mirror of
https://github.com/pybind/pybind11.git
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221 lines
6.8 KiB
Python
221 lines
6.8 KiB
Python
import ctypes
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import io
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import struct
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import pytest
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import env
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from pybind11_tests import ConstructorStats
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from pybind11_tests import buffers as m
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np = pytest.importorskip("numpy")
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if env.WIN:
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# Windows does not have these (see e.g. #1908). But who knows, maybe later?
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np_float128_or_none = getattr(np, "float128", None)
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np_complex256_or_none = getattr(np, "complex256", None)
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else:
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np_float128_or_none = np.float128
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np_complex256_or_none = np.complex256
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@pytest.mark.parametrize(
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("cpp_name", "expected_fmts", "np_array_dtype"),
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[
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("PyObject *", ["O"], object),
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("bool", ["?"], np.bool_),
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("std::int8_t", ["b"], np.int8),
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("std::uint8_t", ["B"], np.uint8),
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("std::int16_t", ["h"], np.int16),
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("std::uint16_t", ["H"], np.uint16),
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("std::int32_t", ["i"], np.int32),
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("std::uint32_t", ["I"], np.uint32),
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("std::int64_t", ["q"], np.int64),
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("std::uint64_t", ["Q"], np.uint64),
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("float", ["f"], np.float32),
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("double", ["d"], np.float64),
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("long double", ["g", "d"], np_float128_or_none),
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("std::complex<float>", ["Zf"], np.complex64),
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("std::complex<double>", ["Zd"], np.complex128),
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("std::complex<long double>", ["Zg", "Zd"], np_complex256_or_none),
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],
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)
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def test_format_descriptor_format(cpp_name, expected_fmts, np_array_dtype):
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fmt = m.format_descriptor_format(cpp_name)
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assert fmt in expected_fmts
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# Everything below just documents long-standing inconsistencies.
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# See also: https://github.com/pybind/pybind11/issues/1908
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if np_array_dtype is not None:
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# py::format_descriptor<> vs np.array:
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na = np.array([], dtype=np_array_dtype)
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bi = m.get_buffer_info(na)
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if fmt in ("i", "q"):
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assert bi.format in [fmt, "l"]
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elif fmt in ("I", "Q"):
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assert bi.format in [fmt, "L"]
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else:
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assert bi.format == fmt
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# py::format_descriptor<> vs np.format_parser():
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fmtp = fmt[1:] if fmt.startswith("Z") else fmt
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fp = np.format_parser(fmtp, [], [])
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assert fp.dtype is not None
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# DO NOT try to compare fp.dtype and na.dtype, unless you have a lot of
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# spare time to make sense of it and possibly chime in under #1908.
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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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# https://foss.heptapod.net/pypy/pypy/-/issues/2444
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# TODO: fix on recent PyPy
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@pytest.mark.xfail(
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env.PYPY, reason="PyPy 7.3.7 doesn't clear this anymore", strict=False
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)
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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
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assert 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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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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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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def test_readonly_buffer():
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buf = m.BufferReadOnly(0x64)
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view = memoryview(buf)
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assert view[0] == 0x64
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assert view.readonly
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with pytest.raises(TypeError):
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view[0] = 0
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def test_selective_readonly_buffer():
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buf = m.BufferReadOnlySelect()
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memoryview(buf)[0] = 0x64
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assert buf.value == 0x64
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io.BytesIO(b"A").readinto(buf)
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assert buf.value == ord(b"A")
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buf.readonly = True
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with pytest.raises(TypeError):
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memoryview(buf)[0] = 0
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with pytest.raises(TypeError):
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io.BytesIO(b"1").readinto(buf)
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def test_ctypes_array_1d():
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char1d = (ctypes.c_char * 10)()
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int1d = (ctypes.c_int * 15)()
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long1d = (ctypes.c_long * 7)()
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for carray in (char1d, int1d, long1d):
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info = m.get_buffer_info(carray)
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assert info.itemsize == ctypes.sizeof(carray._type_)
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assert info.size == len(carray)
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assert info.ndim == 1
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assert info.shape == [info.size]
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assert info.strides == [info.itemsize]
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assert not info.readonly
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def test_ctypes_array_2d():
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char2d = ((ctypes.c_char * 10) * 4)()
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int2d = ((ctypes.c_int * 15) * 3)()
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long2d = ((ctypes.c_long * 7) * 2)()
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for carray in (char2d, int2d, long2d):
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info = m.get_buffer_info(carray)
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assert info.itemsize == ctypes.sizeof(carray[0]._type_)
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assert info.size == len(carray) * len(carray[0])
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assert info.ndim == 2
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assert info.shape == [len(carray), len(carray[0])]
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assert info.strides == [info.itemsize * len(carray[0]), info.itemsize]
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assert not info.readonly
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def test_ctypes_from_buffer():
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test_pystr = b"0123456789"
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for pyarray in (test_pystr, bytearray(test_pystr)):
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pyinfo = m.get_buffer_info(pyarray)
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if pyinfo.readonly:
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cbytes = (ctypes.c_char * len(pyarray)).from_buffer_copy(pyarray)
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cinfo = m.get_buffer_info(cbytes)
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else:
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cbytes = (ctypes.c_char * len(pyarray)).from_buffer(pyarray)
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cinfo = m.get_buffer_info(cbytes)
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assert cinfo.size == pyinfo.size
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assert cinfo.ndim == pyinfo.ndim
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assert cinfo.shape == pyinfo.shape
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assert cinfo.strides == pyinfo.strides
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assert not cinfo.readonly
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