen.py
@@ -0,0 +1,694 @@
+import pytest
+from pybind11_tests import ConstructorStats
+
+pytestmark = pytest.requires_eigen_and_numpy
+
+with pytest.suppress(ImportError):
+    from pybind11_tests import eigen as m
+    import numpy as np
+
+    ref = np.array([[ 0.,  3,  0,  0,  0, 11],
+                    [22,  0,  0,  0, 17, 11],
+                    [ 7,  5,  0,  1,  0, 11],
+                    [ 0,  0,  0,  0,  0, 11],
+                    [ 0,  0, 14,  0,  8, 11]])
+
+
+def assert_equal_ref(mat):
+    np.testing.assert_array_equal(mat, ref)
+
+
+def assert_sparse_equal_ref(sparse_mat):
+    assert_equal_ref(sparse_mat.toarray())
+
+
+def test_fixed():
+    assert_equal_ref(m.fixed_c())
+    assert_equal_ref(m.fixed_r())
+    assert_equal_ref(m.fixed_copy_r(m.fixed_r()))
+    assert_equal_ref(m.fixed_copy_c(m.fixed_c()))
+    assert_equal_ref(m.fixed_copy_r(m.fixed_c()))
+    assert_equal_ref(m.fixed_copy_c(m.fixed_r()))
+
+
+def test_dense():
+    assert_equal_ref(m.dense_r())
+    assert_equal_ref(m.dense_c())
+    assert_equal_ref(m.dense_copy_r(m.dense_r()))
+    assert_equal_ref(m.dense_copy_c(m.dense_c()))
+    assert_equal_ref(m.dense_copy_r(m.dense_c()))
+    assert_equal_ref(m.dense_copy_c(m.dense_r()))
+
+
+def test_partially_fixed():
+    ref2 = np.array([[0., 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15]])
+    np.testing.assert_array_equal(m.partial_copy_four_rm_r(ref2), ref2)
+    np.testing.assert_array_equal(m.partial_copy_four_rm_c(ref2), ref2)
+    np.testing.assert_array_equal(m.partial_copy_four_rm_r(ref2[:, 1]), ref2[:, [1]])
+    np.testing.assert_array_equal(m.partial_copy_four_rm_c(ref2[0, :]), ref2[[0], :])
+    np.testing.assert_array_equal(m.partial_copy_four_rm_r(ref2[:, (0, 2)]), ref2[:, (0, 2)])
+    np.testing.assert_array_equal(
+        m.partial_copy_four_rm_c(ref2[(3, 1, 2), :]), ref2[(3, 1, 2), :])
+
+    np.testing.assert_array_equal(m.partial_copy_four_cm_r(ref2), ref2)
+    np.testing.assert_array_equal(m.partial_copy_four_cm_c(ref2), ref2)
+    np.testing.assert_array_equal(m.partial_copy_four_cm_r(ref2[:, 1]), ref2[:, [1]])
+    np.testing.assert_array_equal(m.partial_copy_four_cm_c(ref2[0, :]), ref2[[0], :])
+    np.testing.assert_array_equal(m.partial_copy_four_cm_r(ref2[:, (0, 2)]), ref2[:, (0, 2)])
+    np.testing.assert_array_equal(
+        m.partial_copy_four_cm_c(ref2[(3, 1, 2), :]), ref2[(3, 1, 2), :])
+
+    # TypeError should be raise for a shape mismatch
+    functions = [m.partial_copy_four_rm_r, m.partial_copy_four_rm_c,
+                 m.partial_copy_four_cm_r, m.partial_copy_four_cm_c]
+    matrix_with_wrong_shape = [[1, 2],
+                               [3, 4]]
+    for f in functions:
+        with pytest.raises(TypeError) as excinfo:
+            f(matrix_with_wrong_shape)
+        assert "incompatible function arguments" in str(excinfo.value)
+
+
+def test_mutator_descriptors():
+    zr = np.arange(30, dtype='float32').reshape(5, 6)  # row-major
+    zc = zr.reshape(6, 5).transpose()  # column-major
+
+    m.fixed_mutator_r(zr)
+    m.fixed_mutator_c(zc)
+    m.fixed_mutator_a(zr)
+    m.fixed_mutator_a(zc)
+    with pytest.raises(TypeError) as excinfo:
+        m.fixed_mutator_r(zc)
+    assert ('(arg0: numpy.ndarray[float32[5, 6], flags.writeable, flags.c_contiguous]) -> None'
+            in str(excinfo.value))
+    with pytest.raises(TypeError) as excinfo:
+        m.fixed_mutator_c(zr)
+    assert ('(arg0: numpy.ndarray[float32[5, 6], flags.writeable, flags.f_contiguous]) -> None'
+            in str(excinfo.value))
+    with pytest.raises(TypeError) as excinfo:
+        m.fixed_mutator_a(np.array([[1, 2], [3, 4]], dtype='float32'))
+    assert ('(arg0: numpy.ndarray[float32[5, 6], flags.writeable]) -> None'
+            in str(excinfo.value))
+    zr.flags.writeable = False
+    with pytest.raises(TypeError):
+        m.fixed_mutator_r(zr)
+    with pytest.raises(TypeError):
+        m.fixed_mutator_a(zr)
+
+
+def test_cpp_casting():
+    assert m.cpp_copy(m.fixed_r()) == 22.
+    assert m.cpp_copy(m.fixed_c()) == 22.
+    z = np.array([[5., 6], [7, 8]])
+    assert m.cpp_copy(z) == 7.
+    assert m.cpp_copy(m.get_cm_ref()) == 21.
+    assert m.cpp_copy(m.get_rm_ref()) == 21.
+    assert m.cpp_ref_c(m.get_cm_ref()) == 21.
+    assert m.cpp_ref_r(m.get_rm_ref()) == 21.
+    with pytest.raises(RuntimeError) as excinfo:
+        # Can't reference m.fixed_c: it contains floats, m.cpp_ref_any wants doubles
+        m.cpp_ref_any(m.fixed_c())
+    assert 'Unable to cast Python instance' in str(excinfo.value)
+    with pytest.raises(RuntimeError) as excinfo:
+        # Can't reference m.fixed_r: it contains floats, m.cpp_ref_any wants doubles
+        m.cpp_ref_any(m.fixed_r())
+    assert 'Unable to cast Python instance' in str(excinfo.value)
+    assert m.cpp_ref_any(m.ReturnTester.create()) == 1.
+
+    assert m.cpp_ref_any(m.get_cm_ref()) == 21.
+    assert m.cpp_ref_any(m.get_cm_ref()) == 21.
+
+
+def test_pass_readonly_array():
+    z = np.full((5, 6), 42.0)
+    z.flags.writeable = False
+    np.testing.assert_array_equal(z, m.fixed_copy_r(z))
+    np.testing.assert_array_equal(m.fixed_r_const(), m.fixed_r())
+    assert not m.fixed_r_const().flags.writeable
+    np.testing.assert_array_equal(m.fixed_copy_r(m.fixed_r_const()), m.fixed_r_const())
+
+
+def test_nonunit_stride_from_python():
+    counting_mat = np.arange(9.0, dtype=np.float32).reshape((3, 3))
+    second_row = counting_mat[1, :]
+    second_col = counting_mat[:, 1]
+    np.testing.assert_array_equal(m.double_row(second_row), 2.0 * second_row)
+    np.testing.assert_array_equal(m.double_col(second_row), 2.0 * second_row)
+    np.testing.assert_array_equal(m.double_complex(second_row), 2.0 * second_row)
+    np.testing.assert_array_equal(m.double_row(second_col), 2.0 * second_col)
+    np.testing.assert_array_equal(m.double_col(second_col), 2.0 * second_col)
+    np.testing.assert_array_equal(m.double_complex(second_col), 2.0 * second_col)
+
+    counting_3d = np.arange(27.0, dtype=np.float32).reshape((3, 3, 3))
+    slices = [counting_3d[0, :, :], counting_3d[:, 0, :], counting_3d[:, :, 0]]
+    for slice_idx, ref_mat in enumerate(slices):
+        np.testing.assert_array_equal(m.double_mat_cm(ref_mat), 2.0 * ref_mat)
+        np.testing.assert_array_equal(m.double_mat_rm(ref_mat), 2.0 * ref_mat)
+
+    # Mutator:
+    m.double_threer(second_row)
+    m.double_threec(second_col)
+    np.testing.assert_array_equal(counting_mat, [[0., 2, 2], [6, 16, 10], [6, 14, 8]])
+
+
+def test_negative_stride_from_python(msg):
+    """Eigen doesn't support (as of yet) negative strides. When a function takes an Eigen matrix by
+    copy or const reference, we can pass a numpy array that has negative strides.  Otherwise, an
+    exception will be thrown as Eigen will not be able to map the numpy array."""
+
+    counting_mat = np.arange(9.0, dtype=np.float32).reshape((3, 3))
+    counting_mat = counting_mat[::-1, ::-1]
+    second_row = counting_mat[1, :]
+    second_col = counting_mat[:, 1]
+    np.testing.assert_array_equal(m.double_row(second_row), 2.0 * second_row)
+    np.testing.assert_array_equal(m.double_col(second_row), 2.0 * second_row)
+    np.testing.assert_array_equal(m.double_complex(second_row), 2.0 * second_row)
+    np.testing.assert_array_equal(m.double_row(second_col), 2.0 * second_col)
+    np.testing.assert_array_equal(m.double_col(second_col), 2.0 * second_col)
+    np.testing.assert_array_equal(m.double_complex(second_col), 2.0 * second_col)
+
+    counting_3d = np.arange(27.0, dtype=np.float32).reshape((3, 3, 3))
+    counting_3d = counting_3d[::-1, ::-1, ::-1]
+    slices = [counting_3d[0, :, :], counting_3d[:, 0, :], counting_3d[:, :, 0]]
+    for slice_idx, ref_mat in enumerate(slices):
+        np.testing.assert_array_equal(m.double_mat_cm(ref_mat), 2.0 * ref_mat)
+        np.testing.assert_array_equal(m.double_mat_rm(ref_mat), 2.0 * ref_mat)
+
+    # Mutator:
+    with pytest.raises(TypeError) as excinfo:
+        m.double_threer(second_row)
+    assert msg(excinfo.value) == """
+        double_threer(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: numpy.ndarray[float32[1, 3], flags.writeable]) -> None
+
+        Invoked with: """ + repr(np.array([ 5.,  4.,  3.], dtype='float32'))  # noqa: E501 line too long
+
+    with pytest.raises(TypeError) as excinfo:
+        m.double_threec(second_col)
+    assert msg(excinfo.value) == """
+        double_threec(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: numpy.ndarray[float32[3, 1], flags.writeable]) -> None
+
+        Invoked with: """ + repr(np.array([ 7.,  4.,  1.], dtype='float32'))  # noqa: E501 line too long
+
+
+def test_nonunit_stride_to_python():
+    assert np.all(m.diagonal(ref) == ref.diagonal())
+    assert np.all(m.diagonal_1(ref) == ref.diagonal(1))
+    for i in range(-5, 7):
+        assert np.all(m.diagonal_n(ref, i) == ref.diagonal(i)), "m.diagonal_n({})".format(i)
+
+    assert np.all(m.block(ref, 2, 1, 3, 3) == ref[2:5, 1:4])
+    assert np.all(m.block(ref, 1, 4, 4, 2) == ref[1:, 4:])
+    assert np.all(m.block(ref, 1, 4, 3, 2) == ref[1:4, 4:])
+
+
+def test_eigen_ref_to_python():
+    chols = [m.cholesky1, m.cholesky2, m.cholesky3, m.cholesky4]
+    for i, chol in enumerate(chols, start=1):
+        mymat = chol(np.array([[1., 2, 4], [2, 13, 23], [4, 23, 77]]))
+        assert np.all(mymat == np.array([[1, 0, 0], [2, 3, 0], [4, 5, 6]])), "cholesky{}".format(i)
+
+
+def assign_both(a1, a2, r, c, v):
+    a1[r, c] = v
+    a2[r, c] = v
+
+
+def array_copy_but_one(a, r, c, v):
+    z = np.array(a, copy=True)
+    z[r, c] = v
+    return z
+
+
+def test_eigen_return_references():
+    """Tests various ways of returning references and non-referencing copies"""
+
+    master = np.ones((10, 10))
+    a = m.ReturnTester()
+    a_get1 = a.get()
+    assert not a_get1.flags.owndata and a_get1.flags.writeable
+    assign_both(a_get1, master, 3, 3, 5)
+    a_get2 = a.get_ptr()
+    assert not a_get2.flags.owndata and a_get2.flags.writeable
+    assign_both(a_get1, master, 2, 3, 6)
+
+    a_view1 = a.view()
+    assert not a_view1.flags.owndata and not a_view1.flags.writeable
+    with pytest.raises(ValueError):
+        a_view1[2, 3] = 4
+    a_view2 = a.view_ptr()
+    assert not a_view2.flags.owndata and not a_view2.flags.writeable
+    with pytest.raises(ValueError):
+        a_view2[2, 3] = 4
+
+    a_copy1 = a.copy_get()
+    assert a_copy1.flags.owndata and a_copy1.flags.writeable
+    np.testing.assert_array_equal(a_copy1, master)
+    a_copy1[7, 7] = -44  # Shouldn't affect anything else
+    c1want = array_copy_but_one(master, 7, 7, -44)
+    a_copy2 = a.copy_view()
+    assert a_copy2.flags.owndata and a_copy2.flags.writeable
+    np.testing.assert_array_equal(a_copy2, master)
+    a_copy2[4, 4] = -22  # Shouldn't affect anything else
+    c2want = array_copy_but_one(master, 4, 4, -22)
+
+    a_ref1 = a.ref()
+    assert not a_ref1.flags.owndata and a_ref1.flags.writeable
+    assign_both(a_ref1, master, 1, 1, 15)
+    a_ref2 = a.ref_const()
+    assert not a_ref2.flags.owndata and not a_ref2.flags.writeable
+    with pytest.raises(ValueError):
+        a_ref2[5, 5] = 33
+    a_ref3 = a.ref_safe()
+    assert not a_ref3.flags.owndata and a_ref3.flags.writeable
+    assign_both(a_ref3, master, 0, 7, 99)
+    a_ref4 = a.ref_const_safe()
+    assert not a_ref4.flags.owndata and not a_ref4.flags.writeable
+    with pytest.raises(ValueError):
+        a_ref4[7, 0] = 987654321
+
+    a_copy3 = a.copy_ref()
+    assert a_copy3.flags.owndata and a_copy3.flags.writeable
+    np.testing.assert_array_equal(a_copy3, master)
+    a_copy3[8, 1] = 11
+    c3want = array_copy_but_one(master, 8, 1, 11)
+    a_copy4 = a.copy_ref_const()
+    assert a_copy4.flags.owndata and a_copy4.flags.writeable
+    np.testing.assert_array_equal(a_copy4, master)
+    a_copy4[8, 4] = 88
+    c4want = array_copy_but_one(master, 8, 4, 88)
+
+    a_block1 = a.block(3, 3, 2, 2)
+    assert not a_block1.flags.owndata and a_block1.flags.writeable
+    a_block1[0, 0] = 55
+    master[3, 3] = 55
+    a_block2 = a.block_safe(2, 2, 3, 2)
+    assert not a_block2.flags.owndata and a_block2.flags.writeable
+    a_block2[2, 1] = -123
+    master[4, 3] = -123
+    a_block3 = a.block_const(6, 7, 4, 3)
+    assert not a_block3.flags.owndata and not a_block3.flags.writeable
+    with pytest.raises(ValueError):
+        a_block3[2, 2] = -44444
+
+    a_copy5 = a.copy_block(2, 2, 2, 3)
+    assert a_copy5.flags.owndata and a_copy5.flags.writeable
+    np.testing.assert_array_equal(a_copy5, master[2:4, 2:5])
+    a_copy5[1, 1] = 777
+    c5want = array_copy_but_one(master[2:4, 2:5], 1, 1, 777)
+
+    a_corn1 = a.corners()
+    assert not a_corn1.flags.owndata and a_corn1.flags.writeable
+    a_corn1 *= 50
+    a_corn1[1, 1] = 999
+    master[0, 0] = 50
+    master[0, 9] = 50
+    master[9, 0] = 50
+    master[9, 9] = 999
+    a_corn2 = a.corners_const()
+    assert not a_corn2.flags.owndata and not a_corn2.flags.writeable
+    with pytest.raises(ValueError):
+        a_corn2[1, 0] = 51
+
+    # All of the changes made all the way along should be visible everywhere
+    # now (except for the copies, of course)
+    np.testing.assert_array_equal(a_get1, master)
+    np.testing.assert_array_equal(a_get2, master)
+    np.testing.assert_array_equal(a_view1, master)
+    np.testing.assert_array_equal(a_view2, master)
+    np.testing.assert_array_equal(a_ref1, master)
+    np.testing.assert_array_equal(a_ref2, master)
+    np.testing.assert_array_equal(a_ref3, master)
+    np.testing.assert_array_equal(a_ref4, master)
+    np.testing.assert_array_equal(a_block1, master[3:5, 3:5])
+    np.testing.assert_array_equal(a_block2, master[2:5, 2:4])
+    np.testing.assert_array_equal(a_block3, master[6:10, 7:10])
+    np.testing.assert_array_equal(a_corn1, master[0::master.shape[0] - 1, 0::master.shape[1] - 1])
+    np.testing.assert_array_equal(a_corn2, master[0::master.shape[0] - 1, 0::master.shape[1] - 1])
+
+    np.testing.assert_array_equal(a_copy1, c1want)
+    np.testing.assert_array_equal(a_copy2, c2want)
+    np.testing.assert_array_equal(a_copy3, c3want)
+    np.testing.assert_array_equal(a_copy4, c4want)
+    np.testing.assert_array_equal(a_copy5, c5want)
+
+
+def assert_keeps_alive(cl, method, *args):
+    cstats = ConstructorStats.get(cl)
+    start_with = cstats.alive()
+    a = cl()
+    assert cstats.alive() == start_with + 1
+    z = method(a, *args)
+    assert cstats.alive() == start_with + 1
+    del a
+    # Here's the keep alive in action:
+    assert cstats.alive() == start_with + 1
+    del z
+    # Keep alive should have expired:
+    assert cstats.alive() == start_with
+
+
+def test_eigen_keepalive():
+    a = m.ReturnTester()
+    cstats = ConstructorStats.get(m.ReturnTester)
+    assert cstats.alive() == 1
+    unsafe = [a.ref(), a.ref_const(), a.block(1, 2, 3, 4)]
+    copies = [a.copy_get(), a.copy_view(), a.copy_ref(), a.copy_ref_const(),
+              a.copy_block(4, 3, 2, 1)]
+    del a
+    assert cstats.alive() == 0
+    del unsafe
+    del copies
+
+    for meth in [m.ReturnTester.get, m.ReturnTester.get_ptr, m.ReturnTester.view,
+                 m.ReturnTester.view_ptr, m.ReturnTester.ref_safe, m.ReturnTester.ref_const_safe,
+                 m.ReturnTester.corners, m.ReturnTester.corners_const]:
+        assert_keeps_alive(m.ReturnTester, meth)
+
+    for meth in [m.ReturnTester.block_safe, m.ReturnTester.block_const]:
+        assert_keeps_alive(m.ReturnTester, meth, 4, 3, 2, 1)
+
+
+def test_eigen_ref_mutators():
+    """Tests Eigen's ability to mutate numpy values"""
+
+    orig = np.array([[1., 2, 3], [4, 5, 6], [7, 8, 9]])
+    zr = np.array(orig)
+    zc = np.array(orig, order='F')
+    m.add_rm(zr, 1, 0, 100)
+    assert np.all(zr == np.array([[1., 2, 3], [104, 5, 6], [7, 8, 9]]))
+    m.add_cm(zc, 1, 0, 200)
+    assert np.all(zc == np.array([[1., 2, 3], [204, 5, 6], [7, 8, 9]]))
+
+    m.add_any(zr, 1, 0, 20)
+    assert np.all(zr == np.array([[1., 2, 3], [124, 5, 6], [7, 8, 9]]))
+    m.add_any(zc, 1, 0, 10)
+    assert np.all(zc == np.array([[1., 2, 3], [214, 5, 6], [7, 8, 9]]))
+
+    # Can't reference a col-major array with a row-major Ref, and vice versa:
+    with pytest.raises(TypeError):
+        m.add_rm(zc, 1, 0, 1)
+    with pytest.raises(TypeError):
+        m.add_cm(zr, 1, 0, 1)
+
+    # Overloads:
+    m.add1(zr, 1, 0, -100)
+    m.add2(zr, 1, 0, -20)
+    assert np.all(zr == orig)
+    m.add1(zc, 1, 0, -200)
+    m.add2(zc, 1, 0, -10)
+    assert np.all(zc == orig)
+
+    # a non-contiguous slice (this won't work on either the row- or
+    # column-contiguous refs, but should work for the any)
+    cornersr = zr[0::2, 0::2]
+    cornersc = zc[0::2, 0::2]
+
+    assert np.all(cornersr == np.array([[1., 3], [7, 9]]))
+    assert np.all(cornersc == np.array([[1., 3], [7, 9]]))
+
+    with pytest.raises(TypeError):
+        m.add_rm(cornersr, 0, 1, 25)
+    with pytest.raises(TypeError):
+        m.add_cm(cornersr, 0, 1, 25)
+    with pytest.raises(TypeError):
+        m.add_rm(cornersc, 0, 1, 25)
+    with pytest.raises(TypeError):
+        m.add_cm(cornersc, 0, 1, 25)
+    m.add_any(cornersr, 0, 1, 25)
+    m.add_any(cornersc, 0, 1, 44)
+    assert np.all(zr == np.array([[1., 2, 28], [4, 5, 6], [7, 8, 9]]))
+    assert np.all(zc == np.array([[1., 2, 47], [4, 5, 6], [7, 8, 9]]))
+
+    # You shouldn't be allowed to pass a non-writeable array to a mutating Eigen method:
+    zro = zr[0:4, 0:4]
+    zro.flags.writeable = False
+    with pytest.raises(TypeError):
+        m.add_rm(zro, 0, 0, 0)
+    with pytest.raises(TypeError):
+        m.add_any(zro, 0, 0, 0)
+    with pytest.raises(TypeError):
+        m.add1(zro, 0, 0, 0)
+    with pytest.raises(TypeError):
+        m.add2(zro, 0, 0, 0)
+
+    # integer array shouldn't be passable to a double-matrix-accepting mutating func:
+    zi = np.array([[1, 2], [3, 4]])
+    with pytest.raises(TypeError):
+        m.add_rm(zi)
+
+
+def test_numpy_ref_mutators():
+    """Tests numpy mutating Eigen matrices (for returned Eigen::Ref<...>s)"""
+
+    m.reset_refs()  # In case another test already changed it
+
+    zc = m.get_cm_ref()
+    zcro = m.get_cm_const_ref()
+    zr = m.get_rm_ref()
+    zrro = m.get_rm_const_ref()
+
+    assert [zc[1, 2], zcro[1, 2], zr[1, 2], zrro[1, 2]] == [23] * 4
+
+    assert not zc.flags.owndata and zc.flags.writeable
+    assert not zr.flags.owndata and zr.flags.writeable
+    assert not zcro.flags.owndata and not zcro.flags.writeable
+    assert not zrro.flags.owndata and not zrro.flags.writeable
+
+    zc[1, 2] = 99
+    expect = np.array([[11., 12, 13], [21, 22, 99], [31, 32, 33]])
+    # We should have just changed zc, of course, but also zcro and the original eigen matrix
+    assert np.all(zc == expect)
+    assert np.all(zcro == expect)
+    assert np.all(m.get_cm_ref() == expect)
+
+    zr[1, 2] = 99
+    assert np.all(zr == expect)
+    assert np.all(zrro == expect)
+    assert np.all(m.get_rm_ref() == expect)
+
+    # Make sure the readonly ones are numpy-readonly:
+    with pytest.raises(ValueError):
+        zcro[1, 2] = 6
+    with pytest.raises(ValueError):
+        zrro[1, 2] = 6
+
+    # We should be able to explicitly copy like this (and since we're copying,
+    # the const should drop away)
+    y1 = np.array(m.get_cm_const_ref())
+
+    assert y1.flags.owndata and y1.flags.writeable
+    # We should get copies of the eigen data, which was modified above:
+    assert y1[1, 2] == 99
+    y1[1, 2] += 12
+    assert y1[1, 2] == 111
+    assert zc[1, 2] == 99  # Make sure we aren't referencing the original
+
+
+def test_both_ref_mutators():
+    """Tests a complex chain of nested eigen/numpy references"""
+
+    m.reset_refs()  # In case another test already changed it
+
+    z = m.get_cm_ref()  # numpy -> eigen
+    z[0, 2] -= 3
+    z2 = m.incr_matrix(z, 1)  # numpy -> eigen -> numpy -> eigen
+    z2[1, 1] += 6
+    z3 = m.incr_matrix(z, 2)  # (numpy -> eigen)^3
+    z3[2, 2] += -5
+    z4 = m.incr_matrix(z, 3)  # (numpy -> eigen)^4
+    z4[1, 1] -= 1
+    z5 = m.incr_matrix(z, 4)  # (numpy -> eigen)^5
+    z5[0, 0] = 0
+    assert np.all(z == z2)
+    assert np.all(z == z3)
+    assert np.all(z == z4)
+    assert np.all(z == z5)
+    expect = np.array([[0., 22, 20], [31, 37, 33], [41, 42, 38]])
+    assert np.all(z == expect)
+
+    y = np.array(range(100), dtype='float64').reshape(10, 10)
+    y2 = m.incr_matrix_any(y, 10)  # np -> eigen -> np
+    y3 = m.incr_matrix_any(y2[0::2, 0::2], -33)  # np -> eigen -> np slice -> np -> eigen -> np
+    y4 = m.even_rows(y3)  # numpy -> eigen slice -> (... y3)
+    y5 = m.even_cols(y4)  # numpy -> eigen slice -> (... y4)
+    y6 = m.incr_matrix_any(y5, 1000)  # numpy -> eigen -> (... y5)
+
+    # Apply same mutations using just numpy:
+    yexpect = np.array(range(100), dtype='float64').reshape(10, 10)
+    yexpect += 10
+    yexpect[0::2, 0::2] -= 33
+    yexpect[0::4, 0::4] += 1000
+    assert np.all(y6 == yexpect[0::4, 0::4])
+    assert np.all(y5 == yexpect[0::4, 0::4])
+    assert np.all(y4 == yexpect[0::4, 0::2])
+    assert np.all(y3 == yexpect[0::2, 0::2])
+    assert np.all(y2 == yexpect)
+    assert np.all(y == yexpect)
+
+
+def test_nocopy_wrapper():
+    # get_elem requires a column-contiguous matrix reference, but should be
+    # callable with other types of matrix (via copying):
+    int_matrix_colmajor = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]], order='F')
+    dbl_matrix_colmajor = np.array(int_matrix_colmajor, dtype='double', order='F', copy=True)
+    int_matrix_rowmajor = np.array(int_matrix_colmajor, order='C', copy=True)
+    dbl_matrix_rowmajor = np.array(int_matrix_rowmajor, dtype='double', order='C', copy=True)
+
+    # All should be callable via get_elem:
+    assert m.get_elem(int_matrix_colmajor) == 8
+    assert m.get_elem(dbl_matrix_colmajor) == 8
+    assert m.get_elem(int_matrix_rowmajor) == 8
+    assert m.get_elem(dbl_matrix_rowmajor) == 8
+
+    # All but the second should fail with m.get_elem_nocopy:
+    with pytest.raises(TypeError) as excinfo:
+        m.get_elem_nocopy(int_matrix_colmajor)
+    assert ('get_elem_nocopy(): incompatible function arguments.' in str(excinfo.value) and
+            ', flags.f_contiguous' in str(excinfo.value))
+    assert m.get_elem_nocopy(dbl_matrix_colmajor) == 8
+    with pytest.raises(TypeError) as excinfo:
+        m.get_elem_nocopy(int_matrix_rowmajor)
+    assert ('get_elem_nocopy(): incompatible function arguments.' in str(excinfo.value) and
+            ', flags.f_contiguous' in str(excinfo.value))
+    with pytest.raises(TypeError) as excinfo:
+        m.get_elem_nocopy(dbl_matrix_rowmajor)
+    assert ('get_elem_nocopy(): incompatible function arguments.' in str(excinfo.value) and
+            ', flags.f_contiguous' in str(excinfo.value))
+
+    # For the row-major test, we take a long matrix in row-major, so only the third is allowed:
+    with pytest.raises(TypeError) as excinfo:
+        m.get_elem_rm_nocopy(int_matrix_colmajor)
+    assert ('get_elem_rm_nocopy(): incompatible function arguments.' in str(excinfo.value) and
+            ', flags.c_contiguous' in str(excinfo.value))
+    with pytest.raises(TypeError) as excinfo:
+        m.get_elem_rm_nocopy(dbl_matrix_colmajor)
+    assert ('get_elem_rm_nocopy(): incompatible function arguments.' in str(excinfo.value) and
+            ', flags.c_contiguous' in str(excinfo.value))
+    assert m.get_elem_rm_nocopy(int_matrix_rowmajor) == 8
+    with pytest.raises(TypeError) as excinfo:
+        m.get_elem_rm_nocopy(dbl_matrix_rowmajor)
+    assert ('get_elem_rm_nocopy(): incompatible function arguments.' in str(excinfo.value) and
+            ', flags.c_contiguous' in str(excinfo.value))
+
+
+def test_eigen_ref_life_support():
+    """Ensure the lifetime of temporary arrays created by the `Ref` caster
+
+    The `Ref` caster sometimes creates a copy which needs to stay alive. This needs to
+    happen both for directs casts (just the array) or indirectly (e.g. list of arrays).
+    """
+
+    a = np.full(shape=10, fill_value=8, dtype=np.int8)
+    assert m.get_elem_direct(a) == 8
+
+    list_of_a = [a]
+    assert m.get_elem_indirect(list_of_a) == 8
+
+
+def test_special_matrix_objects():
+    assert np.all(m.incr_diag(7) == np.diag([1., 2, 3, 4, 5, 6, 7]))
+
+    asymm = np.array([[ 1.,  2,  3,  4],
+                      [ 5,  6,  7,  8],
+                      [ 9, 10, 11, 12],
+                      [13, 14, 15, 16]])
+    symm_lower = np.array(asymm)
+    symm_upper = np.array(asymm)
+    for i in range(4):
+        for j in range(i + 1, 4):
+            symm_lower[i, j] = symm_lower[j, i]
+            symm_upper[j, i] = symm_upper[i, j]
+
+    assert np.all(m.symmetric_lower(asymm) == symm_lower)
+    assert np.all(m.symmetric_upper(asymm) == symm_upper)
+
+
+def test_dense_signature(doc):
+    assert doc(m.double_col) == """
+        double_col(arg0: numpy.ndarray[float32[m, 1]]) -> numpy.ndarray[float32[m, 1]]
+    """
+    assert doc(m.double_row) == """
+        double_row(arg0: numpy.ndarray[float32[1, n]]) -> numpy.ndarray[float32[1, n]]
+    """
+    assert doc(m.double_complex) == """
+        double_complex(arg0: numpy.ndarray[complex64[m, 1]]) -> numpy.ndarray[complex64[m, 1]]
+    """
+    assert doc(m.double_mat_rm) == """
+        double_mat_rm(arg0: numpy.ndarray[float32[m, n]]) -> numpy.ndarray[float32[m, n]]
+    """
+
+
+def test_named_arguments():
+    a = np.array([[1.0, 2], [3, 4], [5, 6]])
+    b = np.ones((2, 1))
+
+    assert np.all(m.matrix_multiply(a, b) == np.array([[3.], [7], [11]]))
+    assert np.all(m.matrix_multiply(A=a, B=b) == np.array([[3.], [7], [11]]))
+    assert np.all(m.matrix_multiply(B=b, A=a) == np.array([[3.], [7], [11]]))
+
+    with pytest.raises(ValueError) as excinfo:
+        m.matrix_multiply(b, a)
+    assert str(excinfo.value) == 'Nonconformable matrices!'
+
+    with pytest.raises(ValueError) as excinfo:
+        m.matrix_multiply(A=b, B=a)
+    assert str(excinfo.value) == 'Nonconformable matrices!'
+
+    with pytest.raises(ValueError) as excinfo:
+        m.matrix_multiply(B=a, A=b)
+    assert str(excinfo.value) == 'Nonconformable matrices!'
+
+
+@pytest.requires_eigen_and_scipy
+def test_sparse():
+    assert_sparse_equal_ref(m.sparse_r())
+    assert_sparse_equal_ref(m.sparse_c())
+    assert_sparse_equal_ref(m.sparse_copy_r(m.sparse_r()))
+    assert_sparse_equal_ref(m.sparse_copy_c(m.sparse_c()))
+    assert_sparse_equal_ref(m.sparse_copy_r(m.sparse_c()))
+    assert_sparse_equal_ref(m.sparse_copy_c(m.sparse_r()))
+
+
+@pytest.requires_eigen_and_scipy
+def test_sparse_signature(doc):
+    assert doc(m.sparse_copy_r) == """
+        sparse_copy_r(arg0: scipy.sparse.csr_matrix[float32]) -> scipy.sparse.csr_matrix[float32]
+    """  # noqa: E501 line too long
+    assert doc(m.sparse_copy_c) == """
+        sparse_copy_c(arg0: scipy.sparse.csc_matrix[float32]) -> scipy.sparse.csc_matrix[float32]
+    """  # noqa: E501 line too long
+
+
+def test_issue738():
+    """Ignore strides on a length-1 dimension (even if they would be incompatible length > 1)"""
+    assert np.all(m.iss738_f1(np.array([[1., 2, 3]])) == np.array([[1., 102, 203]]))
+    assert np.all(m.iss738_f1(np.array([[1.], [2], [3]])) == np.array([[1.], [12], [23]]))
+
+    assert np.all(m.iss738_f2(np.array([[1., 2, 3]])) == np.array([[1., 102, 203]]))
+    assert np.all(m.iss738_f2(np.array([[1.], [2], [3]])) == np.array([[1.], [12], [23]]))
+
+
+def test_issue1105():
+    """Issue 1105: 1xN or Nx1 input arrays weren't accepted for eigen
+    compile-time row vectors or column vector"""
+    assert m.iss1105_row(np.ones((1, 7)))
+    assert m.iss1105_col(np.ones((7, 1)))
+
+    # These should still fail (incompatible dimensions):
+    with pytest.raises(TypeError) as excinfo:
+        m.iss1105_row(np.ones((7, 1)))
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.iss1105_col(np.ones((1, 7)))
+    assert "incompatible function arguments" in str(excinfo.value)
+
+
+def test_custom_operator_new():
+    """Using Eigen types as member variables requires a class-specific
+    operator new with proper alignment"""
+
+    o = m.CustomOperatorNew()
+    np.testing.assert_allclose(o.a, 0.0)
+    np.testing.assert_allclose(o.b.diagonal(), 1.0)
diff --git a/3rdparty/pybind11/tests/test_embed/CMakeLists.txt b/3rdparty/pybind11/tests/test_embed/CMakeLists.txt
new file mode 100644
index 00000000..8b4f1f84
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_embed/CMakeLists.txt
@@ -0,0 +1,41 @@
+if(${PYTHON_MODULE_EXTENSION} MATCHES "pypy")
+  add_custom_target(cpptest)  # Dummy target on PyPy. Embedding is not supported.
+  set(_suppress_unused_variable_warning "${DOWNLOAD_CATCH}")
+  return()
+endif()
+
+find_package(Catch 1.9.3)
+if(CATCH_FOUND)
+  message(STATUS "Building interpreter tests using Catch v${CATCH_VERSION}")
+else()
+  message(STATUS "Catch not detected. Interpreter tests will be skipped. Install Catch headers"
+                 " manually or use `cmake -DDOWNLOAD_CATCH=1` to fetch them automatically.")
+  return()
+endif()
+
+add_executable(test_embed
+  catch.cpp
+  test_interpreter.cpp
+)
+target_include_directories(test_embed PRIVATE ${CATCH_INCLUDE_DIR})
+pybind11_enable_warnings(test_embed)
+
+if(NOT CMAKE_VERSION VERSION_LESS 3.0)
+  target_link_libraries(test_embed PRIVATE pybind11::embed)
+else()
+  target_include_directories(test_embed PRIVATE ${PYBIND11_INCLUDE_DIR} ${PYTHON_INCLUDE_DIRS})
+  target_compile_options(test_embed PRIVATE ${PYBIND11_CPP_STANDARD})
+  target_link_libraries(test_embed PRIVATE ${PYTHON_LIBRARIES})
+endif()
+
+find_package(Threads REQUIRED)
+target_link_libraries(test_embed PUBLIC ${CMAKE_THREAD_LIBS_INIT})
+
+add_custom_target(cpptest COMMAND $<TARGET_FILE:test_embed>
+                  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+pybind11_add_module(external_module THIN_LTO external_module.cpp)
+set_target_properties(external_module PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+add_dependencies(cpptest external_module)
+
+add_dependencies(check cpptest)
diff --git a/3rdparty/pybind11/tests/test_embed/catch.cpp b/3rdparty/pybind11/tests/test_embed/catch.cpp
new file mode 100644
index 00000000..dd137385
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_embed/catch.cpp
@@ -0,0 +1,22 @@
+// The Catch implementation is compiled here. This is a standalone
+// translation unit to avoid recompiling it for every test change.
+
+#include <pybind11/embed.h>
+
+#ifdef _MSC_VER
+// Silence MSVC C++17 deprecation warning from Catch regarding std::uncaught_exceptions (up to catch
+// 2.0.1; this should be fixed in the next catch release after 2.0.1).
+#  pragma warning(disable: 4996)
+#endif
+
+#define CATCH_CONFIG_RUNNER
+#include <catch.hpp>
+
+namespace py = pybind11;
+
+int main(int argc, char *argv[]) {
+    py::scoped_interpreter guard{};
+    auto result = Catch::Session().run(argc, argv);
+
+    return result < 0xff ? result : 0xff;
+}
diff --git a/3rdparty/pybind11/tests/test_embed/external_module.cpp b/3rdparty/pybind11/tests/test_embed/external_module.cpp
new file mode 100644
index 00000000..e9a6058b
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_embed/external_module.cpp
@@ -0,0 +1,23 @@
+#include <pybind11/pybind11.h>
+
+namespace py = pybind11;
+
+/* Simple test module/test class to check that the referenced internals data of external pybind11
+ * modules aren't preserved over a finalize/initialize.
+ */
+
+PYBIND11_MODULE(external_module, m) {
+    class A {
+    public:
+        A(int value) : v{value} {};
+        int v;
+    };
+
+    py::class_<A>(m, "A")
+        .def(py::init<int>())
+        .def_readwrite("value", &A::v);
+
+    m.def("internals_at", []() {
+        return reinterpret_cast<uintptr_t>(&py::detail::get_internals());
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_embed/test_interpreter.cpp b/3rdparty/pybind11/tests/test_embed/test_interpreter.cpp
new file mode 100644
index 00000000..222bd565
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_embed/test_interpreter.cpp
@@ -0,0 +1,284 @@
+#include <pybind11/embed.h>
+
+#ifdef _MSC_VER
+// Silence MSVC C++17 deprecation warning from Catch regarding std::uncaught_exceptions (up to catch
+// 2.0.1; this should be fixed in the next catch release after 2.0.1).
+#  pragma warning(disable: 4996)
+#endif
+
+#include <catch.hpp>
+
+#include <thread>
+#include <fstream>
+#include <functional>
+
+namespace py = pybind11;
+using namespace py::literals;
+
+class Widget {
+public:
+    Widget(std::string message) : message(message) { }
+    virtual ~Widget() = default;
+
+    std::string the_message() const { return message; }
+    virtual int the_answer() const = 0;
+
+private:
+    std::string message;
+};
+
+class PyWidget final : public Widget {
+    using Widget::Widget;
+
+    int the_answer() const override { PYBIND11_OVERLOAD_PURE(int, Widget, the_answer); }
+};
+
+PYBIND11_EMBEDDED_MODULE(widget_module, m) {
+    py::class_<Widget, PyWidget>(m, "Widget")
+        .def(py::init<std::string>())
+        .def_property_readonly("the_message", &Widget::the_message);
+
+    m.def("add", [](int i, int j) { return i + j; });
+}
+
+PYBIND11_EMBEDDED_MODULE(throw_exception, ) {
+    throw std::runtime_error("C++ Error");
+}
+
+PYBIND11_EMBEDDED_MODULE(throw_error_already_set, ) {
+    auto d = py::dict();
+    d["missing"].cast<py::object>();
+}
+
+TEST_CASE("Pass classes and data between modules defined in C++ and Python") {
+    auto module = py::module::import("test_interpreter");
+    REQUIRE(py::hasattr(module, "DerivedWidget"));
+
+    auto locals = py::dict("hello"_a="Hello, World!", "x"_a=5, **module.attr("__dict__"));
+    py::exec(R"(
+        widget = DerivedWidget("{} - {}".format(hello, x))
+        message = widget.the_message
+    )", py::globals(), locals);
+    REQUIRE(locals["message"].cast<std::string>() == "Hello, World! - 5");
+
+    auto py_widget = module.attr("DerivedWidget")("The question");
+    auto message = py_widget.attr("the_message");
+    REQUIRE(message.cast<std::string>() == "The question");
+
+    const auto &cpp_widget = py_widget.cast<const Widget &>();
+    REQUIRE(cpp_widget.the_answer() == 42);
+}
+
+TEST_CASE("Import error handling") {
+    REQUIRE_NOTHROW(py::module::import("widget_module"));
+    REQUIRE_THROWS_WITH(py::module::import("throw_exception"),
+                        "ImportError: C++ Error");
+    REQUIRE_THROWS_WITH(py::module::import("throw_error_already_set"),
+                        Catch::Contains("ImportError: KeyError"));
+}
+
+TEST_CASE("There can be only one interpreter") {
+    static_assert(std::is_move_constructible<py::scoped_interpreter>::value, "");
+    static_assert(!std::is_move_assignable<py::scoped_interpreter>::value, "");
+    static_assert(!std::is_copy_constructible<py::scoped_interpreter>::value, "");
+    static_assert(!std::is_copy_assignable<py::scoped_interpreter>::value, "");
+
+    REQUIRE_THROWS_WITH(py::initialize_interpreter(), "The interpreter is already running");
+    REQUIRE_THROWS_WITH(py::scoped_interpreter(), "The interpreter is already running");
+
+    py::finalize_interpreter();
+    REQUIRE_NOTHROW(py::scoped_interpreter());
+    {
+        auto pyi1 = py::scoped_interpreter();
+        auto pyi2 = std::move(pyi1);
+    }
+    py::initialize_interpreter();
+}
+
+bool has_pybind11_internals_builtin() {
+    auto builtins = py::handle(PyEval_GetBuiltins());
+    return builtins.contains(PYBIND11_INTERNALS_ID);
+};
+
+bool has_pybind11_internals_static() {
+    auto **&ipp = py::detail::get_internals_pp();
+    return ipp && *ipp;
+}
+
+TEST_CASE("Restart the interpreter") {
+    // Verify pre-restart state.
+    REQUIRE(py::module::import("widget_module").attr("add")(1, 2).cast<int>() == 3);
+    REQUIRE(has_pybind11_internals_builtin());
+    REQUIRE(has_pybind11_internals_static());
+    REQUIRE(py::module::import("external_module").attr("A")(123).attr("value").cast<int>() == 123);
+
+    // local and foreign module internals should point to the same internals:
+    REQUIRE(reinterpret_cast<uintptr_t>(*py::detail::get_internals_pp()) ==
+            py::module::import("external_module").attr("internals_at")().cast<uintptr_t>());
+
+    // Restart the interpreter.
+    py::finalize_interpreter();
+    REQUIRE(Py_IsInitialized() == 0);
+
+    py::initialize_interpreter();
+    REQUIRE(Py_IsInitialized() == 1);
+
+    // Internals are deleted after a restart.
+    REQUIRE_FALSE(has_pybind11_internals_builtin());
+    REQUIRE_FALSE(has_pybind11_internals_static());
+    pybind11::detail::get_internals();
+    REQUIRE(has_pybind11_internals_builtin());
+    REQUIRE(has_pybind11_internals_static());
+    REQUIRE(reinterpret_cast<uintptr_t>(*py::detail::get_internals_pp()) ==
+            py::module::import("external_module").attr("internals_at")().cast<uintptr_t>());
+
+    // Make sure that an interpreter with no get_internals() created until finalize still gets the
+    // internals destroyed
+    py::finalize_interpreter();
+    py::initialize_interpreter();
+    bool ran = false;
+    py::module::import("__main__").attr("internals_destroy_test") =
+        py::capsule(&ran, [](void *ran) { py::detail::get_internals(); *static_cast<bool *>(ran) = true; });
+    REQUIRE_FALSE(has_pybind11_internals_builtin());
+    REQUIRE_FALSE(has_pybind11_internals_static());
+    REQUIRE_FALSE(ran);
+    py::finalize_interpreter();
+    REQUIRE(ran);
+    py::initialize_interpreter();
+    REQUIRE_FALSE(has_pybind11_internals_builtin());
+    REQUIRE_FALSE(has_pybind11_internals_static());
+
+    // C++ modules can be reloaded.
+    auto cpp_module = py::module::import("widget_module");
+    REQUIRE(cpp_module.attr("add")(1, 2).cast<int>() == 3);
+
+    // C++ type information is reloaded and can be used in python modules.
+    auto py_module = py::module::import("test_interpreter");
+    auto py_widget = py_module.attr("DerivedWidget")("Hello after restart");
+    REQUIRE(py_widget.attr("the_message").cast<std::string>() == "Hello after restart");
+}
+
+TEST_CASE("Subinterpreter") {
+    // Add tags to the modules in the main interpreter and test the basics.
+    py::module::import("__main__").attr("main_tag") = "main interpreter";
+    {
+        auto m = py::module::import("widget_module");
+        m.attr("extension_module_tag") = "added to module in main interpreter";
+
+        REQUIRE(m.attr("add")(1, 2).cast<int>() == 3);
+    }
+    REQUIRE(has_pybind11_internals_builtin());
+    REQUIRE(has_pybind11_internals_static());
+
+    /// Create and switch to a subinterpreter.
+    auto main_tstate = PyThreadState_Get();
+    auto sub_tstate = Py_NewInterpreter();
+
+    // Subinterpreters get their own copy of builtins. detail::get_internals() still
+    // works by returning from the static variable, i.e. all interpreters share a single
+    // global pybind11::internals;
+    REQUIRE_FALSE(has_pybind11_internals_builtin());
+    REQUIRE(has_pybind11_internals_static());
+
+    // Modules tags should be gone.
+    REQUIRE_FALSE(py::hasattr(py::module::import("__main__"), "tag"));
+    {
+        auto m = py::module::import("widget_module");
+        REQUIRE_FALSE(py::hasattr(m, "extension_module_tag"));
+
+        // Function bindings should still work.
+        REQUIRE(m.attr("add")(1, 2).cast<int>() == 3);
+    }
+
+    // Restore main interpreter.
+    Py_EndInterpreter(sub_tstate);
+    PyThreadState_Swap(main_tstate);
+
+    REQUIRE(py::hasattr(py::module::import("__main__"), "main_tag"));
+    REQUIRE(py::hasattr(py::module::import("widget_module"), "extension_module_tag"));
+}
+
+TEST_CASE("Execution frame") {
+    // When the interpreter is embedded, there is no execution frame, but `py::exec`
+    // should still function by using reasonable globals: `__main__.__dict__`.
+    py::exec("var = dict(number=42)");
+    REQUIRE(py::globals()["var"]["number"].cast<int>() == 42);
+}
+
+TEST_CASE("Threads") {
+    // Restart interpreter to ensure threads are not initialized
+    py::finalize_interpreter();
+    py::initialize_interpreter();
+    REQUIRE_FALSE(has_pybind11_internals_static());
+
+    constexpr auto num_threads = 10;
+    auto locals = py::dict("count"_a=0);
+
+    {
+        py::gil_scoped_release gil_release{};
+        REQUIRE(has_pybind11_internals_static());
+
+        auto threads = std::vector<std::thread>();
+        for (auto i = 0; i < num_threads; ++i) {
+            threads.emplace_back([&]() {
+                py::gil_scoped_acquire gil{};
+                locals["count"] = locals["count"].cast<int>() + 1;
+            });
+        }
+
+        for (auto &thread : threads) {
+            thread.join();
+        }
+    }
+
+    REQUIRE(locals["count"].cast<int>() == num_threads);
+}
+
+// Scope exit utility https://stackoverflow.com/a/36644501/7255855
+struct scope_exit {
+    std::function<void()> f_;
+    explicit scope_exit(std::function<void()> f) noexcept : f_(std::move(f)) {}
+    ~scope_exit() { if (f_) f_(); }
+};
+
+TEST_CASE("Reload module from file") {
+    // Disable generation of cached bytecode (.pyc files) for this test, otherwise
+    // Python might pick up an old version from the cache instead of the new versions
+    // of the .py files generated below
+    auto sys = py::module::import("sys");
+    bool dont_write_bytecode = sys.attr("dont_write_bytecode").cast<bool>();
+    sys.attr("dont_write_bytecode") = true;
+    // Reset the value at scope exit
+    scope_exit reset_dont_write_bytecode([&]() {
+        sys.attr("dont_write_bytecode") = dont_write_bytecode;
+    });
+
+    std::string module_name = "test_module_reload";
+    std::string module_file = module_name + ".py";
+
+    // Create the module .py file
+    std::ofstream test_module(module_file);
+    test_module << "def test():\n";
+    test_module << "    return 1\n";
+    test_module.close();
+    // Delete the file at scope exit
+    scope_exit delete_module_file([&]() {
+        std::remove(module_file.c_str());
+    });
+
+    // Import the module from file
+    auto module = py::module::import(module_name.c_str());
+    int result = module.attr("test")().cast<int>();
+    REQUIRE(result == 1);
+
+    // Update the module .py file with a small change
+    test_module.open(module_file);
+    test_module << "def test():\n";
+    test_module << "    return 2\n";
+    test_module.close();
+
+    // Reload the module
+    module.reload();
+    result = module.attr("test")().cast<int>();
+    REQUIRE(result == 2);
+}
diff --git a/3rdparty/pybind11/tests/test_embed/test_interpreter.py b/3rdparty/pybind11/tests/test_embed/test_interpreter.py
new file mode 100644
index 00000000..26a04792
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_embed/test_interpreter.py
@@ -0,0 +1,9 @@
+from widget_module import Widget
+
+
+class DerivedWidget(Widget):
+    def __init__(self, message):
+        super(DerivedWidget, self).__init__(message)
+
+    def the_answer(self):
+        return 42
diff --git a/3rdparty/pybind11/tests/test_enum.cpp b/3rdparty/pybind11/tests/test_enum.cpp
new file mode 100644
index 00000000..31530892
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_enum.cpp
@@ -0,0 +1,87 @@
+/*
+    tests/test_enums.cpp -- enumerations
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+TEST_SUBMODULE(enums, m) {
+    // test_unscoped_enum
+    enum UnscopedEnum {
+        EOne = 1,
+        ETwo,
+        EThree
+    };
+    py::enum_<UnscopedEnum>(m, "UnscopedEnum", py::arithmetic(), "An unscoped enumeration")
+        .value("EOne", EOne, "Docstring for EOne")
+        .value("ETwo", ETwo, "Docstring for ETwo")
+        .value("EThree", EThree, "Docstring for EThree")
+        .export_values();
+
+    // test_scoped_enum
+    enum class ScopedEnum {
+        Two = 2,
+        Three
+    };
+    py::enum_<ScopedEnum>(m, "ScopedEnum", py::arithmetic())
+        .value("Two", ScopedEnum::Two)
+        .value("Three", ScopedEnum::Three);
+
+    m.def("test_scoped_enum", [](ScopedEnum z) {
+        return "ScopedEnum::" + std::string(z == ScopedEnum::Two ? "Two" : "Three");
+    });
+
+    // test_binary_operators
+    enum Flags {
+        Read = 4,
+        Write = 2,
+        Execute = 1
+    };
+    py::enum_<Flags>(m, "Flags", py::arithmetic())
+        .value("Read", Flags::Read)
+        .value("Write", Flags::Write)
+        .value("Execute", Flags::Execute)
+        .export_values();
+
+    // test_implicit_conversion
+    class ClassWithUnscopedEnum {
+    public:
+        enum EMode {
+            EFirstMode = 1,
+            ESecondMode
+        };
+
+        static EMode test_function(EMode mode) {
+            return mode;
+        }
+    };
+    py::class_<ClassWithUnscopedEnum> exenum_class(m, "ClassWithUnscopedEnum");
+    exenum_class.def_static("test_function", &ClassWithUnscopedEnum::test_function);
+    py::enum_<ClassWithUnscopedEnum::EMode>(exenum_class, "EMode")
+        .value("EFirstMode", ClassWithUnscopedEnum::EFirstMode)
+        .value("ESecondMode", ClassWithUnscopedEnum::ESecondMode)
+        .export_values();
+
+    // test_enum_to_int
+    m.def("test_enum_to_int", [](int) { });
+    m.def("test_enum_to_uint", [](uint32_t) { });
+    m.def("test_enum_to_long_long", [](long long) { });
+
+    // test_duplicate_enum_name
+    enum SimpleEnum
+    {
+        ONE, TWO, THREE
+    };
+
+    m.def("register_bad_enum", [m]() {
+        py::enum_<SimpleEnum>(m, "SimpleEnum")
+            .value("ONE", SimpleEnum::ONE)          //NOTE: all value function calls are called with the same first parameter value
+            .value("ONE", SimpleEnum::TWO)
+            .value("ONE", SimpleEnum::THREE)
+            .export_values();
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_enum.py b/3rdparty/pybind11/tests/test_enum.py
new file mode 100644
index 00000000..7fe9b618
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_enum.py
@@ -0,0 +1,206 @@
+import pytest
+from pybind11_tests import enums as m
+
+
+def test_unscoped_enum():
+    assert str(m.UnscopedEnum.EOne) == "UnscopedEnum.EOne"
+    assert str(m.UnscopedEnum.ETwo) == "UnscopedEnum.ETwo"
+    assert str(m.EOne) == "UnscopedEnum.EOne"
+
+    # name property
+    assert m.UnscopedEnum.EOne.name == "EOne"
+    assert m.UnscopedEnum.ETwo.name == "ETwo"
+    assert m.EOne.name == "EOne"
+    # name readonly
+    with pytest.raises(AttributeError):
+        m.UnscopedEnum.EOne.name = ""
+    # name returns a copy
+    foo = m.UnscopedEnum.EOne.name
+    foo = "bar"
+    assert m.UnscopedEnum.EOne.name == "EOne"
+
+    # __members__ property
+    assert m.UnscopedEnum.__members__ == \
+        {"EOne": m.UnscopedEnum.EOne, "ETwo": m.UnscopedEnum.ETwo, "EThree": m.UnscopedEnum.EThree}
+    # __members__ readonly
+    with pytest.raises(AttributeError):
+        m.UnscopedEnum.__members__ = {}
+    # __members__ returns a copy
+    foo = m.UnscopedEnum.__members__
+    foo["bar"] = "baz"
+    assert m.UnscopedEnum.__members__ == \
+        {"EOne": m.UnscopedEnum.EOne, "ETwo": m.UnscopedEnum.ETwo, "EThree": m.UnscopedEnum.EThree}
+
+    for docstring_line in '''An unscoped enumeration
+
+Members:
+
+  EOne : Docstring for EOne
+
+  ETwo : Docstring for ETwo
+
+  EThree : Docstring for EThree'''.split('\n'):
+        assert docstring_line in m.UnscopedEnum.__doc__
+
+    # Unscoped enums will accept ==/!= int comparisons
+    y = m.UnscopedEnum.ETwo
+    assert y == 2
+    assert 2 == y
+    assert y != 3
+    assert 3 != y
+    # Compare with None
+    assert (y != None)  # noqa: E711
+    assert not (y == None)  # noqa: E711
+    # Compare with an object
+    assert (y != object())
+    assert not (y == object())
+    # Compare with string
+    assert y != "2"
+    assert "2" != y
+    assert not ("2" == y)
+    assert not (y == "2")
+
+    with pytest.raises(TypeError):
+        y < object()
+
+    with pytest.raises(TypeError):
+        y <= object()
+
+    with pytest.raises(TypeError):
+        y > object()
+
+    with pytest.raises(TypeError):
+        y >= object()
+
+    with pytest.raises(TypeError):
+        y | object()
+
+    with pytest.raises(TypeError):
+        y & object()
+
+    with pytest.raises(TypeError):
+        y ^ object()
+
+    assert int(m.UnscopedEnum.ETwo) == 2
+    assert str(m.UnscopedEnum(2)) == "UnscopedEnum.ETwo"
+
+    # order
+    assert m.UnscopedEnum.EOne < m.UnscopedEnum.ETwo
+    assert m.UnscopedEnum.EOne < 2
+    assert m.UnscopedEnum.ETwo > m.UnscopedEnum.EOne
+    assert m.UnscopedEnum.ETwo > 1
+    assert m.UnscopedEnum.ETwo <= 2
+    assert m.UnscopedEnum.ETwo >= 2
+    assert m.UnscopedEnum.EOne <= m.UnscopedEnum.ETwo
+    assert m.UnscopedEnum.EOne <= 2
+    assert m.UnscopedEnum.ETwo >= m.UnscopedEnum.EOne
+    assert m.UnscopedEnum.ETwo >= 1
+    assert not (m.UnscopedEnum.ETwo < m.UnscopedEnum.EOne)
+    assert not (2 < m.UnscopedEnum.EOne)
+
+    # arithmetic
+    assert m.UnscopedEnum.EOne & m.UnscopedEnum.EThree == m.UnscopedEnum.EOne
+    assert m.UnscopedEnum.EOne | m.UnscopedEnum.ETwo == m.UnscopedEnum.EThree
+    assert m.UnscopedEnum.EOne ^ m.UnscopedEnum.EThree == m.UnscopedEnum.ETwo
+
+
+def test_scoped_enum():
+    assert m.test_scoped_enum(m.ScopedEnum.Three) == "ScopedEnum::Three"
+    z = m.ScopedEnum.Two
+    assert m.test_scoped_enum(z) == "ScopedEnum::Two"
+
+    # Scoped enums will *NOT* accept ==/!= int comparisons (Will always return False)
+    assert not z == 3
+    assert not 3 == z
+    assert z != 3
+    assert 3 != z
+    # Compare with None
+    assert (z != None)  # noqa: E711
+    assert not (z == None)  # noqa: E711
+    # Compare with an object
+    assert (z != object())
+    assert not (z == object())
+    # Scoped enums will *NOT* accept >, <, >= and <= int comparisons (Will throw exceptions)
+    with pytest.raises(TypeError):
+        z > 3
+    with pytest.raises(TypeError):
+        z < 3
+    with pytest.raises(TypeError):
+        z >= 3
+    with pytest.raises(TypeError):
+        z <= 3
+
+    # order
+    assert m.ScopedEnum.Two < m.ScopedEnum.Three
+    assert m.ScopedEnum.Three > m.ScopedEnum.Two
+    assert m.ScopedEnum.Two <= m.ScopedEnum.Three
+    assert m.ScopedEnum.Two <= m.ScopedEnum.Two
+    assert m.ScopedEnum.Two >= m.ScopedEnum.Two
+    assert m.ScopedEnum.Three >= m.ScopedEnum.Two
+
+
+def test_implicit_conversion():
+    assert str(m.ClassWithUnscopedEnum.EMode.EFirstMode) == "EMode.EFirstMode"
+    assert str(m.ClassWithUnscopedEnum.EFirstMode) == "EMode.EFirstMode"
+
+    f = m.ClassWithUnscopedEnum.test_function
+    first = m.ClassWithUnscopedEnum.EFirstMode
+    second = m.ClassWithUnscopedEnum.ESecondMode
+
+    assert f(first) == 1
+
+    assert f(first) == f(first)
+    assert not f(first) != f(first)
+
+    assert f(first) != f(second)
+    assert not f(first) == f(second)
+
+    assert f(first) == int(f(first))
+    assert not f(first) != int(f(first))
+
+    assert f(first) != int(f(second))
+    assert not f(first) == int(f(second))
+
+    # noinspection PyDictCreation
+    x = {f(first): 1, f(second): 2}
+    x[f(first)] = 3
+    x[f(second)] = 4
+    # Hashing test
+    assert str(x) == "{EMode.EFirstMode: 3, EMode.ESecondMode: 4}"
+
+
+def test_binary_operators():
+    assert int(m.Flags.Read) == 4
+    assert int(m.Flags.Write) == 2
+    assert int(m.Flags.Execute) == 1
+    assert int(m.Flags.Read | m.Flags.Write | m.Flags.Execute) == 7
+    assert int(m.Flags.Read | m.Flags.Write) == 6
+    assert int(m.Flags.Read | m.Flags.Execute) == 5
+    assert int(m.Flags.Write | m.Flags.Execute) == 3
+    assert int(m.Flags.Write | 1) == 3
+    assert ~m.Flags.Write == -3
+
+    state = m.Flags.Read | m.Flags.Write
+    assert (state & m.Flags.Read) != 0
+    assert (state & m.Flags.Write) != 0
+    assert (state & m.Flags.Execute) == 0
+    assert (state & 1) == 0
+
+    state2 = ~state
+    assert state2 == -7
+    assert int(state ^ state2) == -1
+
+
+def test_enum_to_int():
+    m.test_enum_to_int(m.Flags.Read)
+    m.test_enum_to_int(m.ClassWithUnscopedEnum.EMode.EFirstMode)
+    m.test_enum_to_uint(m.Flags.Read)
+    m.test_enum_to_uint(m.ClassWithUnscopedEnum.EMode.EFirstMode)
+    m.test_enum_to_long_long(m.Flags.Read)
+    m.test_enum_to_long_long(m.ClassWithUnscopedEnum.EMode.EFirstMode)
+
+
+def test_duplicate_enum_name():
+    with pytest.raises(ValueError) as excinfo:
+        m.register_bad_enum()
+    assert str(excinfo.value) == 'SimpleEnum: element "ONE" already exists!'
diff --git a/3rdparty/pybind11/tests/test_eval.cpp b/3rdparty/pybind11/tests/test_eval.cpp
new file mode 100644
index 00000000..e0948219
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_eval.cpp
@@ -0,0 +1,91 @@
+/*
+    tests/test_eval.cpp -- Usage of eval() and eval_file()
+
+    Copyright (c) 2016 Klemens D. Morgenstern
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+
+#include <pybind11/eval.h>
+#include "pybind11_tests.h"
+
+TEST_SUBMODULE(eval_, m) {
+    // test_evals
+
+    auto global = py::dict(py::module::import("__main__").attr("__dict__"));
+
+    m.def("test_eval_statements", [global]() {
+        auto local = py::dict();
+        local["call_test"] = py::cpp_function([&]() -> int {
+            return 42;
+        });
+
+        // Regular string literal
+        py::exec(
+            "message = 'Hello World!'\n"
+            "x = call_test()",
+            global, local
+        );
+
+        // Multi-line raw string literal
+        py::exec(R"(
+            if x == 42:
+                print(message)
+            else:
+                raise RuntimeError
+            )", global, local
+        );
+        auto x = local["x"].cast<int>();
+
+        return x == 42;
+    });
+
+    m.def("test_eval", [global]() {
+        auto local = py::dict();
+        local["x"] = py::int_(42);
+        auto x = py::eval("x", global, local);
+        return x.cast<int>() == 42;
+    });
+
+    m.def("test_eval_single_statement", []() {
+        auto local = py::dict();
+        local["call_test"] = py::cpp_function([&]() -> int {
+            return 42;
+        });
+
+        auto result = py::eval<py::eval_single_statement>("x = call_test()", py::dict(), local);
+        auto x = local["x"].cast<int>();
+        return result.is_none() && x == 42;
+    });
+
+    m.def("test_eval_file", [global](py::str filename) {
+        auto local = py::dict();
+        local["y"] = py::int_(43);
+
+        int val_out;
+        local["call_test2"] = py::cpp_function([&](int value) { val_out = value; });
+
+        auto result = py::eval_file(filename, global, local);
+        return val_out == 43 && result.is_none();
+    });
+
+    m.def("test_eval_failure", []() {
+        try {
+            py::eval("nonsense code ...");
+        } catch (py::error_already_set &) {
+            return true;
+        }
+        return false;
+    });
+
+    m.def("test_eval_file_failure", []() {
+        try {
+            py::eval_file("non-existing file");
+        } catch (std::exception &) {
+            return true;
+        }
+        return false;
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_eval.py b/3rdparty/pybind11/tests/test_eval.py
new file mode 100644
index 00000000..bda4ef6b
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_eval.py
@@ -0,0 +1,17 @@
+import os
+from pybind11_tests import eval_ as m
+
+
+def test_evals(capture):
+    with capture:
+        assert m.test_eval_statements()
+    assert capture == "Hello World!"
