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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)
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