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