+
+    assert m.test_eval()
+    assert m.test_eval_single_statement()
+
+    filename = os.path.join(os.path.dirname(__file__), "test_eval_call.py")
+    assert m.test_eval_file(filename)
+
+    assert m.test_eval_failure()
+    assert m.test_eval_file_failure()
diff --git a/3rdparty/pybind11/tests/test_eval_call.py b/3rdparty/pybind11/tests/test_eval_call.py
new file mode 100644
index 00000000..53c7e721
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_eval_call.py
@@ -0,0 +1,4 @@
+# This file is called from 'test_eval.py'
+
+if 'call_test2' in locals():
+    call_test2(y)  # noqa: F821 undefined name
diff --git a/3rdparty/pybind11/tests/test_exceptions.cpp b/3rdparty/pybind11/tests/test_exceptions.cpp
new file mode 100644
index 00000000..56cd9bc4
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_exceptions.cpp
@@ -0,0 +1,197 @@
+/*
+    tests/test_custom-exceptions.cpp -- exception translation
+
+    Copyright (c) 2016 Pim Schellart <P.Schellart@princeton.edu>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+// A type that should be raised as an exception in Python
+class MyException : public std::exception {
+public:
+    explicit MyException(const char * m) : message{m} {}
+    virtual const char * what() const noexcept override {return message.c_str();}
+private:
+    std::string message = "";
+};
+
+// A type that should be translated to a standard Python exception
+class MyException2 : public std::exception {
+public:
+    explicit MyException2(const char * m) : message{m} {}
+    virtual const char * what() const noexcept override {return message.c_str();}
+private:
+    std::string message = "";
+};
+
+// A type that is not derived from std::exception (and is thus unknown)
+class MyException3 {
+public:
+    explicit MyException3(const char * m) : message{m} {}
+    virtual const char * what() const noexcept {return message.c_str();}
+private:
+    std::string message = "";
+};
+
+// A type that should be translated to MyException
+// and delegated to its exception translator
+class MyException4 : public std::exception {
+public:
+    explicit MyException4(const char * m) : message{m} {}
+    virtual const char * what() const noexcept override {return message.c_str();}
+private:
+    std::string message = "";
+};
+
+
+// Like the above, but declared via the helper function
+class MyException5 : public std::logic_error {
+public:
+    explicit MyException5(const std::string &what) : std::logic_error(what) {}
+};
+
+// Inherits from MyException5
+class MyException5_1 : public MyException5 {
+    using MyException5::MyException5;
+};
+
+struct PythonCallInDestructor {
+    PythonCallInDestructor(const py::dict &d) : d(d) {}
+    ~PythonCallInDestructor() { d["good"] = true; }
+
+    py::dict d;
+};
+
+TEST_SUBMODULE(exceptions, m) {
+    m.def("throw_std_exception", []() {
+        throw std::runtime_error("This exception was intentionally thrown.");
+    });
+
+    // make a new custom exception and use it as a translation target
+    static py::exception<MyException> ex(m, "MyException");
+    py::register_exception_translator([](std::exception_ptr p) {
+        try {
+            if (p) std::rethrow_exception(p);
+        } catch (const MyException &e) {
+            // Set MyException as the active python error
+            ex(e.what());
+        }
+    });
+
+    // register new translator for MyException2
+    // no need to store anything here because this type will
+    // never by visible from Python
+    py::register_exception_translator([](std::exception_ptr p) {
+        try {
+            if (p) std::rethrow_exception(p);
+        } catch (const MyException2 &e) {
+            // Translate this exception to a standard RuntimeError
+            PyErr_SetString(PyExc_RuntimeError, e.what());
+        }
+    });
+
+    // register new translator for MyException4
+    // which will catch it and delegate to the previously registered
+    // translator for MyException by throwing a new exception
+    py::register_exception_translator([](std::exception_ptr p) {
+        try {
+            if (p) std::rethrow_exception(p);
+        } catch (const MyException4 &e) {
+            throw MyException(e.what());
+        }
+    });
+
+    // A simple exception translation:
+    auto ex5 = py::register_exception<MyException5>(m, "MyException5");
+    // A slightly more complicated one that declares MyException5_1 as a subclass of MyException5
+    py::register_exception<MyException5_1>(m, "MyException5_1", ex5.ptr());
+
+    m.def("throws1", []() { throw MyException("this error should go to a custom type"); });
+    m.def("throws2", []() { throw MyException2("this error should go to a standard Python exception"); });
+    m.def("throws3", []() { throw MyException3("this error cannot be translated"); });
+    m.def("throws4", []() { throw MyException4("this error is rethrown"); });
+    m.def("throws5", []() { throw MyException5("this is a helper-defined translated exception"); });
+    m.def("throws5_1", []() { throw MyException5_1("MyException5 subclass"); });
+    m.def("throws_logic_error", []() { throw std::logic_error("this error should fall through to the standard handler"); });
+    m.def("throws_overflow_error", []() {throw std::overflow_error(""); });
+    m.def("exception_matches", []() {
+        py::dict foo;
+        try {
+            // Assign to a py::object to force read access of nonexistent dict entry
+            py::object o = foo["bar"];
+        }
+        catch (py::error_already_set& ex) {
+            if (!ex.matches(PyExc_KeyError)) throw;
+            return true;
+        }
+        return false;
+    });
+    m.def("exception_matches_base", []() {
+        py::dict foo;
+        try {
+            // Assign to a py::object to force read access of nonexistent dict entry
+            py::object o = foo["bar"];
+        }
+        catch (py::error_already_set &ex) {
+            if (!ex.matches(PyExc_Exception)) throw;
+            return true;
+        }
+        return false;
+    });
+    m.def("modulenotfound_exception_matches_base", []() {
+        try {
+            // On Python >= 3.6, this raises a ModuleNotFoundError, a subclass of ImportError
+            py::module::import("nonexistent");
+        }
+        catch (py::error_already_set &ex) {
+            if (!ex.matches(PyExc_ImportError)) throw;
+            return true;
+        }
+        return false;
+    });
+
+    m.def("throw_already_set", [](bool err) {
+        if (err)
+            PyErr_SetString(PyExc_ValueError, "foo");
+        try {
+            throw py::error_already_set();
+        } catch (const std::runtime_error& e) {
+            if ((err && e.what() != std::string("ValueError: foo")) ||
+                (!err && e.what() != std::string("Unknown internal error occurred")))
+            {
+                PyErr_Clear();
+                throw std::runtime_error("error message mismatch");
+            }
+        }
+        PyErr_Clear();
+        if (err)
+            PyErr_SetString(PyExc_ValueError, "foo");
+        throw py::error_already_set();
+    });
+
+    m.def("python_call_in_destructor", [](py::dict d) {
+        try {
+            PythonCallInDestructor set_dict_in_destructor(d);
+            PyErr_SetString(PyExc_ValueError, "foo");
+            throw py::error_already_set();
+        } catch (const py::error_already_set&) {
+            return true;
+        }
+        return false;
+    });
+
+    // test_nested_throws
+    m.def("try_catch", [m](py::object exc_type, py::function f, py::args args) {
+        try { f(*args); }
+        catch (py::error_already_set &ex) {
+            if (ex.matches(exc_type))
+                py::print(ex.what());
+            else
+                throw;
+        }
+    });
+
+}
diff --git a/3rdparty/pybind11/tests/test_exceptions.py b/3rdparty/pybind11/tests/test_exceptions.py
new file mode 100644
index 00000000..ac2b3603
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_exceptions.py
@@ -0,0 +1,150 @@
+import pytest
+
+from pybind11_tests import exceptions as m
+import pybind11_cross_module_tests as cm
+
+
+def test_std_exception(msg):
+    with pytest.raises(RuntimeError) as excinfo:
+        m.throw_std_exception()
+    assert msg(excinfo.value) == "This exception was intentionally thrown."
+
+
+def test_error_already_set(msg):
+    with pytest.raises(RuntimeError) as excinfo:
+        m.throw_already_set(False)
+    assert msg(excinfo.value) == "Unknown internal error occurred"
+
+    with pytest.raises(ValueError) as excinfo:
+        m.throw_already_set(True)
+    assert msg(excinfo.value) == "foo"
+
+
+def test_cross_module_exceptions():
+    with pytest.raises(RuntimeError) as excinfo:
+        cm.raise_runtime_error()
+    assert str(excinfo.value) == "My runtime error"
+
+    with pytest.raises(ValueError) as excinfo:
+        cm.raise_value_error()
+    assert str(excinfo.value) == "My value error"
+
+    with pytest.raises(ValueError) as excinfo:
+        cm.throw_pybind_value_error()
+    assert str(excinfo.value) == "pybind11 value error"
+
+    with pytest.raises(TypeError) as excinfo:
+        cm.throw_pybind_type_error()
+    assert str(excinfo.value) == "pybind11 type error"
+
+    with pytest.raises(StopIteration) as excinfo:
+        cm.throw_stop_iteration()
+
+
+def test_python_call_in_catch():
+    d = {}
+    assert m.python_call_in_destructor(d) is True
+    assert d["good"] is True
+
+
+def test_exception_matches():
+    assert m.exception_matches()
+    assert m.exception_matches_base()
+    assert m.modulenotfound_exception_matches_base()
+
+
+def test_custom(msg):
+    # Can we catch a MyException?
+    with pytest.raises(m.MyException) as excinfo:
+        m.throws1()
+    assert msg(excinfo.value) == "this error should go to a custom type"
+
+    # Can we translate to standard Python exceptions?
+    with pytest.raises(RuntimeError) as excinfo:
+        m.throws2()
+    assert msg(excinfo.value) == "this error should go to a standard Python exception"
+
+    # Can we handle unknown exceptions?
+    with pytest.raises(RuntimeError) as excinfo:
+        m.throws3()
+    assert msg(excinfo.value) == "Caught an unknown exception!"
+
+    # Can we delegate to another handler by rethrowing?
+    with pytest.raises(m.MyException) as excinfo:
+        m.throws4()
+    assert msg(excinfo.value) == "this error is rethrown"
+
+    # Can we fall-through to the default handler?
+    with pytest.raises(RuntimeError) as excinfo:
+        m.throws_logic_error()
+    assert msg(excinfo.value) == "this error should fall through to the standard handler"
+
+    # OverFlow error translation.
+    with pytest.raises(OverflowError) as excinfo:
+        m.throws_overflow_error()
+
+    # Can we handle a helper-declared exception?
+    with pytest.raises(m.MyException5) as excinfo:
+        m.throws5()
+    assert msg(excinfo.value) == "this is a helper-defined translated exception"
+
+    # Exception subclassing:
+    with pytest.raises(m.MyException5) as excinfo:
+        m.throws5_1()
+    assert msg(excinfo.value) == "MyException5 subclass"
+    assert isinstance(excinfo.value, m.MyException5_1)
+
+    with pytest.raises(m.MyException5_1) as excinfo:
+        m.throws5_1()
+    assert msg(excinfo.value) == "MyException5 subclass"
+
+    with pytest.raises(m.MyException5) as excinfo:
+        try:
+            m.throws5()
+        except m.MyException5_1:
+            raise RuntimeError("Exception error: caught child from parent")
+    assert msg(excinfo.value) == "this is a helper-defined translated exception"
+
+
+def test_nested_throws(capture):
+    """Tests nested (e.g. C++ -> Python -> C++) exception handling"""
+
+    def throw_myex():
+        raise m.MyException("nested error")
+
+    def throw_myex5():
+        raise m.MyException5("nested error 5")
+
+    # In the comments below, the exception is caught in the first step, thrown in the last step
+
+    # C++ -> Python
+    with capture:
+        m.try_catch(m.MyException5, throw_myex5)
+    assert str(capture).startswith("MyException5: nested error 5")
+
+    # Python -> C++ -> Python
+    with pytest.raises(m.MyException) as excinfo:
+        m.try_catch(m.MyException5, throw_myex)
+    assert str(excinfo.value) == "nested error"
+
+    def pycatch(exctype, f, *args):
+        try:
+            f(*args)
+        except m.MyException as e:
+            print(e)
+
+    # C++ -> Python -> C++ -> Python
+    with capture:
+        m.try_catch(
+            m.MyException5, pycatch, m.MyException, m.try_catch, m.MyException, throw_myex5)
+    assert str(capture).startswith("MyException5: nested error 5")
+
+    # C++ -> Python -> C++
+    with capture:
+        m.try_catch(m.MyException, pycatch, m.MyException5, m.throws4)
+    assert capture == "this error is rethrown"
+
+    # Python -> C++ -> Python -> C++
+    with pytest.raises(m.MyException5) as excinfo:
+        m.try_catch(m.MyException, pycatch, m.MyException, m.throws5)
+    assert str(excinfo.value) == "this is a helper-defined translated exception"
diff --git a/3rdparty/pybind11/tests/test_factory_constructors.cpp b/3rdparty/pybind11/tests/test_factory_constructors.cpp
new file mode 100644
index 00000000..5cfbfdc3
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_factory_constructors.cpp
@@ -0,0 +1,338 @@
+/*
+    tests/test_factory_constructors.cpp -- tests construction from a factory function
+                                           via py::init_factory()
+
+    Copyright (c) 2017 Jason Rhinelander <jason@imaginary.ca>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <cmath>
+
+// Classes for testing python construction via C++ factory function:
+// Not publicly constructible, copyable, or movable:
+class TestFactory1 {
+    friend class TestFactoryHelper;
+    TestFactory1() : value("(empty)") { print_default_created(this); }
+    TestFactory1(int v) : value(std::to_string(v)) { print_created(this, value); }
+    TestFactory1(std::string v) : value(std::move(v)) { print_created(this, value); }
+    TestFactory1(TestFactory1 &&) = delete;
+    TestFactory1(const TestFactory1 &) = delete;
+    TestFactory1 &operator=(TestFactory1 &&) = delete;
+    TestFactory1 &operator=(const TestFactory1 &) = delete;
+public:
+    std::string value;
+    ~TestFactory1() { print_destroyed(this); }
+};
+// Non-public construction, but moveable:
+class TestFactory2 {
+    friend class TestFactoryHelper;
+    TestFactory2() : value("(empty2)") { print_default_created(this); }
+    TestFactory2(int v) : value(std::to_string(v)) { print_created(this, value); }
+    TestFactory2(std::string v) : value(std::move(v)) { print_created(this, value); }
+public:
+    TestFactory2(TestFactory2 &&m) { value = std::move(m.value); print_move_created(this); }
+    TestFactory2 &operator=(TestFactory2 &&m) { value = std::move(m.value); print_move_assigned(this); return *this; }
+    std::string value;
+    ~TestFactory2() { print_destroyed(this); }
+};
+// Mixed direct/factory construction:
+class TestFactory3 {
+protected:
+    friend class TestFactoryHelper;
+    TestFactory3() : value("(empty3)") { print_default_created(this); }
+    TestFactory3(int v) : value(std::to_string(v)) { print_created(this, value); }
+public:
+    TestFactory3(std::string v) : value(std::move(v)) { print_created(this, value); }
+    TestFactory3(TestFactory3 &&m) { value = std::move(m.value); print_move_created(this); }
+    TestFactory3 &operator=(TestFactory3 &&m) { value = std::move(m.value); print_move_assigned(this); return *this; }
+    std::string value;
+    virtual ~TestFactory3() { print_destroyed(this); }
+};
+// Inheritance test
+class TestFactory4 : public TestFactory3 {
+public:
+    TestFactory4() : TestFactory3() { print_default_created(this); }
+    TestFactory4(int v) : TestFactory3(v) { print_created(this, v); }
+    virtual ~TestFactory4() { print_destroyed(this); }
+};
+// Another class for an invalid downcast test
+class TestFactory5 : public TestFactory3 {
+public:
+    TestFactory5(int i) : TestFactory3(i) { print_created(this, i); }
+    virtual ~TestFactory5() { print_destroyed(this); }
+};
+
+class TestFactory6 {
+protected:
+    int value;
+    bool alias = false;
+public:
+    TestFactory6(int i) : value{i} { print_created(this, i); }
+    TestFactory6(TestFactory6 &&f) { print_move_created(this); value = f.value; alias = f.alias; }
+    TestFactory6(const TestFactory6 &f) { print_copy_created(this); value = f.value; alias = f.alias; }
+    virtual ~TestFactory6() { print_destroyed(this); }
+    virtual int get() { return value; }
+    bool has_alias() { return alias; }
+};
+class PyTF6 : public TestFactory6 {
+public:
+    // Special constructor that allows the factory to construct a PyTF6 from a TestFactory6 only
+    // when an alias is needed:
+    PyTF6(TestFactory6 &&base) : TestFactory6(std::move(base)) { alias = true; print_created(this, "move", value); }
+    PyTF6(int i) : TestFactory6(i) { alias = true; print_created(this, i); }
+    PyTF6(PyTF6 &&f) : TestFactory6(std::move(f)) { print_move_created(this); }
+    PyTF6(const PyTF6 &f) : TestFactory6(f) { print_copy_created(this); }
+    PyTF6(std::string s) : TestFactory6((int) s.size()) { alias = true; print_created(this, s); }
+    virtual ~PyTF6() { print_destroyed(this); }
+    int get() override { PYBIND11_OVERLOAD(int, TestFactory6, get, /*no args*/); }
+};
+
+class TestFactory7 {
+protected:
+    int value;
+    bool alias = false;
+public:
+    TestFactory7(int i) : value{i} { print_created(this, i); }
+    TestFactory7(TestFactory7 &&f) { print_move_created(this); value = f.value; alias = f.alias; }
+    TestFactory7(const TestFactory7 &f) { print_copy_created(this); value = f.value; alias = f.alias; }
+    virtual ~TestFactory7() { print_destroyed(this); }
+    virtual int get() { return value; }
+    bool has_alias() { return alias; }
+};
+class PyTF7 : public TestFactory7 {
+public:
+    PyTF7(int i) : TestFactory7(i) { alias = true; print_created(this, i); }
+    PyTF7(PyTF7 &&f) : TestFactory7(std::move(f)) { print_move_created(this); }
+    PyTF7(const PyTF7 &f) : TestFactory7(f) { print_copy_created(this); }
+    virtual ~PyTF7() { print_destroyed(this); }
+    int get() override { PYBIND11_OVERLOAD(int, TestFactory7, get, /*no args*/); }
+};
+
+
+class TestFactoryHelper {
+public:
+    // Non-movable, non-copyable type:
+    // Return via pointer:
+    static TestFactory1 *construct1() { return new TestFactory1(); }
+    // Holder:
+    static std::unique_ptr<TestFactory1> construct1(int a) { return std::unique_ptr<TestFactory1>(new TestFactory1(a)); }
+    // pointer again
+    static TestFactory1 *construct1_string(std::string a) { return new TestFactory1(a); }
+
+    // Moveable type:
+    // pointer:
+    static TestFactory2 *construct2() { return new TestFactory2(); }
+    // holder:
+    static std::unique_ptr<TestFactory2> construct2(int a) { return std::unique_ptr<TestFactory2>(new TestFactory2(a)); }
+    // by value moving:
+    static TestFactory2 construct2(std::string a) { return TestFactory2(a); }
+
+    // shared_ptr holder type:
+    // pointer:
+    static TestFactory3 *construct3() { return new TestFactory3(); }
+    // holder:
+    static std::shared_ptr<TestFactory3> construct3(int a) { return std::shared_ptr<TestFactory3>(new TestFactory3(a)); }
+};
+
+TEST_SUBMODULE(factory_constructors, m) {
+
+    // Define various trivial types to allow simpler overload resolution:
+    py::module m_tag = m.def_submodule("tag");
+#define MAKE_TAG_TYPE(Name) \
+    struct Name##_tag {}; \
+    py::class_<Name##_tag>(m_tag, #Name "_tag").def(py::init<>()); \
+    m_tag.attr(#Name) = py::cast(Name##_tag{})
+    MAKE_TAG_TYPE(pointer);
+    MAKE_TAG_TYPE(unique_ptr);
+    MAKE_TAG_TYPE(move);
+    MAKE_TAG_TYPE(shared_ptr);
+    MAKE_TAG_TYPE(derived);
+    MAKE_TAG_TYPE(TF4);
+    MAKE_TAG_TYPE(TF5);
+    MAKE_TAG_TYPE(null_ptr);
+    MAKE_TAG_TYPE(base);
+    MAKE_TAG_TYPE(invalid_base);
+    MAKE_TAG_TYPE(alias);
+    MAKE_TAG_TYPE(unaliasable);
+    MAKE_TAG_TYPE(mixed);
+
+    // test_init_factory_basic, test_bad_type
+    py::class_<TestFactory1>(m, "TestFactory1")
+        .def(py::init([](unique_ptr_tag, int v) { return TestFactoryHelper::construct1(v); }))
+        .def(py::init(&TestFactoryHelper::construct1_string)) // raw function pointer
+        .def(py::init([](pointer_tag) { return TestFactoryHelper::construct1(); }))
+        .def(py::init([](py::handle, int v, py::handle) { return TestFactoryHelper::construct1(v); }))
+        .def_readwrite("value", &TestFactory1::value)
+        ;
+    py::class_<TestFactory2>(m, "TestFactory2")
+        .def(py::init([](pointer_tag, int v) { return TestFactoryHelper::construct2(v); }))
+        .def(py::init([](unique_ptr_tag, std::string v) { return TestFactoryHelper::construct2(v); }))
+        .def(py::init([](move_tag) { return TestFactoryHelper::construct2(); }))
+        .def_readwrite("value", &TestFactory2::value)
+        ;
+
+    // Stateful & reused:
+    int c = 1;
+    auto c4a = [c](pointer_tag, TF4_tag, int a) { (void) c; return new TestFactory4(a);};
+
+    // test_init_factory_basic, test_init_factory_casting
+    py::class_<TestFactory3, std::shared_ptr<TestFactory3>>(m, "TestFactory3")
+        .def(py::init([](pointer_tag, int v) { return TestFactoryHelper::construct3(v); }))
+        .def(py::init([](shared_ptr_tag) { return TestFactoryHelper::construct3(); }))
+        .def("__init__", [](TestFactory3 &self, std::string v) { new (&self) TestFactory3(v); }) // placement-new ctor
+
+        // factories returning a derived type:
+        .def(py::init(c4a)) // derived ptr
+        .def(py::init([](pointer_tag, TF5_tag, int a) { return new TestFactory5(a); }))
+        // derived shared ptr:
+        .def(py::init([](shared_ptr_tag, TF4_tag, int a) { return std::make_shared<TestFactory4>(a); }))
+        .def(py::init([](shared_ptr_tag, TF5_tag, int a) { return std::make_shared<TestFactory5>(a); }))
+
+        // Returns nullptr:
+        .def(py::init([](null_ptr_tag) { return (TestFactory3 *) nullptr; }))
+
+        .def_readwrite("value", &TestFactory3::value)
+        ;
+
+    // test_init_factory_casting
+    py::class_<TestFactory4, TestFactory3, std::shared_ptr<TestFactory4>>(m, "TestFactory4")
+        .def(py::init(c4a)) // pointer
+        ;
+
+    // Doesn't need to be registered, but registering makes getting ConstructorStats easier:
+    py::class_<TestFactory5, TestFactory3, std::shared_ptr<TestFactory5>>(m, "TestFactory5");
+
+    // test_init_factory_alias
+    // Alias testing
+    py::class_<TestFactory6, PyTF6>(m, "TestFactory6")
+        .def(py::init([](base_tag, int i) { return TestFactory6(i); }))
+        .def(py::init([](alias_tag, int i) { return PyTF6(i); }))
+        .def(py::init([](alias_tag, std::string s) { return PyTF6(s); }))
+        .def(py::init([](alias_tag, pointer_tag, int i) { return new PyTF6(i); }))
+        .def(py::init([](base_tag, pointer_tag, int i) { return new TestFactory6(i); }))
+        .def(py::init([](base_tag, alias_tag, pointer_tag, int i) { return (TestFactory6 *) new PyTF6(i); }))
+
+        .def("get", &TestFactory6::get)
+        .def("has_alias", &TestFactory6::has_alias)
+
+        .def_static("get_cstats", &ConstructorStats::get<TestFactory6>, py::return_value_policy::reference)
+        .def_static("get_alias_cstats", &ConstructorStats::get<PyTF6>, py::return_value_policy::reference)
+        ;
+
+    // test_init_factory_dual
+    // Separate alias constructor testing
+    py::class_<TestFactory7, PyTF7, std::shared_ptr<TestFactory7>>(m, "TestFactory7")
+        .def(py::init(
+            [](int i) { return TestFactory7(i); },
+            [](int i) { return PyTF7(i); }))
+        .def(py::init(
+            [](pointer_tag, int i) { return new TestFactory7(i); },
+            [](pointer_tag, int i) { return new PyTF7(i); }))
+        .def(py::init(
+            [](mixed_tag, int i) { return new TestFactory7(i); },
+            [](mixed_tag, int i) { return PyTF7(i); }))
+        .def(py::init(
+            [](mixed_tag, std::string s) { return TestFactory7((int) s.size()); },
+            [](mixed_tag, std::string s) { return new PyTF7((int) s.size()); }))
+        .def(py::init(
+            [](base_tag, pointer_tag, int i) { return new TestFactory7(i); },
+            [](base_tag, pointer_tag, int i) { return (TestFactory7 *) new PyTF7(i); }))
+        .def(py::init(
+            [](alias_tag, pointer_tag, int i) { return new PyTF7(i); },
+            [](alias_tag, pointer_tag, int i) { return new PyTF7(10*i); }))
+        .def(py::init(
+            [](shared_ptr_tag, base_tag, int i) { return std::make_shared<TestFactory7>(i); },
+            [](shared_ptr_tag, base_tag, int i) { auto *p = new PyTF7(i); return std::shared_ptr<TestFactory7>(p); }))
+        .def(py::init(
+            [](shared_ptr_tag, invalid_base_tag, int i) { return std::make_shared<TestFactory7>(i); },
+            [](shared_ptr_tag, invalid_base_tag, int i) { return std::make_shared<TestFactory7>(i); })) // <-- invalid alias factory
+
+        .def("get", &TestFactory7::get)
+        .def("has_alias", &TestFactory7::has_alias)
+
+        .def_static("get_cstats", &ConstructorStats::get<TestFactory7>, py::return_value_policy::reference)
+        .def_static("get_alias_cstats", &ConstructorStats::get<PyTF7>, py::return_value_policy::reference)
+        ;
+
+    // test_placement_new_alternative
+    // Class with a custom new operator but *without* a placement new operator (issue #948)
+    class NoPlacementNew {
+    public:
+        NoPlacementNew(int i) : i(i) { }
+        static void *operator new(std::size_t s) {
+            auto *p = ::operator new(s);
+            py::print("operator new called, returning", reinterpret_cast<uintptr_t>(p));
+            return p;
+        }
+        static void operator delete(void *p) {
+            py::print("operator delete called on", reinterpret_cast<uintptr_t>(p));
+            ::operator delete(p);
+        }
+        int i;
+    };
+    // As of 2.2, `py::init<args>` no longer requires placement new
+    py::class_<NoPlacementNew>(m, "NoPlacementNew")
+        .def(py::init<int>())
+        .def(py::init([]() { return new NoPlacementNew(100); }))
+        .def_readwrite("i", &NoPlacementNew::i)
+        ;
+
+
+    // test_reallocations
+    // Class that has verbose operator_new/operator_delete calls
+    struct NoisyAlloc {
+        NoisyAlloc(const NoisyAlloc &) = default;
+        NoisyAlloc(int i) { py::print(py::str("NoisyAlloc(int {})").format(i)); }
+        NoisyAlloc(double d) { py::print(py::str("NoisyAlloc(double {})").format(d)); }
+        ~NoisyAlloc() { py::print("~NoisyAlloc()"); }
+
+        static void *operator new(size_t s) { py::print("noisy new"); return ::operator new(s); }
+        static void *operator new(size_t, void *p) { py::print("noisy placement new"); return p; }
+        static void operator delete(void *p, size_t) { py::print("noisy delete"); ::operator delete(p); }
+        static void operator delete(void *, void *) { py::print("noisy placement delete"); }
+#if defined(_MSC_VER) && _MSC_VER < 1910
+        // MSVC 2015 bug: the above "noisy delete" isn't invoked (fixed in MSVC 2017)
+        static void operator delete(void *p) { py::print("noisy delete"); ::operator delete(p); }
+#endif
+    };
+    py::class_<NoisyAlloc>(m, "NoisyAlloc")
+        // Since these overloads have the same number of arguments, the dispatcher will try each of
+        // them until the arguments convert.  Thus we can get a pre-allocation here when passing a
+        // single non-integer:
+        .def("__init__", [](NoisyAlloc *a, int i) { new (a) NoisyAlloc(i); }) // Regular constructor, runs first, requires preallocation
+        .def(py::init([](double d) { return new NoisyAlloc(d); }))
+
+        // The two-argument version: first the factory pointer overload.
+        .def(py::init([](int i, int) { return new NoisyAlloc(i); }))
+        // Return-by-value:
+        .def(py::init([](double d, int) { return NoisyAlloc(d); }))
+        // Old-style placement new init; requires preallocation
+        .def("__init__", [](NoisyAlloc &a, double d, double) { new (&a) NoisyAlloc(d); })
+        // Requires deallocation of previous overload preallocated value:
+        .def(py::init([](int i, double) { return new NoisyAlloc(i); }))
+        // Regular again: requires yet another preallocation
+        .def("__init__", [](NoisyAlloc &a, int i, std::string) { new (&a) NoisyAlloc(i); })
+        ;
+
+
+
+
+    // static_assert testing (the following def's should all fail with appropriate compilation errors):
+#if 0
+    struct BadF1Base {};
+    struct BadF1 : BadF1Base {};
+    struct PyBadF1 : BadF1 {};
+    py::class_<BadF1, PyBadF1, std::shared_ptr<BadF1>> bf1(m, "BadF1");
+    // wrapped factory function must return a compatible pointer, holder, or value
+    bf1.def(py::init([]() { return 3; }));
+    // incompatible factory function pointer return type
+    bf1.def(py::init([]() { static int three = 3; return &three; }));
+    // incompatible factory function std::shared_ptr<T> return type: cannot convert shared_ptr<T> to holder
+    // (non-polymorphic base)
+    bf1.def(py::init([]() { return std::shared_ptr<BadF1Base>(new BadF1()); }));
+#endif
+}
diff --git a/3rdparty/pybind11/tests/test_factory_constructors.py b/3rdparty/pybind11/tests/test_factory_constructors.py
new file mode 100644
index 00000000..78a3910a
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_factory_constructors.py
@@ -0,0 +1,459 @@
+import pytest
+import re
+
+from pybind11_tests import factory_constructors as m
+from pybind11_tests.factory_constructors import tag
+from pybind11_tests import ConstructorStats
+
+
+def test_init_factory_basic():
+    """Tests py::init_factory() wrapper around various ways of returning the object"""
+
+    cstats = [ConstructorStats.get(c) for c in [m.TestFactory1, m.TestFactory2, m.TestFactory3]]
+    cstats[0].alive()  # force gc
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    x1 = m.TestFactory1(tag.unique_ptr, 3)
+    assert x1.value == "3"
+    y1 = m.TestFactory1(tag.pointer)
+    assert y1.value == "(empty)"
+    z1 = m.TestFactory1("hi!")
+    assert z1.value == "hi!"
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 3
+
+    x2 = m.TestFactory2(tag.move)
+    assert x2.value == "(empty2)"
+    y2 = m.TestFactory2(tag.pointer, 7)
+    assert y2.value == "7"
+    z2 = m.TestFactory2(tag.unique_ptr, "hi again")
+    assert z2.value == "hi again"
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 6
+
+    x3 = m.TestFactory3(tag.shared_ptr)
+    assert x3.value == "(empty3)"
+    y3 = m.TestFactory3(tag.pointer, 42)
+    assert y3.value == "42"
+    z3 = m.TestFactory3("bye")
+    assert z3.value == "bye"
+
+    with pytest.raises(TypeError) as excinfo:
+        m.TestFactory3(tag.null_ptr)
+    assert str(excinfo.value) == "pybind11::init(): factory function returned nullptr"
+
+    assert [i.alive() for i in cstats] == [3, 3, 3]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 9
+
+    del x1, y2, y3, z3
+    assert [i.alive() for i in cstats] == [2, 2, 1]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 5
+    del x2, x3, y1, z1, z2
+    assert [i.alive() for i in cstats] == [0, 0, 0]
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+    assert [i.values() for i in cstats] == [
+        ["3", "hi!"],
+        ["7", "hi again"],
+        ["42", "bye"]
+    ]
+    assert [i.default_constructions for i in cstats] == [1, 1, 1]
+
+
+def test_init_factory_signature(msg):
+    with pytest.raises(TypeError) as excinfo:
+        m.TestFactory1("invalid", "constructor", "arguments")
+    assert msg(excinfo.value) == """
+        __init__(): incompatible constructor arguments. The following argument types are supported:
+            1. m.factory_constructors.TestFactory1(arg0: m.factory_constructors.tag.unique_ptr_tag, arg1: int)
+            2. m.factory_constructors.TestFactory1(arg0: str)
+            3. m.factory_constructors.TestFactory1(arg0: m.factory_constructors.tag.pointer_tag)
+            4. m.factory_constructors.TestFactory1(arg0: handle, arg1: int, arg2: handle)
+
+        Invoked with: 'invalid', 'constructor', 'arguments'
+    """  # noqa: E501 line too long
+
+    assert msg(m.TestFactory1.__init__.__doc__) == """
+        __init__(*args, **kwargs)
+        Overloaded function.
+
+        1. __init__(self: m.factory_constructors.TestFactory1, arg0: m.factory_constructors.tag.unique_ptr_tag, arg1: int) -> None
+
+        2. __init__(self: m.factory_constructors.TestFactory1, arg0: str) -> None
+
+        3. __init__(self: m.factory_constructors.TestFactory1, arg0: m.factory_constructors.tag.pointer_tag) -> None
+
+        4. __init__(self: m.factory_constructors.TestFactory1, arg0: handle, arg1: int, arg2: handle) -> None
+    """  # noqa: E501 line too long
+
+
+def test_init_factory_casting():
+    """Tests py::init_factory() wrapper with various upcasting and downcasting returns"""
+
+    cstats = [ConstructorStats.get(c) for c in [m.TestFactory3, m.TestFactory4, m.TestFactory5]]
+    cstats[0].alive()  # force gc
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    # Construction from derived references:
+    a = m.TestFactory3(tag.pointer, tag.TF4, 4)
+    assert a.value == "4"
+    b = m.TestFactory3(tag.shared_ptr, tag.TF4, 5)
+    assert b.value == "5"
+    c = m.TestFactory3(tag.pointer, tag.TF5, 6)
+    assert c.value == "6"
+    d = m.TestFactory3(tag.shared_ptr, tag.TF5, 7)
+    assert d.value == "7"
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 4
+
+    # Shared a lambda with TF3:
+    e = m.TestFactory4(tag.pointer, tag.TF4, 8)
+    assert e.value == "8"
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 5
+    assert [i.alive() for i in cstats] == [5, 3, 2]
+
+    del a
+    assert [i.alive() for i in cstats] == [4, 2, 2]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 4
+
+    del b, c, e
+    assert [i.alive() for i in cstats] == [1, 0, 1]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 1
+
+    del d
+    assert [i.alive() for i in cstats] == [0, 0, 0]
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+    assert [i.values() for i in cstats] == [
+        ["4", "5", "6", "7", "8"],
+        ["4", "5", "8"],
+        ["6", "7"]
+    ]
+
+
+def test_init_factory_alias():
+    """Tests py::init_factory() wrapper with value conversions and alias types"""
+
+    cstats = [m.TestFactory6.get_cstats(), m.TestFactory6.get_alias_cstats()]
+    cstats[0].alive()  # force gc
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    a = m.TestFactory6(tag.base, 1)
+    assert a.get() == 1
+    assert not a.has_alias()
+    b = m.TestFactory6(tag.alias, "hi there")
+    assert b.get() == 8
+    assert b.has_alias()
+    c = m.TestFactory6(tag.alias, 3)
+    assert c.get() == 3
+    assert c.has_alias()
+    d = m.TestFactory6(tag.alias, tag.pointer, 4)
+    assert d.get() == 4
+    assert d.has_alias()
+    e = m.TestFactory6(tag.base, tag.pointer, 5)
+    assert e.get() == 5
+    assert not e.has_alias()
+    f = m.TestFactory6(tag.base, tag.alias, tag.pointer, 6)
+    assert f.get() == 6
+    assert f.has_alias()
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 6
+    assert [i.alive() for i in cstats] == [6, 4]
+
+    del a, b, e
+    assert [i.alive() for i in cstats] == [3, 3]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 3
+    del f, c, d
+    assert [i.alive() for i in cstats] == [0, 0]
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+    class MyTest(m.TestFactory6):
+        def __init__(self, *args):
+            m.TestFactory6.__init__(self, *args)
+
+        def get(self):
+            return -5 + m.TestFactory6.get(self)
+
+    # Return Class by value, moved into new alias:
+    z = MyTest(tag.base, 123)
+    assert z.get() == 118
+    assert z.has_alias()
+
+    # Return alias by value, moved into new alias:
+    y = MyTest(tag.alias, "why hello!")
+    assert y.get() == 5
+    assert y.has_alias()
+
+    # Return Class by pointer, moved into new alias then original destroyed:
+    x = MyTest(tag.base, tag.pointer, 47)
+    assert x.get() == 42
+    assert x.has_alias()
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 3
+    assert [i.alive() for i in cstats] == [3, 3]
+    del x, y, z
+    assert [i.alive() for i in cstats] == [0, 0]
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+    assert [i.values() for i in cstats] == [
+        ["1", "8", "3", "4", "5", "6", "123", "10", "47"],
+        ["hi there", "3", "4", "6", "move", "123", "why hello!", "move", "47"]
+    ]
+
+
+def test_init_factory_dual():
+    """Tests init factory functions with dual main/alias factory functions"""
+    from pybind11_tests.factory_constructors import TestFactory7
+
+    cstats = [TestFactory7.get_cstats(), TestFactory7.get_alias_cstats()]
+    cstats[0].alive()  # force gc
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    class PythFactory7(TestFactory7):
+        def get(self):
+            return 100 + TestFactory7.get(self)
+
+    a1 = TestFactory7(1)
+    a2 = PythFactory7(2)
+    assert a1.get() == 1
+    assert a2.get() == 102
+    assert not a1.has_alias()
+    assert a2.has_alias()
+
+    b1 = TestFactory7(tag.pointer, 3)
+    b2 = PythFactory7(tag.pointer, 4)
+    assert b1.get() == 3
+    assert b2.get() == 104
+    assert not b1.has_alias()
+    assert b2.has_alias()
+
+    c1 = TestFactory7(tag.mixed, 5)
+    c2 = PythFactory7(tag.mixed, 6)
+    assert c1.get() == 5
+    assert c2.get() == 106
+    assert not c1.has_alias()
+    assert c2.has_alias()
+
+    d1 = TestFactory7(tag.base, tag.pointer, 7)
+    d2 = PythFactory7(tag.base, tag.pointer, 8)
+    assert d1.get() == 7
+    assert d2.get() == 108
+    assert not d1.has_alias()
+    assert d2.has_alias()
+
+    # Both return an alias; the second multiplies the value by 10:
+    e1 = TestFactory7(tag.alias, tag.pointer, 9)
+    e2 = PythFactory7(tag.alias, tag.pointer, 10)
+    assert e1.get() == 9
+    assert e2.get() == 200
+    assert e1.has_alias()
+    assert e2.has_alias()
+
+    f1 = TestFactory7(tag.shared_ptr, tag.base, 11)
+    f2 = PythFactory7(tag.shared_ptr, tag.base, 12)
+    assert f1.get() == 11
+    assert f2.get() == 112
+    assert not f1.has_alias()
+    assert f2.has_alias()
+
+    g1 = TestFactory7(tag.shared_ptr, tag.invalid_base, 13)
+    assert g1.get() == 13
+    assert not g1.has_alias()
+    with pytest.raises(TypeError) as excinfo:
+        PythFactory7(tag.shared_ptr, tag.invalid_base, 14)
+    assert (str(excinfo.value) ==
+            "pybind11::init(): construction failed: returned holder-wrapped instance is not an "
+            "alias instance")
+
+    assert [i.alive() for i in cstats] == [13, 7]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 13
+
+    del a1, a2, b1, d1, e1, e2
+    assert [i.alive() for i in cstats] == [7, 4]
+    assert ConstructorStats.detail_reg_inst() == n_inst + 7
+    del b2, c1, c2, d2, f1, f2, g1
+    assert [i.alive() for i in cstats] == [0, 0]
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+    assert [i.values() for i in cstats] == [
+        ["1", "2", "3", "4", "5", "6", "7", "8", "9", "100", "11", "12", "13", "14"],
+        ["2", "4", "6", "8", "9", "100", "12"]
+    ]
+
+
+def test_no_placement_new(capture):
+    """Prior to 2.2, `py::init<...>` relied on the type supporting placement
+    new; this tests a class without placement new support."""
+    with capture:
+        a = m.NoPlacementNew(123)
+
+    found = re.search(r'^operator new called, returning (\d+)\n$', str(capture))
+    assert found
+    assert a.i == 123
+    with capture:
+        del a
+        pytest.gc_collect()
+    assert capture == "operator delete called on " + found.group(1)
+
+    with capture:
+        b = m.NoPlacementNew()
+
+    found = re.search(r'^operator new called, returning (\d+)\n$', str(capture))
+    assert found
+    assert b.i == 100
+    with capture:
+        del b
+        pytest.gc_collect()
+    assert capture == "operator delete called on " + found.group(1)
+
+
+def test_multiple_inheritance():
+    class MITest(m.TestFactory1, m.TestFactory2):
+        def __init__(self):
+            m.TestFactory1.__init__(self, tag.unique_ptr, 33)
+            m.TestFactory2.__init__(self, tag.move)
+
+    a = MITest()
+    assert m.TestFactory1.value.fget(a) == "33"
+    assert m.TestFactory2.value.fget(a) == "(empty2)"
+
+
+def create_and_destroy(*args):
+    a = m.NoisyAlloc(*args)
+    print("---")
+    del a
+    pytest.gc_collect()
+
+
+def strip_comments(s):
+    return re.sub(r'\s+#.*', '', s)
+
+
+def test_reallocations(capture, msg):
+    """When the constructor is overloaded, previous overloads can require a preallocated value.
+    This test makes sure that such preallocated values only happen when they might be necessary,
+    and that they are deallocated properly"""
+
+    pytest.gc_collect()
+
+    with capture:
+        create_and_destroy(1)
+    assert msg(capture) == """
+        noisy new
+        noisy placement new
+        NoisyAlloc(int 1)
+        ---
+        ~NoisyAlloc()
+        noisy delete
+    """
+    with capture:
+        create_and_destroy(1.5)
+    assert msg(capture) == strip_comments("""
+        noisy new               # allocation required to attempt first overload
+        noisy delete            # have to dealloc before considering factory init overload
+        noisy new               # pointer factory calling "new", part 1: allocation
+        NoisyAlloc(double 1.5)  # ... part two, invoking constructor
+        ---
+        ~NoisyAlloc()  # Destructor
+        noisy delete   # operator delete
+    """)
+
+    with capture:
+        create_and_destroy(2, 3)
+    assert msg(capture) == strip_comments("""
+        noisy new          # pointer factory calling "new", allocation
+        NoisyAlloc(int 2)  # constructor
+        ---
+        ~NoisyAlloc()  # Destructor
+        noisy delete   # operator delete
+    """)
+
+    with capture:
+        create_and_destroy(2.5, 3)
+    assert msg(capture) == strip_comments("""
+        NoisyAlloc(double 2.5)  # construction (local func variable: operator_new not called)
+        noisy new               # return-by-value "new" part 1: allocation
+        ~NoisyAlloc()           # moved-away local func variable destruction
+        ---
+        ~NoisyAlloc()  # Destructor
+        noisy delete   # operator delete
+    """)
+
+    with capture:
+        create_and_destroy(3.5, 4.5)
+    assert msg(capture) == strip_comments("""
+        noisy new               # preallocation needed before invoking placement-new overload
+        noisy placement new     # Placement new
+        NoisyAlloc(double 3.5)  # construction
+        ---
+        ~NoisyAlloc()  # Destructor
+        noisy delete   # operator delete
+    """)
+
+    with capture:
+        create_and_destroy(4, 0.5)
+    assert msg(capture) == strip_comments("""
+        noisy new          # preallocation needed before invoking placement-new overload
+        noisy delete       # deallocation of preallocated storage
+        noisy new          # Factory pointer allocation
+        NoisyAlloc(int 4)  # factory pointer construction
+        ---
+        ~NoisyAlloc()  # Destructor
+        noisy delete   # operator delete
+    """)
+
+    with capture:
+        create_and_destroy(5, "hi")
+    assert msg(capture) == strip_comments("""
+        noisy new            # preallocation needed before invoking first placement new
+        noisy delete         # delete before considering new-style constructor
+        noisy new            # preallocation for second placement new
+        noisy placement new  # Placement new in the second placement new overload
+        NoisyAlloc(int 5)    # construction
+        ---
+        ~NoisyAlloc()  # Destructor
+        noisy delete   # operator delete
+    """)
+
+
+@pytest.unsupported_on_py2
+def test_invalid_self():
+    """Tests invocation of the pybind-registered base class with an invalid `self` argument.  You
+    can only actually do this on Python 3: Python 2 raises an exception itself if you try."""
+    class NotPybindDerived(object):
+        pass
+
+    # Attempts to initialize with an invalid type passed as `self`:
+    class BrokenTF1(m.TestFactory1):
+        def __init__(self, bad):
+            if bad == 1:
+                a = m.TestFactory2(tag.pointer, 1)
+                m.TestFactory1.__init__(a, tag.pointer)
+            elif bad == 2:
+                a = NotPybindDerived()
+                m.TestFactory1.__init__(a, tag.pointer)
+
+    # Same as above, but for a class with an alias:
+    class BrokenTF6(m.TestFactory6):
+        def __init__(self, bad):
+            if bad == 1:
+                a = m.TestFactory2(tag.pointer, 1)
+                m.TestFactory6.__init__(a, tag.base, 1)
+            elif bad == 2:
+                a = m.TestFactory2(tag.pointer, 1)
+                m.TestFactory6.__init__(a, tag.alias, 1)
+            elif bad == 3:
+                m.TestFactory6.__init__(NotPybindDerived.__new__(NotPybindDerived), tag.base, 1)
+            elif bad == 4:
+                m.TestFactory6.__init__(NotPybindDerived.__new__(NotPybindDerived), tag.alias, 1)
+
+    for arg in (1, 2):
+        with pytest.raises(TypeError) as excinfo:
+            BrokenTF1(arg)
+        assert str(excinfo.value) == "__init__(self, ...) called with invalid `self` argument"
+
+    for arg in (1, 2, 3, 4):
+        with pytest.raises(TypeError) as excinfo:
+            BrokenTF6(arg)
+        assert str(excinfo.value) == "__init__(self, ...) called with invalid `self` argument"
diff --git a/3rdparty/pybind11/tests/test_gil_scoped.cpp b/3rdparty/pybind11/tests/test_gil_scoped.cpp
new file mode 100644
index 00000000..76c17fdc
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_gil_scoped.cpp
@@ -0,0 +1,52 @@
+/*
+    tests/test_gil_scoped.cpp -- acquire and release gil
+
+    Copyright (c) 2017 Borja Zarco (Google LLC) <bzarco@google.com>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/functional.h>
+
+
+class VirtClass  {
+public:
+    virtual ~VirtClass() {}
+    virtual void virtual_func() {}
+    virtual void pure_virtual_func() = 0;
+};
+
+class PyVirtClass : public VirtClass {
+    void virtual_func() override {
+        PYBIND11_OVERLOAD(void, VirtClass, virtual_func,);
+    }
+    void pure_virtual_func() override {
+        PYBIND11_OVERLOAD_PURE(void, VirtClass, pure_virtual_func,);
+    }
+};
+
+TEST_SUBMODULE(gil_scoped, m) {
+  py::class_<VirtClass, PyVirtClass>(m, "VirtClass")
+      .def(py::init<>())
+      .def("virtual_func", &VirtClass::virtual_func)
+      .def("pure_virtual_func", &VirtClass::pure_virtual_func);
+
+    m.def("test_callback_py_obj",
+          [](py::object func) { func(); });
+    m.def("test_callback_std_func",
+          [](const std::function<void()> &func) { func(); });
+    m.def("test_callback_virtual_func",
+          [](VirtClass &virt) { virt.virtual_func(); });
+    m.def("test_callback_pure_virtual_func",
+          [](VirtClass &virt) { virt.pure_virtual_func(); });
+    m.def("test_cross_module_gil",
+          []() {
+              auto cm = py::module::import("cross_module_gil_utils");
+              auto gil_acquire = reinterpret_cast<void (*)()>(
+                  PyLong_AsVoidPtr(cm.attr("gil_acquire_funcaddr").ptr()));
+              py::gil_scoped_release gil_release;
+              gil_acquire();
+          });
+}
diff --git a/3rdparty/pybind11/tests/test_gil_scoped.py b/3rdparty/pybind11/tests/test_gil_scoped.py
new file mode 100644
index 00000000..1548337c
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_gil_scoped.py
@@ -0,0 +1,85 @@
+import multiprocessing
+import threading
+from pybind11_tests import gil_scoped as m
+
+
+def _run_in_process(target, *args, **kwargs):
+    """Runs target in process and returns its exitcode after 10s (None if still alive)."""
+    process = multiprocessing.Process(target=target, args=args, kwargs=kwargs)
+    process.daemon = True
+    try:
+        process.start()
+        # Do not need to wait much, 10s should be more than enough.
+        process.join(timeout=10)
+        return process.exitcode
+    finally:
+        if process.is_alive():
+            process.terminate()
+
+
+def _python_to_cpp_to_python():
+    """Calls different C++ functions that come back to Python."""
+    class ExtendedVirtClass(m.VirtClass):
+        def virtual_func(self):
+            pass
+
+        def pure_virtual_func(self):
+            pass
+
+    extended = ExtendedVirtClass()
+    m.test_callback_py_obj(lambda: None)
+    m.test_callback_std_func(lambda: None)
+    m.test_callback_virtual_func(extended)
+    m.test_callback_pure_virtual_func(extended)
+
+
+def _python_to_cpp_to_python_from_threads(num_threads, parallel=False):
+    """Calls different C++ functions that come back to Python, from Python threads."""
+    threads = []
+    for _ in range(num_threads):
+        thread = threading.Thread(target=_python_to_cpp_to_python)
+        thread.daemon = True
+        thread.start()
+        if parallel:
+            threads.append(thread)
+        else:
+            thread.join()
+    for thread in threads:
+        thread.join()
+
+
+def test_python_to_cpp_to_python_from_thread():
+    """Makes sure there is no GIL deadlock when running in a thread.
+
+    It runs in a separate process to be able to stop and assert if it deadlocks.
+    """
+    assert _run_in_process(_python_to_cpp_to_python_from_threads, 1) == 0
+
+
+def test_python_to_cpp_to_python_from_thread_multiple_parallel():
+    """Makes sure there is no GIL deadlock when running in a thread multiple times in parallel.
+
+    It runs in a separate process to be able to stop and assert if it deadlocks.
+    """
+    assert _run_in_process(_python_to_cpp_to_python_from_threads, 8, parallel=True) == 0
+
+
+def test_python_to_cpp_to_python_from_thread_multiple_sequential():
+    """Makes sure there is no GIL deadlock when running in a thread multiple times sequentially.
+
+    It runs in a separate process to be able to stop and assert if it deadlocks.
+    """
+    assert _run_in_process(_python_to_cpp_to_python_from_threads, 8, parallel=False) == 0
+
+
+def test_python_to_cpp_to_python_from_process():
+    """Makes sure there is no GIL deadlock when using processes.
+
+    This test is for completion, but it was never an issue.
+    """
+    assert _run_in_process(_python_to_cpp_to_python) == 0
+
+
+def test_cross_module_gil():
+    """Makes sure that the GIL can be acquired by another module from a GIL-released state."""
+    m.test_cross_module_gil()  # Should not raise a SIGSEGV
diff --git a/3rdparty/pybind11/tests/test_iostream.cpp b/3rdparty/pybind11/tests/test_iostream.cpp
new file mode 100644
index 00000000..e67f88af
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_iostream.cpp
@@ -0,0 +1,73 @@
+/*
+    tests/test_iostream.cpp -- Usage of scoped_output_redirect
+
+    Copyright (c) 2017 Henry F. Schreiner
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+
+#include <pybind11/iostream.h>
+#include "pybind11_tests.h"
+#include <iostream>
+
+
+void noisy_function(std::string msg, bool flush) {
+
+    std::cout << msg;
+    if (flush)
+        std::cout << std::flush;
+}
+
+void noisy_funct_dual(std::string msg, std::string emsg) {
+    std::cout << msg;
+    std::cerr << emsg;
+}
+
+TEST_SUBMODULE(iostream, m) {
+
+    add_ostream_redirect(m);
+
+    // test_evals
+
+    m.def("captured_output_default", [](std::string msg) {
+        py::scoped_ostream_redirect redir;
+        std::cout << msg << std::flush;
+    });
+
+    m.def("captured_output", [](std::string msg) {
+        py::scoped_ostream_redirect redir(std::cout, py::module::import("sys").attr("stdout"));
+        std::cout << msg << std::flush;
+    });
+
+    m.def("guard_output", &noisy_function,
+            py::call_guard<py::scoped_ostream_redirect>(),
+            py::arg("msg"), py::arg("flush")=true);
+
+    m.def("captured_err", [](std::string msg) {
+        py::scoped_ostream_redirect redir(std::cerr, py::module::import("sys").attr("stderr"));
+        std::cerr << msg << std::flush;
+    });
+
+    m.def("noisy_function", &noisy_function, py::arg("msg"), py::arg("flush") = true);
+
+    m.def("dual_guard", &noisy_funct_dual,
+            py::call_guard<py::scoped_ostream_redirect, py::scoped_estream_redirect>(),
+            py::arg("msg"), py::arg("emsg"));
+
+    m.def("raw_output", [](std::string msg) {
+        std::cout << msg << std::flush;
+    });
+
+    m.def("raw_err", [](std::string msg) {
+        std::cerr << msg << std::flush;
+    });
+
+    m.def("captured_dual", [](std::string msg, std::string emsg) {
+        py::scoped_ostream_redirect redirout(std::cout, py::module::import("sys").attr("stdout"));
+        py::scoped_ostream_redirect redirerr(std::cerr, py::module::import("sys").attr("stderr"));
+        std::cout << msg << std::flush;
+        std::cerr << emsg << std::flush;
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_iostream.py b/3rdparty/pybind11/tests/test_iostream.py
new file mode 100644
index 00000000..27095b27
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_iostream.py
@@ -0,0 +1,214 @@
+from pybind11_tests import iostream as m
+import sys
+
+from contextlib import contextmanager
+
+try:
+    # Python 3
+    from io import StringIO
+except ImportError:
+    # Python 2
+    try:
+        from cStringIO import StringIO
+    except ImportError:
+        from StringIO import StringIO
+
+try:
+    # Python 3.4
+    from contextlib import redirect_stdout
+except ImportError:
+    @contextmanager
+    def redirect_stdout(target):
+        original = sys.stdout
+        sys.stdout = target
+        yield
+        sys.stdout = original
+
+try:
+    # Python 3.5
+    from contextlib import redirect_stderr
+except ImportError:
+    @contextmanager
+    def redirect_stderr(target):
+        original = sys.stderr
+        sys.stderr = target
+        yield
+        sys.stderr = original
+
+
+def test_captured(capsys):
+    msg = "I've been redirected to Python, I hope!"
+    m.captured_output(msg)
+    stdout, stderr = capsys.readouterr()
+    assert stdout == msg
+    assert stderr == ''
+
+    m.captured_output_default(msg)
+    stdout, stderr = capsys.readouterr()
+    assert stdout == msg
+    assert stderr == ''
+
+    m.captured_err(msg)
+    stdout, stderr = capsys.readouterr()
+    assert stdout == ''
+    assert stderr == msg
+
+
+def test_captured_large_string(capsys):
+    # Make this bigger than the buffer used on the C++ side: 1024 chars
+    msg = "I've been redirected to Python, I hope!"
+    msg = msg * (1024 // len(msg) + 1)
+
+    m.captured_output_default(msg)
+    stdout, stderr = capsys.readouterr()
+    assert stdout == msg
+    assert stderr == ''
+
+
+def test_guard_capture(capsys):
+    msg = "I've been redirected to Python, I hope!"
+    m.guard_output(msg)
+    stdout, stderr = capsys.readouterr()
+    assert stdout == msg
+    assert stderr == ''
+
+
+def test_series_captured(capture):
+    with capture:
+        m.captured_output("a")
+        m.captured_output("b")
+    assert capture == "ab"
+
+
+def test_flush(capfd):
+    msg = "(not flushed)"
+    msg2 = "(flushed)"
+
+    with m.ostream_redirect():
+        m.noisy_function(msg, flush=False)
+        stdout, stderr = capfd.readouterr()
+        assert stdout == ''
+
+        m.noisy_function(msg2, flush=True)
+        stdout, stderr = capfd.readouterr()
+        assert stdout == msg + msg2
+
+        m.noisy_function(msg, flush=False)
+
+    stdout, stderr = capfd.readouterr()
+    assert stdout == msg
+
+
+def test_not_captured(capfd):
+    msg = "Something that should not show up in log"
+    stream = StringIO()
+    with redirect_stdout(stream):
+        m.raw_output(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == msg
+    assert stderr == ''
+    assert stream.getvalue() == ''
+
+    stream = StringIO()
+    with redirect_stdout(stream):
+        m.captured_output(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == ''
+    assert stderr == ''
+    assert stream.getvalue() == msg
+
+
+def test_err(capfd):
+    msg = "Something that should not show up in log"
+    stream = StringIO()
+    with redirect_stderr(stream):
+        m.raw_err(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == ''
+    assert stderr == msg
+    assert stream.getvalue() == ''
+
+    stream = StringIO()
+    with redirect_stderr(stream):
+        m.captured_err(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == ''
+    assert stderr == ''
+    assert stream.getvalue() == msg
+
+
+def test_multi_captured(capfd):
+    stream = StringIO()
+    with redirect_stdout(stream):
+        m.captured_output("a")
+        m.raw_output("b")
+        m.captured_output("c")
+        m.raw_output("d")
+    stdout, stderr = capfd.readouterr()
+    assert stdout == 'bd'
+    assert stream.getvalue() == 'ac'
+
+
+def test_dual(capsys):
+    m.captured_dual("a", "b")
+    stdout, stderr = capsys.readouterr()
+    assert stdout == "a"
+    assert stderr == "b"
+
+
+def test_redirect(capfd):
+    msg = "Should not be in log!"
+    stream = StringIO()
+    with redirect_stdout(stream):
+        m.raw_output(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == msg
+    assert stream.getvalue() == ''
+
+    stream = StringIO()
+    with redirect_stdout(stream):
+        with m.ostream_redirect():
+            m.raw_output(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == ''
+    assert stream.getvalue() == msg
+
+    stream = StringIO()
+    with redirect_stdout(stream):
+        m.raw_output(msg)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == msg
+    assert stream.getvalue() == ''
+
+
+def test_redirect_err(capfd):
+    msg = "StdOut"
+    msg2 = "StdErr"
+
+    stream = StringIO()
+    with redirect_stderr(stream):
+        with m.ostream_redirect(stdout=False):
+            m.raw_output(msg)
+            m.raw_err(msg2)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == msg
+    assert stderr == ''
+    assert stream.getvalue() == msg2
+
+
+def test_redirect_both(capfd):
+    msg = "StdOut"
+    msg2 = "StdErr"
+
+    stream = StringIO()
+    stream2 = StringIO()
+    with redirect_stdout(stream):
+        with redirect_stderr(stream2):
+            with m.ostream_redirect():
+                m.raw_output(msg)
+                m.raw_err(msg2)
+    stdout, stderr = capfd.readouterr()
+    assert stdout == ''
+    assert stderr == ''
+    assert stream.getvalue() == msg
+    assert stream2.getvalue() == msg2
diff --git a/3rdparty/pybind11/tests/test_kwargs_and_defaults.cpp b/3rdparty/pybind11/tests/test_kwargs_and_defaults.cpp
new file mode 100644
index 00000000..6563fb9a
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_kwargs_and_defaults.cpp
@@ -0,0 +1,102 @@
+/*
+    tests/test_kwargs_and_defaults.cpp -- keyword arguments and default values
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/stl.h>
+
+TEST_SUBMODULE(kwargs_and_defaults, m) {
+    auto kw_func = [](int x, int y) { return "x=" + std::to_string(x) + ", y=" + std::to_string(y); };
+
+    // test_named_arguments
+    m.def("kw_func0", kw_func);
+    m.def("kw_func1", kw_func, py::arg("x"), py::arg("y"));
+    m.def("kw_func2", kw_func, py::arg("x") = 100, py::arg("y") = 200);
+    m.def("kw_func3", [](const char *) { }, py::arg("data") = std::string("Hello world!"));
+
+    /* A fancier default argument */
+    std::vector<int> list{{13, 17}};
+    m.def("kw_func4", [](const std::vector<int> &entries) {
+        std::string ret = "{";
+        for (int i : entries)
+            ret += std::to_string(i) + " ";
+        ret.back() = '}';
+        return ret;
+    }, py::arg("myList") = list);
+
+    m.def("kw_func_udl", kw_func, "x"_a, "y"_a=300);
+    m.def("kw_func_udl_z", kw_func, "x"_a, "y"_a=0);
+
+    // test_args_and_kwargs
+    m.def("args_function", [](py::args args) -> py::tuple {
+        return std::move(args);
+    });
+    m.def("args_kwargs_function", [](py::args args, py::kwargs kwargs) {
+        return py::make_tuple(args, kwargs);
+    });
+
+    // test_mixed_args_and_kwargs
+    m.def("mixed_plus_args", [](int i, double j, py::args args) {
+        return py::make_tuple(i, j, args);
+    });
+    m.def("mixed_plus_kwargs", [](int i, double j, py::kwargs kwargs) {
+        return py::make_tuple(i, j, kwargs);
+    });
+    auto mixed_plus_both = [](int i, double j, py::args args, py::kwargs kwargs) {
+        return py::make_tuple(i, j, args, kwargs);
+    };
+    m.def("mixed_plus_args_kwargs", mixed_plus_both);
+
+    m.def("mixed_plus_args_kwargs_defaults", mixed_plus_both,
+            py::arg("i") = 1, py::arg("j") = 3.14159);
+
+    // test_args_refcount
+    // PyPy needs a garbage collection to get the reference count values to match CPython's behaviour
+    #ifdef PYPY_VERSION
+    #define GC_IF_NEEDED ConstructorStats::gc()
+    #else
+    #define GC_IF_NEEDED
+    #endif
+    m.def("arg_refcount_h", [](py::handle h) { GC_IF_NEEDED; return h.ref_count(); });
+    m.def("arg_refcount_h", [](py::handle h, py::handle, py::handle) { GC_IF_NEEDED; return h.ref_count(); });
+    m.def("arg_refcount_o", [](py::object o) { GC_IF_NEEDED; return o.ref_count(); });
+    m.def("args_refcount", [](py::args a) {
+        GC_IF_NEEDED;
+        py::tuple t(a.size());
+        for (size_t i = 0; i < a.size(); i++)
+            // Use raw Python API here to avoid an extra, intermediate incref on the tuple item:
+            t[i] = (int) Py_REFCNT(PyTuple_GET_ITEM(a.ptr(), static_cast<ssize_t>(i)));
+        return t;
+    });
+    m.def("mixed_args_refcount", [](py::object o, py::args a) {
+        GC_IF_NEEDED;
+        py::tuple t(a.size() + 1);
+        t[0] = o.ref_count();
+        for (size_t i = 0; i < a.size(); i++)
+            // Use raw Python API here to avoid an extra, intermediate incref on the tuple item:
+            t[i + 1] = (int) Py_REFCNT(PyTuple_GET_ITEM(a.ptr(), static_cast<ssize_t>(i)));
+        return t;
+    });
+
+    // pybind11 won't allow these to be bound: args and kwargs, if present, must be at the end.
