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Python buffer objects can have negative strides.

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This commit is contained in:
Cris Luengo
2017-04-05 16:13:04 -06:00
committed by Dean Moldovan
parent 2b941b38b4
commit d400f60c96
6 changed files with 40 additions and 33 deletions
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10
docs/advanced/pycpp/numpy.rst
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@@ -41,8 +41,8 @@ completely avoid copy operations with Python expressions like
py::format_descriptor<float>::format(), /* Python struct-style format descriptor */
2, /* Number of dimensions */
{ m.rows(), m.cols() }, /* Buffer dimensions */
{ sizeof(float) * m.rows(), /* Strides (in bytes) for each index */
sizeof(float) }
{ (ssize_t)( sizeof(float) * m.rows() ),/* Strides (in bytes) for each index */
(ssize_t)( sizeof(float) ) }
);
});
@@ -61,7 +61,7 @@ specification.
std::string format;
int ndim;
std::vector<size_t> shape;
std::vector<size_t> strides;
std::vector<ssize_t> strides;
};
To create a C++ function that can take a Python buffer object as an argument,
@@ -121,8 +121,8 @@ as follows:
{ (size_t) m.rows(),
(size_t) m.cols() },
/* Strides (in bytes) for each index */
{ sizeof(Scalar) * (rowMajor ? m.cols() : 1),
sizeof(Scalar) * (rowMajor ? 1 : m.rows()) }
{ (ssize_t)( sizeof(Scalar) * (rowMajor ? m.cols() : 1) ),
(ssize_t)( sizeof(Scalar) * (rowMajor ? 1 : m.rows()) ) }
);
})