1 files changed, 377 insertions, 0 deletions
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()