+    // Uncomment these to test that the static_assert is indeed working:
+//    m.def("bad_args1", [](py::args, int) {});
+//    m.def("bad_args2", [](py::kwargs, int) {});
+//    m.def("bad_args3", [](py::kwargs, py::args) {});
+//    m.def("bad_args4", [](py::args, int, py::kwargs) {});
+//    m.def("bad_args5", [](py::args, py::kwargs, int) {});
+//    m.def("bad_args6", [](py::args, py::args) {});
+//    m.def("bad_args7", [](py::kwargs, py::kwargs) {});
+
+    // test_function_signatures (along with most of the above)
+    struct KWClass { void foo(int, float) {} };
+    py::class_<KWClass>(m, "KWClass")
+        .def("foo0", &KWClass::foo)
+        .def("foo1", &KWClass::foo, "x"_a, "y"_a);
+}
diff --git a/3rdparty/pybind11/tests/test_kwargs_and_defaults.py b/3rdparty/pybind11/tests/test_kwargs_and_defaults.py
new file mode 100644
index 00000000..27a05a02
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_kwargs_and_defaults.py
@@ -0,0 +1,147 @@
+import pytest
+from pybind11_tests import kwargs_and_defaults as m
+
+
+def test_function_signatures(doc):
+    assert doc(m.kw_func0) == "kw_func0(arg0: int, arg1: int) -> str"
+    assert doc(m.kw_func1) == "kw_func1(x: int, y: int) -> str"
+    assert doc(m.kw_func2) == "kw_func2(x: int = 100, y: int = 200) -> str"
+    assert doc(m.kw_func3) == "kw_func3(data: str = 'Hello world!') -> None"
+    assert doc(m.kw_func4) == "kw_func4(myList: List[int] = [13, 17]) -> str"
+    assert doc(m.kw_func_udl) == "kw_func_udl(x: int, y: int = 300) -> str"
+    assert doc(m.kw_func_udl_z) == "kw_func_udl_z(x: int, y: int = 0) -> str"
+    assert doc(m.args_function) == "args_function(*args) -> tuple"
+    assert doc(m.args_kwargs_function) == "args_kwargs_function(*args, **kwargs) -> tuple"
+    assert doc(m.KWClass.foo0) == \
+        "foo0(self: m.kwargs_and_defaults.KWClass, arg0: int, arg1: float) -> None"
+    assert doc(m.KWClass.foo1) == \
+        "foo1(self: m.kwargs_and_defaults.KWClass, x: int, y: float) -> None"
+
+
+def test_named_arguments(msg):
+    assert m.kw_func0(5, 10) == "x=5, y=10"
+
+    assert m.kw_func1(5, 10) == "x=5, y=10"
+    assert m.kw_func1(5, y=10) == "x=5, y=10"
+    assert m.kw_func1(y=10, x=5) == "x=5, y=10"
+
+    assert m.kw_func2() == "x=100, y=200"
+    assert m.kw_func2(5) == "x=5, y=200"
+    assert m.kw_func2(x=5) == "x=5, y=200"
+    assert m.kw_func2(y=10) == "x=100, y=10"
+    assert m.kw_func2(5, 10) == "x=5, y=10"
+    assert m.kw_func2(x=5, y=10) == "x=5, y=10"
+
+    with pytest.raises(TypeError) as excinfo:
+        # noinspection PyArgumentList
+        m.kw_func2(x=5, y=10, z=12)
+    assert excinfo.match(
+        r'(?s)^kw_func2\(\): incompatible.*Invoked with: kwargs: ((x=5|y=10|z=12)(, |$))' + '{3}$')
+
+    assert m.kw_func4() == "{13 17}"
+    assert m.kw_func4(myList=[1, 2, 3]) == "{1 2 3}"
+
+    assert m.kw_func_udl(x=5, y=10) == "x=5, y=10"
+    assert m.kw_func_udl_z(x=5) == "x=5, y=0"
+
+
+def test_arg_and_kwargs():
+    args = 'arg1_value', 'arg2_value', 3
+    assert m.args_function(*args) == args
+
+    args = 'a1', 'a2'
+    kwargs = dict(arg3='a3', arg4=4)
+    assert m.args_kwargs_function(*args, **kwargs) == (args, kwargs)
+
+
+def test_mixed_args_and_kwargs(msg):
+    mpa = m.mixed_plus_args
+    mpk = m.mixed_plus_kwargs
+    mpak = m.mixed_plus_args_kwargs
+    mpakd = m.mixed_plus_args_kwargs_defaults
+
+    assert mpa(1, 2.5, 4, 99.5, None) == (1, 2.5, (4, 99.5, None))
+    assert mpa(1, 2.5) == (1, 2.5, ())
+    with pytest.raises(TypeError) as excinfo:
+        assert mpa(1)
+    assert msg(excinfo.value) == """
+        mixed_plus_args(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: int, arg1: float, *args) -> tuple
+
+        Invoked with: 1
+    """  # noqa: E501 line too long
+    with pytest.raises(TypeError) as excinfo:
+        assert mpa()
+    assert msg(excinfo.value) == """
+        mixed_plus_args(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: int, arg1: float, *args) -> tuple
+
+        Invoked with:
+    """  # noqa: E501 line too long
+
+    assert mpk(-2, 3.5, pi=3.14159, e=2.71828) == (-2, 3.5, {'e': 2.71828, 'pi': 3.14159})
+    assert mpak(7, 7.7, 7.77, 7.777, 7.7777, minusseven=-7) == (
+        7, 7.7, (7.77, 7.777, 7.7777), {'minusseven': -7})
+    assert mpakd() == (1, 3.14159, (), {})
+    assert mpakd(3) == (3, 3.14159, (), {})
+    assert mpakd(j=2.71828) == (1, 2.71828, (), {})
+    assert mpakd(k=42) == (1, 3.14159, (), {'k': 42})
+    assert mpakd(1, 1, 2, 3, 5, 8, then=13, followedby=21) == (
+        1, 1, (2, 3, 5, 8), {'then': 13, 'followedby': 21})
+    # Arguments specified both positionally and via kwargs should fail:
+    with pytest.raises(TypeError) as excinfo:
+        assert mpakd(1, i=1)
+    assert msg(excinfo.value) == """
+        mixed_plus_args_kwargs_defaults(): incompatible function arguments. The following argument types are supported:
+            1. (i: int = 1, j: float = 3.14159, *args, **kwargs) -> tuple
+
+        Invoked with: 1; kwargs: i=1
+    """  # noqa: E501 line too long
+    with pytest.raises(TypeError) as excinfo:
+        assert mpakd(1, 2, j=1)
+    assert msg(excinfo.value) == """
+        mixed_plus_args_kwargs_defaults(): incompatible function arguments. The following argument types are supported:
+            1. (i: int = 1, j: float = 3.14159, *args, **kwargs) -> tuple
+
+        Invoked with: 1, 2; kwargs: j=1
+    """  # noqa: E501 line too long
+
+
+def test_args_refcount():
+    """Issue/PR #1216 - py::args elements get double-inc_ref()ed when combined with regular
+    arguments"""
+    refcount = m.arg_refcount_h
+
+    myval = 54321
+    expected = refcount(myval)
+    assert m.arg_refcount_h(myval) == expected
+    assert m.arg_refcount_o(myval) == expected + 1
+    assert m.arg_refcount_h(myval) == expected
+    assert refcount(myval) == expected
+
+    assert m.mixed_plus_args(1, 2.0, "a", myval) == (1, 2.0, ("a", myval))
+    assert refcount(myval) == expected
+
+    assert m.mixed_plus_kwargs(3, 4.0, a=1, b=myval) == (3, 4.0, {"a": 1, "b": myval})
+    assert refcount(myval) == expected
+
+    assert m.args_function(-1, myval) == (-1, myval)
+    assert refcount(myval) == expected
+
+    assert m.mixed_plus_args_kwargs(5, 6.0, myval, a=myval) == (5, 6.0, (myval,), {"a": myval})
+    assert refcount(myval) == expected
+
+    assert m.args_kwargs_function(7, 8, myval, a=1, b=myval) == \
+        ((7, 8, myval), {"a": 1, "b": myval})
+    assert refcount(myval) == expected
+
+    exp3 = refcount(myval, myval, myval)
+    assert m.args_refcount(myval, myval, myval) == (exp3, exp3, exp3)
+    assert refcount(myval) == expected
+
+    # This function takes the first arg as a `py::object` and the rest as a `py::args`.  Unlike the
+    # previous case, when we have both positional and `py::args` we need to construct a new tuple
+    # for the `py::args`; in the previous case, we could simply inc_ref and pass on Python's input
+    # tuple without having to inc_ref the individual elements, but here we can't, hence the extra
+    # refs.
+    assert m.mixed_args_refcount(myval, myval, myval) == (exp3 + 3, exp3 + 3, exp3 + 3)
diff --git a/3rdparty/pybind11/tests/test_local_bindings.cpp b/3rdparty/pybind11/tests/test_local_bindings.cpp
new file mode 100644
index 00000000..97c02dbe
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_local_bindings.cpp
@@ -0,0 +1,101 @@
+/*
+    tests/test_local_bindings.cpp -- tests the py::module_local class feature which makes a class
+                                     binding local to the module in which it is defined.
+
+    Copyright (c) 2017 Jason Rhinelander <jason@imaginary.ca>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "local_bindings.h"
+#include <pybind11/stl.h>
+#include <pybind11/stl_bind.h>
+#include <numeric>
+
+TEST_SUBMODULE(local_bindings, m) {
+    // test_load_external
+    m.def("load_external1", [](ExternalType1 &e) { return e.i; });
+    m.def("load_external2", [](ExternalType2 &e) { return e.i; });
+
+    // test_local_bindings
+    // Register a class with py::module_local:
+    bind_local<LocalType, -1>(m, "LocalType", py::module_local())
+        .def("get3", [](LocalType &t) { return t.i + 3; })
+        ;
+
+    m.def("local_value", [](LocalType &l) { return l.i; });
+
+    // test_nonlocal_failure
+    // The main pybind11 test module is loaded first, so this registration will succeed (the second
+    // one, in pybind11_cross_module_tests.cpp, is designed to fail):
+    bind_local<NonLocalType, 0>(m, "NonLocalType")
+        .def(py::init<int>())
+        .def("get", [](LocalType &i) { return i.i; })
+        ;
+
+    // test_duplicate_local
+    // py::module_local declarations should be visible across compilation units that get linked together;
+    // this tries to register a duplicate local.  It depends on a definition in test_class.cpp and
+    // should raise a runtime error from the duplicate definition attempt.  If test_class isn't
+    // available it *also* throws a runtime error (with "test_class not enabled" as value).
+    m.def("register_local_external", [m]() {
+        auto main = py::module::import("pybind11_tests");
+        if (py::hasattr(main, "class_")) {
+            bind_local<LocalExternal, 7>(m, "LocalExternal", py::module_local());
+        }
+        else throw std::runtime_error("test_class not enabled");
+    });
+
+    // test_stl_bind_local
+    // stl_bind.h binders defaults to py::module_local if the types are local or converting:
+    py::bind_vector<LocalVec>(m, "LocalVec");
+    py::bind_map<LocalMap>(m, "LocalMap");
+    // and global if the type (or one of the types, for the map) is global:
+    py::bind_vector<NonLocalVec>(m, "NonLocalVec");
+    py::bind_map<NonLocalMap>(m, "NonLocalMap");
+
+    // test_stl_bind_global
+    // They can, however, be overridden to global using `py::module_local(false)`:
+    bind_local<NonLocal2, 10>(m, "NonLocal2");
+    py::bind_vector<LocalVec2>(m, "LocalVec2", py::module_local());
+    py::bind_map<NonLocalMap2>(m, "NonLocalMap2", py::module_local(false));
+
+    // test_mixed_local_global
+    // We try this both with the global type registered first and vice versa (the order shouldn't
+    // matter).
+    m.def("register_mixed_global", [m]() {
+        bind_local<MixedGlobalLocal, 100>(m, "MixedGlobalLocal", py::module_local(false));
+    });
+    m.def("register_mixed_local", [m]() {
+        bind_local<MixedLocalGlobal, 1000>(m, "MixedLocalGlobal", py::module_local());
+    });
+    m.def("get_mixed_gl", [](int i) { return MixedGlobalLocal(i); });
+    m.def("get_mixed_lg", [](int i) { return MixedLocalGlobal(i); });
+
+    // test_internal_locals_differ
+    m.def("local_cpp_types_addr", []() { return (uintptr_t) &py::detail::registered_local_types_cpp(); });
+
+    // test_stl_caster_vs_stl_bind
+    m.def("load_vector_via_caster", [](std::vector<int> v) {
+        return std::accumulate(v.begin(), v.end(), 0);
+    });
+
+    // test_cross_module_calls
+    m.def("return_self", [](LocalVec *v) { return v; });
+    m.def("return_copy", [](const LocalVec &v) { return LocalVec(v); });
+
+    class Cat : public pets::Pet { public: Cat(std::string name) : Pet(name) {}; };
+    py::class_<pets::Pet>(m, "Pet", py::module_local())
+        .def("get_name", &pets::Pet::name);
+    // Binding for local extending class:
+    py::class_<Cat, pets::Pet>(m, "Cat")
+        .def(py::init<std::string>());
+    m.def("pet_name", [](pets::Pet &p) { return p.name(); });
+
+    py::class_<MixGL>(m, "MixGL").def(py::init<int>());
+    m.def("get_gl_value", [](MixGL &o) { return o.i + 10; });
+
+    py::class_<MixGL2>(m, "MixGL2").def(py::init<int>());
+}
diff --git a/3rdparty/pybind11/tests/test_local_bindings.py b/3rdparty/pybind11/tests/test_local_bindings.py
new file mode 100644
index 00000000..b380376e
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_local_bindings.py
@@ -0,0 +1,226 @@
+import pytest
+
+from pybind11_tests import local_bindings as m
+
+
+def test_load_external():
+    """Load a `py::module_local` type that's only registered in an external module"""
+    import pybind11_cross_module_tests as cm
+
+    assert m.load_external1(cm.ExternalType1(11)) == 11
+    assert m.load_external2(cm.ExternalType2(22)) == 22
+
+    with pytest.raises(TypeError) as excinfo:
+        assert m.load_external2(cm.ExternalType1(21)) == 21
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    with pytest.raises(TypeError) as excinfo:
+        assert m.load_external1(cm.ExternalType2(12)) == 12
+    assert "incompatible function arguments" in str(excinfo.value)
+
+
+def test_local_bindings():
+    """Tests that duplicate `py::module_local` class bindings work across modules"""
+
+    # Make sure we can load the second module with the conflicting (but local) definition:
+    import pybind11_cross_module_tests as cm
+
+    i1 = m.LocalType(5)
+    assert i1.get() == 4
+    assert i1.get3() == 8
+
+    i2 = cm.LocalType(10)
+    assert i2.get() == 11
+    assert i2.get2() == 12
+
+    assert not hasattr(i1, 'get2')
+    assert not hasattr(i2, 'get3')
+
+    # Loading within the local module
+    assert m.local_value(i1) == 5
+    assert cm.local_value(i2) == 10
+
+    # Cross-module loading works as well (on failure, the type loader looks for
+    # external module-local converters):
+    assert m.local_value(i2) == 10
+    assert cm.local_value(i1) == 5
+
+
+def test_nonlocal_failure():
+    """Tests that attempting to register a non-local type in multiple modules fails"""
+    import pybind11_cross_module_tests as cm
+
+    with pytest.raises(RuntimeError) as excinfo:
+        cm.register_nonlocal()
+    assert str(excinfo.value) == 'generic_type: type "NonLocalType" is already registered!'
+
+
+def test_duplicate_local():
+    """Tests expected failure when registering a class twice with py::local in the same module"""
+    with pytest.raises(RuntimeError) as excinfo:
+        m.register_local_external()
+    import pybind11_tests
+    assert str(excinfo.value) == (
+        'generic_type: type "LocalExternal" is already registered!'
+        if hasattr(pybind11_tests, 'class_') else 'test_class not enabled')
+
+
+def test_stl_bind_local():
+    import pybind11_cross_module_tests as cm
+
+    v1, v2 = m.LocalVec(), cm.LocalVec()
+    v1.append(m.LocalType(1))
+    v1.append(m.LocalType(2))
+    v2.append(cm.LocalType(1))
+    v2.append(cm.LocalType(2))
+
+    # Cross module value loading:
+    v1.append(cm.LocalType(3))
+    v2.append(m.LocalType(3))
+
+    assert [i.get() for i in v1] == [0, 1, 2]
+    assert [i.get() for i in v2] == [2, 3, 4]
+
+    v3, v4 = m.NonLocalVec(), cm.NonLocalVec2()
+    v3.append(m.NonLocalType(1))
+    v3.append(m.NonLocalType(2))
+    v4.append(m.NonLocal2(3))
+    v4.append(m.NonLocal2(4))
+
+    assert [i.get() for i in v3] == [1, 2]
+    assert [i.get() for i in v4] == [13, 14]
+
+    d1, d2 = m.LocalMap(), cm.LocalMap()
+    d1["a"] = v1[0]
+    d1["b"] = v1[1]
+    d2["c"] = v2[0]
+    d2["d"] = v2[1]
+    assert {i: d1[i].get() for i in d1} == {'a': 0, 'b': 1}
+    assert {i: d2[i].get() for i in d2} == {'c': 2, 'd': 3}
+
+
+def test_stl_bind_global():
+    import pybind11_cross_module_tests as cm
+
+    with pytest.raises(RuntimeError) as excinfo:
+        cm.register_nonlocal_map()
+    assert str(excinfo.value) == 'generic_type: type "NonLocalMap" is already registered!'
+
+    with pytest.raises(RuntimeError) as excinfo:
+        cm.register_nonlocal_vec()
+    assert str(excinfo.value) == 'generic_type: type "NonLocalVec" is already registered!'
+
+    with pytest.raises(RuntimeError) as excinfo:
+        cm.register_nonlocal_map2()
+    assert str(excinfo.value) == 'generic_type: type "NonLocalMap2" is already registered!'
+
+
+def test_mixed_local_global():
+    """Local types take precedence over globally registered types: a module with a `module_local`
+    type can be registered even if the type is already registered globally.  With the module,
+    casting will go to the local type; outside the module casting goes to the global type."""
+    import pybind11_cross_module_tests as cm
+    m.register_mixed_global()
+    m.register_mixed_local()
+
+    a = []
+    a.append(m.MixedGlobalLocal(1))
+    a.append(m.MixedLocalGlobal(2))
+    a.append(m.get_mixed_gl(3))
+    a.append(m.get_mixed_lg(4))
+
+    assert [x.get() for x in a] == [101, 1002, 103, 1004]
+
+    cm.register_mixed_global_local()
+    cm.register_mixed_local_global()
+    a.append(m.MixedGlobalLocal(5))
+    a.append(m.MixedLocalGlobal(6))
+    a.append(cm.MixedGlobalLocal(7))
+    a.append(cm.MixedLocalGlobal(8))
+    a.append(m.get_mixed_gl(9))
+    a.append(m.get_mixed_lg(10))
+    a.append(cm.get_mixed_gl(11))
+    a.append(cm.get_mixed_lg(12))
+
+    assert [x.get() for x in a] == \
+        [101, 1002, 103, 1004, 105, 1006, 207, 2008, 109, 1010, 211, 2012]
+
+
+def test_internal_locals_differ():
+    """Makes sure the internal local type map differs across the two modules"""
+    import pybind11_cross_module_tests as cm
+    assert m.local_cpp_types_addr() != cm.local_cpp_types_addr()
+
+
+def test_stl_caster_vs_stl_bind(msg):
+    """One module uses a generic vector caster from `<pybind11/stl.h>` while the other
+    exports `std::vector<int>` via `py:bind_vector` and `py::module_local`"""
+    import pybind11_cross_module_tests as cm
+
+    v1 = cm.VectorInt([1, 2, 3])
+    assert m.load_vector_via_caster(v1) == 6
+    assert cm.load_vector_via_binding(v1) == 6
+
+    v2 = [1, 2, 3]
+    assert m.load_vector_via_caster(v2) == 6
+    with pytest.raises(TypeError) as excinfo:
+        cm.load_vector_via_binding(v2) == 6
+    assert msg(excinfo.value) == """
+    load_vector_via_binding(): incompatible function arguments. The following argument types are supported:
+        1. (arg0: pybind11_cross_module_tests.VectorInt) -> int
+
+    Invoked with: [1, 2, 3]
+    """  # noqa: E501 line too long
+
+
+def test_cross_module_calls():
+    import pybind11_cross_module_tests as cm
+
+    v1 = m.LocalVec()
+    v1.append(m.LocalType(1))
+    v2 = cm.LocalVec()
+    v2.append(cm.LocalType(2))
+
+    # Returning the self pointer should get picked up as returning an existing
+    # instance (even when that instance is of a foreign, non-local type).
+    assert m.return_self(v1) is v1
+    assert cm.return_self(v2) is v2
+    assert m.return_self(v2) is v2
+    assert cm.return_self(v1) is v1
+
+    assert m.LocalVec is not cm.LocalVec
+    # Returning a copy, on the other hand, always goes to the local type,
+    # regardless of where the source type came from.
+    assert type(m.return_copy(v1)) is m.LocalVec
+    assert type(m.return_copy(v2)) is m.LocalVec
+    assert type(cm.return_copy(v1)) is cm.LocalVec
+    assert type(cm.return_copy(v2)) is cm.LocalVec
+
+    # Test the example given in the documentation (which also tests inheritance casting):
+    mycat = m.Cat("Fluffy")
+    mydog = cm.Dog("Rover")
+    assert mycat.get_name() == "Fluffy"
+    assert mydog.name() == "Rover"
+    assert m.Cat.__base__.__name__ == "Pet"
+    assert cm.Dog.__base__.__name__ == "Pet"
+    assert m.Cat.__base__ is not cm.Dog.__base__
+    assert m.pet_name(mycat) == "Fluffy"
+    assert m.pet_name(mydog) == "Rover"
+    assert cm.pet_name(mycat) == "Fluffy"
+    assert cm.pet_name(mydog) == "Rover"
+
+    assert m.MixGL is not cm.MixGL
+    a = m.MixGL(1)
+    b = cm.MixGL(2)
+    assert m.get_gl_value(a) == 11
+    assert m.get_gl_value(b) == 12
+    assert cm.get_gl_value(a) == 101
+    assert cm.get_gl_value(b) == 102
+
+    c, d = m.MixGL2(3), cm.MixGL2(4)
+    with pytest.raises(TypeError) as excinfo:
+        m.get_gl_value(c)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.get_gl_value(d)
+    assert "incompatible function arguments" in str(excinfo.value)
diff --git a/3rdparty/pybind11/tests/test_methods_and_attributes.cpp b/3rdparty/pybind11/tests/test_methods_and_attributes.cpp
new file mode 100644
index 00000000..c7b82f13
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_methods_and_attributes.cpp
@@ -0,0 +1,460 @@
+/*
+    tests/test_methods_and_attributes.cpp -- constructors, deconstructors, attribute access,
+    __str__, argument and return value conventions
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+
+#if !defined(PYBIND11_OVERLOAD_CAST)
+template <typename... Args>
+using overload_cast_ = pybind11::detail::overload_cast_impl<Args...>;
+#endif
+
+class ExampleMandA {
+public:
+    ExampleMandA() { print_default_created(this); }
+    ExampleMandA(int value) : value(value) { print_created(this, value); }
+    ExampleMandA(const ExampleMandA &e) : value(e.value) { print_copy_created(this); }
+    ExampleMandA(ExampleMandA &&e) : value(e.value) { print_move_created(this); }
+    ~ExampleMandA() { print_destroyed(this); }
+
+    std::string toString() {
+        return "ExampleMandA[value=" + std::to_string(value) + "]";
+    }
+
+    void operator=(const ExampleMandA &e) { print_copy_assigned(this); value = e.value; }
+    void operator=(ExampleMandA &&e) { print_move_assigned(this); value = e.value; }
+
+    void add1(ExampleMandA other) { value += other.value; }         // passing by value
+    void add2(ExampleMandA &other) { value += other.value; }        // passing by reference
+    void add3(const ExampleMandA &other) { value += other.value; }  // passing by const reference
+    void add4(ExampleMandA *other) { value += other->value; }       // passing by pointer
+    void add5(const ExampleMandA *other) { value += other->value; } // passing by const pointer
+
+    void add6(int other) { value += other; }                        // passing by value
+    void add7(int &other) { value += other; }                       // passing by reference
+    void add8(const int &other) { value += other; }                 // passing by const reference
+    void add9(int *other) { value += *other; }                      // passing by pointer
+    void add10(const int *other) { value += *other; }               // passing by const pointer
+
+    ExampleMandA self1() { return *this; }                          // return by value
+    ExampleMandA &self2() { return *this; }                         // return by reference
+    const ExampleMandA &self3() { return *this; }                   // return by const reference
+    ExampleMandA *self4() { return this; }                          // return by pointer
+    const ExampleMandA *self5() { return this; }                    // return by const pointer
+
+    int internal1() { return value; }                               // return by value
+    int &internal2() { return value; }                              // return by reference
+    const int &internal3() { return value; }                        // return by const reference
+    int *internal4() { return &value; }                             // return by pointer
+    const int *internal5() { return &value; }                       // return by const pointer
+
+    py::str overloaded()             { return "()"; }
+    py::str overloaded(int)          { return "(int)"; }
+    py::str overloaded(int, float)   { return "(int, float)"; }
+    py::str overloaded(float, int)   { return "(float, int)"; }
+    py::str overloaded(int, int)     { return "(int, int)"; }
+    py::str overloaded(float, float) { return "(float, float)"; }
+    py::str overloaded(int)          const { return "(int) const"; }
+    py::str overloaded(int, float)   const { return "(int, float) const"; }
+    py::str overloaded(float, int)   const { return "(float, int) const"; }
+    py::str overloaded(int, int)     const { return "(int, int) const"; }
+    py::str overloaded(float, float) const { return "(float, float) const"; }
+
+    static py::str overloaded(float) { return "static float"; }
+
+    int value = 0;
+};
+
+struct TestProperties {
+    int value = 1;
+    static int static_value;
+
+    int get() const { return value; }
+    void set(int v) { value = v; }
+
+    static int static_get() { return static_value; }
+    static void static_set(int v) { static_value = v; }
+};
+int TestProperties::static_value = 1;
+
+struct TestPropertiesOverride : TestProperties {
+    int value = 99;
+    static int static_value;
+};
+int TestPropertiesOverride::static_value = 99;
+
+struct TestPropRVP {
+    UserType v1{1};
+    UserType v2{1};
+    static UserType sv1;
+    static UserType sv2;
+
+    const UserType &get1() const { return v1; }
+    const UserType &get2() const { return v2; }
+    UserType get_rvalue() const { return v2; }
+    void set1(int v) { v1.set(v); }
+    void set2(int v) { v2.set(v); }
+};
+UserType TestPropRVP::sv1(1);
+UserType TestPropRVP::sv2(1);
+
+// py::arg/py::arg_v testing: these arguments just record their argument when invoked
+class ArgInspector1 { public: std::string arg = "(default arg inspector 1)"; };
+class ArgInspector2 { public: std::string arg = "(default arg inspector 2)"; };
+class ArgAlwaysConverts { };
+namespace pybind11 { namespace detail {
+template <> struct type_caster<ArgInspector1> {
+public:
+    PYBIND11_TYPE_CASTER(ArgInspector1, _("ArgInspector1"));
+
+    bool load(handle src, bool convert) {
+        value.arg = "loading ArgInspector1 argument " +
+            std::string(convert ? "WITH" : "WITHOUT") + " conversion allowed.  "
+            "Argument value = " + (std::string) str(src);
+        return true;
+    }
+
+    static handle cast(const ArgInspector1 &src, return_value_policy, handle) {
+        return str(src.arg).release();
+    }
+};
+template <> struct type_caster<ArgInspector2> {
+public:
+    PYBIND11_TYPE_CASTER(ArgInspector2, _("ArgInspector2"));
+
+    bool load(handle src, bool convert) {
+        value.arg = "loading ArgInspector2 argument " +
+            std::string(convert ? "WITH" : "WITHOUT") + " conversion allowed.  "
+            "Argument value = " + (std::string) str(src);
+        return true;
+    }
+
+    static handle cast(const ArgInspector2 &src, return_value_policy, handle) {
+        return str(src.arg).release();
+    }
+};
+template <> struct type_caster<ArgAlwaysConverts> {
+public:
+    PYBIND11_TYPE_CASTER(ArgAlwaysConverts, _("ArgAlwaysConverts"));
+
+    bool load(handle, bool convert) {
+        return convert;
+    }
+
+    static handle cast(const ArgAlwaysConverts &, return_value_policy, handle) {
+        return py::none().release();
+    }
+};
+}}
+
+// test_custom_caster_destruction
+class DestructionTester {
+public:
+    DestructionTester() { print_default_created(this); }
+    ~DestructionTester() { print_destroyed(this); }
+    DestructionTester(const DestructionTester &) { print_copy_created(this); }
+    DestructionTester(DestructionTester &&) { print_move_created(this); }
+    DestructionTester &operator=(const DestructionTester &) { print_copy_assigned(this); return *this; }
+    DestructionTester &operator=(DestructionTester &&) { print_move_assigned(this); return *this; }
+};
+namespace pybind11 { namespace detail {
+template <> struct type_caster<DestructionTester> {
+    PYBIND11_TYPE_CASTER(DestructionTester, _("DestructionTester"));
+    bool load(handle, bool) { return true; }
+
+    static handle cast(const DestructionTester &, return_value_policy, handle) {
+        return py::bool_(true).release();
+    }
+};
+}}
+
+// Test None-allowed py::arg argument policy
+class NoneTester { public: int answer = 42; };
+int none1(const NoneTester &obj) { return obj.answer; }
+int none2(NoneTester *obj) { return obj ? obj->answer : -1; }
+int none3(std::shared_ptr<NoneTester> &obj) { return obj ? obj->answer : -1; }
+int none4(std::shared_ptr<NoneTester> *obj) { return obj && *obj ? (*obj)->answer : -1; }
+int none5(std::shared_ptr<NoneTester> obj) { return obj ? obj->answer : -1; }
+
+struct StrIssue {
+    int val = -1;
+
+    StrIssue() = default;
+    StrIssue(int i) : val{i} {}
+};
+
+// Issues #854, #910: incompatible function args when member function/pointer is in unregistered base class
+class UnregisteredBase {
+public:
+    void do_nothing() const {}
+    void increase_value() { rw_value++; ro_value += 0.25; }
+    void set_int(int v) { rw_value = v; }
+    int get_int() const { return rw_value; }
+    double get_double() const { return ro_value; }
+    int rw_value = 42;
+    double ro_value = 1.25;
+};
+class RegisteredDerived : public UnregisteredBase {
+public:
+    using UnregisteredBase::UnregisteredBase;
+    double sum() const { return rw_value + ro_value; }
+};
+
+TEST_SUBMODULE(methods_and_attributes, m) {
+    // test_methods_and_attributes
+    py::class_<ExampleMandA> emna(m, "ExampleMandA");
+    emna.def(py::init<>())
+        .def(py::init<int>())
+        .def(py::init<const ExampleMandA&>())
+        .def("add1", &ExampleMandA::add1)
+        .def("add2", &ExampleMandA::add2)
+        .def("add3", &ExampleMandA::add3)
+        .def("add4", &ExampleMandA::add4)
+        .def("add5", &ExampleMandA::add5)
+        .def("add6", &ExampleMandA::add6)
+        .def("add7", &ExampleMandA::add7)
+        .def("add8", &ExampleMandA::add8)
+        .def("add9", &ExampleMandA::add9)
+        .def("add10", &ExampleMandA::add10)
+        .def("self1", &ExampleMandA::self1)
+        .def("self2", &ExampleMandA::self2)
+        .def("self3", &ExampleMandA::self3)
+        .def("self4", &ExampleMandA::self4)
+        .def("self5", &ExampleMandA::self5)
+        .def("internal1", &ExampleMandA::internal1)
+        .def("internal2", &ExampleMandA::internal2)
+        .def("internal3", &ExampleMandA::internal3)
+        .def("internal4", &ExampleMandA::internal4)
+        .def("internal5", &ExampleMandA::internal5)
+#if defined(PYBIND11_OVERLOAD_CAST)
+        .def("overloaded", py::overload_cast<>(&ExampleMandA::overloaded))
+        .def("overloaded", py::overload_cast<int>(&ExampleMandA::overloaded))
+        .def("overloaded", py::overload_cast<int,   float>(&ExampleMandA::overloaded))
+        .def("overloaded", py::overload_cast<float,   int>(&ExampleMandA::overloaded))
+        .def("overloaded", py::overload_cast<int,     int>(&ExampleMandA::overloaded))
+        .def("overloaded", py::overload_cast<float, float>(&ExampleMandA::overloaded))
+        .def("overloaded_float", py::overload_cast<float, float>(&ExampleMandA::overloaded))
+        .def("overloaded_const", py::overload_cast<int         >(&ExampleMandA::overloaded, py::const_))
+        .def("overloaded_const", py::overload_cast<int,   float>(&ExampleMandA::overloaded, py::const_))
+        .def("overloaded_const", py::overload_cast<float,   int>(&ExampleMandA::overloaded, py::const_))
+        .def("overloaded_const", py::overload_cast<int,     int>(&ExampleMandA::overloaded, py::const_))
+        .def("overloaded_const", py::overload_cast<float, float>(&ExampleMandA::overloaded, py::const_))
+#else
+        // Use both the traditional static_cast method and the C++11 compatible overload_cast_
+        .def("overloaded", overload_cast_<>()(&ExampleMandA::overloaded))
+        .def("overloaded", overload_cast_<int>()(&ExampleMandA::overloaded))
+        .def("overloaded", overload_cast_<int,   float>()(&ExampleMandA::overloaded))
+        .def("overloaded", static_cast<py::str (ExampleMandA::*)(float,   int)>(&ExampleMandA::overloaded))
+        .def("overloaded", static_cast<py::str (ExampleMandA::*)(int,     int)>(&ExampleMandA::overloaded))
+        .def("overloaded", static_cast<py::str (ExampleMandA::*)(float, float)>(&ExampleMandA::overloaded))
+        .def("overloaded_float", overload_cast_<float, float>()(&ExampleMandA::overloaded))
+        .def("overloaded_const", overload_cast_<int         >()(&ExampleMandA::overloaded, py::const_))
+        .def("overloaded_const", overload_cast_<int,   float>()(&ExampleMandA::overloaded, py::const_))
+        .def("overloaded_const", static_cast<py::str (ExampleMandA::*)(float,   int) const>(&ExampleMandA::overloaded))
+        .def("overloaded_const", static_cast<py::str (ExampleMandA::*)(int,     int) const>(&ExampleMandA::overloaded))
+        .def("overloaded_const", static_cast<py::str (ExampleMandA::*)(float, float) const>(&ExampleMandA::overloaded))
+#endif
+        // test_no_mixed_overloads
+        // Raise error if trying to mix static/non-static overloads on the same name:
+        .def_static("add_mixed_overloads1", []() {
+            auto emna = py::reinterpret_borrow<py::class_<ExampleMandA>>(py::module::import("pybind11_tests.methods_and_attributes").attr("ExampleMandA"));
+            emna.def       ("overload_mixed1", static_cast<py::str (ExampleMandA::*)(int, int)>(&ExampleMandA::overloaded))
+                .def_static("overload_mixed1", static_cast<py::str (              *)(float   )>(&ExampleMandA::overloaded));
+        })
+        .def_static("add_mixed_overloads2", []() {
+            auto emna = py::reinterpret_borrow<py::class_<ExampleMandA>>(py::module::import("pybind11_tests.methods_and_attributes").attr("ExampleMandA"));
+            emna.def_static("overload_mixed2", static_cast<py::str (              *)(float   )>(&ExampleMandA::overloaded))
+                .def       ("overload_mixed2", static_cast<py::str (ExampleMandA::*)(int, int)>(&ExampleMandA::overloaded));
+        })
+        .def("__str__", &ExampleMandA::toString)
+        .def_readwrite("value", &ExampleMandA::value);
+
+    // test_copy_method
+    // Issue #443: can't call copied methods in Python 3
+    emna.attr("add2b") = emna.attr("add2");
+
+    // test_properties, test_static_properties, test_static_cls
+    py::class_<TestProperties>(m, "TestProperties")
+        .def(py::init<>())
+        .def_readonly("def_readonly", &TestProperties::value)
+        .def_readwrite("def_readwrite", &TestProperties::value)
+        .def_property("def_writeonly", nullptr,
+                      [](TestProperties& s,int v) { s.value = v; } )
+        .def_property("def_property_writeonly", nullptr, &TestProperties::set)
+        .def_property_readonly("def_property_readonly", &TestProperties::get)
+        .def_property("def_property", &TestProperties::get, &TestProperties::set)
+        .def_property("def_property_impossible", nullptr, nullptr)
+        .def_readonly_static("def_readonly_static", &TestProperties::static_value)
+        .def_readwrite_static("def_readwrite_static", &TestProperties::static_value)
+        .def_property_static("def_writeonly_static", nullptr,
+                             [](py::object, int v) { TestProperties::static_value = v; })
+        .def_property_readonly_static("def_property_readonly_static",
+                                      [](py::object) { return TestProperties::static_get(); })
+        .def_property_static("def_property_writeonly_static", nullptr,
+                             [](py::object, int v) { return TestProperties::static_set(v); })
+        .def_property_static("def_property_static",
+                             [](py::object) { return TestProperties::static_get(); },
+                             [](py::object, int v) { TestProperties::static_set(v); })
+        .def_property_static("static_cls",
+                             [](py::object cls) { return cls; },
+                             [](py::object cls, py::function f) { f(cls); });
+
+    py::class_<TestPropertiesOverride, TestProperties>(m, "TestPropertiesOverride")
+        .def(py::init<>())
+        .def_readonly("def_readonly", &TestPropertiesOverride::value)
+        .def_readonly_static("def_readonly_static", &TestPropertiesOverride::static_value);
+
+    auto static_get1 = [](py::object) -> const UserType & { return TestPropRVP::sv1; };
+    auto static_get2 = [](py::object) -> const UserType & { return TestPropRVP::sv2; };
+    auto static_set1 = [](py::object, int v) { TestPropRVP::sv1.set(v); };
+    auto static_set2 = [](py::object, int v) { TestPropRVP::sv2.set(v); };
+    auto rvp_copy = py::return_value_policy::copy;
+
+    // test_property_return_value_policies
+    py::class_<TestPropRVP>(m, "TestPropRVP")
+        .def(py::init<>())
+        .def_property_readonly("ro_ref", &TestPropRVP::get1)
+        .def_property_readonly("ro_copy", &TestPropRVP::get2, rvp_copy)
+        .def_property_readonly("ro_func", py::cpp_function(&TestPropRVP::get2, rvp_copy))
+        .def_property("rw_ref", &TestPropRVP::get1, &TestPropRVP::set1)
+        .def_property("rw_copy", &TestPropRVP::get2, &TestPropRVP::set2, rvp_copy)
+        .def_property("rw_func", py::cpp_function(&TestPropRVP::get2, rvp_copy), &TestPropRVP::set2)
+        .def_property_readonly_static("static_ro_ref", static_get1)
+        .def_property_readonly_static("static_ro_copy", static_get2, rvp_copy)
+        .def_property_readonly_static("static_ro_func", py::cpp_function(static_get2, rvp_copy))
+        .def_property_static("static_rw_ref", static_get1, static_set1)
+        .def_property_static("static_rw_copy", static_get2, static_set2, rvp_copy)
+        .def_property_static("static_rw_func", py::cpp_function(static_get2, rvp_copy), static_set2)
+        // test_property_rvalue_policy
+        .def_property_readonly("rvalue", &TestPropRVP::get_rvalue)
+        .def_property_readonly_static("static_rvalue", [](py::object) { return UserType(1); });
+
+    // test_metaclass_override
+    struct MetaclassOverride { };
+    py::class_<MetaclassOverride>(m, "MetaclassOverride", py::metaclass((PyObject *) &PyType_Type))
+        .def_property_readonly_static("readonly", [](py::object) { return 1; });
+
+#if !defined(PYPY_VERSION)
+    // test_dynamic_attributes
+    class DynamicClass {
+    public:
+        DynamicClass() { print_default_created(this); }
+        ~DynamicClass() { print_destroyed(this); }
+    };
+    py::class_<DynamicClass>(m, "DynamicClass", py::dynamic_attr())
+        .def(py::init());
+
+    class CppDerivedDynamicClass : public DynamicClass { };
+    py::class_<CppDerivedDynamicClass, DynamicClass>(m, "CppDerivedDynamicClass")
+        .def(py::init());
+#endif
+
+    // test_noconvert_args
+    //
+    // Test converting.  The ArgAlwaysConverts is just there to make the first no-conversion pass
+    // fail so that our call always ends up happening via the second dispatch (the one that allows
+    // some conversion).
+    class ArgInspector {
+    public:
+        ArgInspector1 f(ArgInspector1 a, ArgAlwaysConverts) { return a; }
+        std::string g(ArgInspector1 a, const ArgInspector1 &b, int c, ArgInspector2 *d, ArgAlwaysConverts) {
+            return a.arg + "\n" + b.arg + "\n" + std::to_string(c) + "\n" + d->arg;
+        }
+        static ArgInspector2 h(ArgInspector2 a, ArgAlwaysConverts) { return a; }
+    };
+    py::class_<ArgInspector>(m, "ArgInspector")
+        .def(py::init<>())
+        .def("f", &ArgInspector::f, py::arg(), py::arg() = ArgAlwaysConverts())
+        .def("g", &ArgInspector::g, "a"_a.noconvert(), "b"_a, "c"_a.noconvert()=13, "d"_a=ArgInspector2(), py::arg() = ArgAlwaysConverts())
+        .def_static("h", &ArgInspector::h, py::arg().noconvert(), py::arg() = ArgAlwaysConverts())
+        ;
+    m.def("arg_inspect_func", [](ArgInspector2 a, ArgInspector1 b, ArgAlwaysConverts) { return a.arg + "\n" + b.arg; },
+            py::arg().noconvert(false), py::arg_v(nullptr, ArgInspector1()).noconvert(true), py::arg() = ArgAlwaysConverts());
+
+    m.def("floats_preferred", [](double f) { return 0.5 * f; }, py::arg("f"));
+    m.def("floats_only", [](double f) { return 0.5 * f; }, py::arg("f").noconvert());
+    m.def("ints_preferred", [](int i) { return i / 2; }, py::arg("i"));
+    m.def("ints_only", [](int i) { return i / 2; }, py::arg("i").noconvert());
+
+    // test_bad_arg_default
+    // Issue/PR #648: bad arg default debugging output
+#if !defined(NDEBUG)
+    m.attr("debug_enabled") = true;
+#else
+    m.attr("debug_enabled") = false;
+#endif
+    m.def("bad_arg_def_named", []{
+        auto m = py::module::import("pybind11_tests");
+        m.def("should_fail", [](int, UnregisteredType) {}, py::arg(), py::arg("a") = UnregisteredType());
+    });
+    m.def("bad_arg_def_unnamed", []{
+        auto m = py::module::import("pybind11_tests");
+        m.def("should_fail", [](int, UnregisteredType) {}, py::arg(), py::arg() = UnregisteredType());
+    });
+
+    // test_accepts_none
+    py::class_<NoneTester, std::shared_ptr<NoneTester>>(m, "NoneTester")
+        .def(py::init<>());
+    m.def("no_none1", &none1, py::arg().none(false));
+    m.def("no_none2", &none2, py::arg().none(false));
+    m.def("no_none3", &none3, py::arg().none(false));
+    m.def("no_none4", &none4, py::arg().none(false));
+    m.def("no_none5", &none5, py::arg().none(false));
+    m.def("ok_none1", &none1);
+    m.def("ok_none2", &none2, py::arg().none(true));
+    m.def("ok_none3", &none3);
+    m.def("ok_none4", &none4, py::arg().none(true));
+    m.def("ok_none5", &none5);
+
+    // test_str_issue
+    // Issue #283: __str__ called on uninitialized instance when constructor arguments invalid
+    py::class_<StrIssue>(m, "StrIssue")
+        .def(py::init<int>())
+        .def(py::init<>())
+        .def("__str__", [](const StrIssue &si) {
+            return "StrIssue[" + std::to_string(si.val) + "]"; }
+        );
+
+    // test_unregistered_base_implementations
+    //
+    // Issues #854/910: incompatible function args when member function/pointer is in unregistered
+    // base class The methods and member pointers below actually resolve to members/pointers in
+    // UnregisteredBase; before this test/fix they would be registered via lambda with a first
+    // argument of an unregistered type, and thus uncallable.
+    py::class_<RegisteredDerived>(m, "RegisteredDerived")
+        .def(py::init<>())
+        .def("do_nothing", &RegisteredDerived::do_nothing)
+        .def("increase_value", &RegisteredDerived::increase_value)
+        .def_readwrite("rw_value", &RegisteredDerived::rw_value)
+        .def_readonly("ro_value", &RegisteredDerived::ro_value)
+        // These should trigger a static_assert if uncommented
+        //.def_readwrite("fails", &UserType::value) // should trigger a static_assert if uncommented
+        //.def_readonly("fails", &UserType::value) // should trigger a static_assert if uncommented
+        .def_property("rw_value_prop", &RegisteredDerived::get_int, &RegisteredDerived::set_int)
+        .def_property_readonly("ro_value_prop", &RegisteredDerived::get_double)
+        // This one is in the registered class:
+        .def("sum", &RegisteredDerived::sum)
+        ;
+
+    using Adapted = decltype(py::method_adaptor<RegisteredDerived>(&RegisteredDerived::do_nothing));
+    static_assert(std::is_same<Adapted, void (RegisteredDerived::*)() const>::value, "");
+
+    // test_custom_caster_destruction
+    // Test that `take_ownership` works on types with a custom type caster when given a pointer
+
+    // default policy: don't take ownership:
+    m.def("custom_caster_no_destroy", []() { static auto *dt = new DestructionTester(); return dt; });
+
+    m.def("custom_caster_destroy", []() { return new DestructionTester(); },
+            py::return_value_policy::take_ownership); // Takes ownership: destroy when finished
+    m.def("custom_caster_destroy_const", []() -> const DestructionTester * { return new DestructionTester(); },
+            py::return_value_policy::take_ownership); // Likewise (const doesn't inhibit destruction)
+    m.def("destruction_tester_cstats", &ConstructorStats::get<DestructionTester>, py::return_value_policy::reference);
+}
diff --git a/3rdparty/pybind11/tests/test_methods_and_attributes.py b/3rdparty/pybind11/tests/test_methods_and_attributes.py
new file mode 100644
index 00000000..f1c862be
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_methods_and_attributes.py
@@ -0,0 +1,512 @@
+import pytest
+from pybind11_tests import methods_and_attributes as m
+from pybind11_tests import ConstructorStats
+
+
+def test_methods_and_attributes():
+    instance1 = m.ExampleMandA()
+    instance2 = m.ExampleMandA(32)
+
+    instance1.add1(instance2)
+    instance1.add2(instance2)
+    instance1.add3(instance2)
+    instance1.add4(instance2)
+    instance1.add5(instance2)
+    instance1.add6(32)
+    instance1.add7(32)
+    instance1.add8(32)
+    instance1.add9(32)
+    instance1.add10(32)
+
+    assert str(instance1) == "ExampleMandA[value=320]"
+    assert str(instance2) == "ExampleMandA[value=32]"
+    assert str(instance1.self1()) == "ExampleMandA[value=320]"
+    assert str(instance1.self2()) == "ExampleMandA[value=320]"
+    assert str(instance1.self3()) == "ExampleMandA[value=320]"
+    assert str(instance1.self4()) == "ExampleMandA[value=320]"
+    assert str(instance1.self5()) == "ExampleMandA[value=320]"
+
+    assert instance1.internal1() == 320
+    assert instance1.internal2() == 320
+    assert instance1.internal3() == 320
+    assert instance1.internal4() == 320
+    assert instance1.internal5() == 320
+
+    assert instance1.overloaded() == "()"
+    assert instance1.overloaded(0) == "(int)"
+    assert instance1.overloaded(1, 1.0) == "(int, float)"
+    assert instance1.overloaded(2.0, 2) == "(float, int)"
+    assert instance1.overloaded(3,   3) == "(int, int)"
+    assert instance1.overloaded(4., 4.) == "(float, float)"
+    assert instance1.overloaded_const(-3) == "(int) const"
+    assert instance1.overloaded_const(5, 5.0) == "(int, float) const"
+    assert instance1.overloaded_const(6.0, 6) == "(float, int) const"
+    assert instance1.overloaded_const(7,   7) == "(int, int) const"
+    assert instance1.overloaded_const(8., 8.) == "(float, float) const"
+    assert instance1.overloaded_float(1, 1) == "(float, float)"
+    assert instance1.overloaded_float(1, 1.) == "(float, float)"
+    assert instance1.overloaded_float(1., 1) == "(float, float)"
+    assert instance1.overloaded_float(1., 1.) == "(float, float)"
+
+    assert instance1.value == 320
+    instance1.value = 100
+    assert str(instance1) == "ExampleMandA[value=100]"
+
+    cstats = ConstructorStats.get(m.ExampleMandA)
+    assert cstats.alive() == 2
+    del instance1, instance2
+    assert cstats.alive() == 0
+    assert cstats.values() == ["32"]
+    assert cstats.default_constructions == 1
+    assert cstats.copy_constructions == 3
+    assert cstats.move_constructions >= 1
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+
+def test_copy_method():
+    """Issue #443: calling copied methods fails in Python 3"""
+
+    m.ExampleMandA.add2c = m.ExampleMandA.add2
+    m.ExampleMandA.add2d = m.ExampleMandA.add2b
+    a = m.ExampleMandA(123)
+    assert a.value == 123
+    a.add2(m.ExampleMandA(-100))
+    assert a.value == 23
+    a.add2b(m.ExampleMandA(20))
+    assert a.value == 43
+    a.add2c(m.ExampleMandA(6))
+    assert a.value == 49
+    a.add2d(m.ExampleMandA(-7))
+    assert a.value == 42
+
+
+def test_properties():
+    instance = m.TestProperties()
+
+    assert instance.def_readonly == 1
+    with pytest.raises(AttributeError):
+        instance.def_readonly = 2
+
+    instance.def_readwrite = 2
+    assert instance.def_readwrite == 2
+
+    assert instance.def_property_readonly == 2
+    with pytest.raises(AttributeError):
+        instance.def_property_readonly = 3
+
+    instance.def_property = 3
+    assert instance.def_property == 3
+
+    with pytest.raises(AttributeError) as excinfo:
+        dummy = instance.def_property_writeonly  # noqa: F841 unused var
+    assert "unreadable attribute" in str(excinfo.value)
+
+    instance.def_property_writeonly = 4
+    assert instance.def_property_readonly == 4
+
+    with pytest.raises(AttributeError) as excinfo:
+        dummy = instance.def_property_impossible  # noqa: F841 unused var
+    assert "unreadable attribute" in str(excinfo.value)
+
+    with pytest.raises(AttributeError) as excinfo:
+        instance.def_property_impossible = 5
+    assert "can't set attribute" in str(excinfo.value)
+
+
+def test_static_properties():
+    assert m.TestProperties.def_readonly_static == 1
+    with pytest.raises(AttributeError) as excinfo:
+        m.TestProperties.def_readonly_static = 2
+    assert "can't set attribute" in str(excinfo.value)
+
+    m.TestProperties.def_readwrite_static = 2
+    assert m.TestProperties.def_readwrite_static == 2
+
+    with pytest.raises(AttributeError) as excinfo:
+        dummy = m.TestProperties.def_writeonly_static  # noqa: F841 unused var
+    assert "unreadable attribute" in str(excinfo.value)
+
+    m.TestProperties.def_writeonly_static = 3
+    assert m.TestProperties.def_readonly_static == 3
+
+    assert m.TestProperties.def_property_readonly_static == 3
+    with pytest.raises(AttributeError) as excinfo:
+        m.TestProperties.def_property_readonly_static = 99
+    assert "can't set attribute" in str(excinfo.value)
+
+    m.TestProperties.def_property_static = 4
+    assert m.TestProperties.def_property_static == 4
+
+    with pytest.raises(AttributeError) as excinfo:
+        dummy = m.TestProperties.def_property_writeonly_static
+    assert "unreadable attribute" in str(excinfo.value)
+
+    m.TestProperties.def_property_writeonly_static = 5
+    assert m.TestProperties.def_property_static == 5
+
+    # Static property read and write via instance
+    instance = m.TestProperties()
+
+    m.TestProperties.def_readwrite_static = 0
+    assert m.TestProperties.def_readwrite_static == 0
+    assert instance.def_readwrite_static == 0
+
+    instance.def_readwrite_static = 2
+    assert m.TestProperties.def_readwrite_static == 2
+    assert instance.def_readwrite_static == 2
+
+    with pytest.raises(AttributeError) as excinfo:
+        dummy = instance.def_property_writeonly_static  # noqa: F841 unused var
+    assert "unreadable attribute" in str(excinfo.value)
+
+    instance.def_property_writeonly_static = 4
+    assert instance.def_property_static == 4
+
+    # It should be possible to override properties in derived classes
+    assert m.TestPropertiesOverride().def_readonly == 99
+    assert m.TestPropertiesOverride.def_readonly_static == 99
+
+
+def test_static_cls():
+    """Static property getter and setters expect the type object as the their only argument"""
+
+    instance = m.TestProperties()
+    assert m.TestProperties.static_cls is m.TestProperties
+    assert instance.static_cls is m.TestProperties
+
+    def check_self(self):
+        assert self is m.TestProperties
+
+    m.TestProperties.static_cls = check_self
+    instance.static_cls = check_self
+
+
+def test_metaclass_override():
+    """Overriding pybind11's default metaclass changes the behavior of `static_property`"""
+
+    assert type(m.ExampleMandA).__name__ == "pybind11_type"
+    assert type(m.MetaclassOverride).__name__ == "type"
+
+    assert m.MetaclassOverride.readonly == 1
+    assert type(m.MetaclassOverride.__dict__["readonly"]).__name__ == "pybind11_static_property"
+
+    # Regular `type` replaces the property instead of calling `__set__()`
+    m.MetaclassOverride.readonly = 2
+    assert m.MetaclassOverride.readonly == 2
+    assert isinstance(m.MetaclassOverride.__dict__["readonly"], int)
+
+
+def test_no_mixed_overloads():
+    from pybind11_tests import debug_enabled
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.ExampleMandA.add_mixed_overloads1()
+    assert (str(excinfo.value) ==
+            "overloading a method with both static and instance methods is not supported; " +
+            ("compile in debug mode for more details" if not debug_enabled else
+             "error while attempting to bind static method ExampleMandA.overload_mixed1"
+             "(arg0: float) -> str")
+            )
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.ExampleMandA.add_mixed_overloads2()
+    assert (str(excinfo.value) ==
+            "overloading a method with both static and instance methods is not supported; " +
+            ("compile in debug mode for more details" if not debug_enabled else
+             "error while attempting to bind instance method ExampleMandA.overload_mixed2"
+             "(self: pybind11_tests.methods_and_attributes.ExampleMandA, arg0: int, arg1: int)"
+             " -> str")
+            )
+
+
+@pytest.mark.parametrize("access", ["ro", "rw", "static_ro", "static_rw"])
+def test_property_return_value_policies(access):
+    if not access.startswith("static"):
+        obj = m.TestPropRVP()
+    else:
+        obj = m.TestPropRVP
+
+    ref = getattr(obj, access + "_ref")
+    assert ref.value == 1
+    ref.value = 2
+    assert getattr(obj, access + "_ref").value == 2
+    ref.value = 1  # restore original value for static properties
+
+    copy = getattr(obj, access + "_copy")
+    assert copy.value == 1
+    copy.value = 2
+    assert getattr(obj, access + "_copy").value == 1
+
+    copy = getattr(obj, access + "_func")
+    assert copy.value == 1
+    copy.value = 2
+    assert getattr(obj, access + "_func").value == 1
+
+
+def test_property_rvalue_policy():
+    """When returning an rvalue, the return value policy is automatically changed from
+    `reference(_internal)` to `move`. The following would not work otherwise."""
+
+    instance = m.TestPropRVP()
+    o = instance.rvalue
+    assert o.value == 1
+
+    os = m.TestPropRVP.static_rvalue
+    assert os.value == 1
+
+
+# https://bitbucket.org/pypy/pypy/issues/2447
+@pytest.unsupported_on_pypy
+def test_dynamic_attributes():
+    instance = m.DynamicClass()
+    assert not hasattr(instance, "foo")
+    assert "foo" not in dir(instance)
+
+    # Dynamically add attribute
+    instance.foo = 42
+    assert hasattr(instance, "foo")
+    assert instance.foo == 42
+    assert "foo" in dir(instance)
+
+    # __dict__ should be accessible and replaceable
+    assert "foo" in instance.__dict__
+    instance.__dict__ = {"bar": True}
+    assert not hasattr(instance, "foo")
+    assert hasattr(instance, "bar")
+
+    with pytest.raises(TypeError) as excinfo:
+        instance.__dict__ = []
+    assert str(excinfo.value) == "__dict__ must be set to a dictionary, not a 'list'"
+
+    cstats = ConstructorStats.get(m.DynamicClass)
+    assert cstats.alive() == 1
+    del instance
+    assert cstats.alive() == 0
+
+    # Derived classes should work as well
+    class PythonDerivedDynamicClass(m.DynamicClass):
+        pass
+
+    for cls in m.CppDerivedDynamicClass, PythonDerivedDynamicClass:
+        derived = cls()
+        derived.foobar = 100
+        assert derived.foobar == 100
+
+        assert cstats.alive() == 1
+        del derived
+        assert cstats.alive() == 0
+
+
+# https://bitbucket.org/pypy/pypy/issues/2447
+@pytest.unsupported_on_pypy
+def test_cyclic_gc():
+    # One object references itself
+    instance = m.DynamicClass()
+    instance.circular_reference = instance
+
+    cstats = ConstructorStats.get(m.DynamicClass)
+    assert cstats.alive() == 1
+    del instance
+    assert cstats.alive() == 0
+
+    # Two object reference each other
+    i1 = m.DynamicClass()
+    i2 = m.DynamicClass()
+    i1.cycle = i2
+    i2.cycle = i1
+
+    assert cstats.alive() == 2
+    del i1, i2
+    assert cstats.alive() == 0
+
+
+def test_noconvert_args(msg):
+    a = m.ArgInspector()
+    assert msg(a.f("hi")) == """
+        loading ArgInspector1 argument WITH conversion allowed.  Argument value = hi
+    """
+    assert msg(a.g("this is a", "this is b")) == """
+        loading ArgInspector1 argument WITHOUT conversion allowed.  Argument value = this is a
+        loading ArgInspector1 argument WITH conversion allowed.  Argument value = this is b
+        13
+        loading ArgInspector2 argument WITH conversion allowed.  Argument value = (default arg inspector 2)
+    """  # noqa: E501 line too long
+    assert msg(a.g("this is a", "this is b", 42)) == """
+        loading ArgInspector1 argument WITHOUT conversion allowed.  Argument value = this is a
+        loading ArgInspector1 argument WITH conversion allowed.  Argument value = this is b
+        42
+        loading ArgInspector2 argument WITH conversion allowed.  Argument value = (default arg inspector 2)
+    """  # noqa: E501 line too long
+    assert msg(a.g("this is a", "this is b", 42, "this is d")) == """
+        loading ArgInspector1 argument WITHOUT conversion allowed.  Argument value = this is a
+        loading ArgInspector1 argument WITH conversion allowed.  Argument value = this is b
+        42
+        loading ArgInspector2 argument WITH conversion allowed.  Argument value = this is d
+    """
+    assert (a.h("arg 1") ==
+            "loading ArgInspector2 argument WITHOUT conversion allowed.  Argument value = arg 1")
+    assert msg(m.arg_inspect_func("A1", "A2")) == """
+        loading ArgInspector2 argument WITH conversion allowed.  Argument value = A1
+        loading ArgInspector1 argument WITHOUT conversion allowed.  Argument value = A2
+    """
+
+    assert m.floats_preferred(4) == 2.0
+    assert m.floats_only(4.0) == 2.0
+    with pytest.raises(TypeError) as excinfo:
+        m.floats_only(4)
+    assert msg(excinfo.value) == """
+        floats_only(): incompatible function arguments. The following argument types are supported:
+            1. (f: float) -> float
+
+        Invoked with: 4
+    """
+
+    assert m.ints_preferred(4) == 2
+    assert m.ints_preferred(True) == 0
+    with pytest.raises(TypeError) as excinfo:
+        m.ints_preferred(4.0)
+    assert msg(excinfo.value) == """
+        ints_preferred(): incompatible function arguments. The following argument types are supported:
+            1. (i: int) -> int
+
+        Invoked with: 4.0
+    """  # noqa: E501 line too long
+
+    assert m.ints_only(4) == 2
+    with pytest.raises(TypeError) as excinfo:
+        m.ints_only(4.0)
+    assert msg(excinfo.value) == """
+        ints_only(): incompatible function arguments. The following argument types are supported:
+            1. (i: int) -> int
+
+        Invoked with: 4.0
+    """
+
+
+def test_bad_arg_default(msg):
+    from pybind11_tests import debug_enabled
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.bad_arg_def_named()
+    assert msg(excinfo.value) == (
+        "arg(): could not convert default argument 'a: UnregisteredType' in function "
+        "'should_fail' into a Python object (type not registered yet?)"
+        if debug_enabled else
+        "arg(): could not convert default argument into a Python object (type not registered "
+        "yet?). Compile in debug mode for more information."
+    )
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.bad_arg_def_unnamed()
+    assert msg(excinfo.value) == (
+        "arg(): could not convert default argument 'UnregisteredType' in function "
+        "'should_fail' into a Python object (type not registered yet?)"
+        if debug_enabled else
+        "arg(): could not convert default argument into a Python object (type not registered "
+        "yet?). Compile in debug mode for more information."
+    )
+
+
+def test_accepts_none(msg):
+    a = m.NoneTester()
+    assert m.no_none1(a) == 42
+    assert m.no_none2(a) == 42
+    assert m.no_none3(a) == 42
+    assert m.no_none4(a) == 42
+    assert m.no_none5(a) == 42
+    assert m.ok_none1(a) == 42
+    assert m.ok_none2(a) == 42
+    assert m.ok_none3(a) == 42
+    assert m.ok_none4(a) == 42
+    assert m.ok_none5(a) == 42
+
+    with pytest.raises(TypeError) as excinfo:
+        m.no_none1(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.no_none2(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.no_none3(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.no_none4(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+    with pytest.raises(TypeError) as excinfo:
+        m.no_none5(None)
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    # The first one still raises because you can't pass None as a lvalue reference arg:
+    with pytest.raises(TypeError) as excinfo:
+        assert m.ok_none1(None) == -1
+    assert msg(excinfo.value) == """
+        ok_none1(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: m.methods_and_attributes.NoneTester) -> int
+
+        Invoked with: None
+    """
+
+    # The rest take the argument as pointer or holder, and accept None:
+    assert m.ok_none2(None) == -1
+    assert m.ok_none3(None) == -1
+    assert m.ok_none4(None) == -1
+    assert m.ok_none5(None) == -1
+
+
+def test_str_issue(msg):
+    """#283: __str__ called on uninitialized instance when constructor arguments invalid"""
+
+    assert str(m.StrIssue(3)) == "StrIssue[3]"
+
+    with pytest.raises(TypeError) as excinfo:
+        str(m.StrIssue("no", "such", "constructor"))
+    assert msg(excinfo.value) == """
+        __init__(): incompatible constructor arguments. The following argument types are supported:
+            1. m.methods_and_attributes.StrIssue(arg0: int)
+            2. m.methods_and_attributes.StrIssue()
+
+        Invoked with: 'no', 'such', 'constructor'
+    """
+
+
+def test_unregistered_base_implementations():
+    a = m.RegisteredDerived()
+    a.do_nothing()
+    assert a.rw_value == 42
+    assert a.ro_value == 1.25
+    a.rw_value += 5
+    assert a.sum() == 48.25
+    a.increase_value()
+    assert a.rw_value == 48
+    assert a.ro_value == 1.5
+    assert a.sum() == 49.5
+    assert a.rw_value_prop == 48
+    a.rw_value_prop += 1
+    assert a.rw_value_prop == 49
+    a.increase_value()
+    assert a.ro_value_prop == 1.75
+
+
+def test_custom_caster_destruction():
+    """Tests that returning a pointer to a type that gets converted with a custom type caster gets
+    destroyed when the function has py::return_value_policy::take_ownership policy applied."""
+
+    cstats = m.destruction_tester_cstats()
+    # This one *doesn't* have take_ownership: the pointer should be used but not destroyed:
+    z = m.custom_caster_no_destroy()
+    assert cstats.alive() == 1 and cstats.default_constructions == 1
+    assert z
+
+    # take_ownership applied: this constructs a new object, casts it, then destroys it:
+    z = m.custom_caster_destroy()
+    assert z
+    assert cstats.default_constructions == 2
+
+    # Same, but with a const pointer return (which should *not* inhibit destruction):
+    z = m.custom_caster_destroy_const()
+    assert z
+    assert cstats.default_constructions == 3
+
+    # Make sure we still only have the original object (from ..._no_destroy()) alive:
+    assert cstats.alive() == 1
diff --git a/3rdparty/pybind11/tests/test_modules.cpp b/3rdparty/pybind11/tests/test_modules.cpp
new file mode 100644
index 00000000..c1475fa6
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_modules.cpp
@@ -0,0 +1,98 @@
+/*
+    tests/test_modules.cpp -- nested modules, importing modules, and
+                            internal references
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+
+TEST_SUBMODULE(modules, m) {
+    // test_nested_modules
+    py::module m_sub = m.def_submodule("subsubmodule");
+    m_sub.def("submodule_func", []() { return "submodule_func()"; });
+
+    // test_reference_internal
+    class A {
+    public:
+        A(int v) : v(v) { print_created(this, v); }
+        ~A() { print_destroyed(this); }
+        A(const A&) { print_copy_created(this); }
+        A& operator=(const A &copy) { print_copy_assigned(this); v = copy.v; return *this; }
+        std::string toString() { return "A[" + std::to_string(v) + "]"; }
+    private:
+        int v;
+    };
+    py::class_<A>(m_sub, "A")
+        .def(py::init<int>())
+        .def("__repr__", &A::toString);
+
+    class B {
+    public:
+        B() { print_default_created(this); }
+        ~B() { print_destroyed(this); }
+        B(const B&) { print_copy_created(this); }
+        B& operator=(const B &copy) { print_copy_assigned(this); a1 = copy.a1; a2 = copy.a2; return *this; }
+        A &get_a1() { return a1; }
+        A &get_a2() { return a2; }
+
+        A a1{1};
+        A a2{2};
+    };
+    py::class_<B>(m_sub, "B")
+        .def(py::init<>())
+        .def("get_a1", &B::get_a1, "Return the internal A 1", py::return_value_policy::reference_internal)
+        .def("get_a2", &B::get_a2, "Return the internal A 2", py::return_value_policy::reference_internal)
+        .def_readwrite("a1", &B::a1)  // def_readonly uses an internal reference return policy by default
+        .def_readwrite("a2", &B::a2);
+
+    m.attr("OD") = py::module::import("collections").attr("OrderedDict");
+
+    // test_duplicate_registration
+    // Registering two things with the same name
+    m.def("duplicate_registration", []() {
+        class Dupe1 { };
+        class Dupe2 { };
+        class Dupe3 { };
+        class DupeException { };
+
+        auto dm = py::module("dummy");
+        auto failures = py::list();
+
+        py::class_<Dupe1>(dm, "Dupe1");
+        py::class_<Dupe2>(dm, "Dupe2");
+        dm.def("dupe1_factory", []() { return Dupe1(); });
+        py::exception<DupeException>(dm, "DupeException");
+
+        try {
+            py::class_<Dupe1>(dm, "Dupe1");
+            failures.append("Dupe1 class");
+        } catch (std::runtime_error &) {}
+        try {
+            dm.def("Dupe1", []() { return Dupe1(); });
+            failures.append("Dupe1 function");
+        } catch (std::runtime_error &) {}
+        try {
+            py::class_<Dupe3>(dm, "dupe1_factory");
+            failures.append("dupe1_factory");
+        } catch (std::runtime_error &) {}
+        try {
+            py::exception<Dupe3>(dm, "Dupe2");
+            failures.append("Dupe2");
+        } catch (std::runtime_error &) {}
+        try {
+            dm.def("DupeException", []() { return 30; });
+            failures.append("DupeException1");
+        } catch (std::runtime_error &) {}
+        try {
+            py::class_<DupeException>(dm, "DupeException");
+            failures.append("DupeException2");
+        } catch (std::runtime_error &) {}
+
+        return failures;
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_modules.py b/3rdparty/pybind11/tests/test_modules.py
new file mode 100644
index 00000000..2552838c
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_modules.py
@@ -0,0 +1,72 @@
+from pybind11_tests import modules as m
+from pybind11_tests.modules import subsubmodule as ms
+from pybind11_tests import ConstructorStats
+
+
+def test_nested_modules():
+    import pybind11_tests
+    assert pybind11_tests.__name__ == "pybind11_tests"
+    assert pybind11_tests.modules.__name__ == "pybind11_tests.modules"
+    assert pybind11_tests.modules.subsubmodule.__name__ == "pybind11_tests.modules.subsubmodule"
+    assert m.__name__ == "pybind11_tests.modules"
+    assert ms.__name__ == "pybind11_tests.modules.subsubmodule"
+
+    assert ms.submodule_func() == "submodule_func()"
+
+
+def test_reference_internal():
+    b = ms.B()
+    assert str(b.get_a1()) == "A[1]"
+    assert str(b.a1) == "A[1]"
+    assert str(b.get_a2()) == "A[2]"
+    assert str(b.a2) == "A[2]"
+
+    b.a1 = ms.A(42)
+    b.a2 = ms.A(43)
+    assert str(b.get_a1()) == "A[42]"
+    assert str(b.a1) == "A[42]"
+    assert str(b.get_a2()) == "A[43]"
+    assert str(b.a2) == "A[43]"
+
+    astats, bstats = ConstructorStats.get(ms.A), ConstructorStats.get(ms.B)
+    assert astats.alive() == 2
+    assert bstats.alive() == 1
+    del b
+    assert astats.alive() == 0
+    assert bstats.alive() == 0
+    assert astats.values() == ['1', '2', '42', '43']
+    assert bstats.values() == []
+    assert astats.default_constructions == 0
+    assert bstats.default_constructions == 1
+    assert astats.copy_constructions == 0
+    assert bstats.copy_constructions == 0
+    # assert astats.move_constructions >= 0  # Don't invoke any
+    # assert bstats.move_constructions >= 0  # Don't invoke any
+    assert astats.copy_assignments == 2
+    assert bstats.copy_assignments == 0
+    assert astats.move_assignments == 0
+    assert bstats.move_assignments == 0
+
+
+def test_importing():
+    from pybind11_tests.modules import OD
+    from collections import OrderedDict
+
+    assert OD is OrderedDict
+    assert str(OD([(1, 'a'), (2, 'b')])) == "OrderedDict([(1, 'a'), (2, 'b')])"
+
+
+def test_pydoc():
+    """Pydoc needs to be able to provide help() for everything inside a pybind11 module"""
+    import pybind11_tests
+    import pydoc
+
+    assert pybind11_tests.__name__ == "pybind11_tests"
+    assert pybind11_tests.__doc__ == "pybind11 test module"
+    assert pydoc.text.docmodule(pybind11_tests)
+
+
+def test_duplicate_registration():
+    """Registering two things with the same name"""
+
+    assert m.duplicate_registration() == []
diff --git a/3rdparty/pybind11/tests/test_multiple_inheritance.cpp b/3rdparty/pybind11/tests/test_multiple_inheritance.cpp
new file mode 100644
index 00000000..ba1674fb
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_multiple_inheritance.cpp
@@ -0,0 +1,220 @@
+/*
+    tests/test_multiple_inheritance.cpp -- multiple inheritance,
+    implicit MI casts
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+
+// Many bases for testing that multiple inheritance from many classes (i.e. requiring extra
+// space for holder constructed flags) works.
