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a22dd2d1df
This also matches the Eigen example for the row-major case. This also enhances one of the tests to trigger a failure (and fixes it in the PR). (This isn't really a flaw in pybind itself, but rather fixes wrong code in the test code and docs).
88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
import struct
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import pytest
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from pybind11_tests import buffers as m
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from pybind11_tests import ConstructorStats
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pytestmark = pytest.requires_numpy
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with pytest.suppress(ImportError):
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import numpy as np
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def test_from_python():
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with pytest.raises(RuntimeError) as excinfo:
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m.Matrix(np.array([1, 2, 3])) # trying to assign a 1D array
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assert str(excinfo.value) == "Incompatible buffer format!"
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m3 = np.array([[1, 2, 3], [4, 5, 6]]).astype(np.float32)
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m4 = m.Matrix(m3)
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for i in range(m4.rows()):
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for j in range(m4.cols()):
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assert m3[i, j] == m4[i, j]
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cstats = ConstructorStats.get(m.Matrix)
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assert cstats.alive() == 1
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del m3, m4
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assert cstats.alive() == 0
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assert cstats.values() == ["2x3 matrix"]
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assert cstats.copy_constructions == 0
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# assert cstats.move_constructions >= 0 # Don't invoke any
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assert cstats.copy_assignments == 0
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assert cstats.move_assignments == 0
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# PyPy: Memory leak in the "np.array(m, copy=False)" call
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# https://bitbucket.org/pypy/pypy/issues/2444
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@pytest.unsupported_on_pypy
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def test_to_python():
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mat = m.Matrix(5, 4)
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assert memoryview(mat).shape == (5, 4)
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assert mat[2, 3] == 0
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mat[2, 3] = 4.0
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mat[3, 2] = 7.0
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assert mat[2, 3] == 4
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assert mat[3, 2] == 7
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assert struct.unpack_from('f', mat, (3 * 4 + 2) * 4) == (7, )
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assert struct.unpack_from('f', mat, (2 * 4 + 3) * 4) == (4, )
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mat2 = np.array(mat, copy=False)
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assert mat2.shape == (5, 4)
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assert abs(mat2).sum() == 11
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assert mat2[2, 3] == 4 and mat2[3, 2] == 7
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mat2[2, 3] = 5
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assert mat2[2, 3] == 5
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cstats = ConstructorStats.get(m.Matrix)
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assert cstats.alive() == 1
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del mat
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pytest.gc_collect()
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assert cstats.alive() == 1
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del mat2 # holds a mat reference
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pytest.gc_collect()
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assert cstats.alive() == 0
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assert cstats.values() == ["5x4 matrix"]
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assert cstats.copy_constructions == 0
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# assert cstats.move_constructions >= 0 # Don't invoke any
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assert cstats.copy_assignments == 0
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assert cstats.move_assignments == 0
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@pytest.unsupported_on_pypy
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def test_inherited_protocol():
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"""SquareMatrix is derived from Matrix and inherits the buffer protocol"""
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matrix = m.SquareMatrix(5)
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assert memoryview(matrix).shape == (5, 5)
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assert np.asarray(matrix).shape == (5, 5)
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@pytest.unsupported_on_pypy
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def test_pointer_to_member_fn():
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for cls in [m.Buffer, m.ConstBuffer, m.DerivedBuffer]:
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buf = cls()
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buf.value = 0x12345678
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value = struct.unpack('i', bytearray(buf))[0]
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assert value == 0x12345678
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