pybind11/tests/test_buffers.py

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import struct
import pytest
from pybind11_tests import Matrix, ConstructorStats, PTMFBuffer, ConstPTMFBuffer, DerivedPTMFBuffer
pytestmark = pytest.requires_numpy
with pytest.suppress(ImportError):
import numpy as np
def test_from_python():
with pytest.raises(RuntimeError) as excinfo:
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 = Matrix(m3)
for i in range(m4.rows()):
for j in range(m4.cols()):
assert m3[i, j] == m4[i, j]
cstats = ConstructorStats.get(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():
m = Matrix(5, 5)
assert memoryview(m).shape == (5, 5)
assert m[2, 3] == 0
m[2, 3] = 4
assert m[2, 3] == 4
m2 = np.array(m, copy=False)
assert m2.shape == (5, 5)
assert abs(m2).sum() == 4
assert m2[2, 3] == 4
m2[2, 3] = 5
assert m2[2, 3] == 5
cstats = ConstructorStats.get(Matrix)
assert cstats.alive() == 1
del m
pytest.gc_collect()
assert cstats.alive() == 1
del m2 # holds an m reference
pytest.gc_collect()
assert cstats.alive() == 0
assert cstats.values() == ["5x5 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"""
from pybind11_tests import SquareMatrix
matrix = SquareMatrix(5)
assert memoryview(matrix).shape == (5, 5)
assert np.asarray(matrix).shape == (5, 5)
@pytest.unsupported_on_pypy
def test_ptmf():
for cls in [PTMFBuffer, ConstPTMFBuffer, DerivedPTMFBuffer]:
buf = cls()
buf.value = 0x12345678
value = struct.unpack('i', bytearray(buf))[0]
assert value == 0x12345678