+template <int N> struct BaseN {
+    BaseN(int i) : i(i) { }
+    int i;
+};
+
+// test_mi_static_properties
+struct Vanilla {
+    std::string vanilla() { return "Vanilla"; };
+};
+struct WithStatic1 {
+    static std::string static_func1() { return "WithStatic1"; };
+    static int static_value1;
+};
+struct WithStatic2 {
+    static std::string static_func2() { return "WithStatic2"; };
+    static int static_value2;
+};
+struct VanillaStaticMix1 : Vanilla, WithStatic1, WithStatic2 {
+    static std::string static_func() { return "VanillaStaticMix1"; }
+    static int static_value;
+};
+struct VanillaStaticMix2 : WithStatic1, Vanilla, WithStatic2 {
+    static std::string static_func() { return "VanillaStaticMix2"; }
+    static int static_value;
+};
+int WithStatic1::static_value1 = 1;
+int WithStatic2::static_value2 = 2;
+int VanillaStaticMix1::static_value = 12;
+int VanillaStaticMix2::static_value = 12;
+
+TEST_SUBMODULE(multiple_inheritance, m) {
+
+    // test_multiple_inheritance_mix1
+    // test_multiple_inheritance_mix2
+    struct Base1 {
+        Base1(int i) : i(i) { }
+        int foo() { return i; }
+        int i;
+    };
+    py::class_<Base1> b1(m, "Base1");
+    b1.def(py::init<int>())
+      .def("foo", &Base1::foo);
+
+    struct Base2 {
+        Base2(int i) : i(i) { }
+        int bar() { return i; }
+        int i;
+    };
+    py::class_<Base2> b2(m, "Base2");
+    b2.def(py::init<int>())
+      .def("bar", &Base2::bar);
+
+
+    // test_multiple_inheritance_cpp
+    struct Base12 : Base1, Base2 {
+        Base12(int i, int j) : Base1(i), Base2(j) { }
+    };
+    struct MIType : Base12 {
+        MIType(int i, int j) : Base12(i, j) { }
+    };
+    py::class_<Base12, Base1, Base2>(m, "Base12");
+    py::class_<MIType, Base12>(m, "MIType")
+        .def(py::init<int, int>());
+
+
+    // test_multiple_inheritance_python_many_bases
+    #define PYBIND11_BASEN(N) py::class_<BaseN<N>>(m, "BaseN" #N).def(py::init<int>()).def("f" #N, [](BaseN<N> &b) { return b.i + N; })
+    PYBIND11_BASEN( 1); PYBIND11_BASEN( 2); PYBIND11_BASEN( 3); PYBIND11_BASEN( 4);
+    PYBIND11_BASEN( 5); PYBIND11_BASEN( 6); PYBIND11_BASEN( 7); PYBIND11_BASEN( 8);
+    PYBIND11_BASEN( 9); PYBIND11_BASEN(10); PYBIND11_BASEN(11); PYBIND11_BASEN(12);
+    PYBIND11_BASEN(13); PYBIND11_BASEN(14); PYBIND11_BASEN(15); PYBIND11_BASEN(16);
+    PYBIND11_BASEN(17);
+
+    // Uncommenting this should result in a compile time failure (MI can only be specified via
+    // template parameters because pybind has to know the types involved; see discussion in #742 for
+    // details).
+//    struct Base12v2 : Base1, Base2 {
+//        Base12v2(int i, int j) : Base1(i), Base2(j) { }
+//    };
+//    py::class_<Base12v2>(m, "Base12v2", b1, b2)
+//        .def(py::init<int, int>());
+
+
+    // test_multiple_inheritance_virtbase
+    // Test the case where not all base classes are specified, and where pybind11 requires the
+    // py::multiple_inheritance flag to perform proper casting between types.
+    struct Base1a {
+        Base1a(int i) : i(i) { }
+        int foo() { return i; }
+        int i;
+    };
+    py::class_<Base1a, std::shared_ptr<Base1a>>(m, "Base1a")
+        .def(py::init<int>())
+        .def("foo", &Base1a::foo);
+
+    struct Base2a {
+        Base2a(int i) : i(i) { }
+        int bar() { return i; }
+        int i;
+    };
+    py::class_<Base2a, std::shared_ptr<Base2a>>(m, "Base2a")
+        .def(py::init<int>())
+        .def("bar", &Base2a::bar);
+
+    struct Base12a : Base1a, Base2a {
+        Base12a(int i, int j) : Base1a(i), Base2a(j) { }
+    };
+    py::class_<Base12a, /* Base1 missing */ Base2a,
+               std::shared_ptr<Base12a>>(m, "Base12a", py::multiple_inheritance())
+        .def(py::init<int, int>());
+
+    m.def("bar_base2a", [](Base2a *b) { return b->bar(); });
+    m.def("bar_base2a_sharedptr", [](std::shared_ptr<Base2a> b) { return b->bar(); });
+
+    // test_mi_unaligned_base
+    // test_mi_base_return
+    // Issue #801: invalid casting to derived type with MI bases
+    struct I801B1 { int a = 1; I801B1() = default; I801B1(const I801B1 &) = default; virtual ~I801B1() = default; };
+    struct I801B2 { int b = 2; I801B2() = default; I801B2(const I801B2 &) = default; virtual ~I801B2() = default; };
+    struct I801C : I801B1, I801B2 {};
+    struct I801D : I801C {}; // Indirect MI
+    // Unregistered classes:
+    struct I801B3 { int c = 3; virtual ~I801B3() = default; };
+    struct I801E : I801B3, I801D {};
+
+    py::class_<I801B1, std::shared_ptr<I801B1>>(m, "I801B1").def(py::init<>()).def_readonly("a", &I801B1::a);
+    py::class_<I801B2, std::shared_ptr<I801B2>>(m, "I801B2").def(py::init<>()).def_readonly("b", &I801B2::b);
+    py::class_<I801C, I801B1, I801B2, std::shared_ptr<I801C>>(m, "I801C").def(py::init<>());
+    py::class_<I801D, I801C, std::shared_ptr<I801D>>(m, "I801D").def(py::init<>());
+
+    // Two separate issues here: first, we want to recognize a pointer to a base type as being a
+    // known instance even when the pointer value is unequal (i.e. due to a non-first
+    // multiple-inheritance base class):
+    m.def("i801b1_c", [](I801C *c) { return static_cast<I801B1 *>(c); });
+    m.def("i801b2_c", [](I801C *c) { return static_cast<I801B2 *>(c); });
+    m.def("i801b1_d", [](I801D *d) { return static_cast<I801B1 *>(d); });
+    m.def("i801b2_d", [](I801D *d) { return static_cast<I801B2 *>(d); });
+
+    // Second, when returned a base class pointer to a derived instance, we cannot assume that the
+    // pointer is `reinterpret_cast`able to the derived pointer because, like above, the base class
+    // pointer could be offset.
+    m.def("i801c_b1", []() -> I801B1 * { return new I801C(); });
+    m.def("i801c_b2", []() -> I801B2 * { return new I801C(); });
+    m.def("i801d_b1", []() -> I801B1 * { return new I801D(); });
+    m.def("i801d_b2", []() -> I801B2 * { return new I801D(); });
+
+    // Return a base class pointer to a pybind-registered type when the actual derived type
+    // isn't pybind-registered (and uses multiple-inheritance to offset the pybind base)
+    m.def("i801e_c", []() -> I801C * { return new I801E(); });
+    m.def("i801e_b2", []() -> I801B2 * { return new I801E(); });
+
+
+    // test_mi_static_properties
+    py::class_<Vanilla>(m, "Vanilla")
+        .def(py::init<>())
+        .def("vanilla", &Vanilla::vanilla);
+
+    py::class_<WithStatic1>(m, "WithStatic1")
+        .def(py::init<>())
+        .def_static("static_func1", &WithStatic1::static_func1)
+        .def_readwrite_static("static_value1", &WithStatic1::static_value1);
+
+    py::class_<WithStatic2>(m, "WithStatic2")
+        .def(py::init<>())
+        .def_static("static_func2", &WithStatic2::static_func2)
+        .def_readwrite_static("static_value2", &WithStatic2::static_value2);
+
+    py::class_<VanillaStaticMix1, Vanilla, WithStatic1, WithStatic2>(
+        m, "VanillaStaticMix1")
+        .def(py::init<>())
+        .def_static("static_func", &VanillaStaticMix1::static_func)
+        .def_readwrite_static("static_value", &VanillaStaticMix1::static_value);
+
+    py::class_<VanillaStaticMix2, WithStatic1, Vanilla, WithStatic2>(
+        m, "VanillaStaticMix2")
+        .def(py::init<>())
+        .def_static("static_func", &VanillaStaticMix2::static_func)
+        .def_readwrite_static("static_value", &VanillaStaticMix2::static_value);
+
+
+#if !defined(PYPY_VERSION)
+    struct WithDict { };
+    struct VanillaDictMix1 : Vanilla, WithDict { };
+    struct VanillaDictMix2 : WithDict, Vanilla { };
+    py::class_<WithDict>(m, "WithDict", py::dynamic_attr()).def(py::init<>());
+    py::class_<VanillaDictMix1, Vanilla, WithDict>(m, "VanillaDictMix1").def(py::init<>());
+    py::class_<VanillaDictMix2, WithDict, Vanilla>(m, "VanillaDictMix2").def(py::init<>());
+#endif
+
+    // test_diamond_inheritance
+    // Issue #959: segfault when constructing diamond inheritance instance
+    // All of these have int members so that there will be various unequal pointers involved.
+    struct B { int b; B() = default; B(const B&) = default; virtual ~B() = default; };
+    struct C0 : public virtual B { int c0; };
+    struct C1 : public virtual B { int c1; };
+    struct D : public C0, public C1 { int d; };
+    py::class_<B>(m, "B")
+        .def("b", [](B *self) { return self; });
+    py::class_<C0, B>(m, "C0")
+        .def("c0", [](C0 *self) { return self; });
+    py::class_<C1, B>(m, "C1")
+        .def("c1", [](C1 *self) { return self; });
+    py::class_<D, C0, C1>(m, "D")
+        .def(py::init<>());
+}
diff --git a/3rdparty/pybind11/tests/test_multiple_inheritance.py b/3rdparty/pybind11/tests/test_multiple_inheritance.py
new file mode 100644
index 00000000..475dd3b3
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_multiple_inheritance.py
@@ -0,0 +1,349 @@
+import pytest
+from pybind11_tests import ConstructorStats
+from pybind11_tests import multiple_inheritance as m
+
+
+def test_multiple_inheritance_cpp():
+    mt = m.MIType(3, 4)
+
+    assert mt.foo() == 3
+    assert mt.bar() == 4
+
+
+def test_multiple_inheritance_mix1():
+    class Base1:
+        def __init__(self, i):
+            self.i = i
+
+        def foo(self):
+            return self.i
+
+    class MITypePy(Base1, m.Base2):
+        def __init__(self, i, j):
+            Base1.__init__(self, i)
+            m.Base2.__init__(self, j)
+
+    mt = MITypePy(3, 4)
+
+    assert mt.foo() == 3
+    assert mt.bar() == 4
+
+
+def test_multiple_inheritance_mix2():
+
+    class Base2:
+        def __init__(self, i):
+            self.i = i
+
+        def bar(self):
+            return self.i
+
+    class MITypePy(m.Base1, Base2):
+        def __init__(self, i, j):
+            m.Base1.__init__(self, i)
+            Base2.__init__(self, j)
+
+    mt = MITypePy(3, 4)
+
+    assert mt.foo() == 3
+    assert mt.bar() == 4
+
+
+def test_multiple_inheritance_python():
+
+    class MI1(m.Base1, m.Base2):
+        def __init__(self, i, j):
+            m.Base1.__init__(self, i)
+            m.Base2.__init__(self, j)
+
+    class B1(object):
+        def v(self):
+            return 1
+
+    class MI2(B1, m.Base1, m.Base2):
+        def __init__(self, i, j):
+            B1.__init__(self)
+            m.Base1.__init__(self, i)
+            m.Base2.__init__(self, j)
+
+    class MI3(MI2):
+        def __init__(self, i, j):
+            MI2.__init__(self, i, j)
+
+    class MI4(MI3, m.Base2):
+        def __init__(self, i, j):
+            MI3.__init__(self, i, j)
+            # This should be ignored (Base2 is already initialized via MI2):
+            m.Base2.__init__(self, i + 100)
+
+    class MI5(m.Base2, B1, m.Base1):
+        def __init__(self, i, j):
+            B1.__init__(self)
+            m.Base1.__init__(self, i)
+            m.Base2.__init__(self, j)
+
+    class MI6(m.Base2, B1):
+        def __init__(self, i):
+            m.Base2.__init__(self, i)
+            B1.__init__(self)
+
+    class B2(B1):
+        def v(self):
+            return 2
+
+    class B3(object):
+        def v(self):
+            return 3
+
+    class B4(B3, B2):
+        def v(self):
+            return 4
+
+    class MI7(B4, MI6):
+        def __init__(self, i):
+            B4.__init__(self)
+            MI6.__init__(self, i)
+
+    class MI8(MI6, B3):
+        def __init__(self, i):
+            MI6.__init__(self, i)
+            B3.__init__(self)
+
+    class MI8b(B3, MI6):
+        def __init__(self, i):
+            B3.__init__(self)
+            MI6.__init__(self, i)
+
+    mi1 = MI1(1, 2)
+    assert mi1.foo() == 1
+    assert mi1.bar() == 2
+
+    mi2 = MI2(3, 4)
+    assert mi2.v() == 1
+    assert mi2.foo() == 3
+    assert mi2.bar() == 4
+
+    mi3 = MI3(5, 6)
+    assert mi3.v() == 1
+    assert mi3.foo() == 5
+    assert mi3.bar() == 6
+
+    mi4 = MI4(7, 8)
+    assert mi4.v() == 1
+    assert mi4.foo() == 7
+    assert mi4.bar() == 8
+
+    mi5 = MI5(10, 11)
+    assert mi5.v() == 1
+    assert mi5.foo() == 10
+    assert mi5.bar() == 11
+
+    mi6 = MI6(12)
+    assert mi6.v() == 1
+    assert mi6.bar() == 12
+
+    mi7 = MI7(13)
+    assert mi7.v() == 4
+    assert mi7.bar() == 13
+
+    mi8 = MI8(14)
+    assert mi8.v() == 1
+    assert mi8.bar() == 14
+
+    mi8b = MI8b(15)
+    assert mi8b.v() == 3
+    assert mi8b.bar() == 15
+
+
+def test_multiple_inheritance_python_many_bases():
+
+    class MIMany14(m.BaseN1, m.BaseN2, m.BaseN3, m.BaseN4):
+        def __init__(self):
+            m.BaseN1.__init__(self, 1)
+            m.BaseN2.__init__(self, 2)
+            m.BaseN3.__init__(self, 3)
+            m.BaseN4.__init__(self, 4)
+
+    class MIMany58(m.BaseN5, m.BaseN6, m.BaseN7, m.BaseN8):
+        def __init__(self):
+            m.BaseN5.__init__(self, 5)
+            m.BaseN6.__init__(self, 6)
+            m.BaseN7.__init__(self, 7)
+            m.BaseN8.__init__(self, 8)
+
+    class MIMany916(m.BaseN9, m.BaseN10, m.BaseN11, m.BaseN12, m.BaseN13, m.BaseN14, m.BaseN15,
+                    m.BaseN16):
+        def __init__(self):
+            m.BaseN9.__init__(self, 9)
+            m.BaseN10.__init__(self, 10)
+            m.BaseN11.__init__(self, 11)
+            m.BaseN12.__init__(self, 12)
+            m.BaseN13.__init__(self, 13)
+            m.BaseN14.__init__(self, 14)
+            m.BaseN15.__init__(self, 15)
+            m.BaseN16.__init__(self, 16)
+
+    class MIMany19(MIMany14, MIMany58, m.BaseN9):
+        def __init__(self):
+            MIMany14.__init__(self)
+            MIMany58.__init__(self)
+            m.BaseN9.__init__(self, 9)
+
+    class MIMany117(MIMany14, MIMany58, MIMany916, m.BaseN17):
+        def __init__(self):
+            MIMany14.__init__(self)
+            MIMany58.__init__(self)
+            MIMany916.__init__(self)
+            m.BaseN17.__init__(self, 17)
+
+    # Inherits from 4 registered C++ classes: can fit in one pointer on any modern arch:
+    a = MIMany14()
+    for i in range(1, 4):
+        assert getattr(a, "f" + str(i))() == 2 * i
+
+    # Inherits from 8: requires 1/2 pointers worth of holder flags on 32/64-bit arch:
+    b = MIMany916()
+    for i in range(9, 16):
+        assert getattr(b, "f" + str(i))() == 2 * i
+
+    # Inherits from 9: requires >= 2 pointers worth of holder flags
+    c = MIMany19()
+    for i in range(1, 9):
+        assert getattr(c, "f" + str(i))() == 2 * i
+
+    # Inherits from 17: requires >= 3 pointers worth of holder flags
+    d = MIMany117()
+    for i in range(1, 17):
+        assert getattr(d, "f" + str(i))() == 2 * i
+
+
+def test_multiple_inheritance_virtbase():
+
+    class MITypePy(m.Base12a):
+        def __init__(self, i, j):
+            m.Base12a.__init__(self, i, j)
+
+    mt = MITypePy(3, 4)
+    assert mt.bar() == 4
+    assert m.bar_base2a(mt) == 4
+    assert m.bar_base2a_sharedptr(mt) == 4
+
+
+def test_mi_static_properties():
+    """Mixing bases with and without static properties should be possible
+     and the result should be independent of base definition order"""
+
+    for d in (m.VanillaStaticMix1(), m.VanillaStaticMix2()):
+        assert d.vanilla() == "Vanilla"
+        assert d.static_func1() == "WithStatic1"
+        assert d.static_func2() == "WithStatic2"
+        assert d.static_func() == d.__class__.__name__
+
+        m.WithStatic1.static_value1 = 1
+        m.WithStatic2.static_value2 = 2
+        assert d.static_value1 == 1
+        assert d.static_value2 == 2
+        assert d.static_value == 12
+
+        d.static_value1 = 0
+        assert d.static_value1 == 0
+        d.static_value2 = 0
+        assert d.static_value2 == 0
+        d.static_value = 0
+        assert d.static_value == 0
+
+
+@pytest.unsupported_on_pypy
+def test_mi_dynamic_attributes():
+    """Mixing bases with and without dynamic attribute support"""
+
+    for d in (m.VanillaDictMix1(), m.VanillaDictMix2()):
+        d.dynamic = 1
+        assert d.dynamic == 1
+
+
+def test_mi_unaligned_base():
+    """Returning an offset (non-first MI) base class pointer should recognize the instance"""
+
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    c = m.I801C()
+    d = m.I801D()
+    # + 4 below because we have the two instances, and each instance has offset base I801B2
+    assert ConstructorStats.detail_reg_inst() == n_inst + 4
+    b1c = m.i801b1_c(c)
+    assert b1c is c
+    b2c = m.i801b2_c(c)
+    assert b2c is c
+    b1d = m.i801b1_d(d)
+    assert b1d is d
+    b2d = m.i801b2_d(d)
+    assert b2d is d
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 4  # no extra instances
+    del c, b1c, b2c
+    assert ConstructorStats.detail_reg_inst() == n_inst + 2
+    del d, b1d, b2d
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+
+def test_mi_base_return():
+    """Tests returning an offset (non-first MI) base class pointer to a derived instance"""
+
+    n_inst = ConstructorStats.detail_reg_inst()
+
+    c1 = m.i801c_b1()
+    assert type(c1) is m.I801C
+    assert c1.a == 1
+    assert c1.b == 2
+
+    d1 = m.i801d_b1()
+    assert type(d1) is m.I801D
+    assert d1.a == 1
+    assert d1.b == 2
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 4
+
+    c2 = m.i801c_b2()
+    assert type(c2) is m.I801C
+    assert c2.a == 1
+    assert c2.b == 2
+
+    d2 = m.i801d_b2()
+    assert type(d2) is m.I801D
+    assert d2.a == 1
+    assert d2.b == 2
+
+    assert ConstructorStats.detail_reg_inst() == n_inst + 8
+
+    del c2
+    assert ConstructorStats.detail_reg_inst() == n_inst + 6
+    del c1, d1, d2
+    assert ConstructorStats.detail_reg_inst() == n_inst
+
+    # Returning an unregistered derived type with a registered base; we won't
+    # pick up the derived type, obviously, but should still work (as an object
+    # of whatever type was returned).
+    e1 = m.i801e_c()
+    assert type(e1) is m.I801C
+    assert e1.a == 1
+    assert e1.b == 2
+
+    e2 = m.i801e_b2()
+    assert type(e2) is m.I801B2
+    assert e2.b == 2
+
+
+def test_diamond_inheritance():
+    """Tests that diamond inheritance works as expected (issue #959)"""
+
+    # Issue #959: this shouldn't segfault:
+    d = m.D()
+
+    # Make sure all the various distinct pointers are all recognized as registered instances:
+    assert d is d.c0()
+    assert d is d.c1()
+    assert d is d.b()
+    assert d is d.c0().b()
+    assert d is d.c1().b()
+    assert d is d.c0().c1().b().c0().b()
diff --git a/3rdparty/pybind11/tests/test_numpy_array.cpp b/3rdparty/pybind11/tests/test_numpy_array.cpp
new file mode 100644
index 00000000..156a3bfa
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_numpy_array.cpp
@@ -0,0 +1,390 @@
+/*
+    tests/test_numpy_array.cpp -- test core array functionality
+
+    Copyright (c) 2016 Ivan Smirnov <i.s.smirnov@gmail.com>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+#include <pybind11/numpy.h>
+#include <pybind11/stl.h>
+
+#include <cstdint>
+
+// Size / dtype checks.
+struct DtypeCheck {
+    py::dtype numpy{};
+    py::dtype pybind11{};
+};
+
+template <typename T>
+DtypeCheck get_dtype_check(const char* name) {
+    py::module np = py::module::import("numpy");
+    DtypeCheck check{};
+    check.numpy = np.attr("dtype")(np.attr(name));
+    check.pybind11 = py::dtype::of<T>();
+    return check;
+}
+
+std::vector<DtypeCheck> get_concrete_dtype_checks() {
+    return {
+        // Normalization
+        get_dtype_check<std::int8_t>("int8"),
+        get_dtype_check<std::uint8_t>("uint8"),
+        get_dtype_check<std::int16_t>("int16"),
+        get_dtype_check<std::uint16_t>("uint16"),
+        get_dtype_check<std::int32_t>("int32"),
+        get_dtype_check<std::uint32_t>("uint32"),
+        get_dtype_check<std::int64_t>("int64"),
+        get_dtype_check<std::uint64_t>("uint64")
+    };
+}
+
+struct DtypeSizeCheck {
+    std::string name{};
+    int size_cpp{};
+    int size_numpy{};
+    // For debugging.
+    py::dtype dtype{};
+};
+
+template <typename T>
+DtypeSizeCheck get_dtype_size_check() {
+    DtypeSizeCheck check{};
+    check.name = py::type_id<T>();
+    check.size_cpp = sizeof(T);
+    check.dtype = py::dtype::of<T>();
+    check.size_numpy = check.dtype.attr("itemsize").template cast<int>();
+    return check;
+}
+
+std::vector<DtypeSizeCheck> get_platform_dtype_size_checks() {
+    return {
+        get_dtype_size_check<short>(),
+        get_dtype_size_check<unsigned short>(),
+        get_dtype_size_check<int>(),
+        get_dtype_size_check<unsigned int>(),
+        get_dtype_size_check<long>(),
+        get_dtype_size_check<unsigned long>(),
+        get_dtype_size_check<long long>(),
+        get_dtype_size_check<unsigned long long>(),
+    };
+}
+
+// Arrays.
+using arr = py::array;
+using arr_t = py::array_t<uint16_t, 0>;
+static_assert(std::is_same<arr_t::value_type, uint16_t>::value, "");
+
+template<typename... Ix> arr data(const arr& a, Ix... index) {
+    return arr(a.nbytes() - a.offset_at(index...), (const uint8_t *) a.data(index...));
+}
+
+template<typename... Ix> arr data_t(const arr_t& a, Ix... index) {
+    return arr(a.size() - a.index_at(index...), a.data(index...));
+}
+
+template<typename... Ix> arr& mutate_data(arr& a, Ix... index) {
+    auto ptr = (uint8_t *) a.mutable_data(index...);
+    for (ssize_t i = 0; i < a.nbytes() - a.offset_at(index...); i++)
+        ptr[i] = (uint8_t) (ptr[i] * 2);
+    return a;
+}
+
+template<typename... Ix> arr_t& mutate_data_t(arr_t& a, Ix... index) {
+    auto ptr = a.mutable_data(index...);
+    for (ssize_t i = 0; i < a.size() - a.index_at(index...); i++)
+        ptr[i]++;
+    return a;
+}
+
+template<typename... Ix> ssize_t index_at(const arr& a, Ix... idx) { return a.index_at(idx...); }
+template<typename... Ix> ssize_t index_at_t(const arr_t& a, Ix... idx) { return a.index_at(idx...); }
+template<typename... Ix> ssize_t offset_at(const arr& a, Ix... idx) { return a.offset_at(idx...); }
+template<typename... Ix> ssize_t offset_at_t(const arr_t& a, Ix... idx) { return a.offset_at(idx...); }
+template<typename... Ix> ssize_t at_t(const arr_t& a, Ix... idx) { return a.at(idx...); }
+template<typename... Ix> arr_t& mutate_at_t(arr_t& a, Ix... idx) { a.mutable_at(idx...)++; return a; }
+
+#define def_index_fn(name, type) \
+    sm.def(#name, [](type a) { return name(a); }); \
+    sm.def(#name, [](type a, int i) { return name(a, i); }); \
+    sm.def(#name, [](type a, int i, int j) { return name(a, i, j); }); \
+    sm.def(#name, [](type a, int i, int j, int k) { return name(a, i, j, k); });
+
+template <typename T, typename T2> py::handle auxiliaries(T &&r, T2 &&r2) {
+    if (r.ndim() != 2) throw std::domain_error("error: ndim != 2");
+    py::list l;
+    l.append(*r.data(0, 0));
+    l.append(*r2.mutable_data(0, 0));
+    l.append(r.data(0, 1) == r2.mutable_data(0, 1));
+    l.append(r.ndim());
+    l.append(r.itemsize());
+    l.append(r.shape(0));
+    l.append(r.shape(1));
+    l.append(r.size());
+    l.append(r.nbytes());
+    return l.release();
+}
+
+// note: declaration at local scope would create a dangling reference!
+static int data_i = 42;
+
+TEST_SUBMODULE(numpy_array, sm) {
+    try { py::module::import("numpy"); }
+    catch (...) { return; }
+
+    // test_dtypes
+    py::class_<DtypeCheck>(sm, "DtypeCheck")
+        .def_readonly("numpy", &DtypeCheck::numpy)
+        .def_readonly("pybind11", &DtypeCheck::pybind11)
+        .def("__repr__", [](const DtypeCheck& self) {
+            return py::str("<DtypeCheck numpy={} pybind11={}>").format(
+                self.numpy, self.pybind11);
+        });
+    sm.def("get_concrete_dtype_checks", &get_concrete_dtype_checks);
+
+    py::class_<DtypeSizeCheck>(sm, "DtypeSizeCheck")
+        .def_readonly("name", &DtypeSizeCheck::name)
+        .def_readonly("size_cpp", &DtypeSizeCheck::size_cpp)
+        .def_readonly("size_numpy", &DtypeSizeCheck::size_numpy)
+        .def("__repr__", [](const DtypeSizeCheck& self) {
+            return py::str("<DtypeSizeCheck name='{}' size_cpp={} size_numpy={} dtype={}>").format(
+                self.name, self.size_cpp, self.size_numpy, self.dtype);
+        });
+    sm.def("get_platform_dtype_size_checks", &get_platform_dtype_size_checks);
+
+    // test_array_attributes
+    sm.def("ndim", [](const arr& a) { return a.ndim(); });
+    sm.def("shape", [](const arr& a) { return arr(a.ndim(), a.shape()); });
+    sm.def("shape", [](const arr& a, ssize_t dim) { return a.shape(dim); });
+    sm.def("strides", [](const arr& a) { return arr(a.ndim(), a.strides()); });
+    sm.def("strides", [](const arr& a, ssize_t dim) { return a.strides(dim); });
+    sm.def("writeable", [](const arr& a) { return a.writeable(); });
+    sm.def("size", [](const arr& a) { return a.size(); });
+    sm.def("itemsize", [](const arr& a) { return a.itemsize(); });
+    sm.def("nbytes", [](const arr& a) { return a.nbytes(); });
+    sm.def("owndata", [](const arr& a) { return a.owndata(); });
+
+    // test_index_offset
+    def_index_fn(index_at, const arr&);
+    def_index_fn(index_at_t, const arr_t&);
+    def_index_fn(offset_at, const arr&);
+    def_index_fn(offset_at_t, const arr_t&);
+    // test_data
+    def_index_fn(data, const arr&);
+    def_index_fn(data_t, const arr_t&);
+    // test_mutate_data, test_mutate_readonly
+    def_index_fn(mutate_data, arr&);
+    def_index_fn(mutate_data_t, arr_t&);
+    def_index_fn(at_t, const arr_t&);
+    def_index_fn(mutate_at_t, arr_t&);
+
+    // test_make_c_f_array
+    sm.def("make_f_array", [] { return py::array_t<float>({ 2, 2 }, { 4, 8 }); });
+    sm.def("make_c_array", [] { return py::array_t<float>({ 2, 2 }, { 8, 4 }); });
+
+    // test_empty_shaped_array
+    sm.def("make_empty_shaped_array", [] { return py::array(py::dtype("f"), {}, {}); });
+    // test numpy scalars (empty shape, ndim==0)
+    sm.def("scalar_int", []() { return py::array(py::dtype("i"), {}, {}, &data_i); });
+
+    // test_wrap
+    sm.def("wrap", [](py::array a) {
+        return py::array(
+            a.dtype(),
+            {a.shape(), a.shape() + a.ndim()},
+            {a.strides(), a.strides() + a.ndim()},
+            a.data(),
+            a
+        );
+    });
+
+    // test_numpy_view
+    struct ArrayClass {
+        int data[2] = { 1, 2 };
+        ArrayClass() { py::print("ArrayClass()"); }
+        ~ArrayClass() { py::print("~ArrayClass()"); }
+    };
+    py::class_<ArrayClass>(sm, "ArrayClass")
+        .def(py::init<>())
+        .def("numpy_view", [](py::object &obj) {
+            py::print("ArrayClass::numpy_view()");
+            ArrayClass &a = obj.cast<ArrayClass&>();
+            return py::array_t<int>({2}, {4}, a.data, obj);
+        }
+    );
+
+    // test_cast_numpy_int64_to_uint64
+    sm.def("function_taking_uint64", [](uint64_t) { });
+
+    // test_isinstance
+    sm.def("isinstance_untyped", [](py::object yes, py::object no) {
+        return py::isinstance<py::array>(yes) && !py::isinstance<py::array>(no);
+    });
+    sm.def("isinstance_typed", [](py::object o) {
+        return py::isinstance<py::array_t<double>>(o) && !py::isinstance<py::array_t<int>>(o);
+    });
+
+    // test_constructors
+    sm.def("default_constructors", []() {
+        return py::dict(
+            "array"_a=py::array(),
+            "array_t<int32>"_a=py::array_t<std::int32_t>(),
+            "array_t<double>"_a=py::array_t<double>()
+        );
+    });
+    sm.def("converting_constructors", [](py::object o) {
+        return py::dict(
+            "array"_a=py::array(o),
+            "array_t<int32>"_a=py::array_t<std::int32_t>(o),
+            "array_t<double>"_a=py::array_t<double>(o)
+        );
+    });
+
+    // test_overload_resolution
+    sm.def("overloaded", [](py::array_t<double>) { return "double"; });
+    sm.def("overloaded", [](py::array_t<float>) { return "float"; });
+    sm.def("overloaded", [](py::array_t<int>) { return "int"; });
+    sm.def("overloaded", [](py::array_t<unsigned short>) { return "unsigned short"; });
+    sm.def("overloaded", [](py::array_t<long long>) { return "long long"; });
+    sm.def("overloaded", [](py::array_t<std::complex<double>>) { return "double complex"; });
+    sm.def("overloaded", [](py::array_t<std::complex<float>>) { return "float complex"; });
+
+    sm.def("overloaded2", [](py::array_t<std::complex<double>>) { return "double complex"; });
+    sm.def("overloaded2", [](py::array_t<double>) { return "double"; });
+    sm.def("overloaded2", [](py::array_t<std::complex<float>>) { return "float complex"; });
+    sm.def("overloaded2", [](py::array_t<float>) { return "float"; });
+
+    // Only accept the exact types:
+    sm.def("overloaded3", [](py::array_t<int>) { return "int"; }, py::arg().noconvert());
+    sm.def("overloaded3", [](py::array_t<double>) { return "double"; }, py::arg().noconvert());
+
+    // Make sure we don't do unsafe coercion (e.g. float to int) when not using forcecast, but
+    // rather that float gets converted via the safe (conversion to double) overload:
+    sm.def("overloaded4", [](py::array_t<long long, 0>) { return "long long"; });
+    sm.def("overloaded4", [](py::array_t<double, 0>) { return "double"; });
+
+    // But we do allow conversion to int if forcecast is enabled (but only if no overload matches
+    // without conversion)
+    sm.def("overloaded5", [](py::array_t<unsigned int>) { return "unsigned int"; });
+    sm.def("overloaded5", [](py::array_t<double>) { return "double"; });
+
+    // test_greedy_string_overload
+    // Issue 685: ndarray shouldn't go to std::string overload
+    sm.def("issue685", [](std::string) { return "string"; });
+    sm.def("issue685", [](py::array) { return "array"; });
+    sm.def("issue685", [](py::object) { return "other"; });
+
+    // test_array_unchecked_fixed_dims
+    sm.def("proxy_add2", [](py::array_t<double> a, double v) {
+        auto r = a.mutable_unchecked<2>();
+        for (ssize_t i = 0; i < r.shape(0); i++)
+            for (ssize_t j = 0; j < r.shape(1); j++)
+                r(i, j) += v;
+    }, py::arg().noconvert(), py::arg());
+
+    sm.def("proxy_init3", [](double start) {
+        py::array_t<double, py::array::c_style> a({ 3, 3, 3 });
+        auto r = a.mutable_unchecked<3>();
+        for (ssize_t i = 0; i < r.shape(0); i++)
+        for (ssize_t j = 0; j < r.shape(1); j++)
+        for (ssize_t k = 0; k < r.shape(2); k++)
+            r(i, j, k) = start++;
+        return a;
+    });
+    sm.def("proxy_init3F", [](double start) {
+        py::array_t<double, py::array::f_style> a({ 3, 3, 3 });
+        auto r = a.mutable_unchecked<3>();
+        for (ssize_t k = 0; k < r.shape(2); k++)
+        for (ssize_t j = 0; j < r.shape(1); j++)
+        for (ssize_t i = 0; i < r.shape(0); i++)
+            r(i, j, k) = start++;
+        return a;
+    });
+    sm.def("proxy_squared_L2_norm", [](py::array_t<double> a) {
+        auto r = a.unchecked<1>();
+        double sumsq = 0;
+        for (ssize_t i = 0; i < r.shape(0); i++)
+            sumsq += r[i] * r(i); // Either notation works for a 1D array
+        return sumsq;
+    });
+
+    sm.def("proxy_auxiliaries2", [](py::array_t<double> a) {
+        auto r = a.unchecked<2>();
+        auto r2 = a.mutable_unchecked<2>();
+        return auxiliaries(r, r2);
+    });
+
+    // test_array_unchecked_dyn_dims
+    // Same as the above, but without a compile-time dimensions specification:
+    sm.def("proxy_add2_dyn", [](py::array_t<double> a, double v) {
+        auto r = a.mutable_unchecked();
+        if (r.ndim() != 2) throw std::domain_error("error: ndim != 2");
+        for (ssize_t i = 0; i < r.shape(0); i++)
+            for (ssize_t j = 0; j < r.shape(1); j++)
+                r(i, j) += v;
+    }, py::arg().noconvert(), py::arg());
+    sm.def("proxy_init3_dyn", [](double start) {
+        py::array_t<double, py::array::c_style> a({ 3, 3, 3 });
+        auto r = a.mutable_unchecked();
+        if (r.ndim() != 3) throw std::domain_error("error: ndim != 3");
+        for (ssize_t i = 0; i < r.shape(0); i++)
+        for (ssize_t j = 0; j < r.shape(1); j++)
+        for (ssize_t k = 0; k < r.shape(2); k++)
+            r(i, j, k) = start++;
+        return a;
+    });
+    sm.def("proxy_auxiliaries2_dyn", [](py::array_t<double> a) {
+        return auxiliaries(a.unchecked(), a.mutable_unchecked());
+    });
+
+    sm.def("array_auxiliaries2", [](py::array_t<double> a) {
+        return auxiliaries(a, a);
+    });
+
+    // test_array_failures
+    // Issue #785: Uninformative "Unknown internal error" exception when constructing array from empty object:
+    sm.def("array_fail_test", []() { return py::array(py::object()); });
+    sm.def("array_t_fail_test", []() { return py::array_t<double>(py::object()); });
+    // Make sure the error from numpy is being passed through:
+    sm.def("array_fail_test_negative_size", []() { int c = 0; return py::array(-1, &c); });
+
+    // test_initializer_list
+    // Issue (unnumbered; reported in #788): regression: initializer lists can be ambiguous
+    sm.def("array_initializer_list1", []() { return py::array_t<float>(1); }); // { 1 } also works, but clang warns about it
+    sm.def("array_initializer_list2", []() { return py::array_t<float>({ 1, 2 }); });
+    sm.def("array_initializer_list3", []() { return py::array_t<float>({ 1, 2, 3 }); });
+    sm.def("array_initializer_list4", []() { return py::array_t<float>({ 1, 2, 3, 4 }); });
+
+    // test_array_resize
+    // reshape array to 2D without changing size
+    sm.def("array_reshape2", [](py::array_t<double> a) {
+        const ssize_t dim_sz = (ssize_t)std::sqrt(a.size());
+        if (dim_sz * dim_sz != a.size())
+            throw std::domain_error("array_reshape2: input array total size is not a squared integer");
+        a.resize({dim_sz, dim_sz});
+    });
+
+    // resize to 3D array with each dimension = N
+    sm.def("array_resize3", [](py::array_t<double> a, size_t N, bool refcheck) {
+        a.resize({N, N, N}, refcheck);
+    });
+
+    // test_array_create_and_resize
+    // return 2D array with Nrows = Ncols = N
+    sm.def("create_and_resize", [](size_t N) {
+        py::array_t<double> a;
+        a.resize({N, N});
+        std::fill(a.mutable_data(), a.mutable_data() + a.size(), 42.);
+        return a;
+    });
+
+#if PY_MAJOR_VERSION >= 3
+        sm.def("index_using_ellipsis", [](py::array a) {
+            return a[py::make_tuple(0, py::ellipsis(), 0)];
+        });
+#endif
+}
diff --git a/3rdparty/pybind11/tests/test_numpy_array.py b/3rdparty/pybind11/tests/test_numpy_array.py
new file mode 100644
index 00000000..d0a6324d
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_numpy_array.py
@@ -0,0 +1,447 @@
+import pytest
+from pybind11_tests import numpy_array as m
+
+pytestmark = pytest.requires_numpy
+
+with pytest.suppress(ImportError):
+    import numpy as np
+
+
+def test_dtypes():
+    # See issue #1328.
+    # - Platform-dependent sizes.
+    for size_check in m.get_platform_dtype_size_checks():
+        print(size_check)
+        assert size_check.size_cpp == size_check.size_numpy, size_check
+    # - Concrete sizes.
+    for check in m.get_concrete_dtype_checks():
+        print(check)
+        assert check.numpy == check.pybind11, check
+        if check.numpy.num != check.pybind11.num:
+            print("NOTE: typenum mismatch for {}: {} != {}".format(
+                check, check.numpy.num, check.pybind11.num))
+
+
+@pytest.fixture(scope='function')
+def arr():
+    return np.array([[1, 2, 3], [4, 5, 6]], '=u2')
+
+
+def test_array_attributes():
+    a = np.array(0, 'f8')
+    assert m.ndim(a) == 0
+    assert all(m.shape(a) == [])
+    assert all(m.strides(a) == [])
+    with pytest.raises(IndexError) as excinfo:
+        m.shape(a, 0)
+    assert str(excinfo.value) == 'invalid axis: 0 (ndim = 0)'
+    with pytest.raises(IndexError) as excinfo:
+        m.strides(a, 0)
+    assert str(excinfo.value) == 'invalid axis: 0 (ndim = 0)'
+    assert m.writeable(a)
+    assert m.size(a) == 1
+    assert m.itemsize(a) == 8
+    assert m.nbytes(a) == 8
+    assert m.owndata(a)
+
+    a = np.array([[1, 2, 3], [4, 5, 6]], 'u2').view()
+    a.flags.writeable = False
+    assert m.ndim(a) == 2
+    assert all(m.shape(a) == [2, 3])
+    assert m.shape(a, 0) == 2
+    assert m.shape(a, 1) == 3
+    assert all(m.strides(a) == [6, 2])
+    assert m.strides(a, 0) == 6
+    assert m.strides(a, 1) == 2
+    with pytest.raises(IndexError) as excinfo:
+        m.shape(a, 2)
+    assert str(excinfo.value) == 'invalid axis: 2 (ndim = 2)'
+    with pytest.raises(IndexError) as excinfo:
+        m.strides(a, 2)
+    assert str(excinfo.value) == 'invalid axis: 2 (ndim = 2)'
+    assert not m.writeable(a)
+    assert m.size(a) == 6
+    assert m.itemsize(a) == 2
+    assert m.nbytes(a) == 12
+    assert not m.owndata(a)
+
+
+@pytest.mark.parametrize('args, ret', [([], 0), ([0], 0), ([1], 3), ([0, 1], 1), ([1, 2], 5)])
+def test_index_offset(arr, args, ret):
+    assert m.index_at(arr, *args) == ret
+    assert m.index_at_t(arr, *args) == ret
+    assert m.offset_at(arr, *args) == ret * arr.dtype.itemsize
+    assert m.offset_at_t(arr, *args) == ret * arr.dtype.itemsize
+
+
+def test_dim_check_fail(arr):
+    for func in (m.index_at, m.index_at_t, m.offset_at, m.offset_at_t, m.data, m.data_t,
+                 m.mutate_data, m.mutate_data_t):
+        with pytest.raises(IndexError) as excinfo:
+            func(arr, 1, 2, 3)
+        assert str(excinfo.value) == 'too many indices for an array: 3 (ndim = 2)'
+
+
+@pytest.mark.parametrize('args, ret',
+                         [([], [1, 2, 3, 4, 5, 6]),
+                          ([1], [4, 5, 6]),
+                          ([0, 1], [2, 3, 4, 5, 6]),
+                          ([1, 2], [6])])
+def test_data(arr, args, ret):
+    from sys import byteorder
+    assert all(m.data_t(arr, *args) == ret)
+    assert all(m.data(arr, *args)[(0 if byteorder == 'little' else 1)::2] == ret)
+    assert all(m.data(arr, *args)[(1 if byteorder == 'little' else 0)::2] == 0)
+
+
+@pytest.mark.parametrize('dim', [0, 1, 3])
+def test_at_fail(arr, dim):
+    for func in m.at_t, m.mutate_at_t:
+        with pytest.raises(IndexError) as excinfo:
+            func(arr, *([0] * dim))
+        assert str(excinfo.value) == 'index dimension mismatch: {} (ndim = 2)'.format(dim)
+
+
+def test_at(arr):
+    assert m.at_t(arr, 0, 2) == 3
+    assert m.at_t(arr, 1, 0) == 4
+
+    assert all(m.mutate_at_t(arr, 0, 2).ravel() == [1, 2, 4, 4, 5, 6])
+    assert all(m.mutate_at_t(arr, 1, 0).ravel() == [1, 2, 4, 5, 5, 6])
+
+
+def test_mutate_readonly(arr):
+    arr.flags.writeable = False
+    for func, args in (m.mutate_data, ()), (m.mutate_data_t, ()), (m.mutate_at_t, (0, 0)):
+        with pytest.raises(ValueError) as excinfo:
+            func(arr, *args)
+        assert str(excinfo.value) == 'array is not writeable'
+
+
+def test_mutate_data(arr):
+    assert all(m.mutate_data(arr).ravel() == [2, 4, 6, 8, 10, 12])
+    assert all(m.mutate_data(arr).ravel() == [4, 8, 12, 16, 20, 24])
+    assert all(m.mutate_data(arr, 1).ravel() == [4, 8, 12, 32, 40, 48])
+    assert all(m.mutate_data(arr, 0, 1).ravel() == [4, 16, 24, 64, 80, 96])
+    assert all(m.mutate_data(arr, 1, 2).ravel() == [4, 16, 24, 64, 80, 192])
+
+    assert all(m.mutate_data_t(arr).ravel() == [5, 17, 25, 65, 81, 193])
+    assert all(m.mutate_data_t(arr).ravel() == [6, 18, 26, 66, 82, 194])
+    assert all(m.mutate_data_t(arr, 1).ravel() == [6, 18, 26, 67, 83, 195])
+    assert all(m.mutate_data_t(arr, 0, 1).ravel() == [6, 19, 27, 68, 84, 196])
+    assert all(m.mutate_data_t(arr, 1, 2).ravel() == [6, 19, 27, 68, 84, 197])
+
+
+def test_bounds_check(arr):
+    for func in (m.index_at, m.index_at_t, m.data, m.data_t,
+                 m.mutate_data, m.mutate_data_t, m.at_t, m.mutate_at_t):
+        with pytest.raises(IndexError) as excinfo:
+            func(arr, 2, 0)
+        assert str(excinfo.value) == 'index 2 is out of bounds for axis 0 with size 2'
+        with pytest.raises(IndexError) as excinfo:
+            func(arr, 0, 4)
+        assert str(excinfo.value) == 'index 4 is out of bounds for axis 1 with size 3'
+
+
+def test_make_c_f_array():
+    assert m.make_c_array().flags.c_contiguous
+    assert not m.make_c_array().flags.f_contiguous
+    assert m.make_f_array().flags.f_contiguous
+    assert not m.make_f_array().flags.c_contiguous
+
+
+def test_make_empty_shaped_array():
+    m.make_empty_shaped_array()
+
+    # empty shape means numpy scalar, PEP 3118
+    assert m.scalar_int().ndim == 0
+    assert m.scalar_int().shape == ()
+    assert m.scalar_int() == 42
+
+
+def test_wrap():
+    def assert_references(a, b, base=None):
+        from distutils.version import LooseVersion
+        if base is None:
+            base = a
+        assert a is not b
+        assert a.__array_interface__['data'][0] == b.__array_interface__['data'][0]
+        assert a.shape == b.shape
+        assert a.strides == b.strides
+        assert a.flags.c_contiguous == b.flags.c_contiguous
+        assert a.flags.f_contiguous == b.flags.f_contiguous
+        assert a.flags.writeable == b.flags.writeable
+        assert a.flags.aligned == b.flags.aligned
+        if LooseVersion(np.__version__) >= LooseVersion("1.14.0"):
+            assert a.flags.writebackifcopy == b.flags.writebackifcopy
+        else:
+            assert a.flags.updateifcopy == b.flags.updateifcopy
+        assert np.all(a == b)
+        assert not b.flags.owndata
+        assert b.base is base
+        if a.flags.writeable and a.ndim == 2:
+            a[0, 0] = 1234
+            assert b[0, 0] == 1234
+
+    a1 = np.array([1, 2], dtype=np.int16)
+    assert a1.flags.owndata and a1.base is None
+    a2 = m.wrap(a1)
+    assert_references(a1, a2)
+
+    a1 = np.array([[1, 2], [3, 4]], dtype=np.float32, order='F')
+    assert a1.flags.owndata and a1.base is None
+    a2 = m.wrap(a1)
+    assert_references(a1, a2)
+
+    a1 = np.array([[1, 2], [3, 4]], dtype=np.float32, order='C')
+    a1.flags.writeable = False
+    a2 = m.wrap(a1)
+    assert_references(a1, a2)
+
+    a1 = np.random.random((4, 4, 4))
+    a2 = m.wrap(a1)
+    assert_references(a1, a2)
+
+    a1t = a1.transpose()
+    a2 = m.wrap(a1t)
+    assert_references(a1t, a2, a1)
+
+    a1d = a1.diagonal()
+    a2 = m.wrap(a1d)
+    assert_references(a1d, a2, a1)
+
+    a1m = a1[::-1, ::-1, ::-1]
+    a2 = m.wrap(a1m)
+    assert_references(a1m, a2, a1)
+
+
+def test_numpy_view(capture):
+    with capture:
+        ac = m.ArrayClass()
+        ac_view_1 = ac.numpy_view()
+        ac_view_2 = ac.numpy_view()
+        assert np.all(ac_view_1 == np.array([1, 2], dtype=np.int32))
+        del ac
+        pytest.gc_collect()
+    assert capture == """
+        ArrayClass()
+        ArrayClass::numpy_view()
+        ArrayClass::numpy_view()
+    """
+    ac_view_1[0] = 4
+    ac_view_1[1] = 3
+    assert ac_view_2[0] == 4
+    assert ac_view_2[1] == 3
+    with capture:
+        del ac_view_1
+        del ac_view_2
+        pytest.gc_collect()
+        pytest.gc_collect()
+    assert capture == """
+        ~ArrayClass()
+    """
+
+
+@pytest.unsupported_on_pypy
+def test_cast_numpy_int64_to_uint64():
+    m.function_taking_uint64(123)
+    m.function_taking_uint64(np.uint64(123))
+
+
+def test_isinstance():
+    assert m.isinstance_untyped(np.array([1, 2, 3]), "not an array")
+    assert m.isinstance_typed(np.array([1.0, 2.0, 3.0]))
+
+
+def test_constructors():
+    defaults = m.default_constructors()
+    for a in defaults.values():
+        assert a.size == 0
+    assert defaults["array"].dtype == np.array([]).dtype
+    assert defaults["array_t<int32>"].dtype == np.int32
+    assert defaults["array_t<double>"].dtype == np.float64
+
+    results = m.converting_constructors([1, 2, 3])
+    for a in results.values():
+        np.testing.assert_array_equal(a, [1, 2, 3])
+    assert results["array"].dtype == np.int_
+    assert results["array_t<int32>"].dtype == np.int32
+    assert results["array_t<double>"].dtype == np.float64
+
+
+def test_overload_resolution(msg):
+    # Exact overload matches:
+    assert m.overloaded(np.array([1], dtype='float64')) == 'double'
+    assert m.overloaded(np.array([1], dtype='float32')) == 'float'
+    assert m.overloaded(np.array([1], dtype='ushort')) == 'unsigned short'
+    assert m.overloaded(np.array([1], dtype='intc')) == 'int'
+    assert m.overloaded(np.array([1], dtype='longlong')) == 'long long'
+    assert m.overloaded(np.array([1], dtype='complex')) == 'double complex'
+    assert m.overloaded(np.array([1], dtype='csingle')) == 'float complex'
+
+    # No exact match, should call first convertible version:
+    assert m.overloaded(np.array([1], dtype='uint8')) == 'double'
+
+    with pytest.raises(TypeError) as excinfo:
+        m.overloaded("not an array")
+    assert msg(excinfo.value) == """
+        overloaded(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: numpy.ndarray[float64]) -> str
+            2. (arg0: numpy.ndarray[float32]) -> str
+            3. (arg0: numpy.ndarray[int32]) -> str
+            4. (arg0: numpy.ndarray[uint16]) -> str
+            5. (arg0: numpy.ndarray[int64]) -> str
+            6. (arg0: numpy.ndarray[complex128]) -> str
+            7. (arg0: numpy.ndarray[complex64]) -> str
+
+        Invoked with: 'not an array'
+    """
+
+    assert m.overloaded2(np.array([1], dtype='float64')) == 'double'
+    assert m.overloaded2(np.array([1], dtype='float32')) == 'float'
+    assert m.overloaded2(np.array([1], dtype='complex64')) == 'float complex'
+    assert m.overloaded2(np.array([1], dtype='complex128')) == 'double complex'
+    assert m.overloaded2(np.array([1], dtype='float32')) == 'float'
+
+    assert m.overloaded3(np.array([1], dtype='float64')) == 'double'
+    assert m.overloaded3(np.array([1], dtype='intc')) == 'int'
+    expected_exc = """
+        overloaded3(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: numpy.ndarray[int32]) -> str
+            2. (arg0: numpy.ndarray[float64]) -> str
+
+        Invoked with: """
+
+    with pytest.raises(TypeError) as excinfo:
+        m.overloaded3(np.array([1], dtype='uintc'))
+    assert msg(excinfo.value) == expected_exc + repr(np.array([1], dtype='uint32'))
+    with pytest.raises(TypeError) as excinfo:
+        m.overloaded3(np.array([1], dtype='float32'))
+    assert msg(excinfo.value) == expected_exc + repr(np.array([1.], dtype='float32'))
+    with pytest.raises(TypeError) as excinfo:
+        m.overloaded3(np.array([1], dtype='complex'))
+    assert msg(excinfo.value) == expected_exc + repr(np.array([1. + 0.j]))
+
+    # Exact matches:
+    assert m.overloaded4(np.array([1], dtype='double')) == 'double'
+    assert m.overloaded4(np.array([1], dtype='longlong')) == 'long long'
+    # Non-exact matches requiring conversion.  Since float to integer isn't a
+    # save conversion, it should go to the double overload, but short can go to
+    # either (and so should end up on the first-registered, the long long).
+    assert m.overloaded4(np.array([1], dtype='float32')) == 'double'
+    assert m.overloaded4(np.array([1], dtype='short')) == 'long long'
+
+    assert m.overloaded5(np.array([1], dtype='double')) == 'double'
+    assert m.overloaded5(np.array([1], dtype='uintc')) == 'unsigned int'
+    assert m.overloaded5(np.array([1], dtype='float32')) == 'unsigned int'
+
+
+def test_greedy_string_overload():
+    """Tests fix for #685 - ndarray shouldn't go to std::string overload"""
+
+    assert m.issue685("abc") == "string"
+    assert m.issue685(np.array([97, 98, 99], dtype='b')) == "array"
+    assert m.issue685(123) == "other"
+
+
+def test_array_unchecked_fixed_dims(msg):
+    z1 = np.array([[1, 2], [3, 4]], dtype='float64')
+    m.proxy_add2(z1, 10)
+    assert np.all(z1 == [[11, 12], [13, 14]])
+
+    with pytest.raises(ValueError) as excinfo:
+        m.proxy_add2(np.array([1., 2, 3]), 5.0)
+    assert msg(excinfo.value) == "array has incorrect number of dimensions: 1; expected 2"
+
+    expect_c = np.ndarray(shape=(3, 3, 3), buffer=np.array(range(3, 30)), dtype='int')
+    assert np.all(m.proxy_init3(3.0) == expect_c)
+    expect_f = np.transpose(expect_c)
+    assert np.all(m.proxy_init3F(3.0) == expect_f)
+
+    assert m.proxy_squared_L2_norm(np.array(range(6))) == 55
+    assert m.proxy_squared_L2_norm(np.array(range(6), dtype="float64")) == 55
+
+    assert m.proxy_auxiliaries2(z1) == [11, 11, True, 2, 8, 2, 2, 4, 32]
+    assert m.proxy_auxiliaries2(z1) == m.array_auxiliaries2(z1)
+
+
+def test_array_unchecked_dyn_dims(msg):
+    z1 = np.array([[1, 2], [3, 4]], dtype='float64')
+    m.proxy_add2_dyn(z1, 10)
+    assert np.all(z1 == [[11, 12], [13, 14]])
+
+    expect_c = np.ndarray(shape=(3, 3, 3), buffer=np.array(range(3, 30)), dtype='int')
+    assert np.all(m.proxy_init3_dyn(3.0) == expect_c)
+
+    assert m.proxy_auxiliaries2_dyn(z1) == [11, 11, True, 2, 8, 2, 2, 4, 32]
+    assert m.proxy_auxiliaries2_dyn(z1) == m.array_auxiliaries2(z1)
+
+
+def test_array_failure():
+    with pytest.raises(ValueError) as excinfo:
+        m.array_fail_test()
+    assert str(excinfo.value) == 'cannot create a pybind11::array from a nullptr'
+
+    with pytest.raises(ValueError) as excinfo:
+        m.array_t_fail_test()
+    assert str(excinfo.value) == 'cannot create a pybind11::array_t from a nullptr'
+
+    with pytest.raises(ValueError) as excinfo:
+        m.array_fail_test_negative_size()
+    assert str(excinfo.value) == 'negative dimensions are not allowed'
+
+
+def test_initializer_list():
+    assert m.array_initializer_list1().shape == (1,)
+    assert m.array_initializer_list2().shape == (1, 2)
+    assert m.array_initializer_list3().shape == (1, 2, 3)
+    assert m.array_initializer_list4().shape == (1, 2, 3, 4)
+
+
+def test_array_resize(msg):
+    a = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9], dtype='float64')
+    m.array_reshape2(a)
+    assert(a.size == 9)
+    assert(np.all(a == [[1, 2, 3], [4, 5, 6], [7, 8, 9]]))
+
+    # total size change should succced with refcheck off
+    m.array_resize3(a, 4, False)
+    assert(a.size == 64)
+    # ... and fail with refcheck on
+    try:
+        m.array_resize3(a, 3, True)
+    except ValueError as e:
+        assert(str(e).startswith("cannot resize an array"))
+    # transposed array doesn't own data
+    b = a.transpose()
+    try:
+        m.array_resize3(b, 3, False)
+    except ValueError as e:
+        assert(str(e).startswith("cannot resize this array: it does not own its data"))
+    # ... but reshape should be fine
+    m.array_reshape2(b)
+    assert(b.shape == (8, 8))
+
+
+@pytest.unsupported_on_pypy
+def test_array_create_and_resize(msg):
+    a = m.create_and_resize(2)
+    assert(a.size == 4)
+    assert(np.all(a == 42.))
+
+
+@pytest.unsupported_on_py2
+def test_index_using_ellipsis():
+    a = m.index_using_ellipsis(np.zeros((5, 6, 7)))
+    assert a.shape == (6,)
+
+
+@pytest.unsupported_on_pypy
+def test_dtype_refcount_leak():
+    from sys import getrefcount
+    dtype = np.dtype(np.float_)
+    a = np.array([1], dtype=dtype)
+    before = getrefcount(dtype)
+    m.ndim(a)
+    after = getrefcount(dtype)
+    assert after == before
diff --git a/3rdparty/pybind11/tests/test_numpy_dtypes.cpp b/3rdparty/pybind11/tests/test_numpy_dtypes.cpp
new file mode 100644
index 00000000..467e0253
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_numpy_dtypes.cpp
@@ -0,0 +1,474 @@
+/*
+  tests/test_numpy_dtypes.cpp -- Structured and compound NumPy dtypes
+
+  Copyright (c) 2016 Ivan Smirnov
+
+  All rights reserved. Use of this source code is governed by a
+  BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/numpy.h>
+
+#ifdef __GNUC__
+#define PYBIND11_PACKED(cls) cls __attribute__((__packed__))
+#else
+#define PYBIND11_PACKED(cls) __pragma(pack(push, 1)) cls __pragma(pack(pop))
+#endif
+
+namespace py = pybind11;
+
+struct SimpleStruct {
+    bool bool_;
+    uint32_t uint_;
+    float float_;
+    long double ldbl_;
+};
+
+std::ostream& operator<<(std::ostream& os, const SimpleStruct& v) {
+    return os << "s:" << v.bool_ << "," << v.uint_ << "," << v.float_ << "," << v.ldbl_;
+}
+
+struct SimpleStructReordered {
+    bool bool_;
+    float float_;
+    uint32_t uint_;
+    long double ldbl_;
+};
+
+PYBIND11_PACKED(struct PackedStruct {
+    bool bool_;
+    uint32_t uint_;
+    float float_;
+    long double ldbl_;
+});
+
+std::ostream& operator<<(std::ostream& os, const PackedStruct& v) {
+    return os << "p:" << v.bool_ << "," << v.uint_ << "," << v.float_ << "," << v.ldbl_;
+}
+
+PYBIND11_PACKED(struct NestedStruct {
+    SimpleStruct a;
+    PackedStruct b;
+});
+
+std::ostream& operator<<(std::ostream& os, const NestedStruct& v) {
+    return os << "n:a=" << v.a << ";b=" << v.b;
+}
+
+struct PartialStruct {
+    bool bool_;
+    uint32_t uint_;
+    float float_;
+    uint64_t dummy2;
+    long double ldbl_;
+};
+
+struct PartialNestedStruct {
+    uint64_t dummy1;
+    PartialStruct a;
+    uint64_t dummy2;
+};
+
+struct UnboundStruct { };
+
+struct StringStruct {
+    char a[3];
+    std::array<char, 3> b;
+};
+
+struct ComplexStruct {
+    std::complex<float> cflt;
+    std::complex<double> cdbl;
+};
+
+std::ostream& operator<<(std::ostream& os, const ComplexStruct& v) {
+    return os << "c:" << v.cflt << "," << v.cdbl;
+}
+
+struct ArrayStruct {
+    char a[3][4];
+    int32_t b[2];
+    std::array<uint8_t, 3> c;
+    std::array<float, 2> d[4];
+};
+
+PYBIND11_PACKED(struct StructWithUglyNames {
+    int8_t __x__;
+    uint64_t __y__;
+});
+
+enum class E1 : int64_t { A = -1, B = 1 };
+enum E2 : uint8_t { X = 1, Y = 2 };
+
+PYBIND11_PACKED(struct EnumStruct {
+    E1 e1;
+    E2 e2;
+});
+
+std::ostream& operator<<(std::ostream& os, const StringStruct& v) {
+    os << "a='";
+    for (size_t i = 0; i < 3 && v.a[i]; i++) os << v.a[i];
+    os << "',b='";
+    for (size_t i = 0; i < 3 && v.b[i]; i++) os << v.b[i];
+    return os << "'";
+}
+
+std::ostream& operator<<(std::ostream& os, const ArrayStruct& v) {
+    os << "a={";
+    for (int i = 0; i < 3; i++) {
+        if (i > 0)
+            os << ',';
+        os << '{';
+        for (int j = 0; j < 3; j++)
+            os << v.a[i][j] << ',';
+        os << v.a[i][3] << '}';
+    }
+    os << "},b={" << v.b[0] << ',' << v.b[1];
+    os << "},c={" << int(v.c[0]) << ',' << int(v.c[1]) << ',' << int(v.c[2]);
+    os << "},d={";
+    for (int i = 0; i < 4; i++) {
+        if (i > 0)
+            os << ',';
+        os << '{' << v.d[i][0] << ',' << v.d[i][1] << '}';
+    }
+    return os << '}';
+}
+
+std::ostream& operator<<(std::ostream& os, const EnumStruct& v) {
+    return os << "e1=" << (v.e1 == E1::A ? "A" : "B") << ",e2=" << (v.e2 == E2::X ? "X" : "Y");
+}
+
+template <typename T>
+py::array mkarray_via_buffer(size_t n) {
+    return py::array(py::buffer_info(nullptr, sizeof(T),
+                                     py::format_descriptor<T>::format(),
+                                     1, { n }, { sizeof(T) }));
+}
+
+#define SET_TEST_VALS(s, i) do { \
+    s.bool_ = (i) % 2 != 0; \
+    s.uint_ = (uint32_t) (i); \
+    s.float_ = (float) (i) * 1.5f; \
+    s.ldbl_ = (long double) (i) * -2.5L; } while (0)
+
+template <typename S>
+py::array_t<S, 0> create_recarray(size_t n) {
+    auto arr = mkarray_via_buffer<S>(n);
+    auto req = arr.request();
+    auto ptr = static_cast<S*>(req.ptr);
+    for (size_t i = 0; i < n; i++) {
+        SET_TEST_VALS(ptr[i], i);
+    }
+    return arr;
+}
+
+template <typename S>
+py::list print_recarray(py::array_t<S, 0> arr) {
+    const auto req = arr.request();
+    const auto ptr = static_cast<S*>(req.ptr);
+    auto l = py::list();
+    for (ssize_t i = 0; i < req.size; i++) {
+        std::stringstream ss;
+        ss << ptr[i];
+        l.append(py::str(ss.str()));
+    }
+    return l;
+}
+
+py::array_t<int32_t, 0> test_array_ctors(int i) {
+    using arr_t = py::array_t<int32_t, 0>;
+
+    std::vector<int32_t> data { 1, 2, 3, 4, 5, 6 };
+    std::vector<ssize_t> shape { 3, 2 };
+    std::vector<ssize_t> strides { 8, 4 };
+
+    auto ptr = data.data();
+    auto vptr = (void *) ptr;
+    auto dtype = py::dtype("int32");
+
+    py::buffer_info buf_ndim1(vptr, 4, "i", 6);
+    py::buffer_info buf_ndim1_null(nullptr, 4, "i", 6);
+    py::buffer_info buf_ndim2(vptr, 4, "i", 2, shape, strides);
+    py::buffer_info buf_ndim2_null(nullptr, 4, "i", 2, shape, strides);
+
+    auto fill = [](py::array arr) {
+        auto req = arr.request();
+        for (int i = 0; i < 6; i++) ((int32_t *) req.ptr)[i] = i + 1;
+        return arr;
+    };
+
+    switch (i) {
+    // shape: (3, 2)
+    case 10: return arr_t(shape, strides, ptr);
+    case 11: return py::array(shape, strides, ptr);
+    case 12: return py::array(dtype, shape, strides, vptr);
+    case 13: return arr_t(shape, ptr);
+    case 14: return py::array(shape, ptr);
+    case 15: return py::array(dtype, shape, vptr);
+    case 16: return arr_t(buf_ndim2);
+    case 17: return py::array(buf_ndim2);
+    // shape: (3, 2) - post-fill
+    case 20: return fill(arr_t(shape, strides));
+    case 21: return py::array(shape, strides, ptr); // can't have nullptr due to templated ctor
+    case 22: return fill(py::array(dtype, shape, strides));
+    case 23: return fill(arr_t(shape));
+    case 24: return py::array(shape, ptr); // can't have nullptr due to templated ctor
+    case 25: return fill(py::array(dtype, shape));
+    case 26: return fill(arr_t(buf_ndim2_null));
+    case 27: return fill(py::array(buf_ndim2_null));
+    // shape: (6, )
+    case 30: return arr_t(6, ptr);
+    case 31: return py::array(6, ptr);
+    case 32: return py::array(dtype, 6, vptr);
+    case 33: return arr_t(buf_ndim1);
+    case 34: return py::array(buf_ndim1);
+    // shape: (6, )
+    case 40: return fill(arr_t(6));
+    case 41: return py::array(6, ptr);  // can't have nullptr due to templated ctor
+    case 42: return fill(py::array(dtype, 6));
+    case 43: return fill(arr_t(buf_ndim1_null));
+    case 44: return fill(py::array(buf_ndim1_null));
+    }
+    return arr_t();
+}
+
+py::list test_dtype_ctors() {
+    py::list list;
+    list.append(py::dtype("int32"));
+    list.append(py::dtype(std::string("float64")));
+    list.append(py::dtype::from_args(py::str("bool")));
+    py::list names, offsets, formats;
+    py::dict dict;
+    names.append(py::str("a")); names.append(py::str("b")); dict["names"] = names;
+    offsets.append(py::int_(1)); offsets.append(py::int_(10)); dict["offsets"] = offsets;
+    formats.append(py::dtype("int32")); formats.append(py::dtype("float64")); dict["formats"] = formats;
+    dict["itemsize"] = py::int_(20);
+    list.append(py::dtype::from_args(dict));
+    list.append(py::dtype(names, formats, offsets, 20));
+    list.append(py::dtype(py::buffer_info((void *) 0, sizeof(unsigned int), "I", 1)));
+    list.append(py::dtype(py::buffer_info((void *) 0, 0, "T{i:a:f:b:}", 1)));
+    return list;
+}
+
+struct A {};
+struct B {};
+
+TEST_SUBMODULE(numpy_dtypes, m) {
+    try { py::module::import("numpy"); }
+    catch (...) { return; }
+
+    // typeinfo may be registered before the dtype descriptor for scalar casts to work...
+    py::class_<SimpleStruct>(m, "SimpleStruct");
+
+    PYBIND11_NUMPY_DTYPE(SimpleStruct, bool_, uint_, float_, ldbl_);
+    PYBIND11_NUMPY_DTYPE(SimpleStructReordered, bool_, uint_, float_, ldbl_);
+    PYBIND11_NUMPY_DTYPE(PackedStruct, bool_, uint_, float_, ldbl_);
+    PYBIND11_NUMPY_DTYPE(NestedStruct, a, b);
+    PYBIND11_NUMPY_DTYPE(PartialStruct, bool_, uint_, float_, ldbl_);
+    PYBIND11_NUMPY_DTYPE(PartialNestedStruct, a);
+    PYBIND11_NUMPY_DTYPE(StringStruct, a, b);
+    PYBIND11_NUMPY_DTYPE(ArrayStruct, a, b, c, d);
+    PYBIND11_NUMPY_DTYPE(EnumStruct, e1, e2);
+    PYBIND11_NUMPY_DTYPE(ComplexStruct, cflt, cdbl);
+
+    // ... or after
+    py::class_<PackedStruct>(m, "PackedStruct");
+
+    PYBIND11_NUMPY_DTYPE_EX(StructWithUglyNames, __x__, "x", __y__, "y");
+
+    // If uncommented, this should produce a static_assert failure telling the user that the struct
+    // is not a POD type
+//    struct NotPOD { std::string v; NotPOD() : v("hi") {}; };
+//    PYBIND11_NUMPY_DTYPE(NotPOD, v);
+
+    // Check that dtypes can be registered programmatically, both from
+    // initializer lists of field descriptors and from other containers.
+    py::detail::npy_format_descriptor<A>::register_dtype(
+        {}
+    );
+    py::detail::npy_format_descriptor<B>::register_dtype(
+        std::vector<py::detail::field_descriptor>{}
+    );
+
+    // test_recarray, test_scalar_conversion
+    m.def("create_rec_simple", &create_recarray<SimpleStruct>);
+    m.def("create_rec_packed", &create_recarray<PackedStruct>);
+    m.def("create_rec_nested", [](size_t n) { // test_signature
+        py::array_t<NestedStruct, 0> arr = mkarray_via_buffer<NestedStruct>(n);
+        auto req = arr.request();
+        auto ptr = static_cast<NestedStruct*>(req.ptr);
+        for (size_t i = 0; i < n; i++) {
+            SET_TEST_VALS(ptr[i].a, i);
+            SET_TEST_VALS(ptr[i].b, i + 1);
+        }
+        return arr;
+    });
+    m.def("create_rec_partial", &create_recarray<PartialStruct>);
+    m.def("create_rec_partial_nested", [](size_t n) {
+        py::array_t<PartialNestedStruct, 0> arr = mkarray_via_buffer<PartialNestedStruct>(n);
+        auto req = arr.request();
+        auto ptr = static_cast<PartialNestedStruct*>(req.ptr);
+        for (size_t i = 0; i < n; i++) {
+            SET_TEST_VALS(ptr[i].a, i);
+        }
+        return arr;
+    });
+    m.def("print_rec_simple", &print_recarray<SimpleStruct>);
+    m.def("print_rec_packed", &print_recarray<PackedStruct>);
+    m.def("print_rec_nested", &print_recarray<NestedStruct>);
+
+    // test_format_descriptors
+    m.def("get_format_unbound", []() { return py::format_descriptor<UnboundStruct>::format(); });
+    m.def("print_format_descriptors", []() {
+        py::list l;
+        for (const auto &fmt : {
+            py::format_descriptor<SimpleStruct>::format(),
+            py::format_descriptor<PackedStruct>::format(),
+            py::format_descriptor<NestedStruct>::format(),
+            py::format_descriptor<PartialStruct>::format(),
+            py::format_descriptor<PartialNestedStruct>::format(),
+            py::format_descriptor<StringStruct>::format(),
+            py::format_descriptor<ArrayStruct>::format(),
+            py::format_descriptor<EnumStruct>::format(),
+            py::format_descriptor<ComplexStruct>::format()
+        }) {
+            l.append(py::cast(fmt));
+        }
+        return l;
+    });
+
+    // test_dtype
+    m.def("print_dtypes", []() {
+        py::list l;
+        for (const py::handle &d : {
+            py::dtype::of<SimpleStruct>(),
+            py::dtype::of<PackedStruct>(),
+            py::dtype::of<NestedStruct>(),
+            py::dtype::of<PartialStruct>(),
+            py::dtype::of<PartialNestedStruct>(),
+            py::dtype::of<StringStruct>(),
+            py::dtype::of<ArrayStruct>(),
+            py::dtype::of<EnumStruct>(),
+            py::dtype::of<StructWithUglyNames>(),
+            py::dtype::of<ComplexStruct>()
+        })
+            l.append(py::str(d));
+        return l;
+    });
+    m.def("test_dtype_ctors", &test_dtype_ctors);
+    m.def("test_dtype_methods", []() {
+        py::list list;
+        auto dt1 = py::dtype::of<int32_t>();
+        auto dt2 = py::dtype::of<SimpleStruct>();
+        list.append(dt1); list.append(dt2);
+        list.append(py::bool_(dt1.has_fields())); list.append(py::bool_(dt2.has_fields()));
+        list.append(py::int_(dt1.itemsize())); list.append(py::int_(dt2.itemsize()));
+        return list;
+    });
+    struct TrailingPaddingStruct {
+        int32_t a;
+        char b;
+    };
+    PYBIND11_NUMPY_DTYPE(TrailingPaddingStruct, a, b);
+    m.def("trailing_padding_dtype", []() { return py::dtype::of<TrailingPaddingStruct>(); });
+
+    // test_string_array
+    m.def("create_string_array", [](bool non_empty) {
+        py::array_t<StringStruct, 0> arr = mkarray_via_buffer<StringStruct>(non_empty ? 4 : 0);
+        if (non_empty) {
+            auto req = arr.request();
+            auto ptr = static_cast<StringStruct*>(req.ptr);
+            for (ssize_t i = 0; i < req.size * req.itemsize; i++)
+                static_cast<char*>(req.ptr)[i] = 0;
+            ptr[1].a[0] = 'a'; ptr[1].b[0] = 'a';
+            ptr[2].a[0] = 'a'; ptr[2].b[0] = 'a';
+            ptr[3].a[0] = 'a'; ptr[3].b[0] = 'a';
+
+            ptr[2].a[1] = 'b'; ptr[2].b[1] = 'b';
+            ptr[3].a[1] = 'b'; ptr[3].b[1] = 'b';
+
+            ptr[3].a[2] = 'c'; ptr[3].b[2] = 'c';
+        }
+        return arr;
+    });
+    m.def("print_string_array", &print_recarray<StringStruct>);
+
+    // test_array_array
+    m.def("create_array_array", [](size_t n) {
+        py::array_t<ArrayStruct, 0> arr = mkarray_via_buffer<ArrayStruct>(n);
+        auto ptr = (ArrayStruct *) arr.mutable_data();
+        for (size_t i = 0; i < n; i++) {
+            for (size_t j = 0; j < 3; j++)
+                for (size_t k = 0; k < 4; k++)
+                    ptr[i].a[j][k] = char('A' + (i * 100 + j * 10 + k) % 26);
+            for (size_t j = 0; j < 2; j++)
+                ptr[i].b[j] = int32_t(i * 1000 + j);
+            for (size_t j = 0; j < 3; j++)
+                ptr[i].c[j] = uint8_t(i * 10 + j);
+            for (size_t j = 0; j < 4; j++)
+                for (size_t k = 0; k < 2; k++)
+                    ptr[i].d[j][k] = float(i) * 100.0f + float(j) * 10.0f + float(k);
+        }
+        return arr;
+    });
+    m.def("print_array_array", &print_recarray<ArrayStruct>);
+
+    // test_enum_array
+    m.def("create_enum_array", [](size_t n) {
+        py::array_t<EnumStruct, 0> arr = mkarray_via_buffer<EnumStruct>(n);
+        auto ptr = (EnumStruct *) arr.mutable_data();
+        for (size_t i = 0; i < n; i++) {
+            ptr[i].e1 = static_cast<E1>(-1 + ((int) i % 2) * 2);
+            ptr[i].e2 = static_cast<E2>(1 + (i % 2));
+        }
+        return arr;
+    });
+    m.def("print_enum_array", &print_recarray<EnumStruct>);
+
+    // test_complex_array
+    m.def("create_complex_array", [](size_t n) {
+        py::array_t<ComplexStruct, 0> arr = mkarray_via_buffer<ComplexStruct>(n);
+        auto ptr = (ComplexStruct *) arr.mutable_data();
+        for (size_t i = 0; i < n; i++) {
+            ptr[i].cflt.real(float(i));
+            ptr[i].cflt.imag(float(i) + 0.25f);
+            ptr[i].cdbl.real(double(i) + 0.5);
+            ptr[i].cdbl.imag(double(i) + 0.75);
+        }
+        return arr;
+    });
+    m.def("print_complex_array", &print_recarray<ComplexStruct>);
+
+    // test_array_constructors
+    m.def("test_array_ctors", &test_array_ctors);
+
+    // test_compare_buffer_info
+    struct CompareStruct {
+        bool x;
+        uint32_t y;
+        float z;
+    };
+    PYBIND11_NUMPY_DTYPE(CompareStruct, x, y, z);
+    m.def("compare_buffer_info", []() {
+        py::list list;
+        list.append(py::bool_(py::detail::compare_buffer_info<float>::compare(py::buffer_info(nullptr, sizeof(float), "f", 1))));
+        list.append(py::bool_(py::detail::compare_buffer_info<unsigned>::compare(py::buffer_info(nullptr, sizeof(int), "I", 1))));
+        list.append(py::bool_(py::detail::compare_buffer_info<long>::compare(py::buffer_info(nullptr, sizeof(long), "l", 1))));
+        list.append(py::bool_(py::detail::compare_buffer_info<long>::compare(py::buffer_info(nullptr, sizeof(long), sizeof(long) == sizeof(int) ? "i" : "q", 1))));
+        list.append(py::bool_(py::detail::compare_buffer_info<CompareStruct>::compare(py::buffer_info(nullptr, sizeof(CompareStruct), "T{?:x:3xI:y:f:z:}", 1))));
+        return list;
+    });
+    m.def("buffer_to_dtype", [](py::buffer& buf) { return py::dtype(buf.request()); });
+
+    // test_scalar_conversion
+    m.def("f_simple", [](SimpleStruct s) { return s.uint_ * 10; });
+    m.def("f_packed", [](PackedStruct s) { return s.uint_ * 10; });
+    m.def("f_nested", [](NestedStruct s) { return s.a.uint_ * 10; });
+
+    // test_register_dtype
+    m.def("register_dtype", []() { PYBIND11_NUMPY_DTYPE(SimpleStruct, bool_, uint_, float_, ldbl_); });
+
+    // test_str_leak
+    m.def("dtype_wrapper", [](py::object d) { return py::dtype::from_args(std::move(d)); });
+}
diff --git a/3rdparty/pybind11/tests/test_numpy_dtypes.py b/3rdparty/pybind11/tests/test_numpy_dtypes.py
new file mode 100644
index 00000000..2e638851
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_numpy_dtypes.py
@@ -0,0 +1,310 @@
+import re
+import pytest
+from pybind11_tests import numpy_dtypes as m
+
+pytestmark = pytest.requires_numpy
+
+with pytest.suppress(ImportError):
+    import numpy as np
+
+
+@pytest.fixture(scope='module')
+def simple_dtype():
+    ld = np.dtype('longdouble')
+    return np.dtype({'names': ['bool_', 'uint_', 'float_', 'ldbl_'],
+                     'formats': ['?', 'u4', 'f4', 'f{}'.format(ld.itemsize)],
+                     'offsets': [0, 4, 8, (16 if ld.alignment > 4 else 12)]})
+
+
+@pytest.fixture(scope='module')
+def packed_dtype():
+    return np.dtype([('bool_', '?'), ('uint_', 'u4'), ('float_', 'f4'), ('ldbl_', 'g')])
+
+
+def dt_fmt():
+    from sys import byteorder
+    e = '<' if byteorder == 'little' else '>'
+    return ("{{'names':['bool_','uint_','float_','ldbl_'],"
+            " 'formats':['?','" + e + "u4','" + e + "f4','" + e + "f{}'],"
+            " 'offsets':[0,4,8,{}], 'itemsize':{}}}")
+
+
+def simple_dtype_fmt():
+    ld = np.dtype('longdouble')
+    simple_ld_off = 12 + 4 * (ld.alignment > 4)
+    return dt_fmt().format(ld.itemsize, simple_ld_off, simple_ld_off + ld.itemsize)
+
+
+def packed_dtype_fmt():
+    from sys import byteorder
+    return "[('bool_', '?'), ('uint_', '{e}u4'), ('float_', '{e}f4'), ('ldbl_', '{e}f{}')]".format(
+        np.dtype('longdouble').itemsize, e='<' if byteorder == 'little' else '>')
+
+
+def partial_ld_offset():
+    return 12 + 4 * (np.dtype('uint64').alignment > 4) + 8 + 8 * (
+        np.dtype('longdouble').alignment > 8)
+
+
+def partial_dtype_fmt():
+    ld = np.dtype('longdouble')
+    partial_ld_off = partial_ld_offset()
+    return dt_fmt().format(ld.itemsize, partial_ld_off, partial_ld_off + ld.itemsize)
+
+
+def partial_nested_fmt():
+    ld = np.dtype('longdouble')
+    partial_nested_off = 8 + 8 * (ld.alignment > 8)
+    partial_ld_off = partial_ld_offset()
+    partial_nested_size = partial_nested_off * 2 + partial_ld_off + ld.itemsize
+    return "{{'names':['a'], 'formats':[{}], 'offsets':[{}], 'itemsize':{}}}".format(
+        partial_dtype_fmt(), partial_nested_off, partial_nested_size)
+
+
+def assert_equal(actual, expected_data, expected_dtype):
+    np.testing.assert_equal(actual, np.array(expected_data, dtype=expected_dtype))
+
+
+def test_format_descriptors():
+    with pytest.raises(RuntimeError) as excinfo:
+        m.get_format_unbound()
+    assert re.match('^NumPy type info missing for .*UnboundStruct.*$', str(excinfo.value))
+
+    ld = np.dtype('longdouble')
+    ldbl_fmt = ('4x' if ld.alignment > 4 else '') + ld.char
+    ss_fmt = "^T{?:bool_:3xI:uint_:f:float_:" + ldbl_fmt + ":ldbl_:}"
+    dbl = np.dtype('double')
+    partial_fmt = ("^T{?:bool_:3xI:uint_:f:float_:" +
+                   str(4 * (dbl.alignment > 4) + dbl.itemsize + 8 * (ld.alignment > 8)) +
+                   "xg:ldbl_:}")
+    nested_extra = str(max(8, ld.alignment))
+    assert m.print_format_descriptors() == [
+        ss_fmt,
+        "^T{?:bool_:I:uint_:f:float_:g:ldbl_:}",
+        "^T{" + ss_fmt + ":a:^T{?:bool_:I:uint_:f:float_:g:ldbl_:}:b:}",
+        partial_fmt,
+        "^T{" + nested_extra + "x" + partial_fmt + ":a:" + nested_extra + "x}",
+        "^T{3s:a:3s:b:}",
+        "^T{(3)4s:a:(2)i:b:(3)B:c:1x(4, 2)f:d:}",
+        '^T{q:e1:B:e2:}',
+        '^T{Zf:cflt:Zd:cdbl:}'
+    ]
+
+
+def test_dtype(simple_dtype):
+    from sys import byteorder
+    e = '<' if byteorder == 'little' else '>'
+
+    assert m.print_dtypes() == [
+        simple_dtype_fmt(),
+        packed_dtype_fmt(),
+        "[('a', {}), ('b', {})]".format(simple_dtype_fmt(), packed_dtype_fmt()),
+        partial_dtype_fmt(),
+        partial_nested_fmt(),
+        "[('a', 'S3'), ('b', 'S3')]",
+        ("{{'names':['a','b','c','d'], " +
+         "'formats':[('S4', (3,)),('" + e + "i4', (2,)),('u1', (3,)),('" + e + "f4', (4, 2))], " +
+         "'offsets':[0,12,20,24], 'itemsize':56}}").format(e=e),
+        "[('e1', '" + e + "i8'), ('e2', 'u1')]",
+        "[('x', 'i1'), ('y', '" + e + "u8')]",
+        "[('cflt', '" + e + "c8'), ('cdbl', '" + e + "c16')]"
+    ]
+
+    d1 = np.dtype({'names': ['a', 'b'], 'formats': ['int32', 'float64'],
+                   'offsets': [1, 10], 'itemsize': 20})
+    d2 = np.dtype([('a', 'i4'), ('b', 'f4')])
+    assert m.test_dtype_ctors() == [np.dtype('int32'), np.dtype('float64'),
+                                    np.dtype('bool'), d1, d1, np.dtype('uint32'), d2]
+
+    assert m.test_dtype_methods() == [np.dtype('int32'), simple_dtype, False, True,
+                                      np.dtype('int32').itemsize, simple_dtype.itemsize]
+
+    assert m.trailing_padding_dtype() == m.buffer_to_dtype(np.zeros(1, m.trailing_padding_dtype()))
+
+
+def test_recarray(simple_dtype, packed_dtype):
+    elements = [(False, 0, 0.0, -0.0), (True, 1, 1.5, -2.5), (False, 2, 3.0, -5.0)]
+
+    for func, dtype in [(m.create_rec_simple, simple_dtype), (m.create_rec_packed, packed_dtype)]:
+        arr = func(0)
+        assert arr.dtype == dtype
+        assert_equal(arr, [], simple_dtype)
+        assert_equal(arr, [], packed_dtype)
+
+        arr = func(3)
+        assert arr.dtype == dtype
+        assert_equal(arr, elements, simple_dtype)
+        assert_equal(arr, elements, packed_dtype)
+
+        if dtype == simple_dtype:
+            assert m.print_rec_simple(arr) == [
+                "s:0,0,0,-0",
+                "s:1,1,1.5,-2.5",
+                "s:0,2,3,-5"
+            ]
+        else:
+            assert m.print_rec_packed(arr) == [
+                "p:0,0,0,-0",
+                "p:1,1,1.5,-2.5",
+                "p:0,2,3,-5"
+            ]
+
+    nested_dtype = np.dtype([('a', simple_dtype), ('b', packed_dtype)])
+
+    arr = m.create_rec_nested(0)
+    assert arr.dtype == nested_dtype
+    assert_equal(arr, [], nested_dtype)
+
+    arr = m.create_rec_nested(3)
+    assert arr.dtype == nested_dtype
+    assert_equal(arr, [((False, 0, 0.0, -0.0), (True, 1, 1.5, -2.5)),
+                       ((True, 1, 1.5, -2.5), (False, 2, 3.0, -5.0)),
+                       ((False, 2, 3.0, -5.0), (True, 3, 4.5, -7.5))], nested_dtype)
+    assert m.print_rec_nested(arr) == [
+        "n:a=s:0,0,0,-0;b=p:1,1,1.5,-2.5",
+        "n:a=s:1,1,1.5,-2.5;b=p:0,2,3,-5",
+        "n:a=s:0,2,3,-5;b=p:1,3,4.5,-7.5"
+    ]
+
+    arr = m.create_rec_partial(3)
+    assert str(arr.dtype) == partial_dtype_fmt()
+    partial_dtype = arr.dtype
+    assert '' not in arr.dtype.fields
+    assert partial_dtype.itemsize > simple_dtype.itemsize
+    assert_equal(arr, elements, simple_dtype)
+    assert_equal(arr, elements, packed_dtype)
+
+    arr = m.create_rec_partial_nested(3)
+    assert str(arr.dtype) == partial_nested_fmt()
+    assert '' not in arr.dtype.fields
+    assert '' not in arr.dtype.fields['a'][0].fields
+    assert arr.dtype.itemsize > partial_dtype.itemsize
+    np.testing.assert_equal(arr['a'], m.create_rec_partial(3))
+
+
+def test_array_constructors():
+    data = np.arange(1, 7, dtype='int32')
+    for i in range(8):
+        np.testing.assert_array_equal(m.test_array_ctors(10 + i), data.reshape((3, 2)))
+        np.testing.assert_array_equal(m.test_array_ctors(20 + i), data.reshape((3, 2)))
+    for i in range(5):
+        np.testing.assert_array_equal(m.test_array_ctors(30 + i), data)
+        np.testing.assert_array_equal(m.test_array_ctors(40 + i), data)
+
+
+def test_string_array():
+    arr = m.create_string_array(True)
+    assert str(arr.dtype) == "[('a', 'S3'), ('b', 'S3')]"
+    assert m.print_string_array(arr) == [
+        "a='',b=''",
+        "a='a',b='a'",
+        "a='ab',b='ab'",
+        "a='abc',b='abc'"
+    ]
+    dtype = arr.dtype
+    assert arr['a'].tolist() == [b'', b'a', b'ab', b'abc']
+    assert arr['b'].tolist() == [b'', b'a', b'ab', b'abc']
+    arr = m.create_string_array(False)
+    assert dtype == arr.dtype
+
+
+def test_array_array():
+    from sys import byteorder
+    e = '<' if byteorder == 'little' else '>'
+
+    arr = m.create_array_array(3)
+    assert str(arr.dtype) == (
+        "{{'names':['a','b','c','d'], " +
+        "'formats':[('S4', (3,)),('" + e + "i4', (2,)),('u1', (3,)),('{e}f4', (4, 2))], " +
+        "'offsets':[0,12,20,24], 'itemsize':56}}").format(e=e)
+    assert m.print_array_array(arr) == [
+        "a={{A,B,C,D},{K,L,M,N},{U,V,W,X}},b={0,1}," +
+        "c={0,1,2},d={{0,1},{10,11},{20,21},{30,31}}",
+        "a={{W,X,Y,Z},{G,H,I,J},{Q,R,S,T}},b={1000,1001}," +
+        "c={10,11,12},d={{100,101},{110,111},{120,121},{130,131}}",
+        "a={{S,T,U,V},{C,D,E,F},{M,N,O,P}},b={2000,2001}," +
+        "c={20,21,22},d={{200,201},{210,211},{220,221},{230,231}}",
+    ]
+    assert arr['a'].tolist() == [[b'ABCD', b'KLMN', b'UVWX'],
+                                 [b'WXYZ', b'GHIJ', b'QRST'],
+                                 [b'STUV', b'CDEF', b'MNOP']]
+    assert arr['b'].tolist() == [[0, 1], [1000, 1001], [2000, 2001]]
+    assert m.create_array_array(0).dtype == arr.dtype
+
+
+def test_enum_array():
+    from sys import byteorder
+    e = '<' if byteorder == 'little' else '>'
+
+    arr = m.create_enum_array(3)
+    dtype = arr.dtype
+    assert dtype == np.dtype([('e1', e + 'i8'), ('e2', 'u1')])
+    assert m.print_enum_array(arr) == [
+        "e1=A,e2=X",
+        "e1=B,e2=Y",
+        "e1=A,e2=X"
+    ]
+    assert arr['e1'].tolist() == [-1, 1, -1]
+    assert arr['e2'].tolist() == [1, 2, 1]
+    assert m.create_enum_array(0).dtype == dtype
+
+
+def test_complex_array():
+    from sys import byteorder
+    e = '<' if byteorder == 'little' else '>'
+
+    arr = m.create_complex_array(3)
+    dtype = arr.dtype
+    assert dtype == np.dtype([('cflt', e + 'c8'), ('cdbl', e + 'c16')])
+    assert m.print_complex_array(arr) == [
+        "c:(0,0.25),(0.5,0.75)",
+        "c:(1,1.25),(1.5,1.75)",
+        "c:(2,2.25),(2.5,2.75)"
+    ]
+    assert arr['cflt'].tolist() == [0.0 + 0.25j, 1.0 + 1.25j, 2.0 + 2.25j]
+    assert arr['cdbl'].tolist() == [0.5 + 0.75j, 1.5 + 1.75j, 2.5 + 2.75j]
+    assert m.create_complex_array(0).dtype == dtype
+
+
+def test_signature(doc):
+    assert doc(m.create_rec_nested) == \
+        "create_rec_nested(arg0: int) -> numpy.ndarray[NestedStruct]"
+
+
+def test_scalar_conversion():
+    n = 3
+    arrays = [m.create_rec_simple(n), m.create_rec_packed(n),
+              m.create_rec_nested(n), m.create_enum_array(n)]
+    funcs = [m.f_simple, m.f_packed, m.f_nested]
+
+    for i, func in enumerate(funcs):
+        for j, arr in enumerate(arrays):
+            if i == j and i < 2:
+                assert [func(arr[k]) for k in range(n)] == [k * 10 for k in range(n)]
+            else:
+                with pytest.raises(TypeError) as excinfo:
+                    func(arr[0])
+                assert 'incompatible function arguments' in str(excinfo.value)
+
+
+def test_register_dtype():
+    with pytest.raises(RuntimeError) as excinfo:
+        m.register_dtype()
+    assert 'dtype is already registered' in str(excinfo.value)
+
+
+@pytest.unsupported_on_pypy
+def test_str_leak():
+    from sys import getrefcount
+    fmt = "f4"
+    pytest.gc_collect()
+    start = getrefcount(fmt)
+    d = m.dtype_wrapper(fmt)
+    assert d is np.dtype("f4")
+    del d
+    pytest.gc_collect()
+    assert getrefcount(fmt) == start
+
+
+def test_compare_buffer_info():
+    assert all(m.compare_buffer_info())
diff --git a/3rdparty/pybind11/tests/test_numpy_vectorize.cpp b/3rdparty/pybind11/tests/test_numpy_vectorize.cpp
new file mode 100644
index 00000000..a875a74b
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_numpy_vectorize.cpp
@@ -0,0 +1,89 @@
+/*
+    tests/test_numpy_vectorize.cpp -- auto-vectorize functions over NumPy array
+    arguments
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/numpy.h>
+
+double my_func(int x, float y, double z) {
+    py::print("my_func(x:int={}, y:float={:.0f}, z:float={:.0f})"_s.format(x, y, z));
+    return (float) x*y*z;
+}
+
+TEST_SUBMODULE(numpy_vectorize, m) {
+    try { py::module::import("numpy"); }
+    catch (...) { return; }
+
+    // test_vectorize, test_docs, test_array_collapse
+    // Vectorize all arguments of a function (though non-vector arguments are also allowed)
+    m.def("vectorized_func", py::vectorize(my_func));
+
+    // Vectorize a lambda function with a capture object (e.g. to exclude some arguments from the vectorization)
+    m.def("vectorized_func2",
+        [](py::array_t<int> x, py::array_t<float> y, float z) {
+            return py::vectorize([z](int x, float y) { return my_func(x, y, z); })(x, y);
+        }
+    );
+
+    // Vectorize a complex-valued function
+    m.def("vectorized_func3", py::vectorize(
+        [](std::complex<double> c) { return c * std::complex<double>(2.f); }
+    ));
+
+    // test_type_selection
+    // Numpy function which only accepts specific data types
+    m.def("selective_func", [](py::array_t<int, py::array::c_style>) { return "Int branch taken."; });
+    m.def("selective_func", [](py::array_t<float, py::array::c_style>) { return "Float branch taken."; });
+    m.def("selective_func", [](py::array_t<std::complex<float>, py::array::c_style>) { return "Complex float branch taken."; });
+
+
+    // test_passthrough_arguments
+    // Passthrough test: references and non-pod types should be automatically passed through (in the
+    // function definition below, only `b`, `d`, and `g` are vectorized):
+    struct NonPODClass {
+        NonPODClass(int v) : value{v} {}
+        int value;
+    };
+    py::class_<NonPODClass>(m, "NonPODClass").def(py::init<int>());
+    m.def("vec_passthrough", py::vectorize(
+        [](double *a, double b, py::array_t<double> c, const int &d, int &e, NonPODClass f, const double g) {
+            return *a + b + c.at(0) + d + e + f.value + g;
+        }
+    ));
+
+    // test_method_vectorization
+    struct VectorizeTestClass {
+        VectorizeTestClass(int v) : value{v} {};
+        float method(int x, float y) { return y + (float) (x + value); }
+        int value = 0;
+    };
+    py::class_<VectorizeTestClass> vtc(m, "VectorizeTestClass");
+    vtc .def(py::init<int>())
+        .def_readwrite("value", &VectorizeTestClass::value);
+
+    // Automatic vectorizing of methods
+    vtc.def("method", py::vectorize(&VectorizeTestClass::method));
+
+    // test_trivial_broadcasting
+    // Internal optimization test for whether the input is trivially broadcastable:
+    py::enum_<py::detail::broadcast_trivial>(m, "trivial")
+        .value("f_trivial", py::detail::broadcast_trivial::f_trivial)
+        .value("c_trivial", py::detail::broadcast_trivial::c_trivial)
+        .value("non_trivial", py::detail::broadcast_trivial::non_trivial);
+    m.def("vectorized_is_trivial", [](
+                py::array_t<int, py::array::forcecast> arg1,
+                py::array_t<float, py::array::forcecast> arg2,
+                py::array_t<double, py::array::forcecast> arg3
+                ) {
+        ssize_t ndim;
+        std::vector<ssize_t> shape;
+        std::array<py::buffer_info, 3> buffers {{ arg1.request(), arg2.request(), arg3.request() }};
+        return py::detail::broadcast(buffers, ndim, shape);
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_numpy_vectorize.py b/3rdparty/pybind11/tests/test_numpy_vectorize.py
new file mode 100644
index 00000000..0e9c8839
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_numpy_vectorize.py
@@ -0,0 +1,196 @@
+import pytest
+from pybind11_tests import numpy_vectorize as m
+
+pytestmark = pytest.requires_numpy
+
+with pytest.suppress(ImportError):
+    import numpy as np
+
+
+def test_vectorize(capture):
+    assert np.isclose(m.vectorized_func3(np.array(3 + 7j)), [6 + 14j])
+
+    for f in [m.vectorized_func, m.vectorized_func2]:
+        with capture:
+            assert np.isclose(f(1, 2, 3), 6)
+        assert capture == "my_func(x:int=1, y:float=2, z:float=3)"
+        with capture:
+            assert np.isclose(f(np.array(1), np.array(2), 3), 6)
+        assert capture == "my_func(x:int=1, y:float=2, z:float=3)"
+        with capture:
+            assert np.allclose(f(np.array([1, 3]), np.array([2, 4]), 3), [6, 36])
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=3)
+            my_func(x:int=3, y:float=4, z:float=3)
+        """
+        with capture:
+            a = np.array([[1, 2], [3, 4]], order='F')
+            b = np.array([[10, 20], [30, 40]], order='F')
+            c = 3
+            result = f(a, b, c)
+            assert np.allclose(result, a * b * c)
+            assert result.flags.f_contiguous
+        # All inputs are F order and full or singletons, so we the result is in col-major order:
+        assert capture == """
+            my_func(x:int=1, y:float=10, z:float=3)
+            my_func(x:int=3, y:float=30, z:float=3)
+            my_func(x:int=2, y:float=20, z:float=3)
+            my_func(x:int=4, y:float=40, z:float=3)
+        """
+        with capture:
+            a, b, c = np.array([[1, 3, 5], [7, 9, 11]]), np.array([[2, 4, 6], [8, 10, 12]]), 3
+            assert np.allclose(f(a, b, c), a * b * c)
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=3)
+            my_func(x:int=3, y:float=4, z:float=3)
+            my_func(x:int=5, y:float=6, z:float=3)
+            my_func(x:int=7, y:float=8, z:float=3)
+            my_func(x:int=9, y:float=10, z:float=3)
+            my_func(x:int=11, y:float=12, z:float=3)
+        """
+        with capture:
+            a, b, c = np.array([[1, 2, 3], [4, 5, 6]]), np.array([2, 3, 4]), 2
+            assert np.allclose(f(a, b, c), a * b * c)
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=2)
+            my_func(x:int=2, y:float=3, z:float=2)
+            my_func(x:int=3, y:float=4, z:float=2)
+            my_func(x:int=4, y:float=2, z:float=2)
+            my_func(x:int=5, y:float=3, z:float=2)
+            my_func(x:int=6, y:float=4, z:float=2)
+        """
+        with capture:
+            a, b, c = np.array([[1, 2, 3], [4, 5, 6]]), np.array([[2], [3]]), 2
+            assert np.allclose(f(a, b, c), a * b * c)
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=2)
+            my_func(x:int=2, y:float=2, z:float=2)
+            my_func(x:int=3, y:float=2, z:float=2)
+            my_func(x:int=4, y:float=3, z:float=2)
+            my_func(x:int=5, y:float=3, z:float=2)
+            my_func(x:int=6, y:float=3, z:float=2)
+        """
+        with capture:
+            a, b, c = np.array([[1, 2, 3], [4, 5, 6]], order='F'), np.array([[2], [3]]), 2
+            assert np.allclose(f(a, b, c), a * b * c)
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=2)
+            my_func(x:int=2, y:float=2, z:float=2)
+            my_func(x:int=3, y:float=2, z:float=2)
+            my_func(x:int=4, y:float=3, z:float=2)
+            my_func(x:int=5, y:float=3, z:float=2)
+            my_func(x:int=6, y:float=3, z:float=2)
+        """
+        with capture:
+            a, b, c = np.array([[1, 2, 3], [4, 5, 6]])[::, ::2], np.array([[2], [3]]), 2
+            assert np.allclose(f(a, b, c), a * b * c)
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=2)
+            my_func(x:int=3, y:float=2, z:float=2)
+            my_func(x:int=4, y:float=3, z:float=2)
+            my_func(x:int=6, y:float=3, z:float=2)
+        """
+        with capture:
+            a, b, c = np.array([[1, 2, 3], [4, 5, 6]], order='F')[::, ::2], np.array([[2], [3]]), 2
+            assert np.allclose(f(a, b, c), a * b * c)
+        assert capture == """
+            my_func(x:int=1, y:float=2, z:float=2)
+            my_func(x:int=3, y:float=2, z:float=2)
+            my_func(x:int=4, y:float=3, z:float=2)
+            my_func(x:int=6, y:float=3, z:float=2)
+        """
+
+
+def test_type_selection():
+    assert m.selective_func(np.array([1], dtype=np.int32)) == "Int branch taken."
+    assert m.selective_func(np.array([1.0], dtype=np.float32)) == "Float branch taken."
+    assert m.selective_func(np.array([1.0j], dtype=np.complex64)) == "Complex float branch taken."
+
+
+def test_docs(doc):
+    assert doc(m.vectorized_func) == """
+        vectorized_func(arg0: numpy.ndarray[int32], arg1: numpy.ndarray[float32], arg2: numpy.ndarray[float64]) -> object
+    """  # noqa: E501 line too long
+
+
+def test_trivial_broadcasting():
+    trivial, vectorized_is_trivial = m.trivial, m.vectorized_is_trivial
+
+    assert vectorized_is_trivial(1, 2, 3) == trivial.c_trivial
+    assert vectorized_is_trivial(np.array(1), np.array(2), 3) == trivial.c_trivial
+    assert vectorized_is_trivial(np.array([1, 3]), np.array([2, 4]), 3) == trivial.c_trivial
+    assert trivial.c_trivial == vectorized_is_trivial(
+        np.array([[1, 3, 5], [7, 9, 11]]), np.array([[2, 4, 6], [8, 10, 12]]), 3)
+    assert vectorized_is_trivial(
+        np.array([[1, 2, 3], [4, 5, 6]]), np.array([2, 3, 4]), 2) == trivial.non_trivial
+    assert vectorized_is_trivial(
+        np.array([[1, 2, 3], [4, 5, 6]]), np.array([[2], [3]]), 2) == trivial.non_trivial
+    z1 = np.array([[1, 2, 3, 4], [5, 6, 7, 8]], dtype='int32')
+    z2 = np.array(z1, dtype='float32')
+    z3 = np.array(z1, dtype='float64')
+    assert vectorized_is_trivial(z1, z2, z3) == trivial.c_trivial
+    assert vectorized_is_trivial(1, z2, z3) == trivial.c_trivial
+    assert vectorized_is_trivial(z1, 1, z3) == trivial.c_trivial
+    assert vectorized_is_trivial(z1, z2, 1) == trivial.c_trivial
+    assert vectorized_is_trivial(z1[::2, ::2], 1, 1) == trivial.non_trivial
+    assert vectorized_is_trivial(1, 1, z1[::2, ::2]) == trivial.c_trivial
+    assert vectorized_is_trivial(1, 1, z3[::2, ::2]) == trivial.non_trivial
+    assert vectorized_is_trivial(z1, 1, z3[1::4, 1::4]) == trivial.c_trivial
+
+    y1 = np.array(z1, order='F')
+    y2 = np.array(y1)
+    y3 = np.array(y1)
+    assert vectorized_is_trivial(y1, y2, y3) == trivial.f_trivial
+    assert vectorized_is_trivial(y1, 1, 1) == trivial.f_trivial
+    assert vectorized_is_trivial(1, y2, 1) == trivial.f_trivial
+    assert vectorized_is_trivial(1, 1, y3) == trivial.f_trivial
+    assert vectorized_is_trivial(y1, z2, 1) == trivial.non_trivial
+    assert vectorized_is_trivial(z1[1::4, 1::4], y2, 1) == trivial.f_trivial
+    assert vectorized_is_trivial(y1[1::4, 1::4], z2, 1) == trivial.c_trivial
+
+    assert m.vectorized_func(z1, z2, z3).flags.c_contiguous
+    assert m.vectorized_func(y1, y2, y3).flags.f_contiguous
+    assert m.vectorized_func(z1, 1, 1).flags.c_contiguous
+    assert m.vectorized_func(1, y2, 1).flags.f_contiguous
+    assert m.vectorized_func(z1[1::4, 1::4], y2, 1).flags.f_contiguous
+    assert m.vectorized_func(y1[1::4, 1::4], z2, 1).flags.c_contiguous
+
+
+def test_passthrough_arguments(doc):
+    assert doc(m.vec_passthrough) == (
+        "vec_passthrough(" + ", ".join([
+            "arg0: float",
+            "arg1: numpy.ndarray[float64]",
+            "arg2: numpy.ndarray[float64]",
+            "arg3: numpy.ndarray[int32]",
+            "arg4: int",
+            "arg5: m.numpy_vectorize.NonPODClass",
+            "arg6: numpy.ndarray[float64]"]) + ") -> object")
+
+    b = np.array([[10, 20, 30]], dtype='float64')
+    c = np.array([100, 200])  # NOT a vectorized argument
+    d = np.array([[1000], [2000], [3000]], dtype='int')
+    g = np.array([[1000000, 2000000, 3000000]], dtype='int')  # requires casting
+    assert np.all(
+        m.vec_passthrough(1, b, c, d, 10000, m.NonPODClass(100000), g) ==
+        np.array([[1111111, 2111121, 3111131],
+                  [1112111, 2112121, 3112131],
+                  [1113111, 2113121, 3113131]]))
+
+
+def test_method_vectorization():
+    o = m.VectorizeTestClass(3)
+    x = np.array([1, 2], dtype='int')
+    y = np.array([[10], [20]], dtype='float32')
+    assert np.all(o.method(x, y) == [[14, 15], [24, 25]])
+
+
+def test_array_collapse():
+    assert not isinstance(m.vectorized_func(1, 2, 3), np.ndarray)
+    assert not isinstance(m.vectorized_func(np.array(1), 2, 3), np.ndarray)
+    z = m.vectorized_func([1], 2, 3)
+    assert isinstance(z, np.ndarray)
+    assert z.shape == (1, )
+    z = m.vectorized_func(1, [[[2]]], 3)
+    assert isinstance(z, np.ndarray)
+    assert z.shape == (1, 1, 1)
diff --git a/3rdparty/pybind11/tests/test_opaque_types.cpp b/3rdparty/pybind11/tests/test_opaque_types.cpp
new file mode 100644
index 00000000..0d20d9a0
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_opaque_types.cpp
@@ -0,0 +1,67 @@
+/*
+    tests/test_opaque_types.cpp -- opaque types, passing void pointers
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/stl.h>
+#include <vector>
+
+// IMPORTANT: Disable internal pybind11 translation mechanisms for STL data structures
+//
+// This also deliberately doesn't use the below StringList type alias to test
+// that MAKE_OPAQUE can handle a type containing a `,`.  (The `std::allocator`
+// bit is just the default `std::vector` allocator).
+PYBIND11_MAKE_OPAQUE(std::vector<std::string, std::allocator<std::string>>);
+
+using StringList = std::vector<std::string, std::allocator<std::string>>;
+
+TEST_SUBMODULE(opaque_types, m) {
+    // test_string_list
+    py::class_<StringList>(m, "StringList")
+        .def(py::init<>())
+        .def("pop_back", &StringList::pop_back)
+        /* There are multiple versions of push_back(), etc. Select the right ones. */
+        .def("push_back", (void (StringList::*)(const std::string &)) &StringList::push_back)
+        .def("back", (std::string &(StringList::*)()) &StringList::back)
+        .def("__len__", [](const StringList &v) { return v.size(); })
+        .def("__iter__", [](StringList &v) {
+           return py::make_iterator(v.begin(), v.end());
+        }, py::keep_alive<0, 1>());
+
+    class ClassWithSTLVecProperty {
+    public:
+        StringList stringList;
+    };
+    py::class_<ClassWithSTLVecProperty>(m, "ClassWithSTLVecProperty")
+        .def(py::init<>())
+        .def_readwrite("stringList", &ClassWithSTLVecProperty::stringList);
+
+    m.def("print_opaque_list", [](const StringList &l) {
+        std::string ret = "Opaque list: [";
+        bool first = true;
+        for (auto entry : l) {
+            if (!first)
+                ret += ", ";
+            ret += entry;
+            first = false;
+        }
+        return ret + "]";
+    });
+
+    // test_pointers
+    m.def("return_void_ptr", []() { return (void *) 0x1234; });
+    m.def("get_void_ptr_value", [](void *ptr) { return reinterpret_cast<std::intptr_t>(ptr); });
+    m.def("return_null_str", []() { return (char *) nullptr; });
+    m.def("get_null_str_value", [](char *ptr) { return reinterpret_cast<std::intptr_t>(ptr); });
+
+    m.def("return_unique_ptr", []() -> std::unique_ptr<StringList> {
+        StringList *result = new StringList();
+        result->push_back("some value");
+        return std::unique_ptr<StringList>(result);
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_opaque_types.py b/3rdparty/pybind11/tests/test_opaque_types.py
new file mode 100644
index 00000000..6b3802fd
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_opaque_types.py
@@ -0,0 +1,46 @@
+import pytest
+from pybind11_tests import opaque_types as m
+from pybind11_tests import ConstructorStats, UserType
+
+
+def test_string_list():
+    lst = m.StringList()
+    lst.push_back("Element 1")
+    lst.push_back("Element 2")
+    assert m.print_opaque_list(lst) == "Opaque list: [Element 1, Element 2]"
+    assert lst.back() == "Element 2"
+
+    for i, k in enumerate(lst, start=1):
+        assert k == "Element {}".format(i)
+    lst.pop_back()
+    assert m.print_opaque_list(lst) == "Opaque list: [Element 1]"
+
+    cvp = m.ClassWithSTLVecProperty()
+    assert m.print_opaque_list(cvp.stringList) == "Opaque list: []"
+
+    cvp.stringList = lst
+    cvp.stringList.push_back("Element 3")
+    assert m.print_opaque_list(cvp.stringList) == "Opaque list: [Element 1, Element 3]"
+
+
+def test_pointers(msg):
+    living_before = ConstructorStats.get(UserType).alive()
+    assert m.get_void_ptr_value(m.return_void_ptr()) == 0x1234
+    assert m.get_void_ptr_value(UserType())  # Should also work for other C++ types
+    assert ConstructorStats.get(UserType).alive() == living_before
+
+    with pytest.raises(TypeError) as excinfo:
+        m.get_void_ptr_value([1, 2, 3])  # This should not work
+    assert msg(excinfo.value) == """
+        get_void_ptr_value(): incompatible function arguments. The following argument types are supported:
+            1. (arg0: capsule) -> int
+
+        Invoked with: [1, 2, 3]
+    """  # noqa: E501 line too long
+
+    assert m.return_null_str() is None
+    assert m.get_null_str_value(m.return_null_str()) is not None
+
+    ptr = m.return_unique_ptr()
+    assert "StringList" in repr(ptr)
+    assert m.print_opaque_list(ptr) == "Opaque list: [some value]"
diff --git a/3rdparty/pybind11/tests/test_operator_overloading.cpp b/3rdparty/pybind11/tests/test_operator_overloading.cpp
new file mode 100644
index 00000000..7b111704
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_operator_overloading.cpp
@@ -0,0 +1,171 @@
+/*
+    tests/test_operator_overloading.cpp -- operator overloading
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/operators.h>
+#include <functional>
+
+class Vector2 {
+public:
+    Vector2(float x, float y) : x(x), y(y) { print_created(this, toString()); }
+    Vector2(const Vector2 &v) : x(v.x), y(v.y) { print_copy_created(this); }
+    Vector2(Vector2 &&v) : x(v.x), y(v.y) { print_move_created(this); v.x = v.y = 0; }
+    Vector2 &operator=(const Vector2 &v) { x = v.x; y = v.y; print_copy_assigned(this); return *this; }
+    Vector2 &operator=(Vector2 &&v) { x = v.x; y = v.y; v.x = v.y = 0; print_move_assigned(this); return *this; }
+    ~Vector2() { print_destroyed(this); }
+
+    std::string toString() const { return "[" + std::to_string(x) + ", " + std::to_string(y) + "]"; }
+
+    Vector2 operator-() const { return Vector2(-x, -y); }
+    Vector2 operator+(const Vector2 &v) const { return Vector2(x + v.x, y + v.y); }
+    Vector2 operator-(const Vector2 &v) const { return Vector2(x - v.x, y - v.y); }
+    Vector2 operator-(float value) const { return Vector2(x - value, y - value); }
+    Vector2 operator+(float value) const { return Vector2(x + value, y + value); }
+    Vector2 operator*(float value) const { return Vector2(x * value, y * value); }
+    Vector2 operator/(float value) const { return Vector2(x / value, y / value); }
+    Vector2 operator*(const Vector2 &v) const { return Vector2(x * v.x, y * v.y); }
+    Vector2 operator/(const Vector2 &v) const { return Vector2(x / v.x, y / v.y); }
+    Vector2& operator+=(const Vector2 &v) { x += v.x; y += v.y; return *this; }
+    Vector2& operator-=(const Vector2 &v) { x -= v.x; y -= v.y; return *this; }
+    Vector2& operator*=(float v) { x *= v; y *= v; return *this; }
+    Vector2& operator/=(float v) { x /= v; y /= v; return *this; }
+    Vector2& operator*=(const Vector2 &v) { x *= v.x; y *= v.y; return *this; }
+    Vector2& operator/=(const Vector2 &v) { x /= v.x; y /= v.y; return *this; }
+
+    friend Vector2 operator+(float f, const Vector2 &v) { return Vector2(f + v.x, f + v.y); }
+    friend Vector2 operator-(float f, const Vector2 &v) { return Vector2(f - v.x, f - v.y); }
+    friend Vector2 operator*(float f, const Vector2 &v) { return Vector2(f * v.x, f * v.y); }
+    friend Vector2 operator/(float f, const Vector2 &v) { return Vector2(f / v.x, f / v.y); }
+private:
+    float x, y;
+};
+
+class C1 { };
+class C2 { };
+
+int operator+(const C1 &, const C1 &) { return 11; }
+int operator+(const C2 &, const C2 &) { return 22; }
+int operator+(const C2 &, const C1 &) { return 21; }
+int operator+(const C1 &, const C2 &) { return 12; }
+
+namespace std {
+    template<>
+    struct hash<Vector2> {
+        // Not a good hash function, but easy to test
+        size_t operator()(const Vector2 &) { return 4; }
+    };
+}
+
+// MSVC warns about unknown pragmas, and warnings are errors.
+#ifndef _MSC_VER
+  #pragma GCC diagnostic push
+  // clang 7.0.0 and Apple LLVM 10.0.1 introduce `-Wself-assign-overloaded` to
+  // `-Wall`, which is used here for overloading (e.g. `py::self += py::self `).
+  // Here, we suppress the warning using `#pragma diagnostic`.
+  // Taken from: https://github.com/RobotLocomotion/drake/commit/aaf84b46
+  // TODO(eric): This could be resolved using a function / functor (e.g. `py::self()`).
+  #if (__APPLE__) && (__clang__)
+    #if (__clang_major__ >= 10) && (__clang_minor__ >= 0) && (__clang_patchlevel__ >= 1)
+      #pragma GCC diagnostic ignored "-Wself-assign-overloaded"
+    #endif
+  #elif (__clang__)
+    #if (__clang_major__ >= 7)
+      #pragma GCC diagnostic ignored "-Wself-assign-overloaded"
+    #endif
+  #endif
+#endif
+
+TEST_SUBMODULE(operators, m) {
+
+    // test_operator_overloading
+    py::class_<Vector2>(m, "Vector2")
+        .def(py::init<float, float>())
+        .def(py::self + py::self)
+        .def(py::self + float())
+        .def(py::self - py::self)
+        .def(py::self - float())
+        .def(py::self * float())
+        .def(py::self / float())
+        .def(py::self * py::self)
+        .def(py::self / py::self)
+        .def(py::self += py::self)
+        .def(py::self -= py::self)
+        .def(py::self *= float())
+        .def(py::self /= float())
+        .def(py::self *= py::self)
+        .def(py::self /= py::self)
+        .def(float() + py::self)
+        .def(float() - py::self)
+        .def(float() * py::self)
+        .def(float() / py::self)
+        .def(-py::self)
+        .def("__str__", &Vector2::toString)
+        .def(hash(py::self))
+        ;
+
+    m.attr("Vector") = m.attr("Vector2");
+
+    // test_operators_notimplemented
+    // #393: need to return NotSupported to ensure correct arithmetic operator behavior
+    py::class_<C1>(m, "C1")
+        .def(py::init<>())
+        .def(py::self + py::self);
+
+    py::class_<C2>(m, "C2")
+        .def(py::init<>())
+        .def(py::self + py::self)
+        .def("__add__", [](const C2& c2, const C1& c1) { return c2 + c1; })
+        .def("__radd__", [](const C2& c2, const C1& c1) { return c1 + c2; });
+
+    // test_nested
+    // #328: first member in a class can't be used in operators
+    struct NestABase { int value = -2; };
+    py::class_<NestABase>(m, "NestABase")
+        .def(py::init<>())
+        .def_readwrite("value", &NestABase::value);
+
+    struct NestA : NestABase {
+        int value = 3;
+        NestA& operator+=(int i) { value += i; return *this; }
+    };
+    py::class_<NestA>(m, "NestA")
+        .def(py::init<>())
+        .def(py::self += int())
+        .def("as_base", [](NestA &a) -> NestABase& {
+            return (NestABase&) a;
+        }, py::return_value_policy::reference_internal);
+    m.def("get_NestA", [](const NestA &a) { return a.value; });
+
+    struct NestB {
+        NestA a;
+        int value = 4;
+        NestB& operator-=(int i) { value -= i; return *this; }
+    };
+    py::class_<NestB>(m, "NestB")
+        .def(py::init<>())
+        .def(py::self -= int())
+        .def_readwrite("a", &NestB::a);
+    m.def("get_NestB", [](const NestB &b) { return b.value; });
+
+    struct NestC {
+        NestB b;
+        int value = 5;
+        NestC& operator*=(int i) { value *= i; return *this; }
+    };
+    py::class_<NestC>(m, "NestC")
+        .def(py::init<>())
+        .def(py::self *= int())
+        .def_readwrite("b", &NestC::b);
+    m.def("get_NestC", [](const NestC &c) { return c.value; });
+}
+
+#ifndef _MSC_VER
+  #pragma GCC diagnostic pop
+#endif
diff --git a/3rdparty/pybind11/tests/test_operator_overloading.py b/3rdparty/pybind11/tests/test_operator_overloading.py
new file mode 100644
index 00000000..bd36ac2a
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_operator_overloading.py
@@ -0,0 +1,108 @@
+import pytest
+from pybind11_tests import operators as m
+from pybind11_tests import ConstructorStats
+
+
+def test_operator_overloading():
+    v1 = m.Vector2(1, 2)
+    v2 = m.Vector(3, -1)
+    assert str(v1) == "[1.000000, 2.000000]"
+    assert str(v2) == "[3.000000, -1.000000]"
+
+    assert str(-v2) == "[-3.000000, 1.000000]"
+
+    assert str(v1 + v2) == "[4.000000, 1.000000]"
+    assert str(v1 - v2) == "[-2.000000, 3.000000]"
+    assert str(v1 - 8) == "[-7.000000, -6.000000]"
+    assert str(v1 + 8) == "[9.000000, 10.000000]"
+    assert str(v1 * 8) == "[8.000000, 16.000000]"
+    assert str(v1 / 8) == "[0.125000, 0.250000]"
+    assert str(8 - v1) == "[7.000000, 6.000000]"
+    assert str(8 + v1) == "[9.000000, 10.000000]"
+    assert str(8 * v1) == "[8.000000, 16.000000]"
+    assert str(8 / v1) == "[8.000000, 4.000000]"
+    assert str(v1 * v2) == "[3.000000, -2.000000]"
+    assert str(v2 / v1) == "[3.000000, -0.500000]"
+
+    v1 += 2 * v2
+    assert str(v1) == "[7.000000, 0.000000]"
+    v1 -= v2
+    assert str(v1) == "[4.000000, 1.000000]"
+    v1 *= 2
+    assert str(v1) == "[8.000000, 2.000000]"
+    v1 /= 16
+    assert str(v1) == "[0.500000, 0.125000]"
+    v1 *= v2
+    assert str(v1) == "[1.500000, -0.125000]"
+    v2 /= v1
+    assert str(v2) == "[2.000000, 8.000000]"
+
+    assert hash(v1) == 4
+
+    cstats = ConstructorStats.get(m.Vector2)
+    assert cstats.alive() == 2
+    del v1
+    assert cstats.alive() == 1
+    del v2
+    assert cstats.alive() == 0
+    assert cstats.values() == ['[1.000000, 2.000000]', '[3.000000, -1.000000]',
+                               '[-3.000000, 1.000000]', '[4.000000, 1.000000]',
+                               '[-2.000000, 3.000000]', '[-7.000000, -6.000000]',
+                               '[9.000000, 10.000000]', '[8.000000, 16.000000]',
+                               '[0.125000, 0.250000]', '[7.000000, 6.000000]',
+                               '[9.000000, 10.000000]', '[8.000000, 16.000000]',
+                               '[8.000000, 4.000000]', '[3.000000, -2.000000]',
+                               '[3.000000, -0.500000]', '[6.000000, -2.000000]']
+    assert cstats.default_constructions == 0
+    assert cstats.copy_constructions == 0
+    assert cstats.move_constructions >= 10
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+
+def test_operators_notimplemented():
+    """#393: need to return NotSupported to ensure correct arithmetic operator behavior"""
+
+    c1, c2 = m.C1(), m.C2()
+    assert c1 + c1 == 11
+    assert c2 + c2 == 22
+    assert c2 + c1 == 21
+    assert c1 + c2 == 12
+
+
+def test_nested():
+    """#328: first member in a class can't be used in operators"""
+
+    a = m.NestA()
+    b = m.NestB()
+    c = m.NestC()
+
+    a += 10
+    assert m.get_NestA(a) == 13
+    b.a += 100
+    assert m.get_NestA(b.a) == 103
+    c.b.a += 1000
+    assert m.get_NestA(c.b.a) == 1003
+    b -= 1
+    assert m.get_NestB(b) == 3
+    c.b -= 3
+    assert m.get_NestB(c.b) == 1
+    c *= 7
+    assert m.get_NestC(c) == 35
+
+    abase = a.as_base()
+    assert abase.value == -2
+    a.as_base().value += 44
+    assert abase.value == 42
+    assert c.b.a.as_base().value == -2
+    c.b.a.as_base().value += 44
+    assert c.b.a.as_base().value == 42
+
+    del c
+    pytest.gc_collect()
+    del a  # Shouldn't delete while abase is still alive
+    pytest.gc_collect()
+
+    assert abase.value == 42
+    del abase, b
+    pytest.gc_collect()
diff --git a/3rdparty/pybind11/tests/test_pickling.cpp b/3rdparty/pybind11/tests/test_pickling.cpp
new file mode 100644
index 00000000..9dc63bda
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_pickling.cpp
@@ -0,0 +1,130 @@
+/*
+    tests/test_pickling.cpp -- pickle support
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+TEST_SUBMODULE(pickling, m) {
+    // test_roundtrip
+    class Pickleable {
+    public:
+        Pickleable(const std::string &value) : m_value(value) { }
+        const std::string &value() const { return m_value; }
+
+        void setExtra1(int extra1) { m_extra1 = extra1; }
+        void setExtra2(int extra2) { m_extra2 = extra2; }
+        int extra1() const { return m_extra1; }
+        int extra2() const { return m_extra2; }
+    private:
+        std::string m_value;
+        int m_extra1 = 0;
+        int m_extra2 = 0;
+    };
+
+    class PickleableNew : public Pickleable {
+    public:
+        using Pickleable::Pickleable;
+    };
+
+    py::class_<Pickleable>(m, "Pickleable")
+        .def(py::init<std::string>())
+        .def("value", &Pickleable::value)
+        .def("extra1", &Pickleable::extra1)
+        .def("extra2", &Pickleable::extra2)
+        .def("setExtra1", &Pickleable::setExtra1)
+        .def("setExtra2", &Pickleable::setExtra2)
+        // For details on the methods below, refer to
+        // http://docs.python.org/3/library/pickle.html#pickling-class-instances
+        .def("__getstate__", [](const Pickleable &p) {
+            /* Return a tuple that fully encodes the state of the object */
+            return py::make_tuple(p.value(), p.extra1(), p.extra2());
+        })
+        .def("__setstate__", [](Pickleable &p, py::tuple t) {
+            if (t.size() != 3)
+                throw std::runtime_error("Invalid state!");
+            /* Invoke the constructor (need to use in-place version) */
+            new (&p) Pickleable(t[0].cast<std::string>());
+
+            /* Assign any additional state */
+            p.setExtra1(t[1].cast<int>());
+            p.setExtra2(t[2].cast<int>());
+        });
+
+    py::class_<PickleableNew, Pickleable>(m, "PickleableNew")
+        .def(py::init<std::string>())
+        .def(py::pickle(
+            [](const PickleableNew &p) {
+                return py::make_tuple(p.value(), p.extra1(), p.extra2());
+            },
+            [](py::tuple t) {
+                if (t.size() != 3)
+                    throw std::runtime_error("Invalid state!");
+                auto p = PickleableNew(t[0].cast<std::string>());
+
+                p.setExtra1(t[1].cast<int>());
+                p.setExtra2(t[2].cast<int>());
+                return p;
+            }
+        ));
+
+#if !defined(PYPY_VERSION)
+    // test_roundtrip_with_dict
+    class PickleableWithDict {
+    public:
+        PickleableWithDict(const std::string &value) : value(value) { }
+
+        std::string value;
+        int extra;
+    };
+
+    class PickleableWithDictNew : public PickleableWithDict {
+    public:
+        using PickleableWithDict::PickleableWithDict;
+    };
+
+    py::class_<PickleableWithDict>(m, "PickleableWithDict", py::dynamic_attr())
+        .def(py::init<std::string>())
+        .def_readwrite("value", &PickleableWithDict::value)
+        .def_readwrite("extra", &PickleableWithDict::extra)
+        .def("__getstate__", [](py::object self) {
+            /* Also include __dict__ in state */
+            return py::make_tuple(self.attr("value"), self.attr("extra"), self.attr("__dict__"));
+        })
+        .def("__setstate__", [](py::object self, py::tuple t) {
+            if (t.size() != 3)
+                throw std::runtime_error("Invalid state!");
+            /* Cast and construct */
+            auto& p = self.cast<PickleableWithDict&>();
+            new (&p) PickleableWithDict(t[0].cast<std::string>());
+
+            /* Assign C++ state */
+            p.extra = t[1].cast<int>();
+
+            /* Assign Python state */
+            self.attr("__dict__") = t[2];
+        });
+
+    py::class_<PickleableWithDictNew, PickleableWithDict>(m, "PickleableWithDictNew")
+        .def(py::init<std::string>())
+        .def(py::pickle(
+            [](py::object self) {
+                return py::make_tuple(self.attr("value"), self.attr("extra"), self.attr("__dict__"));
+            },
+            [](const py::tuple &t) {
+                if (t.size() != 3)
+                    throw std::runtime_error("Invalid state!");
+
+                auto cpp_state = PickleableWithDictNew(t[0].cast<std::string>());
+                cpp_state.extra = t[1].cast<int>();
+
+                auto py_state = t[2].cast<py::dict>();
+                return std::make_pair(cpp_state, py_state);
+            }
+        ));
+#endif
+}
diff --git a/3rdparty/pybind11/tests/test_pickling.py b/3rdparty/pybind11/tests/test_pickling.py
new file mode 100644
index 00000000..5ae05aaa
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_pickling.py
@@ -0,0 +1,42 @@
+import pytest
+from pybind11_tests import pickling as m
+
+try:
+    import cPickle as pickle  # Use cPickle on Python 2.7
+except ImportError:
+    import pickle
+
+
+@pytest.mark.parametrize("cls_name", ["Pickleable", "PickleableNew"])
+def test_roundtrip(cls_name):
+    cls = getattr(m, cls_name)
+    p = cls("test_value")
+    p.setExtra1(15)
+    p.setExtra2(48)
+
+    data = pickle.dumps(p, 2)  # Must use pickle protocol >= 2
+    p2 = pickle.loads(data)
+    assert p2.value() == p.value()
+    assert p2.extra1() == p.extra1()
+    assert p2.extra2() == p.extra2()
+
+
+@pytest.unsupported_on_pypy
+@pytest.mark.parametrize("cls_name", ["PickleableWithDict", "PickleableWithDictNew"])
+def test_roundtrip_with_dict(cls_name):
+    cls = getattr(m, cls_name)
+    p = cls("test_value")
+    p.extra = 15
+    p.dynamic = "Attribute"
+
+    data = pickle.dumps(p, pickle.HIGHEST_PROTOCOL)
+    p2 = pickle.loads(data)
+    assert p2.value == p.value
+    assert p2.extra == p.extra
+    assert p2.dynamic == p.dynamic
+
+
+def test_enum_pickle():
+    from pybind11_tests import enums as e
+    data = pickle.dumps(e.EOne, 2)
+    assert e.EOne == pickle.loads(data)
diff --git a/3rdparty/pybind11/tests/test_pytypes.cpp b/3rdparty/pybind11/tests/test_pytypes.cpp
new file mode 100644
index 00000000..244e1db0
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_pytypes.cpp
@@ -0,0 +1,310 @@
+/*
+    tests/test_pytypes.cpp -- Python type casters
+
+    Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+
+TEST_SUBMODULE(pytypes, m) {
+    // test_list
+    m.def("get_list", []() {
+        py::list list;
+        list.append("value");
+        py::print("Entry at position 0:", list[0]);
+        list[0] = py::str("overwritten");
+        list.insert(0, "inserted-0");
+        list.insert(2, "inserted-2");
+        return list;
+    });
+    m.def("print_list", [](py::list list) {
+        int index = 0;
+        for (auto item : list)
+            py::print("list item {}: {}"_s.format(index++, item));
+    });
+
+    // test_set
+    m.def("get_set", []() {
+        py::set set;
+        set.add(py::str("key1"));
+        set.add("key2");
+        set.add(std::string("key3"));
+        return set;
+    });
+    m.def("print_set", [](py::set set) {
+        for (auto item : set)
+            py::print("key:", item);
+    });
+    m.def("set_contains", [](py::set set, py::object key) {
+        return set.contains(key);
+    });
+    m.def("set_contains", [](py::set set, const char* key) {
+        return set.contains(key);
+    });
+
+    // test_dict
+    m.def("get_dict", []() { return py::dict("key"_a="value"); });
+    m.def("print_dict", [](py::dict dict) {
+        for (auto item : dict)
+            py::print("key: {}, value={}"_s.format(item.first, item.second));
+    });
+    m.def("dict_keyword_constructor", []() {
+        auto d1 = py::dict("x"_a=1, "y"_a=2);
+        auto d2 = py::dict("z"_a=3, **d1);
+        return d2;
+    });
+    m.def("dict_contains", [](py::dict dict, py::object val) {
+        return dict.contains(val);
+    });
+    m.def("dict_contains", [](py::dict dict, const char* val) {
+        return dict.contains(val);
+    });
+
+    // test_str
+    m.def("str_from_string", []() { return py::str(std::string("baz")); });
+    m.def("str_from_bytes", []() { return py::str(py::bytes("boo", 3)); });
+    m.def("str_from_object", [](const py::object& obj) { return py::str(obj); });
+    m.def("repr_from_object", [](const py::object& obj) { return py::repr(obj); });
+
+    m.def("str_format", []() {
+        auto s1 = "{} + {} = {}"_s.format(1, 2, 3);
+        auto s2 = "{a} + {b} = {c}"_s.format("a"_a=1, "b"_a=2, "c"_a=3);
+        return py::make_tuple(s1, s2);
+    });
+
+    // test_bytes
+    m.def("bytes_from_string", []() { return py::bytes(std::string("foo")); });
+    m.def("bytes_from_str", []() { return py::bytes(py::str("bar", 3)); });
+
+    // test_capsule
+    m.def("return_capsule_with_destructor", []() {
+        py::print("creating capsule");
+        return py::capsule([]() {
+            py::print("destructing capsule");
+        });
+    });
+
+    m.def("return_capsule_with_destructor_2", []() {
+        py::print("creating capsule");
+        return py::capsule((void *) 1234, [](void *ptr) {
+            py::print("destructing capsule: {}"_s.format((size_t) ptr));
+        });
+    });
+
+    m.def("return_capsule_with_name_and_destructor", []() {
+        auto capsule = py::capsule((void *) 1234, "pointer type description", [](PyObject *ptr) {
+            if (ptr) {
+                auto name = PyCapsule_GetName(ptr);
+                py::print("destructing capsule ({}, '{}')"_s.format(
+                    (size_t) PyCapsule_GetPointer(ptr, name), name
+                ));
+            }
+        });
+        void *contents = capsule;
+        py::print("created capsule ({}, '{}')"_s.format((size_t) contents, capsule.name()));
+        return capsule;
+    });
+
+    // test_accessors
+    m.def("accessor_api", [](py::object o) {
+        auto d = py::dict();
+
+        d["basic_attr"] = o.attr("basic_attr");
+
+        auto l = py::list();
+        for (const auto &item : o.attr("begin_end")) {
+            l.append(item);
+        }
+        d["begin_end"] = l;
+
+        d["operator[object]"] = o.attr("d")["operator[object]"_s];
+        d["operator[char *]"] = o.attr("d")["operator[char *]"];
+
+        d["attr(object)"] = o.attr("sub").attr("attr_obj");
+        d["attr(char *)"] = o.attr("sub").attr("attr_char");
+        try {
+            o.attr("sub").attr("missing").ptr();
+        } catch (const py::error_already_set &) {
+            d["missing_attr_ptr"] = "raised"_s;
+        }
+        try {
+            o.attr("missing").attr("doesn't matter");
+        } catch (const py::error_already_set &) {
+            d["missing_attr_chain"] = "raised"_s;
+        }
+
+        d["is_none"] = o.attr("basic_attr").is_none();
+
+        d["operator()"] = o.attr("func")(1);
+        d["operator*"] = o.attr("func")(*o.attr("begin_end"));
+
+        // Test implicit conversion
+        py::list implicit_list = o.attr("begin_end");
+        d["implicit_list"] = implicit_list;
+        py::dict implicit_dict = o.attr("__dict__");
+        d["implicit_dict"] = implicit_dict;
+
+        return d;
+    });
+
+    m.def("tuple_accessor", [](py::tuple existing_t) {
+        try {
+            existing_t[0] = 1;
+        } catch (const py::error_already_set &) {
+            // --> Python system error
+            // Only new tuples (refcount == 1) are mutable
+            auto new_t = py::tuple(3);
+            for (size_t i = 0; i < new_t.size(); ++i) {
+                new_t[i] = i;
+            }
+            return new_t;
+        }
+        return py::tuple();
+    });
+
+    m.def("accessor_assignment", []() {
+        auto l = py::list(1);
+        l[0] = 0;
+
+        auto d = py::dict();
+        d["get"] = l[0];
+        auto var = l[0];
+        d["deferred_get"] = var;
+        l[0] = 1;
+        d["set"] = l[0];
+        var = 99; // this assignment should not overwrite l[0]
+        d["deferred_set"] = l[0];
+        d["var"] = var;
+
+        return d;
+    });
+
+    // test_constructors
+    m.def("default_constructors", []() {
+        return py::dict(
+            "str"_a=py::str(),
+            "bool"_a=py::bool_(),
+            "int"_a=py::int_(),
+            "float"_a=py::float_(),
+            "tuple"_a=py::tuple(),
+            "list"_a=py::list(),
+            "dict"_a=py::dict(),
+            "set"_a=py::set()
+        );
+    });
+
+    m.def("converting_constructors", [](py::dict d) {
+        return py::dict(
+            "str"_a=py::str(d["str"]),
+            "bool"_a=py::bool_(d["bool"]),
+            "int"_a=py::int_(d["int"]),
+            "float"_a=py::float_(d["float"]),
+            "tuple"_a=py::tuple(d["tuple"]),
+            "list"_a=py::list(d["list"]),
+            "dict"_a=py::dict(d["dict"]),
+            "set"_a=py::set(d["set"]),
+            "memoryview"_a=py::memoryview(d["memoryview"])
+        );
+    });
+
+    m.def("cast_functions", [](py::dict d) {
+        // When converting between Python types, obj.cast<T>() should be the same as T(obj)
+        return py::dict(
+            "str"_a=d["str"].cast<py::str>(),
+            "bool"_a=d["bool"].cast<py::bool_>(),
+            "int"_a=d["int"].cast<py::int_>(),
+            "float"_a=d["float"].cast<py::float_>(),
+            "tuple"_a=d["tuple"].cast<py::tuple>(),
+            "list"_a=d["list"].cast<py::list>(),
+            "dict"_a=d["dict"].cast<py::dict>(),
+            "set"_a=d["set"].cast<py::set>(),
+            "memoryview"_a=d["memoryview"].cast<py::memoryview>()
+        );
+    });
+
+    m.def("get_implicit_casting", []() {
+        py::dict d;
+        d["char*_i1"] = "abc";
+        const char *c2 = "abc";
+        d["char*_i2"] = c2;
+        d["char*_e"] = py::cast(c2);
+        d["char*_p"] = py::str(c2);
+
+        d["int_i1"] = 42;
+        int i = 42;
+        d["int_i2"] = i;
+        i++;
+        d["int_e"] = py::cast(i);
+        i++;
+        d["int_p"] = py::int_(i);
+
+        d["str_i1"] = std::string("str");
+        std::string s2("str1");
+        d["str_i2"] = s2;
+        s2[3] = '2';
+        d["str_e"] = py::cast(s2);
+        s2[3] = '3';
+        d["str_p"] = py::str(s2);
+
+        py::list l(2);
+        l[0] = 3;
+        l[1] = py::cast(6);
+        l.append(9);
+        l.append(py::cast(12));
+        l.append(py::int_(15));
+
+        return py::dict(
+            "d"_a=d,
+            "l"_a=l
+        );
+    });
+
+    // test_print
+    m.def("print_function", []() {
+        py::print("Hello, World!");
+        py::print(1, 2.0, "three", true, std::string("-- multiple args"));
+        auto args = py::make_tuple("and", "a", "custom", "separator");
+        py::print("*args", *args, "sep"_a="-");
+        py::print("no new line here", "end"_a=" -- ");
+        py::print("next print");
+
+        auto py_stderr = py::module::import("sys").attr("stderr");
+        py::print("this goes to stderr", "file"_a=py_stderr);
+
+        py::print("flush", "flush"_a=true);
+
+        py::print("{a} + {b} = {c}"_s.format("a"_a="py::print", "b"_a="str.format", "c"_a="this"));
+    });
+
+    m.def("print_failure", []() { py::print(42, UnregisteredType()); });
+
+    m.def("hash_function", [](py::object obj) { return py::hash(obj); });
+
+    m.def("test_number_protocol", [](py::object a, py::object b) {
+        py::list l;
+        l.append(a.equal(b));
+        l.append(a.not_equal(b));
+        l.append(a < b);
+        l.append(a <= b);
+        l.append(a > b);
+        l.append(a >= b);
+        l.append(a + b);
+        l.append(a - b);
+        l.append(a * b);
+        l.append(a / b);
+        l.append(a | b);
+        l.append(a & b);
+        l.append(a ^ b);
+        l.append(a >> b);
+        l.append(a << b);
+        return l;
+    });
+
+    m.def("test_list_slicing", [](py::list a) {
+        return a[py::slice(0, -1, 2)];
+    });
+}
diff --git a/3rdparty/pybind11/tests/test_pytypes.py b/3rdparty/pybind11/tests/test_pytypes.py
new file mode 100644
index 00000000..0e8d6c33
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_pytypes.py
@@ -0,0 +1,263 @@
+from __future__ import division
+import pytest
+import sys
+
+from pybind11_tests import pytypes as m
+from pybind11_tests import debug_enabled
+
+
+def test_list(capture, doc):
+    with capture:
+        lst = m.get_list()
+        assert lst == ["inserted-0", "overwritten", "inserted-2"]
+
+        lst.append("value2")
+        m.print_list(lst)
+    assert capture.unordered == """
+        Entry at position 0: value
+        list item 0: inserted-0
+        list item 1: overwritten
+        list item 2: inserted-2
+        list item 3: value2
+    """
+
+    assert doc(m.get_list) == "get_list() -> list"
+    assert doc(m.print_list) == "print_list(arg0: list) -> None"
+
+
+def test_set(capture, doc):
+    s = m.get_set()
+    assert s == {"key1", "key2", "key3"}
+
+    with capture:
+        s.add("key4")
+        m.print_set(s)
+    assert capture.unordered == """
+        key: key1
+        key: key2
+        key: key3
+        key: key4
+    """
+
+    assert not m.set_contains(set([]), 42)
+    assert m.set_contains({42}, 42)
+    assert m.set_contains({"foo"}, "foo")
+
+    assert doc(m.get_list) == "get_list() -> list"
+    assert doc(m.print_list) == "print_list(arg0: list) -> None"
+
+
+def test_dict(capture, doc):
+    d = m.get_dict()
+    assert d == {"key": "value"}
+
+    with capture:
+        d["key2"] = "value2"
+        m.print_dict(d)
+    assert capture.unordered == """
+        key: key, value=value
+        key: key2, value=value2
+    """
+
+    assert not m.dict_contains({}, 42)
+    assert m.dict_contains({42: None}, 42)
+    assert m.dict_contains({"foo": None}, "foo")
+
+    assert doc(m.get_dict) == "get_dict() -> dict"
+    assert doc(m.print_dict) == "print_dict(arg0: dict) -> None"
+
+    assert m.dict_keyword_constructor() == {"x": 1, "y": 2, "z": 3}
+
+
+def test_str(doc):
+    assert m.str_from_string().encode().decode() == "baz"
+    assert m.str_from_bytes().encode().decode() == "boo"
+
+    assert doc(m.str_from_bytes) == "str_from_bytes() -> str"
+
+    class A(object):
+        def __str__(self):
+            return "this is a str"
+
+        def __repr__(self):
+            return "this is a repr"
+
+    assert m.str_from_object(A()) == "this is a str"
+    assert m.repr_from_object(A()) == "this is a repr"
+
+    s1, s2 = m.str_format()
+    assert s1 == "1 + 2 = 3"
+    assert s1 == s2
+
+
+def test_bytes(doc):
+    assert m.bytes_from_string().decode() == "foo"
+    assert m.bytes_from_str().decode() == "bar"
+
+    assert doc(m.bytes_from_str) == "bytes_from_str() -> {}".format(
+        "bytes" if sys.version_info[0] == 3 else "str"
+    )
+
+
+def test_capsule(capture):
+    pytest.gc_collect()
+    with capture:
+        a = m.return_capsule_with_destructor()
+        del a
+        pytest.gc_collect()
+    assert capture.unordered == """
+        creating capsule
+        destructing capsule
+    """
+
+    with capture:
+        a = m.return_capsule_with_destructor_2()
+        del a
+        pytest.gc_collect()
+    assert capture.unordered == """
+        creating capsule
+        destructing capsule: 1234
+    """
+
+    with capture:
+        a = m.return_capsule_with_name_and_destructor()
+        del a
+        pytest.gc_collect()
+    assert capture.unordered == """
+        created capsule (1234, 'pointer type description')
+        destructing capsule (1234, 'pointer type description')
+    """
+
+
+def test_accessors():
+    class SubTestObject:
+        attr_obj = 1
+        attr_char = 2
+
+    class TestObject:
+        basic_attr = 1
+        begin_end = [1, 2, 3]
+        d = {"operator[object]": 1, "operator[char *]": 2}
+        sub = SubTestObject()
+
+        def func(self, x, *args):
+            return self.basic_attr + x + sum(args)
+
+    d = m.accessor_api(TestObject())
+    assert d["basic_attr"] == 1
+    assert d["begin_end"] == [1, 2, 3]
+    assert d["operator[object]"] == 1
+    assert d["operator[char *]"] == 2
+    assert d["attr(object)"] == 1
+    assert d["attr(char *)"] == 2
+    assert d["missing_attr_ptr"] == "raised"
+    assert d["missing_attr_chain"] == "raised"
+    assert d["is_none"] is False
+    assert d["operator()"] == 2
+    assert d["operator*"] == 7
+    assert d["implicit_list"] == [1, 2, 3]
+    assert all(x in TestObject.__dict__ for x in d["implicit_dict"])
+
+    assert m.tuple_accessor(tuple()) == (0, 1, 2)
+
+    d = m.accessor_assignment()
+    assert d["get"] == 0
+    assert d["deferred_get"] == 0
+    assert d["set"] == 1
+    assert d["deferred_set"] == 1
+    assert d["var"] == 99
+
+
+def test_constructors():
+    """C++ default and converting constructors are equivalent to type calls in Python"""
+    types = [str, bool, int, float, tuple, list, dict, set]
+    expected = {t.__name__: t() for t in types}
+    assert m.default_constructors() == expected
+
+    data = {
+        str: 42,
+        bool: "Not empty",
+        int: "42",
+        float: "+1e3",
+        tuple: range(3),
+        list: range(3),
+        dict: [("two", 2), ("one", 1), ("three", 3)],
+        set: [4, 4, 5, 6, 6, 6],
+        memoryview: b'abc'
+    }
+    inputs = {k.__name__: v for k, v in data.items()}
+    expected = {k.__name__: k(v) for k, v in data.items()}
+
+    assert m.converting_constructors(inputs) == expected
+    assert m.cast_functions(inputs) == expected
+
+    # Converting constructors and cast functions should just reference rather
+    # than copy when no conversion is needed:
+    noconv1 = m.converting_constructors(expected)
+    for k in noconv1:
+        assert noconv1[k] is expected[k]
+
+    noconv2 = m.cast_functions(expected)
+    for k in noconv2:
+        assert noconv2[k] is expected[k]
+
+
+def test_implicit_casting():
+    """Tests implicit casting when assigning or appending to dicts and lists."""
+    z = m.get_implicit_casting()
+    assert z['d'] == {
+        'char*_i1': 'abc', 'char*_i2': 'abc', 'char*_e': 'abc', 'char*_p': 'abc',
+        'str_i1': 'str', 'str_i2': 'str1', 'str_e': 'str2', 'str_p': 'str3',
+        'int_i1': 42, 'int_i2': 42, 'int_e': 43, 'int_p': 44
+    }
+    assert z['l'] == [3, 6, 9, 12, 15]
+
+
+def test_print(capture):
+    with capture:
+        m.print_function()
+    assert capture == """
+        Hello, World!
+        1 2.0 three True -- multiple args
+        *args-and-a-custom-separator
+        no new line here -- next print
+        flush
+        py::print + str.format = this
+    """
+    assert capture.stderr == "this goes to stderr"
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.print_failure()
+    assert str(excinfo.value) == "make_tuple(): unable to convert " + (
+        "argument of type 'UnregisteredType' to Python object"
+        if debug_enabled else
+        "arguments to Python object (compile in debug mode for details)"
+    )
+
+
+def test_hash():
+    class Hashable(object):
+        def __init__(self, value):
+            self.value = value
+
+        def __hash__(self):
+            return self.value
+
+    class Unhashable(object):
+        __hash__ = None
+
+    assert m.hash_function(Hashable(42)) == 42
+    with pytest.raises(TypeError):
+        m.hash_function(Unhashable())
+
+
+def test_number_protocol():
+    for a, b in [(1, 1), (3, 5)]:
+        li = [a == b, a != b, a < b, a <= b, a > b, a >= b, a + b,
+              a - b, a * b, a / b, a | b, a & b, a ^ b, a >> b, a << b]
+        assert m.test_number_protocol(a, b) == li
+
+
+def test_list_slicing():
+    li = list(range(100))
+    assert li[::2] == m.test_list_slicing(li)
diff --git a/3rdparty/pybind11/tests/test_sequences_and_iterators.cpp b/3rdparty/pybind11/tests/test_sequences_and_iterators.cpp
new file mode 100644
index 00000000..87ccf99d
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_sequences_and_iterators.cpp
@@ -0,0 +1,353 @@
+/*
+    tests/test_sequences_and_iterators.cpp -- supporting Pythons' sequence protocol, iterators,
+    etc.
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/operators.h>
+#include <pybind11/stl.h>
+
+template<typename T>
+class NonZeroIterator {
+    const T* ptr_;
+public:
+    NonZeroIterator(const T* ptr) : ptr_(ptr) {}
+    const T& operator*() const { return *ptr_; }
+    NonZeroIterator& operator++() { ++ptr_; return *this; }
+};
+
+class NonZeroSentinel {};
+
+template<typename A, typename B>
+bool operator==(const NonZeroIterator<std::pair<A, B>>& it, const NonZeroSentinel&) {
+    return !(*it).first || !(*it).second;
+}
+
+template <typename PythonType>
+py::list test_random_access_iterator(PythonType x) {
+    if (x.size() < 5)
+        throw py::value_error("Please provide at least 5 elements for testing.");
+
+    auto checks = py::list();
+    auto assert_equal = [&checks](py::handle a, py::handle b) {
+        auto result = PyObject_RichCompareBool(a.ptr(), b.ptr(), Py_EQ);
+        if (result == -1) { throw py::error_already_set(); }
+        checks.append(result != 0);
+    };
+
+    auto it = x.begin();
+    assert_equal(x[0], *it);
+    assert_equal(x[0], it[0]);
+    assert_equal(x[1], it[1]);
+
+    assert_equal(x[1], *(++it));
+    assert_equal(x[1], *(it++));
+    assert_equal(x[2], *it);
+    assert_equal(x[3], *(it += 1));
+    assert_equal(x[2], *(--it));
+    assert_equal(x[2], *(it--));
+    assert_equal(x[1], *it);
+    assert_equal(x[0], *(it -= 1));
+
+    assert_equal(it->attr("real"), x[0].attr("real"));
+    assert_equal((it + 1)->attr("real"), x[1].attr("real"));
+
+    assert_equal(x[1], *(it + 1));
+    assert_equal(x[1], *(1 + it));
+    it += 3;
+    assert_equal(x[1], *(it - 2));
+
+    checks.append(static_cast<std::size_t>(x.end() - x.begin()) == x.size());
+    checks.append((x.begin() + static_cast<std::ptrdiff_t>(x.size())) == x.end());
+    checks.append(x.begin() < x.end());
+
+    return checks;
+}
+
+TEST_SUBMODULE(sequences_and_iterators, m) {
+    // test_sliceable
+    class Sliceable{
+    public:
+      Sliceable(int n): size(n) {}
+      int start,stop,step;
+      int size;
+    };
+    py::class_<Sliceable>(m,"Sliceable")
+        .def(py::init<int>())
+        .def("__getitem__",[](const Sliceable &s, py::slice slice) {
+          ssize_t start, stop, step, slicelength;
+          if (!slice.compute(s.size, &start, &stop, &step, &slicelength))
+              throw py::error_already_set();
+          int istart = static_cast<int>(start);
+          int istop =  static_cast<int>(stop);
+          int istep =  static_cast<int>(step);
+          return std::make_tuple(istart,istop,istep);
+        })
+        ;
+
+    // test_sequence
+    class Sequence {
+    public:
+        Sequence(size_t size) : m_size(size) {
+            print_created(this, "of size", m_size);
+            m_data = new float[size];
+            memset(m_data, 0, sizeof(float) * size);
+        }
+        Sequence(const std::vector<float> &value) : m_size(value.size()) {
+            print_created(this, "of size", m_size, "from std::vector");
+            m_data = new float[m_size];
+            memcpy(m_data, &value[0], sizeof(float) * m_size);
+        }
+        Sequence(const Sequence &s) : m_size(s.m_size) {
+            print_copy_created(this);
+            m_data = new float[m_size];
+            memcpy(m_data, s.m_data, sizeof(float)*m_size);
+        }
+        Sequence(Sequence &&s) : m_size(s.m_size), m_data(s.m_data) {
+            print_move_created(this);
+            s.m_size = 0;
+            s.m_data = nullptr;
+        }
+
+        ~Sequence() { print_destroyed(this); delete[] m_data; }
+
+        Sequence &operator=(const Sequence &s) {
+            if (&s != this) {
+                delete[] m_data;
+                m_size = s.m_size;
+                m_data = new float[m_size];
+                memcpy(m_data, s.m_data, sizeof(float)*m_size);
+            }
+            print_copy_assigned(this);
+            return *this;
+        }
+
+        Sequence &operator=(Sequence &&s) {
+            if (&s != this) {
+                delete[] m_data;
+                m_size = s.m_size;
+                m_data = s.m_data;
+                s.m_size = 0;
+                s.m_data = nullptr;
+            }
+            print_move_assigned(this);
+            return *this;
+        }
+
+        bool operator==(const Sequence &s) const {
+            if (m_size != s.size()) return false;
+            for (size_t i = 0; i < m_size; ++i)
+                if (m_data[i] != s[i])
+                    return false;
+            return true;
+        }
+        bool operator!=(const Sequence &s) const { return !operator==(s); }
+
+        float operator[](size_t index) const { return m_data[index]; }
+        float &operator[](size_t index) { return m_data[index]; }
+
+        bool contains(float v) const {
+            for (size_t i = 0; i < m_size; ++i)
+                if (v == m_data[i])
+                    return true;
+            return false;
+        }
+
+        Sequence reversed() const {
+            Sequence result(m_size);
+            for (size_t i = 0; i < m_size; ++i)
+                result[m_size - i - 1] = m_data[i];
+            return result;
+        }
+
+        size_t size() const { return m_size; }
+
+        const float *begin() const { return m_data; }
+        const float *end() const { return m_data+m_size; }
+
+    private:
+        size_t m_size;
+        float *m_data;
+    };
+    py::class_<Sequence>(m, "Sequence")
+        .def(py::init<size_t>())
+        .def(py::init<const std::vector<float>&>())
+        /// Bare bones interface
+        .def("__getitem__", [](const Sequence &s, size_t i) {
+            if (i >= s.size()) throw py::index_error();
+            return s[i];
+        })
+        .def("__setitem__", [](Sequence &s, size_t i, float v) {
+            if (i >= s.size()) throw py::index_error();
+            s[i] = v;
+        })
+        .def("__len__", &Sequence::size)
+        /// Optional sequence protocol operations
+        .def("__iter__", [](const Sequence &s) { return py::make_iterator(s.begin(), s.end()); },
+                         py::keep_alive<0, 1>() /* Essential: keep object alive while iterator exists */)
+        .def("__contains__", [](const Sequence &s, float v) { return s.contains(v); })
+        .def("__reversed__", [](const Sequence &s) -> Sequence { return s.reversed(); })
+        /// Slicing protocol (optional)
+        .def("__getitem__", [](const Sequence &s, py::slice slice) -> Sequence* {
+            size_t start, stop, step, slicelength;
+            if (!slice.compute(s.size(), &start, &stop, &step, &slicelength))
+                throw py::error_already_set();
+            Sequence *seq = new Sequence(slicelength);
+            for (size_t i = 0; i < slicelength; ++i) {
+                (*seq)[i] = s[start]; start += step;
+            }
+            return seq;
+        })
+        .def("__setitem__", [](Sequence &s, py::slice slice, const Sequence &value) {
+            size_t start, stop, step, slicelength;
+            if (!slice.compute(s.size(), &start, &stop, &step, &slicelength))
+                throw py::error_already_set();
+            if (slicelength != value.size())
+                throw std::runtime_error("Left and right hand size of slice assignment have different sizes!");
+            for (size_t i = 0; i < slicelength; ++i) {
+                s[start] = value[i]; start += step;
+            }
+        })
+        /// Comparisons
+        .def(py::self == py::self)
+        .def(py::self != py::self)
+        // Could also define py::self + py::self for concatenation, etc.
+        ;
+
+    // test_map_iterator
+    // Interface of a map-like object that isn't (directly) an unordered_map, but provides some basic
+    // map-like functionality.
+    class StringMap {
+    public:
+        StringMap() = default;
+        StringMap(std::unordered_map<std::string, std::string> init)
+            : map(std::move(init)) {}
+
+        void set(std::string key, std::string val) { map[key] = val; }
+        std::string get(std::string key) const { return map.at(key); }
+        size_t size() const { return map.size(); }
+    private:
+        std::unordered_map<std::string, std::string> map;
+    public:
+        decltype(map.cbegin()) begin() const { return map.cbegin(); }
+        decltype(map.cend()) end() const { return map.cend(); }
+    };
+    py::class_<StringMap>(m, "StringMap")
+        .def(py::init<>())
+        .def(py::init<std::unordered_map<std::string, std::string>>())
+        .def("__getitem__", [](const StringMap &map, std::string key) {
+                try { return map.get(key); }
+                catch (const std::out_of_range&) {
+                    throw py::key_error("key '" + key + "' does not exist");
+                }
+        })
+        .def("__setitem__", &StringMap::set)
+        .def("__len__", &StringMap::size)
+        .def("__iter__", [](const StringMap &map) { return py::make_key_iterator(map.begin(), map.end()); },
+                py::keep_alive<0, 1>())
+        .def("items", [](const StringMap &map) { return py::make_iterator(map.begin(), map.end()); },
+                py::keep_alive<0, 1>())
+        ;
+
+    // test_generalized_iterators
+    class IntPairs {
+    public:
+        IntPairs(std::vector<std::pair<int, int>> data) : data_(std::move(data)) {}
+        const std::pair<int, int>* begin() const { return data_.data(); }
+    private:
+        std::vector<std::pair<int, int>> data_;
+    };
+    py::class_<IntPairs>(m, "IntPairs")
+        .def(py::init<std::vector<std::pair<int, int>>>())
+        .def("nonzero", [](const IntPairs& s) {
+                return py::make_iterator(NonZeroIterator<std::pair<int, int>>(s.begin()), NonZeroSentinel());
+        }, py::keep_alive<0, 1>())
+        .def("nonzero_keys", [](const IntPairs& s) {
+            return py::make_key_iterator(NonZeroIterator<std::pair<int, int>>(s.begin()), NonZeroSentinel());
+        }, py::keep_alive<0, 1>())
+        ;
+
+
+#if 0
+    // Obsolete: special data structure for exposing custom iterator types to python
+    // kept here for illustrative purposes because there might be some use cases which
+    // are not covered by the much simpler py::make_iterator
+
+    struct PySequenceIterator {
+        PySequenceIterator(const Sequence &seq, py::object ref) : seq(seq), ref(ref) { }
+
+        float next() {
+            if (index == seq.size())
+                throw py::stop_iteration();
+            return seq[index++];
+        }
+
+        const Sequence &seq;
+        py::object ref; // keep a reference
+        size_t index = 0;
+    };
+
+    py::class_<PySequenceIterator>(seq, "Iterator")
+        .def("__iter__", [](PySequenceIterator &it) -> PySequenceIterator& { return it; })
+        .def("__next__", &PySequenceIterator::next);
+
+    On the actual Sequence object, the iterator would be constructed as follows:
+    .def("__iter__", [](py::object s) { return PySequenceIterator(s.cast<const Sequence &>(), s); })
+#endif
+
+    // test_python_iterator_in_cpp
+    m.def("object_to_list", [](py::object o) {
+        auto l = py::list();
+        for (auto item : o) {
+            l.append(item);
+        }
+        return l;
+    });
+
+    m.def("iterator_to_list", [](py::iterator it) {
+        auto l = py::list();
+        while (it != py::iterator::sentinel()) {
+            l.append(*it);
+            ++it;
+        }
+        return l;
+    });
+
+    // Make sure that py::iterator works with std algorithms
+    m.def("count_none", [](py::object o) {
+        return std::count_if(o.begin(), o.end(), [](py::handle h) { return h.is_none(); });
+    });
+
+    m.def("find_none", [](py::object o) {
+        auto it = std::find_if(o.begin(), o.end(), [](py::handle h) { return h.is_none(); });
+        return it->is_none();
+    });
+
+    m.def("count_nonzeros", [](py::dict d) {
+       return std::count_if(d.begin(), d.end(), [](std::pair<py::handle, py::handle> p) {
+           return p.second.cast<int>() != 0;
+       });
+    });
+
+    m.def("tuple_iterator", &test_random_access_iterator<py::tuple>);
+    m.def("list_iterator", &test_random_access_iterator<py::list>);
+    m.def("sequence_iterator", &test_random_access_iterator<py::sequence>);
+
+    // test_iterator_passthrough
+    // #181: iterator passthrough did not compile
+    m.def("iterator_passthrough", [](py::iterator s) -> py::iterator {
+        return py::make_iterator(std::begin(s), std::end(s));
+    });
+
+    // test_iterator_rvp
+    // #388: Can't make iterators via make_iterator() with different r/v policies
+    static std::vector<int> list = { 1, 2, 3 };
+    m.def("make_iterator_1", []() { return py::make_iterator<py::return_value_policy::copy>(list); });
+    m.def("make_iterator_2", []() { return py::make_iterator<py::return_value_policy::automatic>(list); });
+}
diff --git a/3rdparty/pybind11/tests/test_sequences_and_iterators.py b/3rdparty/pybind11/tests/test_sequences_and_iterators.py
new file mode 100644
index 00000000..6bd16064
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_sequences_and_iterators.py
@@ -0,0 +1,171 @@
+import pytest
+from pybind11_tests import sequences_and_iterators as m
+from pybind11_tests import ConstructorStats
+
+
+def isclose(a, b, rel_tol=1e-05, abs_tol=0.0):
+    """Like math.isclose() from Python 3.5"""
+    return abs(a - b) <= max(rel_tol * max(abs(a), abs(b)), abs_tol)
+
+
+def allclose(a_list, b_list, rel_tol=1e-05, abs_tol=0.0):
+    return all(isclose(a, b, rel_tol=rel_tol, abs_tol=abs_tol) for a, b in zip(a_list, b_list))
+
+
+def test_generalized_iterators():
+    assert list(m.IntPairs([(1, 2), (3, 4), (0, 5)]).nonzero()) == [(1, 2), (3, 4)]
+    assert list(m.IntPairs([(1, 2), (2, 0), (0, 3), (4, 5)]).nonzero()) == [(1, 2)]
+    assert list(m.IntPairs([(0, 3), (1, 2), (3, 4)]).nonzero()) == []
+
+    assert list(m.IntPairs([(1, 2), (3, 4), (0, 5)]).nonzero_keys()) == [1, 3]
+    assert list(m.IntPairs([(1, 2), (2, 0), (0, 3), (4, 5)]).nonzero_keys()) == [1]
+    assert list(m.IntPairs([(0, 3), (1, 2), (3, 4)]).nonzero_keys()) == []
+
+    # __next__ must continue to raise StopIteration
+    it = m.IntPairs([(0, 0)]).nonzero()
+    for _ in range(3):
+        with pytest.raises(StopIteration):
+            next(it)
+
+    it = m.IntPairs([(0, 0)]).nonzero_keys()
+    for _ in range(3):
+        with pytest.raises(StopIteration):
+            next(it)
+
+
+def test_sliceable():
+    sliceable = m.Sliceable(100)
+    assert sliceable[::] == (0, 100, 1)
+    assert sliceable[10::] == (10, 100, 1)
+    assert sliceable[:10:] == (0, 10, 1)
+    assert sliceable[::10] == (0, 100, 10)
+    assert sliceable[-10::] == (90, 100, 1)
+    assert sliceable[:-10:] == (0, 90, 1)
+    assert sliceable[::-10] == (99, -1, -10)
+    assert sliceable[50:60:1] == (50, 60, 1)
+    assert sliceable[50:60:-1] == (50, 60, -1)
+
+
+def test_sequence():
+    cstats = ConstructorStats.get(m.Sequence)
+
+    s = m.Sequence(5)
+    assert cstats.values() == ['of size', '5']
+
+    assert "Sequence" in repr(s)
+    assert len(s) == 5
+    assert s[0] == 0 and s[3] == 0
+    assert 12.34 not in s
+    s[0], s[3] = 12.34, 56.78
+    assert 12.34 in s
+    assert isclose(s[0], 12.34) and isclose(s[3], 56.78)
+
+    rev = reversed(s)
+    assert cstats.values() == ['of size', '5']
+
+    rev2 = s[::-1]
+    assert cstats.values() == ['of size', '5']
+
+    it = iter(m.Sequence(0))
+    for _ in range(3):  # __next__ must continue to raise StopIteration
+        with pytest.raises(StopIteration):
+            next(it)
+    assert cstats.values() == ['of size', '0']
+
+    expected = [0, 56.78, 0, 0, 12.34]
+    assert allclose(rev, expected)
+    assert allclose(rev2, expected)
+    assert rev == rev2
+
+    rev[0::2] = m.Sequence([2.0, 2.0, 2.0])
+    assert cstats.values() == ['of size', '3', 'from std::vector']
+
+    assert allclose(rev, [2, 56.78, 2, 0, 2])
+
+    assert cstats.alive() == 4
+    del it
+    assert cstats.alive() == 3
+    del s
+    assert cstats.alive() == 2
+    del rev
+    assert cstats.alive() == 1
+    del rev2
+    assert cstats.alive() == 0
+
+    assert cstats.values() == []
+    assert cstats.default_constructions == 0
+    assert cstats.copy_constructions == 0
+    assert cstats.move_constructions >= 1
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+
+def test_map_iterator():
+    sm = m.StringMap({'hi': 'bye', 'black': 'white'})
+    assert sm['hi'] == 'bye'
+    assert len(sm) == 2
+    assert sm['black'] == 'white'
+
+    with pytest.raises(KeyError):
+        assert sm['orange']
+    sm['orange'] = 'banana'
+    assert sm['orange'] == 'banana'
+
+    expected = {'hi': 'bye', 'black': 'white', 'orange': 'banana'}
+    for k in sm:
+        assert sm[k] == expected[k]
+    for k, v in sm.items():
+        assert v == expected[k]
+
+    it = iter(m.StringMap({}))
+    for _ in range(3):  # __next__ must continue to raise StopIteration
+        with pytest.raises(StopIteration):
+            next(it)
+
+
+def test_python_iterator_in_cpp():
+    t = (1, 2, 3)
+    assert m.object_to_list(t) == [1, 2, 3]
+    assert m.object_to_list(iter(t)) == [1, 2, 3]
+    assert m.iterator_to_list(iter(t)) == [1, 2, 3]
+
+    with pytest.raises(TypeError) as excinfo:
+        m.object_to_list(1)
+    assert "object is not iterable" in str(excinfo.value)
+
+    with pytest.raises(TypeError) as excinfo:
+        m.iterator_to_list(1)
+    assert "incompatible function arguments" in str(excinfo.value)
+
+    def bad_next_call():
+        raise RuntimeError("py::iterator::advance() should propagate errors")
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.iterator_to_list(iter(bad_next_call, None))
+    assert str(excinfo.value) == "py::iterator::advance() should propagate errors"
+
+    lst = [1, None, 0, None]
+    assert m.count_none(lst) == 2
+    assert m.find_none(lst) is True
+    assert m.count_nonzeros({"a": 0, "b": 1, "c": 2}) == 2
+
+    r = range(5)
+    assert all(m.tuple_iterator(tuple(r)))
+    assert all(m.list_iterator(list(r)))
+    assert all(m.sequence_iterator(r))
+
+
+def test_iterator_passthrough():
+    """#181: iterator passthrough did not compile"""
+    from pybind11_tests.sequences_and_iterators import iterator_passthrough
+
+    assert list(iterator_passthrough(iter([3, 5, 7, 9, 11, 13, 15]))) == [3, 5, 7, 9, 11, 13, 15]
+
+
+def test_iterator_rvp():
+    """#388: Can't make iterators via make_iterator() with different r/v policies """
+    import pybind11_tests.sequences_and_iterators as m
+
+    assert list(m.make_iterator_1()) == [1, 2, 3]
+    assert list(m.make_iterator_2()) == [1, 2, 3]
+    assert not isinstance(m.make_iterator_1(), type(m.make_iterator_2()))
diff --git a/3rdparty/pybind11/tests/test_smart_ptr.cpp b/3rdparty/pybind11/tests/test_smart_ptr.cpp
new file mode 100644
index 00000000..87c9be8c
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_smart_ptr.cpp
@@ -0,0 +1,366 @@
+/*
+    tests/test_smart_ptr.cpp -- binding classes with custom reference counting,
+    implicit conversions between types
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#if defined(_MSC_VER) && _MSC_VER < 1910
+#  pragma warning(disable: 4702) // unreachable code in system header
+#endif
+
+#include "pybind11_tests.h"
+#include "object.h"
+
+// Make pybind aware of the ref-counted wrapper type (s):
+
+// ref<T> is a wrapper for 'Object' which uses intrusive reference counting
+// It is always possible to construct a ref<T> from an Object* pointer without
+// possible inconsistencies, hence the 'true' argument at the end.
+PYBIND11_DECLARE_HOLDER_TYPE(T, ref<T>, true);
+// Make pybind11 aware of the non-standard getter member function
+namespace pybind11 { namespace detail {
+    template <typename T>
+    struct holder_helper<ref<T>> {
+        static const T *get(const ref<T> &p) { return p.get_ptr(); }
+    };
+}}
+
+// The following is not required anymore for std::shared_ptr, but it should compile without error:
+PYBIND11_DECLARE_HOLDER_TYPE(T, std::shared_ptr<T>);
+
+// This is just a wrapper around unique_ptr, but with extra fields to deliberately bloat up the
+// holder size to trigger the non-simple-layout internal instance layout for single inheritance with
+// large holder type:
+template <typename T> class huge_unique_ptr {
+    std::unique_ptr<T> ptr;
+    uint64_t padding[10];
+public:
+    huge_unique_ptr(T *p) : ptr(p) {};
+    T *get() { return ptr.get(); }
+};
+PYBIND11_DECLARE_HOLDER_TYPE(T, huge_unique_ptr<T>);
+
+// Simple custom holder that works like unique_ptr
+template <typename T>
+class custom_unique_ptr {
+    std::unique_ptr<T> impl;
+public:
+    custom_unique_ptr(T* p) : impl(p) { }
+    T* get() const { return impl.get(); }
+    T* release_ptr() { return impl.release(); }
+};
+PYBIND11_DECLARE_HOLDER_TYPE(T, custom_unique_ptr<T>);
+
+// Simple custom holder that works like shared_ptr and has operator& overload
+// To obtain address of an instance of this holder pybind should use std::addressof
+// Attempt to get address via operator& may leads to segmentation fault
+template <typename T>
+class shared_ptr_with_addressof_operator {
+    std::shared_ptr<T> impl;
+public:
+    shared_ptr_with_addressof_operator( ) = default;
+    shared_ptr_with_addressof_operator(T* p) : impl(p) { }
+    T* get() const { return impl.get(); }
+    T** operator&() { throw std::logic_error("Call of overloaded operator& is not expected"); }
+};
+PYBIND11_DECLARE_HOLDER_TYPE(T, shared_ptr_with_addressof_operator<T>);
+
+// Simple custom holder that works like unique_ptr and has operator& overload
+// To obtain address of an instance of this holder pybind should use std::addressof
+// Attempt to get address via operator& may leads to segmentation fault
+template <typename T>
+class unique_ptr_with_addressof_operator {
+    std::unique_ptr<T> impl;
+public:
+    unique_ptr_with_addressof_operator() = default;
+    unique_ptr_with_addressof_operator(T* p) : impl(p) { }
+    T* get() const { return impl.get(); }
+    T* release_ptr() { return impl.release(); }
+    T** operator&() { throw std::logic_error("Call of overloaded operator& is not expected"); }
+};
+PYBIND11_DECLARE_HOLDER_TYPE(T, unique_ptr_with_addressof_operator<T>);
+
+
+TEST_SUBMODULE(smart_ptr, m) {
+
+    // test_smart_ptr
+
+    // Object implementation in `object.h`
+    py::class_<Object, ref<Object>> obj(m, "Object");
+    obj.def("getRefCount", &Object::getRefCount);
+
+    // Custom object with builtin reference counting (see 'object.h' for the implementation)
+    class MyObject1 : public Object {
+    public:
+        MyObject1(int value) : value(value) { print_created(this, toString()); }
+        std::string toString() const { return "MyObject1[" + std::to_string(value) + "]"; }
+    protected:
+        virtual ~MyObject1() { print_destroyed(this); }
+    private:
+        int value;
+    };
+    py::class_<MyObject1, ref<MyObject1>>(m, "MyObject1", obj)
+        .def(py::init<int>());
+    py::implicitly_convertible<py::int_, MyObject1>();
+
+    m.def("make_object_1", []() -> Object * { return new MyObject1(1); });
+    m.def("make_object_2", []() -> ref<Object> { return new MyObject1(2); });
+    m.def("make_myobject1_1", []() -> MyObject1 * { return new MyObject1(4); });
+    m.def("make_myobject1_2", []() -> ref<MyObject1> { return new MyObject1(5); });
+    m.def("print_object_1", [](const Object *obj) { py::print(obj->toString()); });
+    m.def("print_object_2", [](ref<Object> obj) { py::print(obj->toString()); });
+    m.def("print_object_3", [](const ref<Object> &obj) { py::print(obj->toString()); });
+    m.def("print_object_4", [](const ref<Object> *obj) { py::print((*obj)->toString()); });
+    m.def("print_myobject1_1", [](const MyObject1 *obj) { py::print(obj->toString()); });
+    m.def("print_myobject1_2", [](ref<MyObject1> obj) { py::print(obj->toString()); });
+    m.def("print_myobject1_3", [](const ref<MyObject1> &obj) { py::print(obj->toString()); });
+    m.def("print_myobject1_4", [](const ref<MyObject1> *obj) { py::print((*obj)->toString()); });
+
+    // Expose constructor stats for the ref type
+    m.def("cstats_ref", &ConstructorStats::get<ref_tag>);
+
+
+    // Object managed by a std::shared_ptr<>
+    class MyObject2 {
+    public:
+        MyObject2(const MyObject2 &) = default;
+        MyObject2(int value) : value(value) { print_created(this, toString()); }
+        std::string toString() const { return "MyObject2[" + std::to_string(value) + "]"; }
+        virtual ~MyObject2() { print_destroyed(this); }
+    private:
+        int value;
+    };
+    py::class_<MyObject2, std::shared_ptr<MyObject2>>(m, "MyObject2")
+        .def(py::init<int>());
+    m.def("make_myobject2_1", []() { return new MyObject2(6); });
+    m.def("make_myobject2_2", []() { return std::make_shared<MyObject2>(7); });
+    m.def("print_myobject2_1", [](const MyObject2 *obj) { py::print(obj->toString()); });
+    m.def("print_myobject2_2", [](std::shared_ptr<MyObject2> obj) { py::print(obj->toString()); });
+    m.def("print_myobject2_3", [](const std::shared_ptr<MyObject2> &obj) { py::print(obj->toString()); });
+    m.def("print_myobject2_4", [](const std::shared_ptr<MyObject2> *obj) { py::print((*obj)->toString()); });
+
+    // Object managed by a std::shared_ptr<>, additionally derives from std::enable_shared_from_this<>
+    class MyObject3 : public std::enable_shared_from_this<MyObject3> {
+    public:
+        MyObject3(const MyObject3 &) = default;
+        MyObject3(int value) : value(value) { print_created(this, toString()); }
+        std::string toString() const { return "MyObject3[" + std::to_string(value) + "]"; }
+        virtual ~MyObject3() { print_destroyed(this); }
+    private:
+        int value;
+    };
+    py::class_<MyObject3, std::shared_ptr<MyObject3>>(m, "MyObject3")
+        .def(py::init<int>());
+    m.def("make_myobject3_1", []() { return new MyObject3(8); });
+    m.def("make_myobject3_2", []() { return std::make_shared<MyObject3>(9); });
+    m.def("print_myobject3_1", [](const MyObject3 *obj) { py::print(obj->toString()); });
+    m.def("print_myobject3_2", [](std::shared_ptr<MyObject3> obj) { py::print(obj->toString()); });
+    m.def("print_myobject3_3", [](const std::shared_ptr<MyObject3> &obj) { py::print(obj->toString()); });
+    m.def("print_myobject3_4", [](const std::shared_ptr<MyObject3> *obj) { py::print((*obj)->toString()); });
+
+    // test_smart_ptr_refcounting
+    m.def("test_object1_refcounting", []() {
+        ref<MyObject1> o = new MyObject1(0);
+        bool good = o->getRefCount() == 1;
+        py::object o2 = py::cast(o, py::return_value_policy::reference);
+        // always request (partial) ownership for objects with intrusive
+        // reference counting even when using the 'reference' RVP
+        good &= o->getRefCount() == 2;
+        return good;
+    });
+
+    // test_unique_nodelete
+    // Object with a private destructor
+    class MyObject4 {
+    public:
+        MyObject4(int value) : value{value} { print_created(this); }
+        int value;
+    private:
+        ~MyObject4() { print_destroyed(this); }
+    };
+    py::class_<MyObject4, std::unique_ptr<MyObject4, py::nodelete>>(m, "MyObject4")
+        .def(py::init<int>())
+        .def_readwrite("value", &MyObject4::value);
+
+    // test_unique_deleter
+    // Object with std::unique_ptr<T, D> where D is not matching the base class
+    // Object with a protected destructor
+    class MyObject4a {
+    public:
+        MyObject4a(int i) {
+            value = i;
+            print_created(this);
+        };
+        int value;
+    protected:
+        virtual ~MyObject4a() { print_destroyed(this); }
+    };
+    py::class_<MyObject4a, std::unique_ptr<MyObject4a, py::nodelete>>(m, "MyObject4a")
+        .def(py::init<int>())
+        .def_readwrite("value", &MyObject4a::value);
+
+    // Object derived but with public destructor and no Deleter in default holder
+    class MyObject4b : public MyObject4a {
+    public:
+        MyObject4b(int i) : MyObject4a(i) { print_created(this); }
+        ~MyObject4b() { print_destroyed(this); }
+    };
+    py::class_<MyObject4b, MyObject4a>(m, "MyObject4b")
+        .def(py::init<int>());
+
+    // test_large_holder
+    class MyObject5 { // managed by huge_unique_ptr
+    public:
+        MyObject5(int value) : value{value} { print_created(this); }
+        ~MyObject5() { print_destroyed(this); }
+        int value;
+    };
+    py::class_<MyObject5, huge_unique_ptr<MyObject5>>(m, "MyObject5")
+        .def(py::init<int>())
+        .def_readwrite("value", &MyObject5::value);
+
+    // test_shared_ptr_and_references
+    struct SharedPtrRef {
+        struct A {
+            A() { print_created(this); }
+            A(const A &) { print_copy_created(this); }
+            A(A &&) { print_move_created(this); }
+            ~A() { print_destroyed(this); }
+        };
+
+        A value = {};
+        std::shared_ptr<A> shared = std::make_shared<A>();
+    };
+    using A = SharedPtrRef::A;
+    py::class_<A, std::shared_ptr<A>>(m, "A");
+    py::class_<SharedPtrRef>(m, "SharedPtrRef")
+        .def(py::init<>())
+        .def_readonly("ref", &SharedPtrRef::value)
+        .def_property_readonly("copy", [](const SharedPtrRef &s) { return s.value; },
+                               py::return_value_policy::copy)
+        .def_readonly("holder_ref", &SharedPtrRef::shared)
+        .def_property_readonly("holder_copy", [](const SharedPtrRef &s) { return s.shared; },
+                               py::return_value_policy::copy)
+        .def("set_ref", [](SharedPtrRef &, const A &) { return true; })
+        .def("set_holder", [](SharedPtrRef &, std::shared_ptr<A>) { return true; });
+
+    // test_shared_ptr_from_this_and_references
+    struct SharedFromThisRef {
+        struct B : std::enable_shared_from_this<B> {
+            B() { print_created(this); }
+            B(const B &) : std::enable_shared_from_this<B>() { print_copy_created(this); }
+            B(B &&) : std::enable_shared_from_this<B>() { print_move_created(this); }
+            ~B() { print_destroyed(this); }
+        };
+
+        B value = {};
+        std::shared_ptr<B> shared = std::make_shared<B>();
+    };
+    using B = SharedFromThisRef::B;
+    py::class_<B, std::shared_ptr<B>>(m, "B");
+    py::class_<SharedFromThisRef>(m, "SharedFromThisRef")
+        .def(py::init<>())
+        .def_readonly("bad_wp", &SharedFromThisRef::value)
+        .def_property_readonly("ref", [](const SharedFromThisRef &s) -> const B & { return *s.shared; })
+        .def_property_readonly("copy", [](const SharedFromThisRef &s) { return s.value; },
+                               py::return_value_policy::copy)
+        .def_readonly("holder_ref", &SharedFromThisRef::shared)
+        .def_property_readonly("holder_copy", [](const SharedFromThisRef &s) { return s.shared; },
+                               py::return_value_policy::copy)
+        .def("set_ref", [](SharedFromThisRef &, const B &) { return true; })
+        .def("set_holder", [](SharedFromThisRef &, std::shared_ptr<B>) { return true; });
+
+    // Issue #865: shared_from_this doesn't work with virtual inheritance
+    struct SharedFromThisVBase : std::enable_shared_from_this<SharedFromThisVBase> {
+        SharedFromThisVBase() = default;
+        SharedFromThisVBase(const SharedFromThisVBase &) = default;
+        virtual ~SharedFromThisVBase() = default;
+    };
+    struct SharedFromThisVirt : virtual SharedFromThisVBase {};
+    static std::shared_ptr<SharedFromThisVirt> sft(new SharedFromThisVirt());
+    py::class_<SharedFromThisVirt, std::shared_ptr<SharedFromThisVirt>>(m, "SharedFromThisVirt")
+        .def_static("get", []() { return sft.get(); });
+
+    // test_move_only_holder
+    struct C {
+        C() { print_created(this); }
+        ~C() { print_destroyed(this); }
+    };
+    py::class_<C, custom_unique_ptr<C>>(m, "TypeWithMoveOnlyHolder")
+        .def_static("make", []() { return custom_unique_ptr<C>(new C); });
+
+    // test_holder_with_addressof_operator
+    struct TypeForHolderWithAddressOf {
+        TypeForHolderWithAddressOf() { print_created(this); }
+        TypeForHolderWithAddressOf(const TypeForHolderWithAddressOf &) { print_copy_created(this); }
+        TypeForHolderWithAddressOf(TypeForHolderWithAddressOf &&) { print_move_created(this); }
+        ~TypeForHolderWithAddressOf() { print_destroyed(this); }
+        std::string toString() const {
+            return "TypeForHolderWithAddressOf[" + std::to_string(value) + "]";
+        }
+        int value = 42;
+    };
+    using HolderWithAddressOf = shared_ptr_with_addressof_operator<TypeForHolderWithAddressOf>;
+    py::class_<TypeForHolderWithAddressOf, HolderWithAddressOf>(m, "TypeForHolderWithAddressOf")
+        .def_static("make", []() { return HolderWithAddressOf(new TypeForHolderWithAddressOf); })
+        .def("get", [](const HolderWithAddressOf &self) { return self.get(); })
+        .def("print_object_1", [](const TypeForHolderWithAddressOf *obj) { py::print(obj->toString()); })
+        .def("print_object_2", [](HolderWithAddressOf obj) { py::print(obj.get()->toString()); })
+        .def("print_object_3", [](const HolderWithAddressOf &obj) { py::print(obj.get()->toString()); })
+        .def("print_object_4", [](const HolderWithAddressOf *obj) { py::print((*obj).get()->toString()); });
+
+    // test_move_only_holder_with_addressof_operator
+    struct TypeForMoveOnlyHolderWithAddressOf {
+        TypeForMoveOnlyHolderWithAddressOf(int value) : value{value} { print_created(this); }
+        ~TypeForMoveOnlyHolderWithAddressOf() { print_destroyed(this); }
+        std::string toString() const {
+            return "MoveOnlyHolderWithAddressOf[" + std::to_string(value) + "]";
+        }
+        int value;
+    };
+    using MoveOnlyHolderWithAddressOf = unique_ptr_with_addressof_operator<TypeForMoveOnlyHolderWithAddressOf>;
+    py::class_<TypeForMoveOnlyHolderWithAddressOf, MoveOnlyHolderWithAddressOf>(m, "TypeForMoveOnlyHolderWithAddressOf")
+        .def_static("make", []() { return MoveOnlyHolderWithAddressOf(new TypeForMoveOnlyHolderWithAddressOf(0)); })
+        .def_readwrite("value", &TypeForMoveOnlyHolderWithAddressOf::value)
+        .def("print_object", [](const TypeForMoveOnlyHolderWithAddressOf *obj) { py::print(obj->toString()); });
+
+    // test_smart_ptr_from_default
+    struct HeldByDefaultHolder { };
+    py::class_<HeldByDefaultHolder>(m, "HeldByDefaultHolder")
+        .def(py::init<>())
+        .def_static("load_shared_ptr", [](std::shared_ptr<HeldByDefaultHolder>) {});
+
+    // test_shared_ptr_gc
+    // #187: issue involving std::shared_ptr<> return value policy & garbage collection
+    struct ElementBase {
+        virtual ~ElementBase() { } /* Force creation of virtual table */
+    };
+    py::class_<ElementBase, std::shared_ptr<ElementBase>>(m, "ElementBase");
+
+    struct ElementA : ElementBase {
+        ElementA(int v) : v(v) { }
+        int value() { return v; }
+        int v;
+    };
+    py::class_<ElementA, ElementBase, std::shared_ptr<ElementA>>(m, "ElementA")
+        .def(py::init<int>())
+        .def("value", &ElementA::value);
+
+    struct ElementList {
+        void add(std::shared_ptr<ElementBase> e) { l.push_back(e); }
+        std::vector<std::shared_ptr<ElementBase>> l;
+    };
+    py::class_<ElementList, std::shared_ptr<ElementList>>(m, "ElementList")
+        .def(py::init<>())
+        .def("add", &ElementList::add)
+        .def("get", [](ElementList &el) {
+            py::list list;
+            for (auto &e : el.l)
+                list.append(py::cast(e));
+            return list;
+        });
+}
diff --git a/3rdparty/pybind11/tests/test_smart_ptr.py b/3rdparty/pybind11/tests/test_smart_ptr.py
new file mode 100644
index 00000000..c6627043
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_smart_ptr.py
@@ -0,0 +1,286 @@
+import pytest
+from pybind11_tests import smart_ptr as m
+from pybind11_tests import ConstructorStats
+
+
+def test_smart_ptr(capture):
+    # Object1
+    for i, o in enumerate([m.make_object_1(), m.make_object_2(), m.MyObject1(3)], start=1):
+        assert o.getRefCount() == 1
+        with capture:
+            m.print_object_1(o)
+            m.print_object_2(o)
+            m.print_object_3(o)
+            m.print_object_4(o)
+        assert capture == "MyObject1[{i}]\n".format(i=i) * 4
+
+    for i, o in enumerate([m.make_myobject1_1(), m.make_myobject1_2(), m.MyObject1(6), 7],
+                          start=4):
+        print(o)
+        with capture:
+            if not isinstance(o, int):
+                m.print_object_1(o)
+                m.print_object_2(o)
+                m.print_object_3(o)
+                m.print_object_4(o)
+            m.print_myobject1_1(o)
+            m.print_myobject1_2(o)
+            m.print_myobject1_3(o)
+            m.print_myobject1_4(o)
+        assert capture == "MyObject1[{i}]\n".format(i=i) * (4 if isinstance(o, int) else 8)
+
+    cstats = ConstructorStats.get(m.MyObject1)
+    assert cstats.alive() == 0
+    expected_values = ['MyObject1[{}]'.format(i) for i in range(1, 7)] + ['MyObject1[7]'] * 4
+    assert cstats.values() == expected_values
+    assert cstats.default_constructions == 0
+    assert cstats.copy_constructions == 0
+    # assert cstats.move_constructions >= 0 # Doesn't invoke any
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+    # Object2
+    for i, o in zip([8, 6, 7], [m.MyObject2(8), m.make_myobject2_1(), m.make_myobject2_2()]):
+        print(o)
+        with capture:
+            m.print_myobject2_1(o)
+            m.print_myobject2_2(o)
+            m.print_myobject2_3(o)
+            m.print_myobject2_4(o)
+        assert capture == "MyObject2[{i}]\n".format(i=i) * 4
+
+    cstats = ConstructorStats.get(m.MyObject2)
+    assert cstats.alive() == 1
+    o = None
+    assert cstats.alive() == 0
+    assert cstats.values() == ['MyObject2[8]', 'MyObject2[6]', 'MyObject2[7]']
+    assert cstats.default_constructions == 0
+    assert cstats.copy_constructions == 0
+    # assert cstats.move_constructions >= 0 # Doesn't invoke any
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+    # Object3
+    for i, o in zip([9, 8, 9], [m.MyObject3(9), m.make_myobject3_1(), m.make_myobject3_2()]):
+        print(o)
+        with capture:
+            m.print_myobject3_1(o)
+            m.print_myobject3_2(o)
+            m.print_myobject3_3(o)
+            m.print_myobject3_4(o)
+        assert capture == "MyObject3[{i}]\n".format(i=i) * 4
+
+    cstats = ConstructorStats.get(m.MyObject3)
+    assert cstats.alive() == 1
+    o = None
+    assert cstats.alive() == 0
+    assert cstats.values() == ['MyObject3[9]', 'MyObject3[8]', 'MyObject3[9]']
+    assert cstats.default_constructions == 0
+    assert cstats.copy_constructions == 0
+    # assert cstats.move_constructions >= 0 # Doesn't invoke any
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+    # Object
+    cstats = ConstructorStats.get(m.Object)
+    assert cstats.alive() == 0
+    assert cstats.values() == []
+    assert cstats.default_constructions == 10
+    assert cstats.copy_constructions == 0
+    # assert cstats.move_constructions >= 0 # Doesn't invoke any
+    assert cstats.copy_assignments == 0
+    assert cstats.move_assignments == 0
+
+    # ref<>
+    cstats = m.cstats_ref()
+    assert cstats.alive() == 0
+    assert cstats.values() == ['from pointer'] * 10
+    assert cstats.default_constructions == 30
+    assert cstats.copy_constructions == 12
+    # assert cstats.move_constructions >= 0 # Doesn't invoke any
+    assert cstats.copy_assignments == 30
+    assert cstats.move_assignments == 0
+
+
+def test_smart_ptr_refcounting():
+    assert m.test_object1_refcounting()
+
+
+def test_unique_nodelete():
+    o = m.MyObject4(23)
+    assert o.value == 23
+    cstats = ConstructorStats.get(m.MyObject4)
+    assert cstats.alive() == 1
+    del o
+    assert cstats.alive() == 1  # Leak, but that's intentional
+
+
+def test_unique_nodelete4a():
+    o = m.MyObject4a(23)
+    assert o.value == 23
+    cstats = ConstructorStats.get(m.MyObject4a)
+    assert cstats.alive() == 1
+    del o
+    assert cstats.alive() == 1  # Leak, but that's intentional
+
+
+def test_unique_deleter():
+    o = m.MyObject4b(23)
+    assert o.value == 23
+    cstats4a = ConstructorStats.get(m.MyObject4a)
+    assert cstats4a.alive() == 2  # Two because of previous test
+    cstats4b = ConstructorStats.get(m.MyObject4b)
+    assert cstats4b.alive() == 1
+    del o
+    assert cstats4a.alive() == 1  # Should now only be one leftover from previous test
+    assert cstats4b.alive() == 0  # Should be deleted
+
+
+def test_large_holder():
+    o = m.MyObject5(5)
+    assert o.value == 5
+    cstats = ConstructorStats.get(m.MyObject5)
+    assert cstats.alive() == 1
+    del o
+    assert cstats.alive() == 0
+
+
+def test_shared_ptr_and_references():
+    s = m.SharedPtrRef()
+    stats = ConstructorStats.get(m.A)
+    assert stats.alive() == 2
+
+    ref = s.ref  # init_holder_helper(holder_ptr=false, owned=false)
+    assert stats.alive() == 2
+    assert s.set_ref(ref)
+    with pytest.raises(RuntimeError) as excinfo:
+        assert s.set_holder(ref)
+    assert "Unable to cast from non-held to held instance" in str(excinfo.value)
+
+    copy = s.copy  # init_holder_helper(holder_ptr=false, owned=true)
+    assert stats.alive() == 3
+    assert s.set_ref(copy)
+    assert s.set_holder(copy)
+
+    holder_ref = s.holder_ref  # init_holder_helper(holder_ptr=true, owned=false)
+    assert stats.alive() == 3
+    assert s.set_ref(holder_ref)
+    assert s.set_holder(holder_ref)
+
+    holder_copy = s.holder_copy  # init_holder_helper(holder_ptr=true, owned=true)
+    assert stats.alive() == 3
+    assert s.set_ref(holder_copy)
+    assert s.set_holder(holder_copy)
+
+    del ref, copy, holder_ref, holder_copy, s
+    assert stats.alive() == 0
+
+
+def test_shared_ptr_from_this_and_references():
+    s = m.SharedFromThisRef()
+    stats = ConstructorStats.get(m.B)
+    assert stats.alive() == 2
+
+    ref = s.ref  # init_holder_helper(holder_ptr=false, owned=false, bad_wp=false)
+    assert stats.alive() == 2
+    assert s.set_ref(ref)
+    assert s.set_holder(ref)  # std::enable_shared_from_this can create a holder from a reference
+
+    bad_wp = s.bad_wp  # init_holder_helper(holder_ptr=false, owned=false, bad_wp=true)
+    assert stats.alive() == 2
+    assert s.set_ref(bad_wp)
+    with pytest.raises(RuntimeError) as excinfo:
+        assert s.set_holder(bad_wp)
+    assert "Unable to cast from non-held to held instance" in str(excinfo.value)
+
+    copy = s.copy  # init_holder_helper(holder_ptr=false, owned=true, bad_wp=false)
+    assert stats.alive() == 3
+    assert s.set_ref(copy)
+    assert s.set_holder(copy)
+
+    holder_ref = s.holder_ref  # init_holder_helper(holder_ptr=true, owned=false, bad_wp=false)
+    assert stats.alive() == 3
+    assert s.set_ref(holder_ref)
+    assert s.set_holder(holder_ref)
+
+    holder_copy = s.holder_copy  # init_holder_helper(holder_ptr=true, owned=true, bad_wp=false)
+    assert stats.alive() == 3
+    assert s.set_ref(holder_copy)
+    assert s.set_holder(holder_copy)
+
+    del ref, bad_wp, copy, holder_ref, holder_copy, s
+    assert stats.alive() == 0
+
+    z = m.SharedFromThisVirt.get()
+    y = m.SharedFromThisVirt.get()
+    assert y is z
+
+
+def test_move_only_holder():
+    a = m.TypeWithMoveOnlyHolder.make()
+    stats = ConstructorStats.get(m.TypeWithMoveOnlyHolder)
+    assert stats.alive() == 1
+    del a
+    assert stats.alive() == 0
+
+
+def test_holder_with_addressof_operator():
+    # this test must not throw exception from c++
+    a = m.TypeForHolderWithAddressOf.make()
+    a.print_object_1()
+    a.print_object_2()
+    a.print_object_3()
+    a.print_object_4()
+
+    stats = ConstructorStats.get(m.TypeForHolderWithAddressOf)
+    assert stats.alive() == 1
+
+    np = m.TypeForHolderWithAddressOf.make()
+    assert stats.alive() == 2
+    del a
+    assert stats.alive() == 1
+    del np
+    assert stats.alive() == 0
+
+    b = m.TypeForHolderWithAddressOf.make()
+    c = b
+    assert b.get() is c.get()
+    assert stats.alive() == 1
+
+    del b
+    assert stats.alive() == 1
+
+    del c
+    assert stats.alive() == 0
+
+
+def test_move_only_holder_with_addressof_operator():
+    a = m.TypeForMoveOnlyHolderWithAddressOf.make()
+    a.print_object()
+
+    stats = ConstructorStats.get(m.TypeForMoveOnlyHolderWithAddressOf)
+    assert stats.alive() == 1
+
+    a.value = 42
+    assert a.value == 42
+
+    del a
+    assert stats.alive() == 0
+
+
+def test_smart_ptr_from_default():
+    instance = m.HeldByDefaultHolder()
+    with pytest.raises(RuntimeError) as excinfo:
+        m.HeldByDefaultHolder.load_shared_ptr(instance)
+    assert "Unable to load a custom holder type from a " \
+           "default-holder instance" in str(excinfo.value)
+
+
+def test_shared_ptr_gc():
+    """#187: issue involving std::shared_ptr<> return value policy & garbage collection"""
+    el = m.ElementList()
+    for i in range(10):
+        el.add(m.ElementA(i))
+    pytest.gc_collect()
+    for i, v in enumerate(el.get()):
+        assert i == v.value()
diff --git a/3rdparty/pybind11/tests/test_stl.cpp b/3rdparty/pybind11/tests/test_stl.cpp
new file mode 100644
index 00000000..207c9fb2
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_stl.cpp
@@ -0,0 +1,284 @@
+/*
+    tests/test_stl.cpp -- STL type casters
+
+    Copyright (c) 2017 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/stl.h>
+
+#include <vector>
+#include <string>
+
+// Test with `std::variant` in C++17 mode, or with `boost::variant` in C++11/14
+#if PYBIND11_HAS_VARIANT
+using std::variant;
+#elif defined(PYBIND11_TEST_BOOST) && (!defined(_MSC_VER) || _MSC_VER >= 1910)
+#  include <boost/variant.hpp>
+#  define PYBIND11_HAS_VARIANT 1
+using boost::variant;
+
+namespace pybind11 { namespace detail {
+template <typename... Ts>
+struct type_caster<boost::variant<Ts...>> : variant_caster<boost::variant<Ts...>> {};
+
+template <>
+struct visit_helper<boost::variant> {
+    template <typename... Args>
+    static auto call(Args &&...args) -> decltype(boost::apply_visitor(args...)) {
+        return boost::apply_visitor(args...);
+    }
+};
+}} // namespace pybind11::detail
+#endif
+
+PYBIND11_MAKE_OPAQUE(std::vector<std::string, std::allocator<std::string>>);
+
+/// Issue #528: templated constructor
+struct TplCtorClass {
+    template <typename T> TplCtorClass(const T &) { }
+    bool operator==(const TplCtorClass &) const { return true; }
+};
+
+namespace std {
+    template <>
+    struct hash<TplCtorClass> { size_t operator()(const TplCtorClass &) const { return 0; } };
+}
+
+
+TEST_SUBMODULE(stl, m) {
+    // test_vector
+    m.def("cast_vector", []() { return std::vector<int>{1}; });
+    m.def("load_vector", [](const std::vector<int> &v) { return v.at(0) == 1 && v.at(1) == 2; });
+    // `std::vector<bool>` is special because it returns proxy objects instead of references
+    m.def("cast_bool_vector", []() { return std::vector<bool>{true, false}; });
+    m.def("load_bool_vector", [](const std::vector<bool> &v) {
+        return v.at(0) == true && v.at(1) == false;
+    });
+    // Unnumbered regression (caused by #936): pointers to stl containers aren't castable
+    static std::vector<RValueCaster> lvv{2};
+    m.def("cast_ptr_vector", []() { return &lvv; });
+
+    // test_deque
+    m.def("cast_deque", []() { return std::deque<int>{1}; });
+    m.def("load_deque", [](const std::deque<int> &v) { return v.at(0) == 1 && v.at(1) == 2; });
+
+    // test_array
+    m.def("cast_array", []() { return std::array<int, 2> {{1 , 2}}; });
+    m.def("load_array", [](const std::array<int, 2> &a) { return a[0] == 1 && a[1] == 2; });
+
+    // test_valarray
+    m.def("cast_valarray", []() { return std::valarray<int>{1, 4, 9}; });
+    m.def("load_valarray", [](const std::valarray<int>& v) {
+        return v.size() == 3 && v[0] == 1 && v[1] == 4 && v[2] == 9;
+    });
+
+    // test_map
+    m.def("cast_map", []() { return std::map<std::string, std::string>{{"key", "value"}}; });
+    m.def("load_map", [](const std::map<std::string, std::string> &map) {
+        return map.at("key") == "value" && map.at("key2") == "value2";
+    });
+
+    // test_set
+    m.def("cast_set", []() { return std::set<std::string>{"key1", "key2"}; });
+    m.def("load_set", [](const std::set<std::string> &set) {
+        return set.count("key1") && set.count("key2") && set.count("key3");
+    });
+
+    // test_recursive_casting
+    m.def("cast_rv_vector", []() { return std::vector<RValueCaster>{2}; });
+    m.def("cast_rv_array", []() { return std::array<RValueCaster, 3>(); });
+    // NB: map and set keys are `const`, so while we technically do move them (as `const Type &&`),
+    // casters don't typically do anything with that, which means they fall to the `const Type &`
+    // caster.
+    m.def("cast_rv_map", []() { return std::unordered_map<std::string, RValueCaster>{{"a", RValueCaster{}}}; });
+    m.def("cast_rv_nested", []() {
+        std::vector<std::array<std::list<std::unordered_map<std::string, RValueCaster>>, 2>> v;
+        v.emplace_back(); // add an array
+        v.back()[0].emplace_back(); // add a map to the array
+        v.back()[0].back().emplace("b", RValueCaster{});
+        v.back()[0].back().emplace("c", RValueCaster{});
+        v.back()[1].emplace_back(); // add a map to the array
+        v.back()[1].back().emplace("a", RValueCaster{});
+        return v;
+    });
+    static std::array<RValueCaster, 2> lva;
+    static std::unordered_map<std::string, RValueCaster> lvm{{"a", RValueCaster{}}, {"b", RValueCaster{}}};
+    static std::unordered_map<std::string, std::vector<std::list<std::array<RValueCaster, 2>>>> lvn;
+    lvn["a"].emplace_back(); // add a list
+    lvn["a"].back().emplace_back(); // add an array
+    lvn["a"].emplace_back(); // another list
+    lvn["a"].back().emplace_back(); // add an array
+    lvn["b"].emplace_back(); // add a list
+    lvn["b"].back().emplace_back(); // add an array
+    lvn["b"].back().emplace_back(); // add another array
+    m.def("cast_lv_vector", []() -> const decltype(lvv) & { return lvv; });
+    m.def("cast_lv_array", []() -> const decltype(lva) & { return lva; });
+    m.def("cast_lv_map", []() -> const decltype(lvm) & { return lvm; });
+    m.def("cast_lv_nested", []() -> const decltype(lvn) & { return lvn; });
+    // #853:
+    m.def("cast_unique_ptr_vector", []() {
+        std::vector<std::unique_ptr<UserType>> v;
+        v.emplace_back(new UserType{7});
+        v.emplace_back(new UserType{42});
+        return v;
+    });
+
+    // test_move_out_container
+    struct MoveOutContainer {
+        struct Value { int value; };
+        std::list<Value> move_list() const { return {{0}, {1}, {2}}; }
+    };
+    py::class_<MoveOutContainer::Value>(m, "MoveOutContainerValue")
+        .def_readonly("value", &MoveOutContainer::Value::value);
+    py::class_<MoveOutContainer>(m, "MoveOutContainer")
+        .def(py::init<>())
+        .def_property_readonly("move_list", &MoveOutContainer::move_list);
+
+    // Class that can be move- and copy-constructed, but not assigned
+    struct NoAssign {
+        int value;
+
+        explicit NoAssign(int value = 0) : value(value) { }
+        NoAssign(const NoAssign &) = default;
+        NoAssign(NoAssign &&) = default;
+
+        NoAssign &operator=(const NoAssign &) = delete;
+        NoAssign &operator=(NoAssign &&) = delete;
+    };
+    py::class_<NoAssign>(m, "NoAssign", "Class with no C++ assignment operators")
+        .def(py::init<>())
+        .def(py::init<int>());
+
+#ifdef PYBIND11_HAS_OPTIONAL
+    // test_optional
+    m.attr("has_optional") = true;
+
+    using opt_int = std::optional<int>;
+    using opt_no_assign = std::optional<NoAssign>;
+    m.def("double_or_zero", [](const opt_int& x) -> int {
+        return x.value_or(0) * 2;
+    });
+    m.def("half_or_none", [](int x) -> opt_int {
+        return x ? opt_int(x / 2) : opt_int();
+    });
+    m.def("test_nullopt", [](opt_int x) {
+        return x.value_or(42);
+    }, py::arg_v("x", std::nullopt, "None"));
+    m.def("test_no_assign", [](const opt_no_assign &x) {
+        return x ? x->value : 42;
+    }, py::arg_v("x", std::nullopt, "None"));
+
+    m.def("nodefer_none_optional", [](std::optional<int>) { return true; });
+    m.def("nodefer_none_optional", [](py::none) { return false; });
+#endif
+
+#ifdef PYBIND11_HAS_EXP_OPTIONAL
+    // test_exp_optional
+    m.attr("has_exp_optional") = true;
+
+    using exp_opt_int = std::experimental::optional<int>;
+    using exp_opt_no_assign = std::experimental::optional<NoAssign>;
+    m.def("double_or_zero_exp", [](const exp_opt_int& x) -> int {
+        return x.value_or(0) * 2;
+    });
+    m.def("half_or_none_exp", [](int x) -> exp_opt_int {
+        return x ? exp_opt_int(x / 2) : exp_opt_int();
+    });
+    m.def("test_nullopt_exp", [](exp_opt_int x) {
+        return x.value_or(42);
+    }, py::arg_v("x", std::experimental::nullopt, "None"));
+    m.def("test_no_assign_exp", [](const exp_opt_no_assign &x) {
+        return x ? x->value : 42;
+    }, py::arg_v("x", std::experimental::nullopt, "None"));
+#endif
+
+#ifdef PYBIND11_HAS_VARIANT
+    static_assert(std::is_same<py::detail::variant_caster_visitor::result_type, py::handle>::value,
+                  "visitor::result_type is required by boost::variant in C++11 mode");
+
+    struct visitor {
+        using result_type = const char *;
+
+        result_type operator()(int) { return "int"; }
+        result_type operator()(std::string) { return "std::string"; }
+        result_type operator()(double) { return "double"; }
+        result_type operator()(std::nullptr_t) { return "std::nullptr_t"; }
+    };
+
+    // test_variant
+    m.def("load_variant", [](variant<int, std::string, double, std::nullptr_t> v) {
+        return py::detail::visit_helper<variant>::call(visitor(), v);
+    });
+    m.def("load_variant_2pass", [](variant<double, int> v) {
+        return py::detail::visit_helper<variant>::call(visitor(), v);
+    });
+    m.def("cast_variant", []() {
+        using V = variant<int, std::string>;
+        return py::make_tuple(V(5), V("Hello"));
+    });
+#endif
+
+    // #528: templated constructor
+    // (no python tests: the test here is that this compiles)
+    m.def("tpl_ctor_vector", [](std::vector<TplCtorClass> &) {});
+    m.def("tpl_ctor_map", [](std::unordered_map<TplCtorClass, TplCtorClass> &) {});
+    m.def("tpl_ctor_set", [](std::unordered_set<TplCtorClass> &) {});
+#if defined(PYBIND11_HAS_OPTIONAL)
+    m.def("tpl_constr_optional", [](std::optional<TplCtorClass> &) {});
+#elif defined(PYBIND11_HAS_EXP_OPTIONAL)
+    m.def("tpl_constr_optional", [](std::experimental::optional<TplCtorClass> &) {});
+#endif
+
+    // test_vec_of_reference_wrapper
+    // #171: Can't return STL structures containing reference wrapper
+    m.def("return_vec_of_reference_wrapper", [](std::reference_wrapper<UserType> p4) {
+        static UserType p1{1}, p2{2}, p3{3};
+        return std::vector<std::reference_wrapper<UserType>> {
+            std::ref(p1), std::ref(p2), std::ref(p3), p4
+        };
+    });
+
+    // test_stl_pass_by_pointer
+    m.def("stl_pass_by_pointer", [](std::vector<int>* v) { return *v; }, "v"_a=nullptr);
+
+    // #1258: pybind11/stl.h converts string to vector<string>
+    m.def("func_with_string_or_vector_string_arg_overload", [](std::vector<std::string>) { return 1; });
+    m.def("func_with_string_or_vector_string_arg_overload", [](std::list<std::string>) { return 2; });
+    m.def("func_with_string_or_vector_string_arg_overload", [](std::string) { return 3; });
+
+    class Placeholder {
+    public:
+        Placeholder() { print_created(this); }
+        Placeholder(const Placeholder &) = delete;
+        ~Placeholder() { print_destroyed(this); }
+    };
+    py::class_<Placeholder>(m, "Placeholder");
+
+    /// test_stl_vector_ownership
+    m.def("test_stl_ownership",
+          []() {
+              std::vector<Placeholder *> result;
+              result.push_back(new Placeholder());
+              return result;
+          },
+          py::return_value_policy::take_ownership);
+
+    m.def("array_cast_sequence", [](std::array<int, 3> x) { return x; });
+
+    /// test_issue_1561
+    struct Issue1561Inner { std::string data; };
+    struct Issue1561Outer { std::vector<Issue1561Inner> list; };
+
+    py::class_<Issue1561Inner>(m, "Issue1561Inner")
+        .def(py::init<std::string>())
+        .def_readwrite("data", &Issue1561Inner::data);
+
+    py::class_<Issue1561Outer>(m, "Issue1561Outer")
+        .def(py::init<>())
+        .def_readwrite("list", &Issue1561Outer::list);
+}
diff --git a/3rdparty/pybind11/tests/test_stl.py b/3rdparty/pybind11/tests/test_stl.py
new file mode 100644
index 00000000..2335cb9f
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_stl.py
@@ -0,0 +1,241 @@
+import pytest
+
+from pybind11_tests import stl as m
+from pybind11_tests import UserType
+from pybind11_tests import ConstructorStats
+
+
+def test_vector(doc):
+    """std::vector <-> list"""
+    lst = m.cast_vector()
+    assert lst == [1]
+    lst.append(2)
+    assert m.load_vector(lst)
+    assert m.load_vector(tuple(lst))
+
+    assert m.cast_bool_vector() == [True, False]
+    assert m.load_bool_vector([True, False])
+
+    assert doc(m.cast_vector) == "cast_vector() -> List[int]"
+    assert doc(m.load_vector) == "load_vector(arg0: List[int]) -> bool"
+
+    # Test regression caused by 936: pointers to stl containers weren't castable
+    assert m.cast_ptr_vector() == ["lvalue", "lvalue"]
+
+
+def test_deque(doc):
+    """std::deque <-> list"""
+    lst = m.cast_deque()
+    assert lst == [1]
+    lst.append(2)
+    assert m.load_deque(lst)
+    assert m.load_deque(tuple(lst))
+
+
+def test_array(doc):
+    """std::array <-> list"""
+    lst = m.cast_array()
+    assert lst == [1, 2]
+    assert m.load_array(lst)
+
+    assert doc(m.cast_array) == "cast_array() -> List[int[2]]"
+    assert doc(m.load_array) == "load_array(arg0: List[int[2]]) -> bool"
+
+
+def test_valarray(doc):
+    """std::valarray <-> list"""
+    lst = m.cast_valarray()
+    assert lst == [1, 4, 9]
+    assert m.load_valarray(lst)
+
+    assert doc(m.cast_valarray) == "cast_valarray() -> List[int]"
+    assert doc(m.load_valarray) == "load_valarray(arg0: List[int]) -> bool"
+
+
+def test_map(doc):
+    """std::map <-> dict"""
+    d = m.cast_map()
+    assert d == {"key": "value"}
+    assert "key" in d
+    d["key2"] = "value2"
+    assert "key2" in d
+    assert m.load_map(d)
+
+    assert doc(m.cast_map) == "cast_map() -> Dict[str, str]"
+    assert doc(m.load_map) == "load_map(arg0: Dict[str, str]) -> bool"
+
+
+def test_set(doc):
+    """std::set <-> set"""
+    s = m.cast_set()
+    assert s == {"key1", "key2"}
+    s.add("key3")
+    assert m.load_set(s)
+
+    assert doc(m.cast_set) == "cast_set() -> Set[str]"
+    assert doc(m.load_set) == "load_set(arg0: Set[str]) -> bool"
+
+
+def test_recursive_casting():
+    """Tests that stl casters preserve lvalue/rvalue context for container values"""
+    assert m.cast_rv_vector() == ["rvalue", "rvalue"]
+    assert m.cast_lv_vector() == ["lvalue", "lvalue"]
+    assert m.cast_rv_array() == ["rvalue", "rvalue", "rvalue"]
+    assert m.cast_lv_array() == ["lvalue", "lvalue"]
+    assert m.cast_rv_map() == {"a": "rvalue"}
+    assert m.cast_lv_map() == {"a": "lvalue", "b": "lvalue"}
+    assert m.cast_rv_nested() == [[[{"b": "rvalue", "c": "rvalue"}], [{"a": "rvalue"}]]]
+    assert m.cast_lv_nested() == {
+        "a": [[["lvalue", "lvalue"]], [["lvalue", "lvalue"]]],
+        "b": [[["lvalue", "lvalue"], ["lvalue", "lvalue"]]]
+    }
+
+    # Issue #853 test case:
+    z = m.cast_unique_ptr_vector()
+    assert z[0].value == 7 and z[1].value == 42
+
+
+def test_move_out_container():
+    """Properties use the `reference_internal` policy by default. If the underlying function
+    returns an rvalue, the policy is automatically changed to `move` to avoid referencing
+    a temporary. In case the return value is a container of user-defined types, the policy
+    also needs to be applied to the elements, not just the container."""
+    c = m.MoveOutContainer()
+    moved_out_list = c.move_list
+    assert [x.value for x in moved_out_list] == [0, 1, 2]
+
+
+@pytest.mark.skipif(not hasattr(m, "has_optional"), reason='no <optional>')
+def test_optional():
+    assert m.double_or_zero(None) == 0
+    assert m.double_or_zero(42) == 84
+    pytest.raises(TypeError, m.double_or_zero, 'foo')
+
+    assert m.half_or_none(0) is None
+    assert m.half_or_none(42) == 21
+    pytest.raises(TypeError, m.half_or_none, 'foo')
+
+    assert m.test_nullopt() == 42
+    assert m.test_nullopt(None) == 42
+    assert m.test_nullopt(42) == 42
+    assert m.test_nullopt(43) == 43
+
+    assert m.test_no_assign() == 42
+    assert m.test_no_assign(None) == 42
+    assert m.test_no_assign(m.NoAssign(43)) == 43
+    pytest.raises(TypeError, m.test_no_assign, 43)
+
+    assert m.nodefer_none_optional(None)
+
+
+@pytest.mark.skipif(not hasattr(m, "has_exp_optional"), reason='no <experimental/optional>')
+def test_exp_optional():
+    assert m.double_or_zero_exp(None) == 0
+    assert m.double_or_zero_exp(42) == 84
+    pytest.raises(TypeError, m.double_or_zero_exp, 'foo')
+
+    assert m.half_or_none_exp(0) is None
+    assert m.half_or_none_exp(42) == 21
+    pytest.raises(TypeError, m.half_or_none_exp, 'foo')
+
+    assert m.test_nullopt_exp() == 42
+    assert m.test_nullopt_exp(None) == 42
+    assert m.test_nullopt_exp(42) == 42
+    assert m.test_nullopt_exp(43) == 43
+
+    assert m.test_no_assign_exp() == 42
+    assert m.test_no_assign_exp(None) == 42
+    assert m.test_no_assign_exp(m.NoAssign(43)) == 43
+    pytest.raises(TypeError, m.test_no_assign_exp, 43)
+
+
+@pytest.mark.skipif(not hasattr(m, "load_variant"), reason='no <variant>')
+def test_variant(doc):
+    assert m.load_variant(1) == "int"
+    assert m.load_variant("1") == "std::string"
+    assert m.load_variant(1.0) == "double"
+    assert m.load_variant(None) == "std::nullptr_t"
+
+    assert m.load_variant_2pass(1) == "int"
+    assert m.load_variant_2pass(1.0) == "double"
+
+    assert m.cast_variant() == (5, "Hello")
+
+    assert doc(m.load_variant) == "load_variant(arg0: Union[int, str, float, None]) -> str"
+
+
+def test_vec_of_reference_wrapper():
+    """#171: Can't return reference wrappers (or STL structures containing them)"""
+    assert str(m.return_vec_of_reference_wrapper(UserType(4))) == \
+        "[UserType(1), UserType(2), UserType(3), UserType(4)]"
+
+
+def test_stl_pass_by_pointer(msg):
+    """Passing nullptr or None to an STL container pointer is not expected to work"""
+    with pytest.raises(TypeError) as excinfo:
+        m.stl_pass_by_pointer()  # default value is `nullptr`
+    assert msg(excinfo.value) == """
+        stl_pass_by_pointer(): incompatible function arguments. The following argument types are supported:
+            1. (v: List[int] = None) -> List[int]
+
+        Invoked with:
+    """  # noqa: E501 line too long
+
+    with pytest.raises(TypeError) as excinfo:
+        m.stl_pass_by_pointer(None)
+    assert msg(excinfo.value) == """
+        stl_pass_by_pointer(): incompatible function arguments. The following argument types are supported:
+            1. (v: List[int] = None) -> List[int]
+
+        Invoked with: None
+    """  # noqa: E501 line too long
+
+    assert m.stl_pass_by_pointer([1, 2, 3]) == [1, 2, 3]
+
+
+def test_missing_header_message():
+    """Trying convert `list` to a `std::vector`, or vice versa, without including
+    <pybind11/stl.h> should result in a helpful suggestion in the error message"""
+    import pybind11_cross_module_tests as cm
+
+    expected_message = ("Did you forget to `#include <pybind11/stl.h>`? Or <pybind11/complex.h>,\n"
+                        "<pybind11/functional.h>, <pybind11/chrono.h>, etc. Some automatic\n"
+                        "conversions are optional and require extra headers to be included\n"
+                        "when compiling your pybind11 module.")
+
+    with pytest.raises(TypeError) as excinfo:
+        cm.missing_header_arg([1.0, 2.0, 3.0])
+    assert expected_message in str(excinfo.value)
+
+    with pytest.raises(TypeError) as excinfo:
+        cm.missing_header_return()
+    assert expected_message in str(excinfo.value)
+
+
+def test_function_with_string_and_vector_string_arg():
+    """Check if a string is NOT implicitly converted to a list, which was the
+    behavior before fix of issue #1258"""
+    assert m.func_with_string_or_vector_string_arg_overload(('A', 'B', )) == 2
+    assert m.func_with_string_or_vector_string_arg_overload(['A', 'B']) == 2
+    assert m.func_with_string_or_vector_string_arg_overload('A') == 3
+
+
+def test_stl_ownership():
+    cstats = ConstructorStats.get(m.Placeholder)
+    assert cstats.alive() == 0
+    r = m.test_stl_ownership()
+    assert len(r) == 1
+    del r
+    assert cstats.alive() == 0
+
+
+def test_array_cast_sequence():
+    assert m.array_cast_sequence((1, 2, 3)) == [1, 2, 3]
+
+
+def test_issue_1561():
+    """ check fix for issue #1561 """
+    bar = m.Issue1561Outer()
+    bar.list = [m.Issue1561Inner('bar')]
+    bar.list
+    assert bar.list[0].data == 'bar'
diff --git a/3rdparty/pybind11/tests/test_stl_binders.cpp b/3rdparty/pybind11/tests/test_stl_binders.cpp
new file mode 100644
index 00000000..86888740
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_stl_binders.cpp
@@ -0,0 +1,129 @@
+/*
+    tests/test_stl_binders.cpp -- Usage of stl_binders functions
+
+    Copyright (c) 2016 Sergey Lyskov
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+#include <pybind11/stl_bind.h>
+#include <pybind11/numpy.h>
+#include <map>
+#include <deque>
+#include <unordered_map>
+
+class El {
+public:
+    El() = delete;
+    El(int v) : a(v) { }
+
+    int a;
+};
+
+std::ostream & operator<<(std::ostream &s, El const&v) {
+    s << "El{" << v.a << '}';
+    return s;
+}
+
+/// Issue #487: binding std::vector<E> with E non-copyable
+class E_nc {
+public:
+    explicit E_nc(int i) : value{i} {}
+    E_nc(const E_nc &) = delete;
+    E_nc &operator=(const E_nc &) = delete;
+    E_nc(E_nc &&) = default;
+    E_nc &operator=(E_nc &&) = default;
+
+    int value;
+};
+
+template <class Container> Container *one_to_n(int n) {
+    auto v = new Container();
+    for (int i = 1; i <= n; i++)
+        v->emplace_back(i);
+    return v;
+}
+
+template <class Map> Map *times_ten(int n) {
+    auto m = new Map();
+    for (int i = 1; i <= n; i++)
+        m->emplace(int(i), E_nc(10*i));
+    return m;
+}
+
+template <class NestMap> NestMap *times_hundred(int n) {
+    auto m = new NestMap();
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= n; j++)
+            (*m)[i].emplace(int(j*10), E_nc(100*j));
+    return m;
+}
+
+TEST_SUBMODULE(stl_binders, m) {
+    // test_vector_int
+    py::bind_vector<std::vector<unsigned int>>(m, "VectorInt", py::buffer_protocol());
+
+    // test_vector_custom
+    py::class_<El>(m, "El")
+        .def(py::init<int>());
+    py::bind_vector<std::vector<El>>(m, "VectorEl");
+    py::bind_vector<std::vector<std::vector<El>>>(m, "VectorVectorEl");
+
+    // test_map_string_double
+    py::bind_map<std::map<std::string, double>>(m, "MapStringDouble");
+    py::bind_map<std::unordered_map<std::string, double>>(m, "UnorderedMapStringDouble");
+
+    // test_map_string_double_const
+    py::bind_map<std::map<std::string, double const>>(m, "MapStringDoubleConst");
+    py::bind_map<std::unordered_map<std::string, double const>>(m, "UnorderedMapStringDoubleConst");
+
+    py::class_<E_nc>(m, "ENC")
+        .def(py::init<int>())
+        .def_readwrite("value", &E_nc::value);
+
+    // test_noncopyable_containers
+    py::bind_vector<std::vector<E_nc>>(m, "VectorENC");
+    m.def("get_vnc", &one_to_n<std::vector<E_nc>>, py::return_value_policy::reference);
+    py::bind_vector<std::deque<E_nc>>(m, "DequeENC");
+    m.def("get_dnc", &one_to_n<std::deque<E_nc>>, py::return_value_policy::reference);
+    py::bind_map<std::map<int, E_nc>>(m, "MapENC");
+    m.def("get_mnc", &times_ten<std::map<int, E_nc>>, py::return_value_policy::reference);
+    py::bind_map<std::unordered_map<int, E_nc>>(m, "UmapENC");
+    m.def("get_umnc", &times_ten<std::unordered_map<int, E_nc>>, py::return_value_policy::reference);
+    // Issue #1885: binding nested std::map<X, Container<E>> with E non-copyable
+    py::bind_map<std::map<int, std::vector<E_nc>>>(m, "MapVecENC");
+    m.def("get_nvnc", [](int n)
+        {
+            auto m = new std::map<int, std::vector<E_nc>>();
+            for (int i = 1; i <= n; i++)
+                for (int j = 1; j <= n; j++)
+                    (*m)[i].emplace_back(j);
+            return m;
+        }, py::return_value_policy::reference);
+    py::bind_map<std::map<int, std::map<int, E_nc>>>(m, "MapMapENC");
+    m.def("get_nmnc", &times_hundred<std::map<int, std::map<int, E_nc>>>, py::return_value_policy::reference);
+    py::bind_map<std::unordered_map<int, std::unordered_map<int, E_nc>>>(m, "UmapUmapENC");
+    m.def("get_numnc", &times_hundred<std::unordered_map<int, std::unordered_map<int, E_nc>>>, py::return_value_policy::reference);
+
+    // test_vector_buffer
+    py::bind_vector<std::vector<unsigned char>>(m, "VectorUChar", py::buffer_protocol());
+    // no dtype declared for this version:
+    struct VUndeclStruct { bool w; uint32_t x; double y; bool z; };
+    m.def("create_undeclstruct", [m] () mutable {
+        py::bind_vector<std::vector<VUndeclStruct>>(m, "VectorUndeclStruct", py::buffer_protocol());
+    });
+
+    // The rest depends on numpy:
+    try { py::module::import("numpy"); }
+    catch (...) { return; }
+
+    // test_vector_buffer_numpy
+    struct VStruct { bool w; uint32_t x; double y; bool z; };
+    PYBIND11_NUMPY_DTYPE(VStruct, w, x, y, z);
+    py::class_<VStruct>(m, "VStruct").def_readwrite("x", &VStruct::x);
+    py::bind_vector<std::vector<VStruct>>(m, "VectorStruct", py::buffer_protocol());
+    m.def("get_vectorstruct", [] {return std::vector<VStruct> {{0, 5, 3.0, 1}, {1, 30, -1e4, 0}};});
+}
diff --git a/3rdparty/pybind11/tests/test_stl_binders.py b/3rdparty/pybind11/tests/test_stl_binders.py
new file mode 100644
index 00000000..c7b7e853
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_stl_binders.py
@@ -0,0 +1,276 @@
+import pytest
+import sys
+from pybind11_tests import stl_binders as m
+
+with pytest.suppress(ImportError):
+    import numpy as np
+
+
+def test_vector_int():
+    v_int = m.VectorInt([0, 0])
+    assert len(v_int) == 2
+    assert bool(v_int) is True
+
+    # test construction from a generator
+    v_int1 = m.VectorInt(x for x in range(5))
+    assert v_int1 == m.VectorInt([0, 1, 2, 3, 4])
+
+    v_int2 = m.VectorInt([0, 0])
+    assert v_int == v_int2
+    v_int2[1] = 1
+    assert v_int != v_int2
+
+    v_int2.append(2)
+    v_int2.insert(0, 1)
+    v_int2.insert(0, 2)
+    v_int2.insert(0, 3)
+    v_int2.insert(6, 3)
+    assert str(v_int2) == "VectorInt[3, 2, 1, 0, 1, 2, 3]"
+    with pytest.raises(IndexError):
+        v_int2.insert(8, 4)
+
+    v_int.append(99)
+    v_int2[2:-2] = v_int
+    assert v_int2 == m.VectorInt([3, 2, 0, 0, 99, 2, 3])
+    del v_int2[1:3]
+    assert v_int2 == m.VectorInt([3, 0, 99, 2, 3])
+    del v_int2[0]
+    assert v_int2 == m.VectorInt([0, 99, 2, 3])
+
+    v_int2.extend(m.VectorInt([4, 5]))
+    assert v_int2 == m.VectorInt([0, 99, 2, 3, 4, 5])
+
+    v_int2.extend([6, 7])
+    assert v_int2 == m.VectorInt([0, 99, 2, 3, 4, 5, 6, 7])
+
+    # test error handling, and that the vector is unchanged
+    with pytest.raises(RuntimeError):
+        v_int2.extend([8, 'a'])
+
+    assert v_int2 == m.VectorInt([0, 99, 2, 3, 4, 5, 6, 7])
+
+    # test extending from a generator
+    v_int2.extend(x for x in range(5))
+    assert v_int2 == m.VectorInt([0, 99, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4])
+
+    # test negative indexing
+    assert v_int2[-1] == 4
+
+    # insert with negative index
+    v_int2.insert(-1, 88)
+    assert v_int2 == m.VectorInt([0, 99, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 88, 4])
+
+    # delete negative index
+    del v_int2[-1]
+    assert v_int2 == m.VectorInt([0, 99, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 88])
+
+    v_int2.clear()
+    assert len(v_int2) == 0
+
+# related to the PyPy's buffer protocol.
+@pytest.unsupported_on_pypy
+def test_vector_buffer():
+    b = bytearray([1, 2, 3, 4])
+    v = m.VectorUChar(b)
+    assert v[1] == 2
+    v[2] = 5
+    mv = memoryview(v)  # We expose the buffer interface
+    if sys.version_info.major > 2:
+        assert mv[2] == 5
+        mv[2] = 6
+    else:
+        assert mv[2] == '\x05'
+        mv[2] = '\x06'
+    assert v[2] == 6
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.create_undeclstruct()  # Undeclared struct contents, no buffer interface
+    assert "NumPy type info missing for " in str(excinfo.value)
+
+
+@pytest.unsupported_on_pypy
+@pytest.requires_numpy
+def test_vector_buffer_numpy():
+    a = np.array([1, 2, 3, 4], dtype=np.int32)
+    with pytest.raises(TypeError):
+        m.VectorInt(a)
+
+    a = np.array([[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]], dtype=np.uintc)
+    v = m.VectorInt(a[0, :])
+    assert len(v) == 4
+    assert v[2] == 3
+    ma = np.asarray(v)
+    ma[2] = 5
+    assert v[2] == 5
+
+    v = m.VectorInt(a[:, 1])
+    assert len(v) == 3
+    assert v[2] == 10
+
+    v = m.get_vectorstruct()
+    assert v[0].x == 5
+    ma = np.asarray(v)
+    ma[1]['x'] = 99
+    assert v[1].x == 99
+
+    v = m.VectorStruct(np.zeros(3, dtype=np.dtype([('w', 'bool'), ('x', 'I'),
+                                                   ('y', 'float64'), ('z', 'bool')], align=True)))
+    assert len(v) == 3
+
+
+def test_vector_bool():
+    import pybind11_cross_module_tests as cm
+
+    vv_c = cm.VectorBool()
+    for i in range(10):
+        vv_c.append(i % 2 == 0)
+    for i in range(10):
+        assert vv_c[i] == (i % 2 == 0)
+    assert str(vv_c) == "VectorBool[1, 0, 1, 0, 1, 0, 1, 0, 1, 0]"
+
+
+def test_vector_custom():
+    v_a = m.VectorEl()
+    v_a.append(m.El(1))
+    v_a.append(m.El(2))
+    assert str(v_a) == "VectorEl[El{1}, El{2}]"
+
+    vv_a = m.VectorVectorEl()
+    vv_a.append(v_a)
+    vv_b = vv_a[0]
+    assert str(vv_b) == "VectorEl[El{1}, El{2}]"
+
+
+def test_map_string_double():
+    mm = m.MapStringDouble()
+    mm['a'] = 1
+    mm['b'] = 2.5
+
+    assert list(mm) == ['a', 'b']
+    assert list(mm.items()) == [('a', 1), ('b', 2.5)]
+    assert str(mm) == "MapStringDouble{a: 1, b: 2.5}"
+
+    um = m.UnorderedMapStringDouble()
+    um['ua'] = 1.1
+    um['ub'] = 2.6
+
+    assert sorted(list(um)) == ['ua', 'ub']
+    assert sorted(list(um.items())) == [('ua', 1.1), ('ub', 2.6)]
+    assert "UnorderedMapStringDouble" in str(um)
+
+
+def test_map_string_double_const():
+    mc = m.MapStringDoubleConst()
+    mc['a'] = 10
+    mc['b'] = 20.5
+    assert str(mc) == "MapStringDoubleConst{a: 10, b: 20.5}"
+
+    umc = m.UnorderedMapStringDoubleConst()
+    umc['a'] = 11
+    umc['b'] = 21.5
+
+    str(umc)
+
+
+def test_noncopyable_containers():
+    # std::vector
+    vnc = m.get_vnc(5)
+    for i in range(0, 5):
+        assert vnc[i].value == i + 1
+
+    for i, j in enumerate(vnc, start=1):
+        assert j.value == i
+
+    # std::deque
+    dnc = m.get_dnc(5)
+    for i in range(0, 5):
+        assert dnc[i].value == i + 1
+
+    i = 1
+    for j in dnc:
+        assert(j.value == i)
+        i += 1
+
+    # std::map
+    mnc = m.get_mnc(5)
+    for i in range(1, 6):
+        assert mnc[i].value == 10 * i
+
+    vsum = 0
+    for k, v in mnc.items():
+        assert v.value == 10 * k
+        vsum += v.value
+
+    assert vsum == 150
+
+    # std::unordered_map
+    mnc = m.get_umnc(5)
+    for i in range(1, 6):
+        assert mnc[i].value == 10 * i
+
+    vsum = 0
+    for k, v in mnc.items():
+        assert v.value == 10 * k
+        vsum += v.value
+
+    assert vsum == 150
+
+    # nested std::map<std::vector>
+    nvnc = m.get_nvnc(5)
+    for i in range(1, 6):
+        for j in range(0, 5):
+            assert nvnc[i][j].value == j + 1
+
+    for k, v in nvnc.items():
+        for i, j in enumerate(v, start=1):
+            assert j.value == i
+
+    # nested std::map<std::map>
+    nmnc = m.get_nmnc(5)
+    for i in range(1, 6):
+        for j in range(10, 60, 10):
+            assert nmnc[i][j].value == 10 * j
+
+    vsum = 0
+    for k_o, v_o in nmnc.items():
+        for k_i, v_i in v_o.items():
+            assert v_i.value == 10 * k_i
+            vsum += v_i.value
+
+    assert vsum == 7500
+
+    # nested std::unordered_map<std::unordered_map>
+    numnc = m.get_numnc(5)
+    for i in range(1, 6):
+        for j in range(10, 60, 10):
+            assert numnc[i][j].value == 10 * j
+
+    vsum = 0
+    for k_o, v_o in numnc.items():
+        for k_i, v_i in v_o.items():
+            assert v_i.value == 10 * k_i
+            vsum += v_i.value
+
+    assert vsum == 7500
+
+
+def test_map_delitem():
+    mm = m.MapStringDouble()
+    mm['a'] = 1
+    mm['b'] = 2.5
+
+    assert list(mm) == ['a', 'b']
+    assert list(mm.items()) == [('a', 1), ('b', 2.5)]
+    del mm['a']
+    assert list(mm) == ['b']
+    assert list(mm.items()) == [('b', 2.5)]
+
+    um = m.UnorderedMapStringDouble()
+    um['ua'] = 1.1
+    um['ub'] = 2.6
+
+    assert sorted(list(um)) == ['ua', 'ub']
+    assert sorted(list(um.items())) == [('ua', 1.1), ('ub', 2.6)]
+    del um['ua']
+    assert sorted(list(um)) == ['ub']
+    assert sorted(list(um.items())) == [('ub', 2.6)]
diff --git a/3rdparty/pybind11/tests/test_tagbased_polymorphic.cpp b/3rdparty/pybind11/tests/test_tagbased_polymorphic.cpp
new file mode 100644
index 00000000..272e460c
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_tagbased_polymorphic.cpp
@@ -0,0 +1,136 @@
+/*
+    tests/test_tagbased_polymorphic.cpp -- test of polymorphic_type_hook
+
+    Copyright (c) 2018 Hudson River Trading LLC <opensource@hudson-trading.com>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/stl.h>
+
+struct Animal
+{
+    enum class Kind {
+        Unknown = 0,
+        Dog = 100, Labrador, Chihuahua, LastDog = 199,
+        Cat = 200, Panther, LastCat = 299
+    };
+    static const std::type_info* type_of_kind(Kind kind);
+    static std::string name_of_kind(Kind kind);
+
+    const Kind kind;
+    const std::string name;
+
+  protected:
+    Animal(const std::string& _name, Kind _kind)
+        : kind(_kind), name(_name)
+    {}
+};
+
+struct Dog : Animal
+{
+    Dog(const std::string& _name, Kind _kind = Kind::Dog) : Animal(_name, _kind) {}
+    std::string bark() const { return name_of_kind(kind) + " " + name + " goes " + sound; }
+    std::string sound = "WOOF!";
+};
+
+struct Labrador : Dog
+{
+    Labrador(const std::string& _name, int _excitement = 9001)
+        : Dog(_name, Kind::Labrador), excitement(_excitement) {}
+    int excitement;
+};
+
+struct Chihuahua : Dog
+{
+    Chihuahua(const std::string& _name) : Dog(_name, Kind::Chihuahua) { sound = "iyiyiyiyiyi"; }
+    std::string bark() const { return Dog::bark() + " and runs in circles"; }
+};
+
+struct Cat : Animal
+{
+    Cat(const std::string& _name, Kind _kind = Kind::Cat) : Animal(_name, _kind) {}
+    std::string purr() const { return "mrowr"; }
+};
+
+struct Panther : Cat
+{
+    Panther(const std::string& _name) : Cat(_name, Kind::Panther) {}
+    std::string purr() const { return "mrrrRRRRRR"; }
+};
+
+std::vector<std::unique_ptr<Animal>> create_zoo()
+{
+    std::vector<std::unique_ptr<Animal>> ret;
+    ret.emplace_back(new Labrador("Fido", 15000));
+
+    // simulate some new type of Dog that the Python bindings
+    // haven't been updated for; it should still be considered
+    // a Dog, not just an Animal.
+    ret.emplace_back(new Dog("Ginger", Dog::Kind(150)));
+
+    ret.emplace_back(new Chihuahua("Hertzl"));
+    ret.emplace_back(new Cat("Tiger", Cat::Kind::Cat));
+    ret.emplace_back(new Panther("Leo"));
+    return ret;
+}
+
+const std::type_info* Animal::type_of_kind(Kind kind)
+{
+    switch (kind) {
+        case Kind::Unknown: break;
+
+        case Kind::Dog: break;
+        case Kind::Labrador: return &typeid(Labrador);
+        case Kind::Chihuahua: return &typeid(Chihuahua);
+        case Kind::LastDog: break;
+
+        case Kind::Cat: break;
+        case Kind::Panther: return &typeid(Panther);
+        case Kind::LastCat: break;
+    }
+
+    if (kind >= Kind::Dog && kind <= Kind::LastDog) return &typeid(Dog);
+    if (kind >= Kind::Cat && kind <= Kind::LastCat) return &typeid(Cat);
+    return nullptr;
+}
+
+std::string Animal::name_of_kind(Kind kind)
+{
+    std::string raw_name = type_of_kind(kind)->name();
+    py::detail::clean_type_id(raw_name);
+    return raw_name;
+}
+
+namespace pybind11 {
+    template <typename itype>
+    struct polymorphic_type_hook<itype, detail::enable_if_t<std::is_base_of<Animal, itype>::value>>
+    {
+        static const void *get(const itype *src, const std::type_info*& type)
+        { type = src ? Animal::type_of_kind(src->kind) : nullptr; return src; }
+    };
+}
+
+TEST_SUBMODULE(tagbased_polymorphic, m) {
+    py::class_<Animal>(m, "Animal")
+        .def_readonly("name", &Animal::name);
+    py::class_<Dog, Animal>(m, "Dog")
+        .def(py::init<std::string>())
+        .def_readwrite("sound", &Dog::sound)
+        .def("bark", &Dog::bark);
+    py::class_<Labrador, Dog>(m, "Labrador")
+        .def(py::init<std::string, int>(), "name"_a, "excitement"_a = 9001)
+        .def_readwrite("excitement", &Labrador::excitement);
+    py::class_<Chihuahua, Dog>(m, "Chihuahua")
+        .def(py::init<std::string>())
+        .def("bark", &Chihuahua::bark);
+    py::class_<Cat, Animal>(m, "Cat")
+        .def(py::init<std::string>())
+        .def("purr", &Cat::purr);
+    py::class_<Panther, Cat>(m, "Panther")
+        .def(py::init<std::string>())
+        .def("purr", &Panther::purr);
+    m.def("create_zoo", &create_zoo);
+};
diff --git a/3rdparty/pybind11/tests/test_tagbased_polymorphic.py b/3rdparty/pybind11/tests/test_tagbased_polymorphic.py
new file mode 100644
index 00000000..2574d7de
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_tagbased_polymorphic.py
@@ -0,0 +1,20 @@
+from pybind11_tests import tagbased_polymorphic as m
+
+
+def test_downcast():
+    zoo = m.create_zoo()
+    assert [type(animal) for animal in zoo] == [
+        m.Labrador, m.Dog, m.Chihuahua, m.Cat, m.Panther
+    ]
+    assert [animal.name for animal in zoo] == [
+        "Fido", "Ginger", "Hertzl", "Tiger", "Leo"
+    ]
+    zoo[1].sound = "woooooo"
+    assert [dog.bark() for dog in zoo[:3]] == [
+        "Labrador Fido goes WOOF!",
+        "Dog Ginger goes woooooo",
+        "Chihuahua Hertzl goes iyiyiyiyiyi and runs in circles"
+    ]
+    assert [cat.purr() for cat in zoo[3:]] == ["mrowr", "mrrrRRRRRR"]
+    zoo[0].excitement -= 1000
+    assert zoo[0].excitement == 14000
diff --git a/3rdparty/pybind11/tests/test_union.cpp b/3rdparty/pybind11/tests/test_union.cpp
new file mode 100644
index 00000000..7b98ea21
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_union.cpp
@@ -0,0 +1,22 @@
+/*
+    tests/test_class.cpp -- test py::class_ definitions and basic functionality
+
+    Copyright (c) 2019 Roland Dreier <roland.dreier@gmail.com>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+
+TEST_SUBMODULE(union_, m) {
+    union TestUnion {
+        int value_int;
+        unsigned value_uint;
+    };
+
+    py::class_<TestUnion>(m, "TestUnion")
+        .def(py::init<>())
+        .def_readonly("as_int", &TestUnion::value_int)
+        .def_readwrite("as_uint", &TestUnion::value_uint);
+}
diff --git a/3rdparty/pybind11/tests/test_union.py b/3rdparty/pybind11/tests/test_union.py
new file mode 100644
index 00000000..e1866e70
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_union.py
@@ -0,0 +1,8 @@
+from pybind11_tests import union_ as m
+
+
+def test_union():
+    instance = m.TestUnion()
+
+    instance.as_uint = 10
+    assert instance.as_int == 10
diff --git a/3rdparty/pybind11/tests/test_virtual_functions.cpp b/3rdparty/pybind11/tests/test_virtual_functions.cpp
new file mode 100644
index 00000000..ccf018d9
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_virtual_functions.cpp
@@ -0,0 +1,479 @@
+/*
+    tests/test_virtual_functions.cpp -- overriding virtual functions from Python
+
+    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include "constructor_stats.h"
+#include <pybind11/functional.h>
+#include <thread>
+
+/* This is an example class that we'll want to be able to extend from Python */
+class ExampleVirt  {
+public:
+    ExampleVirt(int state) : state(state) { print_created(this, state); }
+    ExampleVirt(const ExampleVirt &e) : state(e.state) { print_copy_created(this); }
+    ExampleVirt(ExampleVirt &&e) : state(e.state) { print_move_created(this); e.state = 0; }
+    virtual ~ExampleVirt() { print_destroyed(this); }
+
+    virtual int run(int value) {
+        py::print("Original implementation of "
+                  "ExampleVirt::run(state={}, value={}, str1={}, str2={})"_s.format(state, value, get_string1(), *get_string2()));
+        return state + value;
+    }
+
+    virtual bool run_bool() = 0;
+    virtual void pure_virtual() = 0;
+
+    // Returning a reference/pointer to a type converted from python (numbers, strings, etc.) is a
+    // bit trickier, because the actual int& or std::string& or whatever only exists temporarily, so
+    // we have to handle it specially in the trampoline class (see below).
+    virtual const std::string &get_string1() { return str1; }
+    virtual const std::string *get_string2() { return &str2; }
+
+private:
+    int state;
+    const std::string str1{"default1"}, str2{"default2"};
+};
+
+/* This is a wrapper class that must be generated */
+class PyExampleVirt : public ExampleVirt {
+public:
+    using ExampleVirt::ExampleVirt; /* Inherit constructors */
+
+    int run(int value) override {
+        /* Generate wrapping code that enables native function overloading */
+        PYBIND11_OVERLOAD(
+            int,         /* Return type */
+            ExampleVirt, /* Parent class */
+            run,         /* Name of function */
+            value        /* Argument(s) */
+        );
+    }
+
+    bool run_bool() override {
+        PYBIND11_OVERLOAD_PURE(
+            bool,         /* Return type */
+            ExampleVirt,  /* Parent class */
+            run_bool,     /* Name of function */
+                          /* This function has no arguments. The trailing comma
+                             in the previous line is needed for some compilers */
+        );
+    }
+
+    void pure_virtual() override {
+        PYBIND11_OVERLOAD_PURE(
+            void,         /* Return type */
+            ExampleVirt,  /* Parent class */
+            pure_virtual, /* Name of function */
+                          /* This function has no arguments. The trailing comma
+                             in the previous line is needed for some compilers */
+        );
+    }
+
+    // We can return reference types for compatibility with C++ virtual interfaces that do so, but
+    // note they have some significant limitations (see the documentation).
+    const std::string &get_string1() override {
+        PYBIND11_OVERLOAD(
+            const std::string &, /* Return type */
+            ExampleVirt,         /* Parent class */
+            get_string1,         /* Name of function */
+                                 /* (no arguments) */
+        );
+    }
+
+    const std::string *get_string2() override {
+        PYBIND11_OVERLOAD(
+            const std::string *, /* Return type */
+            ExampleVirt,         /* Parent class */
+            get_string2,         /* Name of function */
+                                 /* (no arguments) */
+        );
+    }
+
+};
+
+class NonCopyable {
+public:
+    NonCopyable(int a, int b) : value{new int(a*b)} { print_created(this, a, b); }
+    NonCopyable(NonCopyable &&o) { value = std::move(o.value); print_move_created(this); }
+    NonCopyable(const NonCopyable &) = delete;
+    NonCopyable() = delete;
+    void operator=(const NonCopyable &) = delete;
+    void operator=(NonCopyable &&) = delete;
+    std::string get_value() const {
+        if (value) return std::to_string(*value); else return "(null)";
+    }
+    ~NonCopyable() { print_destroyed(this); }
+
+private:
+    std::unique_ptr<int> value;
+};
+
+// This is like the above, but is both copy and movable.  In effect this means it should get moved
+// when it is not referenced elsewhere, but copied if it is still referenced.
+class Movable {
+public:
+    Movable(int a, int b) : value{a+b} { print_created(this, a, b); }
+    Movable(const Movable &m) { value = m.value; print_copy_created(this); }
+    Movable(Movable &&m) { value = std::move(m.value); print_move_created(this); }
+    std::string get_value() const { return std::to_string(value); }
+    ~Movable() { print_destroyed(this); }
+private:
+    int value;
+};
+
+class NCVirt {
+public:
+    virtual ~NCVirt() { }
+    virtual NonCopyable get_noncopyable(int a, int b) { return NonCopyable(a, b); }
+    virtual Movable get_movable(int a, int b) = 0;
+
+    std::string print_nc(int a, int b) { return get_noncopyable(a, b).get_value(); }
+    std::string print_movable(int a, int b) { return get_movable(a, b).get_value(); }
+};
+class NCVirtTrampoline : public NCVirt {
+#if !defined(__INTEL_COMPILER)
+    NonCopyable get_noncopyable(int a, int b) override {
+        PYBIND11_OVERLOAD(NonCopyable, NCVirt, get_noncopyable, a, b);
+    }
+#endif
+    Movable get_movable(int a, int b) override {
+        PYBIND11_OVERLOAD_PURE(Movable, NCVirt, get_movable, a, b);
+    }
+};
+
+struct Base {
+    /* for some reason MSVC2015 can't compile this if the function is pure virtual */
+    virtual std::string dispatch() const { return {}; };
+    virtual ~Base() = default;
+};
+
+struct DispatchIssue : Base {
+    virtual std::string dispatch() const {
+        PYBIND11_OVERLOAD_PURE(std::string, Base, dispatch, /* no arguments */);
+    }
+};
+
+static void test_gil() {
+    {
+        py::gil_scoped_acquire lock;
+        py::print("1st lock acquired");
+
+    }
+
+    {
+        py::gil_scoped_acquire lock;
+        py::print("2nd lock acquired");
+    }
+
+}
+
+static void test_gil_from_thread() {
+    py::gil_scoped_release release;
+
+    std::thread t(test_gil);
+    t.join();
+}
+
+
+// Forward declaration (so that we can put the main tests here; the inherited virtual approaches are
+// rather long).
+void initialize_inherited_virtuals(py::module &m);
+
+TEST_SUBMODULE(virtual_functions, m) {
+    // test_override
+    py::class_<ExampleVirt, PyExampleVirt>(m, "ExampleVirt")
+        .def(py::init<int>())
+        /* Reference original class in function definitions */
+        .def("run", &ExampleVirt::run)
+        .def("run_bool", &ExampleVirt::run_bool)
+        .def("pure_virtual", &ExampleVirt::pure_virtual);
+
+    py::class_<NonCopyable>(m, "NonCopyable")
+        .def(py::init<int, int>());
+
+    py::class_<Movable>(m, "Movable")
+        .def(py::init<int, int>());
+
+    // test_move_support
+#if !defined(__INTEL_COMPILER)
+    py::class_<NCVirt, NCVirtTrampoline>(m, "NCVirt")
+        .def(py::init<>())
+        .def("get_noncopyable", &NCVirt::get_noncopyable)
+        .def("get_movable", &NCVirt::get_movable)
+        .def("print_nc", &NCVirt::print_nc)
+        .def("print_movable", &NCVirt::print_movable);
+#endif
+
+    m.def("runExampleVirt", [](ExampleVirt *ex, int value) { return ex->run(value); });
+    m.def("runExampleVirtBool", [](ExampleVirt* ex) { return ex->run_bool(); });
+    m.def("runExampleVirtVirtual", [](ExampleVirt *ex) { ex->pure_virtual(); });
+
+    m.def("cstats_debug", &ConstructorStats::get<ExampleVirt>);
+    initialize_inherited_virtuals(m);
+
+    // test_alias_delay_initialization1
+    // don't invoke Python dispatch classes by default when instantiating C++ classes
+    // that were not extended on the Python side
+    struct A {
+        virtual ~A() {}
+        virtual void f() { py::print("A.f()"); }
+    };
+
+    struct PyA : A {
+        PyA() { py::print("PyA.PyA()"); }
+        ~PyA() { py::print("PyA.~PyA()"); }
+
+        void f() override {
+            py::print("PyA.f()");
+            // This convolution just gives a `void`, but tests that PYBIND11_TYPE() works to protect
+            // a type containing a ,
+            PYBIND11_OVERLOAD(PYBIND11_TYPE(typename std::enable_if<true, void>::type), A, f);
+        }
+    };
+
+    py::class_<A, PyA>(m, "A")
+        .def(py::init<>())
+        .def("f", &A::f);
+
+    m.def("call_f", [](A *a) { a->f(); });
+
+    // test_alias_delay_initialization2
+    // ... unless we explicitly request it, as in this example:
+    struct A2 {
+        virtual ~A2() {}
+        virtual void f() { py::print("A2.f()"); }
+    };
+
+    struct PyA2 : A2 {
+        PyA2() { py::print("PyA2.PyA2()"); }
+        ~PyA2() { py::print("PyA2.~PyA2()"); }
+        void f() override {
+            py::print("PyA2.f()");
+            PYBIND11_OVERLOAD(void, A2, f);
+        }
+    };
+
+    py::class_<A2, PyA2>(m, "A2")
+        .def(py::init_alias<>())
+        .def(py::init([](int) { return new PyA2(); }))
+        .def("f", &A2::f);
+
+    m.def("call_f", [](A2 *a2) { a2->f(); });
+
+    // test_dispatch_issue
+    // #159: virtual function dispatch has problems with similar-named functions
+    py::class_<Base, DispatchIssue>(m, "DispatchIssue")
+        .def(py::init<>())
+        .def("dispatch", &Base::dispatch);
+
+    m.def("dispatch_issue_go", [](const Base * b) { return b->dispatch(); });
+
+    // test_override_ref
+    // #392/397: overriding reference-returning functions
+    class OverrideTest {
+    public:
+        struct A { std::string value = "hi"; };
+        std::string v;
+        A a;
+        explicit OverrideTest(const std::string &v) : v{v} {}
+        virtual std::string str_value() { return v; }
+        virtual std::string &str_ref() { return v; }
+        virtual A A_value() { return a; }
+        virtual A &A_ref() { return a; }
+        virtual ~OverrideTest() = default;
+    };
+
+    class PyOverrideTest : public OverrideTest {
+    public:
+        using OverrideTest::OverrideTest;
+        std::string str_value() override { PYBIND11_OVERLOAD(std::string, OverrideTest, str_value); }
+        // Not allowed (uncommenting should hit a static_assert failure): we can't get a reference
+        // to a python numeric value, since we only copy values in the numeric type caster:
+//      std::string &str_ref() override { PYBIND11_OVERLOAD(std::string &, OverrideTest, str_ref); }
+        // But we can work around it like this:
+    private:
+        std::string _tmp;
+        std::string str_ref_helper() { PYBIND11_OVERLOAD(std::string, OverrideTest, str_ref); }
+    public:
+        std::string &str_ref() override { return _tmp = str_ref_helper(); }
+
+        A A_value() override { PYBIND11_OVERLOAD(A, OverrideTest, A_value); }
+        A &A_ref() override { PYBIND11_OVERLOAD(A &, OverrideTest, A_ref); }
+    };
+
+    py::class_<OverrideTest::A>(m, "OverrideTest_A")
+        .def_readwrite("value", &OverrideTest::A::value);
+    py::class_<OverrideTest, PyOverrideTest>(m, "OverrideTest")
+        .def(py::init<const std::string &>())
+        .def("str_value", &OverrideTest::str_value)
+//      .def("str_ref", &OverrideTest::str_ref)
+        .def("A_value", &OverrideTest::A_value)
+        .def("A_ref", &OverrideTest::A_ref);
+}
+
+
+// Inheriting virtual methods.  We do two versions here: the repeat-everything version and the
+// templated trampoline versions mentioned in docs/advanced.rst.
+//
+// These base classes are exactly the same, but we technically need distinct
+// classes for this example code because we need to be able to bind them
+// properly (pybind11, sensibly, doesn't allow us to bind the same C++ class to
+// multiple python classes).
+class A_Repeat {
+#define A_METHODS \
+public: \
+    virtual int unlucky_number() = 0; \
+    virtual std::string say_something(unsigned times) { \
+        std::string s = ""; \
+        for (unsigned i = 0; i < times; ++i) \
+            s += "hi"; \
+        return s; \
+    } \
+    std::string say_everything() { \
+        return say_something(1) + " " + std::to_string(unlucky_number()); \
+    }
+A_METHODS
+    virtual ~A_Repeat() = default;
+};
+class B_Repeat : public A_Repeat {
+#define B_METHODS \
+public: \
+    int unlucky_number() override { return 13; } \
+    std::string say_something(unsigned times) override { \
+        return "B says hi " + std::to_string(times) + " times"; \
+    } \
+    virtual double lucky_number() { return 7.0; }
+B_METHODS
+};
+class C_Repeat : public B_Repeat {
+#define C_METHODS \
+public: \
+    int unlucky_number() override { return 4444; } \
+    double lucky_number() override { return 888; }
+C_METHODS
+};
+class D_Repeat : public C_Repeat {
+#define D_METHODS // Nothing overridden.
+D_METHODS
+};
+
+// Base classes for templated inheritance trampolines.  Identical to the repeat-everything version:
+class A_Tpl { A_METHODS; virtual ~A_Tpl() = default; };
+class B_Tpl : public A_Tpl { B_METHODS };
+class C_Tpl : public B_Tpl { C_METHODS };
+class D_Tpl : public C_Tpl { D_METHODS };
+
+
+// Inheritance approach 1: each trampoline gets every virtual method (11 in total)
+class PyA_Repeat : public A_Repeat {
+public:
+    using A_Repeat::A_Repeat;
+    int unlucky_number() override { PYBIND11_OVERLOAD_PURE(int, A_Repeat, unlucky_number, ); }
+    std::string say_something(unsigned times) override { PYBIND11_OVERLOAD(std::string, A_Repeat, say_something, times); }
+};
+class PyB_Repeat : public B_Repeat {
+public:
+    using B_Repeat::B_Repeat;
+    int unlucky_number() override { PYBIND11_OVERLOAD(int, B_Repeat, unlucky_number, ); }
+    std::string say_something(unsigned times) override { PYBIND11_OVERLOAD(std::string, B_Repeat, say_something, times); }
+    double lucky_number() override { PYBIND11_OVERLOAD(double, B_Repeat, lucky_number, ); }
+};
+class PyC_Repeat : public C_Repeat {
+public:
+    using C_Repeat::C_Repeat;
+    int unlucky_number() override { PYBIND11_OVERLOAD(int, C_Repeat, unlucky_number, ); }
+    std::string say_something(unsigned times) override { PYBIND11_OVERLOAD(std::string, C_Repeat, say_something, times); }
+    double lucky_number() override { PYBIND11_OVERLOAD(double, C_Repeat, lucky_number, ); }
+};
+class PyD_Repeat : public D_Repeat {
+public:
+    using D_Repeat::D_Repeat;
+    int unlucky_number() override { PYBIND11_OVERLOAD(int, D_Repeat, unlucky_number, ); }
+    std::string say_something(unsigned times) override { PYBIND11_OVERLOAD(std::string, D_Repeat, say_something, times); }
+    double lucky_number() override { PYBIND11_OVERLOAD(double, D_Repeat, lucky_number, ); }
+};
+
+// Inheritance approach 2: templated trampoline classes.
+//
+// Advantages:
+// - we have only 2 (template) class and 4 method declarations (one per virtual method, plus one for
+//   any override of a pure virtual method), versus 4 classes and 6 methods (MI) or 4 classes and 11
+//   methods (repeat).
+// - Compared to MI, we also don't have to change the non-trampoline inheritance to virtual, and can
+//   properly inherit constructors.
+//
+// Disadvantage:
+// - the compiler must still generate and compile 14 different methods (more, even, than the 11
+//   required for the repeat approach) instead of the 6 required for MI.  (If there was no pure
+//   method (or no pure method override), the number would drop down to the same 11 as the repeat
+//   approach).
+template <class Base = A_Tpl>
+class PyA_Tpl : public Base {
+public:
+    using Base::Base; // Inherit constructors
+    int unlucky_number() override { PYBIND11_OVERLOAD_PURE(int, Base, unlucky_number, ); }
+    std::string say_something(unsigned times) override { PYBIND11_OVERLOAD(std::string, Base, say_something, times); }
+};
+template <class Base = B_Tpl>
+class PyB_Tpl : public PyA_Tpl<Base> {
+public:
+    using PyA_Tpl<Base>::PyA_Tpl; // Inherit constructors (via PyA_Tpl's inherited constructors)
+    int unlucky_number() override { PYBIND11_OVERLOAD(int, Base, unlucky_number, ); }
+    double lucky_number() override { PYBIND11_OVERLOAD(double, Base, lucky_number, ); }
+};
+// Since C_Tpl and D_Tpl don't declare any new virtual methods, we don't actually need these (we can
+// use PyB_Tpl<C_Tpl> and PyB_Tpl<D_Tpl> for the trampoline classes instead):
+/*
+template <class Base = C_Tpl> class PyC_Tpl : public PyB_Tpl<Base> {
+public:
+    using PyB_Tpl<Base>::PyB_Tpl;
+};
+template <class Base = D_Tpl> class PyD_Tpl : public PyC_Tpl<Base> {
+public:
+    using PyC_Tpl<Base>::PyC_Tpl;
+};
+*/
+
+void initialize_inherited_virtuals(py::module &m) {
+    // test_inherited_virtuals
+
+    // Method 1: repeat
+    py::class_<A_Repeat, PyA_Repeat>(m, "A_Repeat")
+        .def(py::init<>())
+        .def("unlucky_number", &A_Repeat::unlucky_number)
+        .def("say_something", &A_Repeat::say_something)
+        .def("say_everything", &A_Repeat::say_everything);
+    py::class_<B_Repeat, A_Repeat, PyB_Repeat>(m, "B_Repeat")
+        .def(py::init<>())
+        .def("lucky_number", &B_Repeat::lucky_number);
+    py::class_<C_Repeat, B_Repeat, PyC_Repeat>(m, "C_Repeat")
+        .def(py::init<>());
+    py::class_<D_Repeat, C_Repeat, PyD_Repeat>(m, "D_Repeat")
+        .def(py::init<>());
+
+    // test_
+    // Method 2: Templated trampolines
+    py::class_<A_Tpl, PyA_Tpl<>>(m, "A_Tpl")
+        .def(py::init<>())
+        .def("unlucky_number", &A_Tpl::unlucky_number)
+        .def("say_something", &A_Tpl::say_something)
+        .def("say_everything", &A_Tpl::say_everything);
+    py::class_<B_Tpl, A_Tpl, PyB_Tpl<>>(m, "B_Tpl")
+        .def(py::init<>())
+        .def("lucky_number", &B_Tpl::lucky_number);
+    py::class_<C_Tpl, B_Tpl, PyB_Tpl<C_Tpl>>(m, "C_Tpl")
+        .def(py::init<>());
+    py::class_<D_Tpl, C_Tpl, PyB_Tpl<D_Tpl>>(m, "D_Tpl")
+        .def(py::init<>());
+
+
+    // Fix issue #1454 (crash when acquiring/releasing GIL on another thread in Python 2.7)
+    m.def("test_gil", &test_gil);
+    m.def("test_gil_from_thread", &test_gil_from_thread);
+};
diff --git a/3rdparty/pybind11/tests/test_virtual_functions.py b/3rdparty/pybind11/tests/test_virtual_functions.py
new file mode 100644
index 00000000..5ce9abd3
--- /dev/null
+++ b/3rdparty/pybind11/tests/test_virtual_functions.py
@@ -0,0 +1,377 @@
+import pytest
+
+from pybind11_tests import virtual_functions as m
+from pybind11_tests import ConstructorStats
+
+
+def test_override(capture, msg):
+    class ExtendedExampleVirt(m.ExampleVirt):
+        def __init__(self, state):
+            super(ExtendedExampleVirt, self).__init__(state + 1)
+            self.data = "Hello world"
+
+        def run(self, value):
+            print('ExtendedExampleVirt::run(%i), calling parent..' % value)
+            return super(ExtendedExampleVirt, self).run(value + 1)
+
+        def run_bool(self):
+            print('ExtendedExampleVirt::run_bool()')
+            return False
+
+        def get_string1(self):
+            return "override1"
+
+        def pure_virtual(self):
+            print('ExtendedExampleVirt::pure_virtual(): %s' % self.data)
+
+    class ExtendedExampleVirt2(ExtendedExampleVirt):
+        def __init__(self, state):
+            super(ExtendedExampleVirt2, self).__init__(state + 1)
+
+        def get_string2(self):
+            return "override2"
+
+    ex12 = m.ExampleVirt(10)
+    with capture:
+        assert m.runExampleVirt(ex12, 20) == 30
+    assert capture == """
+        Original implementation of ExampleVirt::run(state=10, value=20, str1=default1, str2=default2)
+    """  # noqa: E501 line too long
+
+    with pytest.raises(RuntimeError) as excinfo:
+        m.runExampleVirtVirtual(ex12)
+    assert msg(excinfo.value) == 'Tried to call pure virtual function "ExampleVirt::pure_virtual"'
+
+    ex12p = ExtendedExampleVirt(10)
+    with capture:
+        assert m.runExampleVirt(ex12p, 20) == 32
+    assert capture == """
+        ExtendedExampleVirt::run(20), calling parent..
+        Original implementation of ExampleVirt::run(state=11, value=21, str1=override1, str2=default2)
+    """  # noqa: E501 line too long
+    with capture:
+        assert m.runExampleVirtBool(ex12p) is False
+    assert capture == "ExtendedExampleVirt::run_bool()"
+    with capture:
+        m.runExampleVirtVirtual(ex12p)
+    assert capture == "ExtendedExampleVirt::pure_virtual(): Hello world"
+
+    ex12p2 = ExtendedExampleVirt2(15)
+    with capture:
+        assert m.runExampleVirt(ex12p2, 50) == 68
+    assert capture == """
+        ExtendedExampleVirt::run(50), calling parent..
+        Original implementation of ExampleVirt::run(state=17, value=51, str1=override1, str2=override2)
+    """  # noqa: E501 line too long
+
+    cstats = ConstructorStats.get(m.ExampleVirt)
+    assert cstats.alive() == 3
+    del ex12, ex12p, ex12p2
+    assert cstats.alive() == 0
+    assert cstats.values() == ['10', '11', '17']
+    assert cstats.copy_constructions == 0
+    assert cstats.move_constructions >= 0
+
+
+def test_alias_delay_initialization1(capture):
+    """`A` only initializes its trampoline class when we inherit from it
+
+    If we just create and use an A instance directly, the trampoline initialization is
+    bypassed and we only initialize an A() instead (for performance reasons).
+    """
+    class B(m.A):
+        def __init__(self):
+            super(B, self).__init__()
+
+        def f(self):
+            print("In python f()")
+
+    # C++ version
+    with capture:
+        a = m.A()
+        m.call_f(a)
+        del a
+        pytest.gc_collect()
+    assert capture == "A.f()"
+
+    # Python version
+    with capture:
+        b = B()
+        m.call_f(b)
+        del b
+        pytest.gc_collect()
+    assert capture == """
+        PyA.PyA()
+        PyA.f()
+        In python f()
+        PyA.~PyA()
+    """
+
+
+def test_alias_delay_initialization2(capture):
+    """`A2`, unlike the above, is configured to always initialize the alias
+
+    While the extra initialization and extra class layer has small virtual dispatch
+    performance penalty, it also allows us to do more things with the trampoline
+    class such as defining local variables and performing construction/destruction.
+    """
+    class B2(m.A2):
+        def __init__(self):
+            super(B2, self).__init__()
+
+        def f(self):
+            print("In python B2.f()")
+
+    # No python subclass version
+    with capture:
+        a2 = m.A2()
+        m.call_f(a2)
+        del a2
+        pytest.gc_collect()
+        a3 = m.A2(1)
+        m.call_f(a3)
+        del a3
+        pytest.gc_collect()
+    assert capture == """
+        PyA2.PyA2()
+        PyA2.f()
+        A2.f()
+        PyA2.~PyA2()
+        PyA2.PyA2()
+        PyA2.f()
+        A2.f()
+        PyA2.~PyA2()
+    """
+
+    # Python subclass version
+    with capture:
+        b2 = B2()
+        m.call_f(b2)
+        del b2
+        pytest.gc_collect()
+    assert capture == """
+        PyA2.PyA2()
+        PyA2.f()
+        In python B2.f()
+        PyA2.~PyA2()
+    """
+
+
+# PyPy: Reference count > 1 causes call with noncopyable instance
+# to fail in ncv1.print_nc()
+@pytest.unsupported_on_pypy
+@pytest.mark.skipif(not hasattr(m, "NCVirt"), reason="NCVirt test broken on ICPC")
+def test_move_support():
+    class NCVirtExt(m.NCVirt):
+        def get_noncopyable(self, a, b):
+            # Constructs and returns a new instance:
+            nc = m.NonCopyable(a * a, b * b)
+            return nc
+
+        def get_movable(self, a, b):
+            # Return a referenced copy
+            self.movable = m.Movable(a, b)
+            return self.movable
+
+    class NCVirtExt2(m.NCVirt):
+        def get_noncopyable(self, a, b):
+            # Keep a reference: this is going to throw an exception
+            self.nc = m.NonCopyable(a, b)
+            return self.nc
+
+        def get_movable(self, a, b):
+            # Return a new instance without storing it
+            return m.Movable(a, b)
+
+    ncv1 = NCVirtExt()
+    assert ncv1.print_nc(2, 3) == "36"
+    assert ncv1.print_movable(4, 5) == "9"
+    ncv2 = NCVirtExt2()
+    assert ncv2.print_movable(7, 7) == "14"
+    # Don't check the exception message here because it differs under debug/non-debug mode
+    with pytest.raises(RuntimeError):
+        ncv2.print_nc(9, 9)
+
+    nc_stats = ConstructorStats.get(m.NonCopyable)
+    mv_stats = ConstructorStats.get(m.Movable)
+    assert nc_stats.alive() == 1
+    assert mv_stats.alive() == 1
+    del ncv1, ncv2
+    assert nc_stats.alive() == 0
+    assert mv_stats.alive() == 0
+    assert nc_stats.values() == ['4', '9', '9', '9']
+    assert mv_stats.values() == ['4', '5', '7', '7']
+    assert nc_stats.copy_constructions == 0
+    assert mv_stats.copy_constructions == 1
+    assert nc_stats.move_constructions >= 0
+    assert mv_stats.move_constructions >= 0
+
+
+def test_dispatch_issue(msg):
+    """#159: virtual function dispatch has problems with similar-named functions"""
+    class PyClass1(m.DispatchIssue):
+        def dispatch(self):
+            return "Yay.."
+
+    class PyClass2(m.DispatchIssue):
+        def dispatch(self):
+            with pytest.raises(RuntimeError) as excinfo:
+                super(PyClass2, self).dispatch()
+            assert msg(excinfo.value) == 'Tried to call pure virtual function "Base::dispatch"'
+
+            p = PyClass1()
+            return m.dispatch_issue_go(p)
+
+    b = PyClass2()
+    assert m.dispatch_issue_go(b) == "Yay.."
+
+
+def test_override_ref():
+    """#392/397: overriding reference-returning functions"""
+    o = m.OverrideTest("asdf")
+
+    # Not allowed (see associated .cpp comment)
+    # i = o.str_ref()
+    # assert o.str_ref() == "asdf"
+    assert o.str_value() == "asdf"
+
+    assert o.A_value().value == "hi"
+    a = o.A_ref()
+    assert a.value == "hi"
+    a.value = "bye"
+    assert a.value == "bye"
+
+
+def test_inherited_virtuals():
+    class AR(m.A_Repeat):
+        def unlucky_number(self):
+            return 99
+
+    class AT(m.A_Tpl):
+        def unlucky_number(self):
+            return 999
+
+    obj = AR()
+    assert obj.say_something(3) == "hihihi"
+    assert obj.unlucky_number() == 99
+    assert obj.say_everything() == "hi 99"
+
+    obj = AT()
+    assert obj.say_something(3) == "hihihi"
+    assert obj.unlucky_number() == 999
+    assert obj.say_everything() == "hi 999"
+
+    for obj in [m.B_Repeat(), m.B_Tpl()]:
+        assert obj.say_something(3) == "B says hi 3 times"
+        assert obj.unlucky_number() == 13
+        assert obj.lucky_number() == 7.0
+        assert obj.say_everything() == "B says hi 1 times 13"
+
+    for obj in [m.C_Repeat(), m.C_Tpl()]:
+        assert obj.say_something(3) == "B says hi 3 times"
+        assert obj.unlucky_number() == 4444
+        assert obj.lucky_number() == 888.0
+        assert obj.say_everything() == "B says hi 1 times 4444"
+
+    class CR(m.C_Repeat):
+        def lucky_number(self):
+            return m.C_Repeat.lucky_number(self) + 1.25
+
+    obj = CR()
+    assert obj.say_something(3) == "B says hi 3 times"
+    assert obj.unlucky_number() == 4444
+    assert obj.lucky_number() == 889.25
+    assert obj.say_everything() == "B says hi 1 times 4444"
+
+    class CT(m.C_Tpl):
+        pass
+
+    obj = CT()
+    assert obj.say_something(3) == "B says hi 3 times"
+    assert obj.unlucky_number() == 4444
+    assert obj.lucky_number() == 888.0
+    assert obj.say_everything() == "B says hi 1 times 4444"
+
+    class CCR(CR):
+        def lucky_number(self):
+            return CR.lucky_number(self) * 10
+
+    obj = CCR()
+    assert obj.say_something(3) == "B says hi 3 times"
+    assert obj.unlucky_number() == 4444
+    assert obj.lucky_number() == 8892.5
+    assert obj.say_everything() == "B says hi 1 times 4444"
+
+    class CCT(CT):
+        def lucky_number(self):
+            return CT.lucky_number(self) * 1000
+
+    obj = CCT()
+    assert obj.say_something(3) == "B says hi 3 times"
+    assert obj.unlucky_number() == 4444
+    assert obj.lucky_number() == 888000.0
+    assert obj.say_everything() == "B says hi 1 times 4444"
+
+    class DR(m.D_Repeat):
+        def unlucky_number(self):
+            return 123
+
+        def lucky_number(self):
+            return 42.0
+
+    for obj in [m.D_Repeat(), m.D_Tpl()]:
+        assert obj.say_something(3) == "B says hi 3 times"
+        assert obj.unlucky_number() == 4444
+        assert obj.lucky_number() == 888.0
+        assert obj.say_everything() == "B says hi 1 times 4444"
+
+    obj = DR()
+    assert obj.say_something(3) == "B says hi 3 times"
+    assert obj.unlucky_number() == 123
+    assert obj.lucky_number() == 42.0
+    assert obj.say_everything() == "B says hi 1 times 123"
+
+    class DT(m.D_Tpl):
+        def say_something(self, times):
+            return "DT says:" + (' quack' * times)
+
+        def unlucky_number(self):
+            return 1234
+
+        def lucky_number(self):
+            return -4.25
+
+    obj = DT()
+    assert obj.say_something(3) == "DT says: quack quack quack"
+    assert obj.unlucky_number() == 1234
+    assert obj.lucky_number() == -4.25
+    assert obj.say_everything() == "DT says: quack 1234"
+
+    class DT2(DT):
+        def say_something(self, times):
+            return "DT2: " + ('QUACK' * times)
+
+        def unlucky_number(self):
+            return -3
+
+    class BT(m.B_Tpl):
+        def say_something(self, times):
+            return "BT" * times
+
+        def unlucky_number(self):
+            return -7
+
+        def lucky_number(self):
+            return -1.375
+
+    obj = BT()
+    assert obj.say_something(3) == "BTBTBT"
+    assert obj.unlucky_number() == -7
+    assert obj.lucky_number() == -1.375
+    assert obj.say_everything() == "BT -7"
+
+
+def test_issue_1454():
+    # Fix issue #1454 (crash when acquiring/releasing GIL on another thread in Python 2.7)
+    m.test_gil()
+    m.test_gil_from_thread()
diff --git a/3rdparty/pybind11/tools/FindCatch.cmake b/3rdparty/pybind11/tools/FindCatch.cmake
new file mode 100644
index 00000000..9d490c5a
--- /dev/null
+++ b/3rdparty/pybind11/tools/FindCatch.cmake
@@ -0,0 +1,57 @@
+# - Find the Catch test framework or download it (single header)
+#
+# This is a quick module for internal use. It assumes that Catch is
+# REQUIRED and that a minimum version is provided (not EXACT). If
+# a suitable version isn't found locally, the single header file
+# will be downloaded and placed in the build dir: PROJECT_BINARY_DIR.
+#
+# This code sets the following variables:
+#  CATCH_INCLUDE_DIR      - path to catch.hpp
+#  CATCH_VERSION          - version number
+
+if(NOT Catch_FIND_VERSION)
+  message(FATAL_ERROR "A version number must be specified.")
+elseif(Catch_FIND_REQUIRED)
+  message(FATAL_ERROR "This module assumes Catch is not required.")
+elseif(Catch_FIND_VERSION_EXACT)
+  message(FATAL_ERROR "Exact version numbers are not supported, only minimum.")
+endif()
+
+# Extract the version number from catch.hpp
+function(_get_catch_version)
+  file(STRINGS "${CATCH_INCLUDE_DIR}/catch.hpp" version_line REGEX "Catch v.*" LIMIT_COUNT 1)
+  if(version_line MATCHES "Catch v([0-9]+)\\.([0-9]+)\\.([0-9]+)")
+    set(CATCH_VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}" PARENT_SCOPE)
+  endif()
+endfunction()
+
+# Download the single-header version of Catch
+function(_download_catch version destination_dir)
+  message(STATUS "Downloading catch v${version}...")
+  set(url https://github.com/philsquared/Catch/releases/download/v${version}/catch.hpp)
+  file(DOWNLOAD ${url} "${destination_dir}/catch.hpp" STATUS status)
+  list(GET status 0 error)
+  if(error)
+    message(FATAL_ERROR "Could not download ${url}")
+  endif()
+  set(CATCH_INCLUDE_DIR "${destination_dir}" CACHE INTERNAL "")
+endfunction()
+
+# Look for catch locally
+find_path(CATCH_INCLUDE_DIR NAMES catch.hpp PATH_SUFFIXES catch)
+if(CATCH_INCLUDE_DIR)
+  _get_catch_version()
+endif()
+
+# Download the header if it wasn't found or if it's outdated
+if(NOT CATCH_VERSION OR CATCH_VERSION VERSION_LESS ${Catch_FIND_VERSION})
+  if(DOWNLOAD_CATCH)
+    _download_catch(${Catch_FIND_VERSION} "${PROJECT_BINARY_DIR}/catch/")
+    _get_catch_version()
+  else()
+    set(CATCH_FOUND FALSE)
+    return()
+  endif()
+endif()
+
+set(CATCH_FOUND TRUE)
diff --git a/3rdparty/pybind11/tools/FindEigen3.cmake b/3rdparty/pybind11/tools/FindEigen3.cmake
new file mode 100644
index 00000000..9c546a05
--- /dev/null
+++ b/3rdparty/pybind11/tools/FindEigen3.cmake
@@ -0,0 +1,81 @@
+# - Try to find Eigen3 lib
+#
+# This module supports requiring a minimum version, e.g. you can do
+#   find_package(Eigen3 3.1.2)
+# to require version 3.1.2 or newer of Eigen3.
+#
+# Once done this will define
+#
+#  EIGEN3_FOUND - system has eigen lib with correct version
+#  EIGEN3_INCLUDE_DIR - the eigen include directory
+#  EIGEN3_VERSION - eigen version
+
+# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
+# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
+# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
+
+if(NOT Eigen3_FIND_VERSION)
+  if(NOT Eigen3_FIND_VERSION_MAJOR)
+    set(Eigen3_FIND_VERSION_MAJOR 2)
+  endif(NOT Eigen3_FIND_VERSION_MAJOR)
+  if(NOT Eigen3_FIND_VERSION_MINOR)
+    set(Eigen3_FIND_VERSION_MINOR 91)
+  endif(NOT Eigen3_FIND_VERSION_MINOR)
+  if(NOT Eigen3_FIND_VERSION_PATCH)
+    set(Eigen3_FIND_VERSION_PATCH 0)
+  endif(NOT Eigen3_FIND_VERSION_PATCH)
+
+  set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
+endif(NOT Eigen3_FIND_VERSION)
+
+macro(_eigen3_check_version)
+  file(READ "${EIGEN3_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)
+
+  string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")
+  set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")
+  string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
+  set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")
+  string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
+  set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")
+
+  set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})
+  if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
+    set(EIGEN3_VERSION_OK FALSE)
+  else(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
+    set(EIGEN3_VERSION_OK TRUE)
+  endif(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
+
+  if(NOT EIGEN3_VERSION_OK)
+
+    message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "
+                   "but at least version ${Eigen3_FIND_VERSION} is required")
+  endif(NOT EIGEN3_VERSION_OK)
+endmacro(_eigen3_check_version)
+
+if (EIGEN3_INCLUDE_DIR)
+
+  # in cache already
+  _eigen3_check_version()
+  set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
+
+else (EIGEN3_INCLUDE_DIR)
+
+  find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
+      PATHS
+      ${CMAKE_INSTALL_PREFIX}/include
+      ${KDE4_INCLUDE_DIR}
+      PATH_SUFFIXES eigen3 eigen
+    )
+
+  if(EIGEN3_INCLUDE_DIR)
+    _eigen3_check_version()
+  endif(EIGEN3_INCLUDE_DIR)
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
+
+  mark_as_advanced(EIGEN3_INCLUDE_DIR)
+
+endif(EIGEN3_INCLUDE_DIR)
+
diff --git a/3rdparty/pybind11/tools/FindPythonLibsNew.cmake b/3rdparty/pybind11/tools/FindPythonLibsNew.cmake
new file mode 100644
index 00000000..9ea6036e
--- /dev/null
+++ b/3rdparty/pybind11/tools/FindPythonLibsNew.cmake
@@ -0,0 +1,202 @@
+# - Find python libraries
+# This module finds the libraries corresponding to the Python interpreter
+# FindPythonInterp provides.
+# This code sets the following variables:
+#
+#  PYTHONLIBS_FOUND           - have the Python libs been found
+#  PYTHON_PREFIX              - path to the Python installation
+#  PYTHON_LIBRARIES           - path to the python library
+#  PYTHON_INCLUDE_DIRS        - path to where Python.h is found
+#  PYTHON_MODULE_EXTENSION    - lib extension, e.g. '.so' or '.pyd'
+#  PYTHON_MODULE_PREFIX       - lib name prefix: usually an empty string
+#  PYTHON_SITE_PACKAGES       - path to installation site-packages
+#  PYTHON_IS_DEBUG            - whether the Python interpreter is a debug build
+#
+# Thanks to talljimbo for the patch adding the 'LDVERSION' config
+# variable usage.
+
+#=============================================================================
+# Copyright 2001-2009 Kitware, Inc.
+# Copyright 2012 Continuum Analytics, Inc.
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# * Neither the names of Kitware, Inc., the Insight Software Consortium,
+# nor the names of their contributors may be used to endorse or promote
+# products derived from this software without specific prior written
+# permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#=============================================================================
+
+# Checking for the extension makes sure that `LibsNew` was found and not just `Libs`.
+if(PYTHONLIBS_FOUND AND PYTHON_MODULE_EXTENSION)
+    return()
+endif()
+
+# Use the Python interpreter to find the libs.
+if(PythonLibsNew_FIND_REQUIRED)
+    find_package(PythonInterp ${PythonLibsNew_FIND_VERSION} REQUIRED)
+else()
+    find_package(PythonInterp ${PythonLibsNew_FIND_VERSION})
+endif()
+
+if(NOT PYTHONINTERP_FOUND)
+    set(PYTHONLIBS_FOUND FALSE)
+    set(PythonLibsNew_FOUND FALSE)
+    return()
+endif()
+
+# According to http://stackoverflow.com/questions/646518/python-how-to-detect-debug-interpreter
+# testing whether sys has the gettotalrefcount function is a reliable, cross-platform
+# way to detect a CPython debug interpreter.
+#
+# The library suffix is from the config var LDVERSION sometimes, otherwise
+# VERSION. VERSION will typically be like "2.7" on unix, and "27" on windows.
+execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c"
+    "from distutils import sysconfig as s;import sys;import struct;
+print('.'.join(str(v) for v in sys.version_info));
+print(sys.prefix);
+print(s.get_python_inc(plat_specific=True));
+print(s.get_python_lib(plat_specific=True));
+print(s.get_config_var('SO'));
+print(hasattr(sys, 'gettotalrefcount')+0);
+print(struct.calcsize('@P'));
+print(s.get_config_var('LDVERSION') or s.get_config_var('VERSION'));
+print(s.get_config_var('LIBDIR') or '');
+print(s.get_config_var('MULTIARCH') or '');
+"
+    RESULT_VARIABLE _PYTHON_SUCCESS
+    OUTPUT_VARIABLE _PYTHON_VALUES
+    ERROR_VARIABLE _PYTHON_ERROR_VALUE)
+
+if(NOT _PYTHON_SUCCESS MATCHES 0)
+    if(PythonLibsNew_FIND_REQUIRED)
+        message(FATAL_ERROR
+            "Python config failure:\n${_PYTHON_ERROR_VALUE}")
+    endif()
+    set(PYTHONLIBS_FOUND FALSE)
+    set(PythonLibsNew_FOUND FALSE)
+    return()
+endif()
+
+# Convert the process output into a list
+if(WIN32)
+    string(REGEX REPLACE "\\\\" "/" _PYTHON_VALUES ${_PYTHON_VALUES})
+endif()
+string(REGEX REPLACE ";" "\\\\;" _PYTHON_VALUES ${_PYTHON_VALUES})
+string(REGEX REPLACE "\n" ";" _PYTHON_VALUES ${_PYTHON_VALUES})
+list(GET _PYTHON_VALUES 0 _PYTHON_VERSION_LIST)
+list(GET _PYTHON_VALUES 1 PYTHON_PREFIX)
+list(GET _PYTHON_VALUES 2 PYTHON_INCLUDE_DIR)
+list(GET _PYTHON_VALUES 3 PYTHON_SITE_PACKAGES)
+list(GET _PYTHON_VALUES 4 PYTHON_MODULE_EXTENSION)
+list(GET _PYTHON_VALUES 5 PYTHON_IS_DEBUG)
+list(GET _PYTHON_VALUES 6 PYTHON_SIZEOF_VOID_P)
+list(GET _PYTHON_VALUES 7 PYTHON_LIBRARY_SUFFIX)
+list(GET _PYTHON_VALUES 8 PYTHON_LIBDIR)
+list(GET _PYTHON_VALUES 9 PYTHON_MULTIARCH)
+
+# Make sure the Python has the same pointer-size as the chosen compiler
+# Skip if CMAKE_SIZEOF_VOID_P is not defined
+if(CMAKE_SIZEOF_VOID_P AND (NOT "${PYTHON_SIZEOF_VOID_P}" STREQUAL "${CMAKE_SIZEOF_VOID_P}"))
+    if(PythonLibsNew_FIND_REQUIRED)
+        math(EXPR _PYTHON_BITS "${PYTHON_SIZEOF_VOID_P} * 8")
+        math(EXPR _CMAKE_BITS "${CMAKE_SIZEOF_VOID_P} * 8")
+        message(FATAL_ERROR
+            "Python config failure: Python is ${_PYTHON_BITS}-bit, "
+            "chosen compiler is  ${_CMAKE_BITS}-bit")
+    endif()
+    set(PYTHONLIBS_FOUND FALSE)
+    set(PythonLibsNew_FOUND FALSE)
+    return()
+endif()
+
+# The built-in FindPython didn't always give the version numbers
+string(REGEX REPLACE "\\." ";" _PYTHON_VERSION_LIST ${_PYTHON_VERSION_LIST})
+list(GET _PYTHON_VERSION_LIST 0 PYTHON_VERSION_MAJOR)
+list(GET _PYTHON_VERSION_LIST 1 PYTHON_VERSION_MINOR)
+list(GET _PYTHON_VERSION_LIST 2 PYTHON_VERSION_PATCH)
+
+# Make sure all directory separators are '/'
+string(REGEX REPLACE "\\\\" "/" PYTHON_PREFIX "${PYTHON_PREFIX}")
+string(REGEX REPLACE "\\\\" "/" PYTHON_INCLUDE_DIR "${PYTHON_INCLUDE_DIR}")
+string(REGEX REPLACE "\\\\" "/" PYTHON_SITE_PACKAGES "${PYTHON_SITE_PACKAGES}")
+
+if(CMAKE_HOST_WIN32 AND NOT (MINGW AND DEFINED ENV{MSYSTEM}))
+    set(PYTHON_LIBRARY
+        "${PYTHON_PREFIX}/libs/Python${PYTHON_LIBRARY_SUFFIX}.lib")
+
+    # when run in a venv, PYTHON_PREFIX points to it. But the libraries remain in the
+    # original python installation. They may be found relative to PYTHON_INCLUDE_DIR.
+    if(NOT EXISTS "${PYTHON_LIBRARY}")
+        get_filename_component(_PYTHON_ROOT ${PYTHON_INCLUDE_DIR} DIRECTORY)
+        set(PYTHON_LIBRARY
+            "${_PYTHON_ROOT}/libs/Python${PYTHON_LIBRARY_SUFFIX}.lib")
+    endif()
+
+    # raise an error if the python libs are still not found.
+    if(NOT EXISTS "${PYTHON_LIBRARY}")
+        message(FATAL_ERROR "Python libraries not found")
+    endif()
+
+else()
+    if(PYTHON_MULTIARCH)
+        set(_PYTHON_LIBS_SEARCH "${PYTHON_LIBDIR}/${PYTHON_MULTIARCH}" "${PYTHON_LIBDIR}")
+    else()
+        set(_PYTHON_LIBS_SEARCH "${PYTHON_LIBDIR}")
+    endif()
+    #message(STATUS "Searching for Python libs in ${_PYTHON_LIBS_SEARCH}")
+    # Probably this needs to be more involved. It would be nice if the config
+    # information the python interpreter itself gave us were more complete.
+    find_library(PYTHON_LIBRARY
+        NAMES "python${PYTHON_LIBRARY_SUFFIX}"
+        PATHS ${_PYTHON_LIBS_SEARCH}
+        NO_DEFAULT_PATH)
+
+    # If all else fails, just set the name/version and let the linker figure out the path.
+    if(NOT PYTHON_LIBRARY)
+        set(PYTHON_LIBRARY python${PYTHON_LIBRARY_SUFFIX})
+    endif()
+endif()
+
+MARK_AS_ADVANCED(
+  PYTHON_LIBRARY
+  PYTHON_INCLUDE_DIR
+)
+
+# We use PYTHON_INCLUDE_DIR, PYTHON_LIBRARY and PYTHON_DEBUG_LIBRARY for the
+# cache entries because they are meant to specify the location of a single
+# library. We now set the variables listed by the documentation for this
+# module.
+SET(PYTHON_INCLUDE_DIRS "${PYTHON_INCLUDE_DIR}")
+SET(PYTHON_LIBRARIES "${PYTHON_LIBRARY}")
+SET(PYTHON_DEBUG_LIBRARIES "${PYTHON_DEBUG_LIBRARY}")
+
+find_package_message(PYTHON
+    "Found PythonLibs: ${PYTHON_LIBRARY}"
+    "${PYTHON_EXECUTABLE}${PYTHON_VERSION}")
+
+set(PYTHONLIBS_FOUND TRUE)
+set(PythonLibsNew_FOUND TRUE)
diff --git a/3rdparty/pybind11/tools/check-style.sh b/3rdparty/pybind11/tools/check-style.sh
new file mode 100755
index 00000000..0a9f7d24
--- /dev/null
+++ b/3rdparty/pybind11/tools/check-style.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+#
+# Script to check include/test code for common pybind11 code style errors.
+#
+# This script currently checks for
+#
+# 1. use of tabs instead of spaces
+# 2. MSDOS-style CRLF endings
+# 3. trailing spaces
+# 4. missing space between keyword and parenthesis, e.g.: for(, if(, while(
+# 5. Missing space between right parenthesis and brace, e.g. 'for (...){'
+# 6. opening brace on its own line. It should always be on the same line as the
+#    if/while/for/do statement.
+#
+# Invoke as: tools/check-style.sh
+#
+
+check_style_errors=0
+IFS=$'\n'
+
+found="$( GREP_COLORS='mt=41' GREP_COLOR='41' grep $'\t' include tests/*.{cpp,py,h} docs/*.rst -rn --color=always )"
+if [ -n "$found" ]; then
+    # The mt=41 sets a red background for matched tabs:
+    echo -e '\033[31;01mError: found tab characters in the following files:\033[0m'
+    check_style_errors=1
+    echo "$found" | sed -e 's/^/    /'
+fi
+
+
+found="$( grep -IUlr $'\r' include tests/*.{cpp,py,h} docs/*.rst --color=always )"
+if [ -n "$found" ]; then
+    echo -e '\033[31;01mError: found CRLF characters in the following files:\033[0m'
+    check_style_errors=1
+    echo "$found" | sed -e 's/^/    /'
+fi
+
+found="$(GREP_COLORS='mt=41' GREP_COLOR='41' grep '[[:blank:]]\+$' include tests/*.{cpp,py,h} docs/*.rst -rn --color=always )"
+if [ -n "$found" ]; then
+    # The mt=41 sets a red background for matched trailing spaces
+    echo -e '\033[31;01mError: found trailing spaces in the following files:\033[0m'
+    check_style_errors=1
+    echo "$found" | sed -e 's/^/    /'
+fi
+
+found="$(grep '\<\(if\|for\|while\|catch\)(\|){' include tests/*.{cpp,h} -rn --color=always)"
+if [ -n "$found" ]; then
+    echo -e '\033[31;01mError: found the following coding style problems:\033[0m'
+    check_style_errors=1
+    echo "$found" | sed -e 's/^/    /'
+fi
+
+found="$(awk '
+function prefix(filename, lineno) {
+    return "    \033[35m" filename "\033[36m:\033[32m" lineno "\033[36m:\033[0m"
+}
+function mark(pattern, string) { sub(pattern, "\033[01;31m&\033[0m", string); return string }
+last && /^\s*{/ {
+    print prefix(FILENAME, FNR-1) mark("\\)\\s*$", last)
+    print prefix(FILENAME, FNR)   mark("^\\s*{", $0)
+    last=""
+}
+{ last = /(if|for|while|catch|switch)\s*\(.*\)\s*$/ ? $0 : "" }
+' $(find include -type f) tests/*.{cpp,h} docs/*.rst)"
+if [ -n "$found" ]; then
+    check_style_errors=1
+    echo -e '\033[31;01mError: braces should occur on the same line as the if/while/.. statement. Found issues in the following files:\033[0m'
+    echo "$found"
+fi
+
+exit $check_style_errors
diff --git a/3rdparty/pybind11/tools/libsize.py b/3rdparty/pybind11/tools/libsize.py
new file mode 100644
index 00000000..5dcb8b0d
--- /dev/null
+++ b/3rdparty/pybind11/tools/libsize.py
@@ -0,0 +1,38 @@
+from __future__ import print_function, division
+import os
+import sys
+
+# Internal build script for generating debugging test .so size.
+# Usage:
+#     python libsize.py file.so save.txt -- displays the size of file.so and, if save.txt exists, compares it to the
+#                                           size in it, then overwrites save.txt with the new size for future runs.
+
+if len(sys.argv) != 3:
+    sys.exit("Invalid arguments: usage: python libsize.py file.so save.txt")
+
+lib = sys.argv[1]
+save = sys.argv[2]
+
+if not os.path.exists(lib):
+    sys.exit("Error: requested file ({}) does not exist".format(lib))
+
+libsize = os.path.getsize(lib)
+
+print("------", os.path.basename(lib), "file size:", libsize, end='')
+
+if os.path.exists(save):
+    with open(save) as sf:
+        oldsize = int(sf.readline())
+
+    if oldsize > 0:
+        change = libsize - oldsize
+        if change == 0:
+            print(" (no change)")
+        else:
+            print(" (change of {:+} bytes = {:+.2%})".format(change, change / oldsize))
+else:
+    print()
+
+with open(save, 'w') as sf:
+    sf.write(str(libsize))
+
diff --git a/3rdparty/pybind11/tools/mkdoc.py b/3rdparty/pybind11/tools/mkdoc.py
new file mode 100755
index 00000000..44164af3
--- /dev/null
+++ b/3rdparty/pybind11/tools/mkdoc.py
@@ -0,0 +1,379 @@
+#!/usr/bin/env python3
+#
+#  Syntax: mkdoc.py [-I<path> ..] [.. a list of header files ..]
+#
+#  Extract documentation from C++ header files to use it in Python bindings
+#
+
+import os
+import sys
+import platform
+import re
+import textwrap
+
+from clang import cindex
+from clang.cindex import CursorKind
+from collections import OrderedDict
+from glob import glob
+from threading import Thread, Semaphore
+from multiprocessing import cpu_count
+
+RECURSE_LIST = [
+    CursorKind.TRANSLATION_UNIT,
+    CursorKind.NAMESPACE,
+    CursorKind.CLASS_DECL,
+    CursorKind.STRUCT_DECL,
+    CursorKind.ENUM_DECL,
+    CursorKind.CLASS_TEMPLATE
+]
+
+PRINT_LIST = [
+    CursorKind.CLASS_DECL,
+    CursorKind.STRUCT_DECL,
+    CursorKind.ENUM_DECL,
+    CursorKind.ENUM_CONSTANT_DECL,
+    CursorKind.CLASS_TEMPLATE,
+    CursorKind.FUNCTION_DECL,
+    CursorKind.FUNCTION_TEMPLATE,
+    CursorKind.CONVERSION_FUNCTION,
+    CursorKind.CXX_METHOD,
+    CursorKind.CONSTRUCTOR,
+    CursorKind.FIELD_DECL
+]
+
+PREFIX_BLACKLIST = [
+    CursorKind.TRANSLATION_UNIT
+]
+
+CPP_OPERATORS = {
+    '<=': 'le', '>=': 'ge', '==': 'eq', '!=': 'ne', '[]': 'array',
+    '+=': 'iadd', '-=': 'isub', '*=': 'imul', '/=': 'idiv', '%=':
+    'imod', '&=': 'iand', '|=': 'ior', '^=': 'ixor', '<<=': 'ilshift',
+    '>>=': 'irshift', '++': 'inc', '--': 'dec', '<<': 'lshift', '>>':
+    'rshift', '&&': 'land', '||': 'lor', '!': 'lnot', '~': 'bnot',
+    '&': 'band', '|': 'bor', '+': 'add', '-': 'sub', '*': 'mul', '/':
+    'div', '%': 'mod', '<': 'lt', '>': 'gt', '=': 'assign', '()': 'call'
+}
+
+CPP_OPERATORS = OrderedDict(
+    sorted(CPP_OPERATORS.items(), key=lambda t: -len(t[0])))
+
+job_count = cpu_count()
+job_semaphore = Semaphore(job_count)
+
+
+class NoFilenamesError(ValueError):
+    pass
+
+
+def d(s):
+    return s if isinstance(s, str) else s.decode('utf8')
+
+
+def sanitize_name(name):
+    name = re.sub(r'type-parameter-0-([0-9]+)', r'T\1', name)
+    for k, v in CPP_OPERATORS.items():
+        name = name.replace('operator%s' % k, 'operator_%s' % v)
+    name = re.sub('<.*>', '', name)
+    name = ''.join([ch if ch.isalnum() else '_' for ch in name])
+    name = re.sub('_$', '', re.sub('_+', '_', name))
+    return '__doc_' + name
+
+
+def process_comment(comment):
+    result = ''
+
+    # Remove C++ comment syntax
+    leading_spaces = float('inf')
+    for s in comment.expandtabs(tabsize=4).splitlines():
+        s = s.strip()
+        if s.startswith('/*'):
+            s = s[2:].lstrip('*')
+        elif s.endswith('*/'):
+            s = s[:-2].rstrip('*')
+        elif s.startswith('///'):
+            s = s[3:]
+        if s.startswith('*'):
+            s = s[1:]
+        if len(s) > 0:
+            leading_spaces = min(leading_spaces, len(s) - len(s.lstrip()))
+        result += s + '\n'
+
+    if leading_spaces != float('inf'):
+        result2 = ""
+        for s in result.splitlines():
+            result2 += s[leading_spaces:] + '\n'
+        result = result2
+
+    # Doxygen tags
+    cpp_group = '([\w:]+)'
+    param_group = '([\[\w:\]]+)'
+
+    s = result
+    s = re.sub(r'\\c\s+%s' % cpp_group, r'``\1``', s)
+    s = re.sub(r'\\a\s+%s' % cpp_group, r'*\1*', s)
+    s = re.sub(r'\\e\s+%s' % cpp_group, r'*\1*', s)
+    s = re.sub(r'\\em\s+%s' % cpp_group, r'*\1*', s)
+    s = re.sub(r'\\b\s+%s' % cpp_group, r'**\1**', s)
+    s = re.sub(r'\\ingroup\s+%s' % cpp_group, r'', s)
+    s = re.sub(r'\\param%s?\s+%s' % (param_group, cpp_group),
+               r'\n\n$Parameter ``\2``:\n\n', s)
+    s = re.sub(r'\\tparam%s?\s+%s' % (param_group, cpp_group),
+               r'\n\n$Template parameter ``\2``:\n\n', s)
+
+    for in_, out_ in {
+        'return': 'Returns',
+        'author': 'Author',
+        'authors': 'Authors',
+        'copyright': 'Copyright',
+        'date': 'Date',
+        'remark': 'Remark',
+        'sa': 'See also',
+        'see': 'See also',
+        'extends': 'Extends',
+        'throw': 'Throws',
+        'throws': 'Throws'
+    }.items():
+        s = re.sub(r'\\%s\s*' % in_, r'\n\n$%s:\n\n' % out_, s)
+
+    s = re.sub(r'\\details\s*', r'\n\n', s)
+    s = re.sub(r'\\brief\s*', r'', s)
+    s = re.sub(r'\\short\s*', r'', s)
+    s = re.sub(r'\\ref\s*', r'', s)
+
+    s = re.sub(r'\\code\s?(.*?)\s?\\endcode',
+               r"```\n\1\n```\n", s, flags=re.DOTALL)
+
+    # HTML/TeX tags
+    s = re.sub(r'<tt>(.*?)</tt>', r'``\1``', s, flags=re.DOTALL)
+    s = re.sub(r'<pre>(.*?)</pre>', r"```\n\1\n```\n", s, flags=re.DOTALL)
+    s = re.sub(r'<em>(.*?)</em>', r'*\1*', s, flags=re.DOTALL)
+    s = re.sub(r'<b>(.*?)</b>', r'**\1**', s, flags=re.DOTALL)
+    s = re.sub(r'\\f\$(.*?)\\f\$', r'$\1$', s, flags=re.DOTALL)
+    s = re.sub(r'<li>', r'\n\n* ', s)
+    s = re.sub(r'</?ul>', r'', s)
+    s = re.sub(r'</li>', r'\n\n', s)
+
+    s = s.replace('``true``', '``True``')
+    s = s.replace('``false``', '``False``')
+
+    # Re-flow text
+    wrapper = textwrap.TextWrapper()
+    wrapper.expand_tabs = True
+    wrapper.replace_whitespace = True
+    wrapper.drop_whitespace = True
+    wrapper.width = 70
+    wrapper.initial_indent = wrapper.subsequent_indent = ''
+
+    result = ''
+    in_code_segment = False
+    for x in re.split(r'(```)', s):
+        if x == '```':
+            if not in_code_segment:
+                result += '```\n'
+            else:
+                result += '\n```\n\n'
+            in_code_segment = not in_code_segment
+        elif in_code_segment:
+            result += x.strip()
+        else:
+            for y in re.split(r'(?: *\n *){2,}', x):
+                wrapped = wrapper.fill(re.sub(r'\s+', ' ', y).strip())
+                if len(wrapped) > 0 and wrapped[0] == '$':
+                    result += wrapped[1:] + '\n'
+                    wrapper.initial_indent = \
+                        wrapper.subsequent_indent = ' ' * 4
+                else:
+                    if len(wrapped) > 0:
+                        result += wrapped + '\n\n'
+                    wrapper.initial_indent = wrapper.subsequent_indent = ''
+    return result.rstrip().lstrip('\n')
+
+
+def extract(filename, node, prefix, output):
+    if not (node.location.file is None or
+            os.path.samefile(d(node.location.file.name), filename)):
+        return 0
+    if node.kind in RECURSE_LIST:
+        sub_prefix = prefix
+        if node.kind not in PREFIX_BLACKLIST:
+            if len(sub_prefix) > 0:
+                sub_prefix += '_'
+            sub_prefix += d(node.spelling)
+        for i in node.get_children():
+            extract(filename, i, sub_prefix, output)
+    if node.kind in PRINT_LIST:
+        comment = d(node.raw_comment) if node.raw_comment is not None else ''
+        comment = process_comment(comment)
+        sub_prefix = prefix
+        if len(sub_prefix) > 0:
+            sub_prefix += '_'
+        if len(node.spelling) > 0:
+            name = sanitize_name(sub_prefix + d(node.spelling))
+            output.append((name, filename, comment))
+
+
+class ExtractionThread(Thread):
+    def __init__(self, filename, parameters, output):
+        Thread.__init__(self)
+        self.filename = filename
+        self.parameters = parameters
+        self.output = output
+        job_semaphore.acquire()
+
+    def run(self):
+        print('Processing "%s" ..' % self.filename, file=sys.stderr)
+        try:
+            index = cindex.Index(
+                cindex.conf.lib.clang_createIndex(False, True))
+            tu = index.parse(self.filename, self.parameters)
+            extract(self.filename, tu.cursor, '', self.output)
+        finally:
+            job_semaphore.release()
+
+
+def read_args(args):
+    parameters = []
+    filenames = []
+    if "-x" not in args:
+        parameters.extend(['-x', 'c++'])
+    if not any(it.startswith("-std=") for it in args):
+        parameters.append('-std=c++11')
+
+    if platform.system() == 'Darwin':
+        dev_path = '/Applications/Xcode.app/Contents/Developer/'
+        lib_dir = dev_path + 'Toolchains/XcodeDefault.xctoolchain/usr/lib/'
+        sdk_dir = dev_path + 'Platforms/MacOSX.platform/Developer/SDKs'
+        libclang = lib_dir + 'libclang.dylib'
+
+        if os.path.exists(libclang):
+            cindex.Config.set_library_path(os.path.dirname(libclang))
+
+        if os.path.exists(sdk_dir):
+            sysroot_dir = os.path.join(sdk_dir, next(os.walk(sdk_dir))[1][0])
+            parameters.append('-isysroot')
+            parameters.append(sysroot_dir)
+    elif platform.system() == 'Linux':
+        # clang doesn't find its own base includes by default on Linux,
+        # but different distros install them in different paths.
+        # Try to autodetect, preferring the highest numbered version.
+        def clang_folder_version(d):
+            return [int(ver) for ver in re.findall(r'(?<!lib)(?<!\d)\d+', d)]
+        clang_include_dir = max((
+            path
+            for libdir in ['lib64', 'lib', 'lib32']
+            for path in glob('/usr/%s/clang/*/include' % libdir)
+            if os.path.isdir(path)
+        ), default=None, key=clang_folder_version)
+        if clang_include_dir:
+            parameters.extend(['-isystem', clang_include_dir])
+
+    for item in args:
+        if item.startswith('-'):
+            parameters.append(item)
+        else:
+            filenames.append(item)
+
+    if len(filenames) == 0:
+        raise NoFilenamesError("args parameter did not contain any filenames")
+
+    return parameters, filenames
+
+
+def extract_all(args):
+    parameters, filenames = read_args(args)
+    output = []
+    for filename in filenames:
+        thr = ExtractionThread(filename, parameters, output)
+        thr.start()
+
+    print('Waiting for jobs to finish ..', file=sys.stderr)
+    for i in range(job_count):
+        job_semaphore.acquire()
+
+    return output
+
+
+def write_header(comments, out_file=sys.stdout):
+    print('''/*
+  This file contains docstrings for the Python bindings.
+  Do not edit! These were automatically extracted by mkdoc.py
+ */
+
+#define __EXPAND(x)                                      x
+#define __COUNT(_1, _2, _3, _4, _5, _6, _7, COUNT, ...)  COUNT
+#define __VA_SIZE(...)                                   __EXPAND(__COUNT(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1))
+#define __CAT1(a, b)                                     a ## b
+#define __CAT2(a, b)                                     __CAT1(a, b)
+#define __DOC1(n1)                                       __doc_##n1
+#define __DOC2(n1, n2)                                   __doc_##n1##_##n2
+#define __DOC3(n1, n2, n3)                               __doc_##n1##_##n2##_##n3
+#define __DOC4(n1, n2, n3, n4)                           __doc_##n1##_##n2##_##n3##_##n4
+#define __DOC5(n1, n2, n3, n4, n5)                       __doc_##n1##_##n2##_##n3##_##n4##_##n5
+#define __DOC6(n1, n2, n3, n4, n5, n6)                   __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6
+#define __DOC7(n1, n2, n3, n4, n5, n6, n7)               __doc_##n1##_##n2##_##n3##_##n4##_##n5##_##n6##_##n7
+#define DOC(...)                                         __EXPAND(__EXPAND(__CAT2(__DOC, __VA_SIZE(__VA_ARGS__)))(__VA_ARGS__))
+
+#if defined(__GNUG__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#endif
+''', file=out_file)
+
+
+    name_ctr = 1
+    name_prev = None
+    for name, _, comment in list(sorted(comments, key=lambda x: (x[0], x[1]))):
+        if name == name_prev:
+            name_ctr += 1
+            name = name + "_%i" % name_ctr
+        else:
+            name_prev = name
+            name_ctr = 1
+        print('\nstatic const char *%s =%sR"doc(%s)doc";' %
+              (name, '\n' if '\n' in comment else ' ', comment), file=out_file)
+
+    print('''
+#if defined(__GNUG__)
+#pragma GCC diagnostic pop
+#endif
+''', file=out_file)
+
+
+def mkdoc(args):
+    args = list(args)
+    out_path = None
+    for idx, arg in enumerate(args):
+        if arg.startswith("-o"):
+            args.remove(arg)
+            try:
+                out_path = arg[2:] or args.pop(idx)
+            except IndexError:
+                print("-o flag requires an argument")
+                exit(-1)
+            break
+
+    comments = extract_all(args)
+
+    if out_path:
+        try:
+            with open(out_path, 'w') as out_file:
+                write_header(comments, out_file)
+        except:
+            # In the event of an error, don't leave a partially-written
+            # output file.
+            try:
+                os.unlink(out_path)
+            except:
+                pass
+            raise
+    else:
+        write_header(comments)
+
+
+if __name__ == '__main__':
+    try:
+        mkdoc(sys.argv[1:])
+    except NoFilenamesError:
+        print('Syntax: %s [.. a list of header files ..]' % sys.argv[0])
+        exit(-1)
diff --git a/3rdparty/pybind11/tools/pybind11Config.cmake.in b/3rdparty/pybind11/tools/pybind11Config.cmake.in
new file mode 100644
index 00000000..8a7272ff
--- /dev/null
+++ b/3rdparty/pybind11/tools/pybind11Config.cmake.in
@@ -0,0 +1,104 @@
+# pybind11Config.cmake
+# --------------------
+#
+# PYBIND11 cmake module.
+# This module sets the following variables in your project::
+#
+#   pybind11_FOUND - true if pybind11 and all required components found on the system
+#   pybind11_VERSION - pybind11 version in format Major.Minor.Release
+#   pybind11_INCLUDE_DIRS - Directories where pybind11 and python headers are located.
+#   pybind11_INCLUDE_DIR - Directory where pybind11 headers are located.
+#   pybind11_DEFINITIONS - Definitions necessary to use pybind11, namely USING_pybind11.
+#   pybind11_LIBRARIES - compile flags and python libraries (as needed) to link against.
+#   pybind11_LIBRARY - empty.
+#   CMAKE_MODULE_PATH - appends location of accompanying FindPythonLibsNew.cmake and
+#                       pybind11Tools.cmake modules.
+#
+#
+# Available components: None
+#
+#
+# Exported targets::
+#
+# If pybind11 is found, this module defines the following :prop_tgt:`IMPORTED`
+# interface library targets::
+#
+#   pybind11::module - for extension modules
+#   pybind11::embed - for embedding the Python interpreter
+#
+# Python headers, libraries (as needed by platform), and the C++ standard
+# are attached to the target. Set PythonLibsNew variables to influence
+# python detection and PYBIND11_CPP_STANDARD (-std=c++11 or -std=c++14) to
+# influence standard setting. ::
+#
+#   find_package(pybind11 CONFIG REQUIRED)
+#   message(STATUS "Found pybind11 v${pybind11_VERSION}: ${pybind11_INCLUDE_DIRS}")
+#
+#   # Create an extension module
+#   add_library(mylib MODULE main.cpp)
+#   target_link_libraries(mylib pybind11::module)
+#
+#   # Or embed the Python interpreter into an executable
+#   add_executable(myexe main.cpp)
+#   target_link_libraries(myexe pybind11::embed)
+#
+# Suggested usage::
+#
+# find_package with version info is not recommended except for release versions. ::
+#
+#   find_package(pybind11 CONFIG)
+#   find_package(pybind11 2.0 EXACT CONFIG REQUIRED)
+#
+#
+# The following variables can be set to guide the search for this package::
+#
+#   pybind11_DIR - CMake variable, set to directory containing this Config file
+#   CMAKE_PREFIX_PATH - CMake variable, set to root directory of this package
+#   PATH - environment variable, set to bin directory of this package
+#   CMAKE_DISABLE_FIND_PACKAGE_pybind11 - CMake variable, disables
+#     find_package(pybind11) when not REQUIRED, perhaps to force internal build
+
+@PACKAGE_INIT@
+
+set(PN pybind11)
+
+# location of pybind11/pybind11.h
+set(${PN}_INCLUDE_DIR "${PACKAGE_PREFIX_DIR}/@CMAKE_INSTALL_INCLUDEDIR@")
+
+set(${PN}_LIBRARY "")
+set(${PN}_DEFINITIONS USING_${PN})
+
+check_required_components(${PN})
+
+# make detectable the FindPythonLibsNew.cmake module
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
+
+include(pybind11Tools)
+
+if(NOT (CMAKE_VERSION VERSION_LESS 3.0))
+#-----------------------------------------------------------------------------
+# Don't include targets if this file is being picked up by another
+# project which has already built this as a subproject
+#-----------------------------------------------------------------------------
+if(NOT TARGET ${PN}::pybind11)
+    include("${CMAKE_CURRENT_LIST_DIR}/${PN}Targets.cmake")
+
+    find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} MODULE REQUIRED)
+    set_property(TARGET ${PN}::pybind11 APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${PYTHON_INCLUDE_DIRS})
+    set_property(TARGET ${PN}::embed APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${PYTHON_LIBRARIES})
+    if(WIN32 OR CYGWIN)
+      set_property(TARGET ${PN}::module APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${PYTHON_LIBRARIES})
+    endif()
+
+    if(CMAKE_VERSION VERSION_LESS 3.3)
+      set_property(TARGET ${PN}::pybind11 APPEND PROPERTY INTERFACE_COMPILE_OPTIONS "${PYBIND11_CPP_STANDARD}")
+    else()
+      set_property(TARGET ${PN}::pybind11 APPEND PROPERTY INTERFACE_COMPILE_OPTIONS $<$<COMPILE_LANGUAGE:CXX>:${PYBIND11_CPP_STANDARD}>)
+    endif()
+
+    get_property(_iid TARGET ${PN}::pybind11 PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
+    get_property(_ill TARGET ${PN}::module PROPERTY INTERFACE_LINK_LIBRARIES)
+    set(${PN}_INCLUDE_DIRS ${_iid})
+    set(${PN}_LIBRARIES ${_ico} ${_ill})
+endif()
+endif()
diff --git a/3rdparty/pybind11/tools/pybind11Tools.cmake b/3rdparty/pybind11/tools/pybind11Tools.cmake
new file mode 100644
index 00000000..508e4742
--- /dev/null
+++ b/3rdparty/pybind11/tools/pybind11Tools.cmake
@@ -0,0 +1,227 @@
+# tools/pybind11Tools.cmake -- Build system for the pybind11 modules
+#
+# Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
+#
+# All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+cmake_minimum_required(VERSION 2.8.12)
+
+# Add a CMake parameter for choosing a desired Python version
+if(NOT PYBIND11_PYTHON_VERSION)
+  set(PYBIND11_PYTHON_VERSION "" CACHE STRING "Python version to use for compiling modules")
+endif()
+
+set(Python_ADDITIONAL_VERSIONS 3.9 3.8 3.7 3.6 3.5 3.4)
+find_package(PythonLibsNew ${PYBIND11_PYTHON_VERSION} REQUIRED)
+
+include(CheckCXXCompilerFlag)
+include(CMakeParseArguments)
+
+if(NOT PYBIND11_CPP_STANDARD AND NOT CMAKE_CXX_STANDARD)
+  if(NOT MSVC)
+    check_cxx_compiler_flag("-std=c++14" HAS_CPP14_FLAG)
+
+    if (HAS_CPP14_FLAG)
+      set(PYBIND11_CPP_STANDARD -std=c++14)
+    else()
+      check_cxx_compiler_flag("-std=c++11" HAS_CPP11_FLAG)
+      if (HAS_CPP11_FLAG)
+        set(PYBIND11_CPP_STANDARD -std=c++11)
+      else()
+        message(FATAL_ERROR "Unsupported compiler -- pybind11 requires C++11 support!")
+      endif()
+    endif()
+  elseif(MSVC)
+    set(PYBIND11_CPP_STANDARD /std:c++14)
+  endif()
+
+  set(PYBIND11_CPP_STANDARD ${PYBIND11_CPP_STANDARD} CACHE STRING
+      "C++ standard flag, e.g. -std=c++11, -std=c++14, /std:c++14.  Defaults to C++14 mode." FORCE)
+endif()
+
+# Checks whether the given CXX/linker flags can compile and link a cxx file.  cxxflags and
+# linkerflags are lists of flags to use.  The result variable is a unique variable name for each set
+# of flags: the compilation result will be cached base on the result variable.  If the flags work,
+# sets them in cxxflags_out/linkerflags_out internal cache variables (in addition to ${result}).
+function(_pybind11_return_if_cxx_and_linker_flags_work result cxxflags linkerflags cxxflags_out linkerflags_out)
+  set(CMAKE_REQUIRED_LIBRARIES ${linkerflags})
+  check_cxx_compiler_flag("${cxxflags}" ${result})
+  if (${result})
+    set(${cxxflags_out} "${cxxflags}" CACHE INTERNAL "" FORCE)
+    set(${linkerflags_out} "${linkerflags}" CACHE INTERNAL "" FORCE)
+  endif()
+endfunction()
+
+# Internal: find the appropriate link time optimization flags for this compiler
+function(_pybind11_add_lto_flags target_name prefer_thin_lto)
+  if (NOT DEFINED PYBIND11_LTO_CXX_FLAGS)
+    set(PYBIND11_LTO_CXX_FLAGS "" CACHE INTERNAL "")
+    set(PYBIND11_LTO_LINKER_FLAGS "" CACHE INTERNAL "")
+
+    if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+      set(cxx_append "")
+      set(linker_append "")
+      if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT APPLE)
+        # Clang Gold plugin does not support -Os; append -O3 to MinSizeRel builds to override it
+        set(linker_append ";$<$<CONFIG:MinSizeRel>:-O3>")
+      elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+        set(cxx_append ";-fno-fat-lto-objects")
+      endif()
+
+      if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND prefer_thin_lto)
+        _pybind11_return_if_cxx_and_linker_flags_work(HAS_FLTO_THIN
+          "-flto=thin${cxx_append}" "-flto=thin${linker_append}"
+          PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+      endif()
+
+      if (NOT HAS_FLTO_THIN)
+        _pybind11_return_if_cxx_and_linker_flags_work(HAS_FLTO
+          "-flto${cxx_append}" "-flto${linker_append}"
+          PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+      endif()
+    elseif (CMAKE_CXX_COMPILER_ID MATCHES "Intel")
+      # Intel equivalent to LTO is called IPO
+      _pybind11_return_if_cxx_and_linker_flags_work(HAS_INTEL_IPO
+      "-ipo" "-ipo" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+    elseif(MSVC)
+      # cmake only interprets libraries as linker flags when they start with a - (otherwise it
+      # converts /LTCG to \LTCG as if it was a Windows path).  Luckily MSVC supports passing flags
+      # with - instead of /, even if it is a bit non-standard:
+      _pybind11_return_if_cxx_and_linker_flags_work(HAS_MSVC_GL_LTCG
+        "/GL" "-LTCG" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
+    endif()
+
+    if (PYBIND11_LTO_CXX_FLAGS)
+      message(STATUS "LTO enabled")
+    else()
+      message(STATUS "LTO disabled (not supported by the compiler and/or linker)")
+    endif()
+  endif()
+
+  # Enable LTO flags if found, except for Debug builds
+  if (PYBIND11_LTO_CXX_FLAGS)
+    target_compile_options(${target_name} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:${PYBIND11_LTO_CXX_FLAGS}>")
+  endif()
+  if (PYBIND11_LTO_LINKER_FLAGS)
+    target_link_libraries(${target_name} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:${PYBIND11_LTO_LINKER_FLAGS}>")
+  endif()
+endfunction()
+
+# Build a Python extension module:
+# pybind11_add_module(<name> [MODULE | SHARED] [EXCLUDE_FROM_ALL]
+#                     [NO_EXTRAS] [SYSTEM] [THIN_LTO] source1 [source2 ...])
+#
+function(pybind11_add_module target_name)
+  set(options MODULE SHARED EXCLUDE_FROM_ALL NO_EXTRAS SYSTEM THIN_LTO)
+  cmake_parse_arguments(ARG "${options}" "" "" ${ARGN})
+
+  if(ARG_MODULE AND ARG_SHARED)
+    message(FATAL_ERROR "Can't be both MODULE and SHARED")
+  elseif(ARG_SHARED)
+    set(lib_type SHARED)
+  else()
+    set(lib_type MODULE)
+  endif()
+
+  if(ARG_EXCLUDE_FROM_ALL)
+    set(exclude_from_all EXCLUDE_FROM_ALL)
+  endif()
+
+  add_library(${target_name} ${lib_type} ${exclude_from_all} ${ARG_UNPARSED_ARGUMENTS})
+
+  if(ARG_SYSTEM)
+    set(inc_isystem SYSTEM)
+  endif()
+
+  target_include_directories(${target_name} ${inc_isystem}
+    PRIVATE ${PYBIND11_INCLUDE_DIR}  # from project CMakeLists.txt
+    PRIVATE ${pybind11_INCLUDE_DIR}  # from pybind11Config
+    PRIVATE ${PYTHON_INCLUDE_DIRS})
+
+  # Python debug libraries expose slightly different objects
+  # https://docs.python.org/3.6/c-api/intro.html#debugging-builds
+  # https://stackoverflow.com/questions/39161202/how-to-work-around-missing-pymodule-create2-in-amd64-win-python35-d-lib
+  if(PYTHON_IS_DEBUG)
+    target_compile_definitions(${target_name} PRIVATE Py_DEBUG)
+  endif()
+
+  # The prefix and extension are provided by FindPythonLibsNew.cmake
+  set_target_properties(${target_name} PROPERTIES PREFIX "${PYTHON_MODULE_PREFIX}")
+  set_target_properties(${target_name} PROPERTIES SUFFIX "${PYTHON_MODULE_EXTENSION}")
+
+  # -fvisibility=hidden is required to allow multiple modules compiled against
+  # different pybind versions to work properly, and for some features (e.g.
+  # py::module_local).  We force it on everything inside the `pybind11`
+  # namespace; also turning it on for a pybind module compilation here avoids
+  # potential warnings or issues from having mixed hidden/non-hidden types.
+  set_target_properties(${target_name} PROPERTIES CXX_VISIBILITY_PRESET "hidden")
+  set_target_properties(${target_name} PROPERTIES CUDA_VISIBILITY_PRESET "hidden")
+
+  if(WIN32 OR CYGWIN)
+    # Link against the Python shared library on Windows
+    target_link_libraries(${target_name} PRIVATE ${PYTHON_LIBRARIES})
+  elseif(APPLE)
+    # It's quite common to have multiple copies of the same Python version
+    # installed on one's system. E.g.: one copy from the OS and another copy
+    # that's statically linked into an application like Blender or Maya.
+    # If we link our plugin library against the OS Python here and import it
+    # into Blender or Maya later on, this will cause segfaults when multiple
+    # conflicting Python instances are active at the same time (even when they
+    # are of the same version).
+
+    # Windows is not affected by this issue since it handles DLL imports
+    # differently. The solution for Linux and Mac OS is simple: we just don't
+    # link against the Python library. The resulting shared library will have
+    # missing symbols, but that's perfectly fine -- they will be resolved at
+    # import time.
+
+    target_link_libraries(${target_name} PRIVATE "-undefined dynamic_lookup")
+
+    if(ARG_SHARED)
+      # Suppress CMake >= 3.0 warning for shared libraries
+      set_target_properties(${target_name} PROPERTIES MACOSX_RPATH ON)
+    endif()
+  endif()
+
+  # Make sure C++11/14 are enabled
+  if(CMAKE_VERSION VERSION_LESS 3.3)
+    target_compile_options(${target_name} PUBLIC ${PYBIND11_CPP_STANDARD})
+  else()
+    target_compile_options(${target_name} PUBLIC $<$<COMPILE_LANGUAGE:CXX>:${PYBIND11_CPP_STANDARD}>)
+  endif()
+
+  if(ARG_NO_EXTRAS)
+    return()
+  endif()
+
+  _pybind11_add_lto_flags(${target_name} ${ARG_THIN_LTO})
+
+  if (NOT MSVC AND NOT ${CMAKE_BUILD_TYPE} MATCHES Debug|RelWithDebInfo)
+    # Strip unnecessary sections of the binary on Linux/Mac OS
+    if(CMAKE_STRIP)
+      if(APPLE)
+        add_custom_command(TARGET ${target_name} POST_BUILD
+                           COMMAND ${CMAKE_STRIP} -x $<TARGET_FILE:${target_name}>)
+      else()
+        add_custom_command(TARGET ${target_name} POST_BUILD
+                           COMMAND ${CMAKE_STRIP} $<TARGET_FILE:${target_name}>)
+      endif()
+    endif()
+  endif()
+
+  if(MSVC)
+    # /MP enables multithreaded builds (relevant when there are many files), /bigobj is
+    # needed for bigger binding projects due to the limit to 64k addressable sections
+    target_compile_options(${target_name} PRIVATE /bigobj)
+    if(CMAKE_VERSION VERSION_LESS 3.11)
+      target_compile_options(${target_name} PRIVATE $<$<NOT:$<CONFIG:Debug>>:/MP>)
+    else()
+      # Only set these options for C++ files.  This is important so that, for
+      # instance, projects that include other types of source files like CUDA
+      # .cu files don't get these options propagated to nvcc since that would
+      # cause the build to fail.
+      target_compile_options(${target_name} PRIVATE $<$<NOT:$<CONFIG:Debug>>:$<$<COMPILE_LANGUAGE:CXX>:/MP>>)
+    endif()
+  endif()
+endfunction()