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Add buffer_info::as_pybuffer() method

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Ivan Smirnov 2016-06-19 14:37:55 +01:00
parent 3dd325b772
commit a7e62e1ca6
1 changed files with 25 additions and 0 deletions
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25
include/pybind11/common.h
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@ -231,6 +231,31 @@ struct buffer_info {
~buffer_info() {
if (view) { PyBuffer_Release(view); delete view; }
}
Py_buffer& as_pybuffer() const {
static Py_buffer buf { };
// Py_buffer uses signed sizes, strides and shape!..
static std::vector<Py_ssize_t> py_strides { };
static std::vector<Py_ssize_t> py_shape { };
buf.buf = ptr;
buf.itemsize = (Py_ssize_t) itemsize;
buf.format = const_cast<char *>(format.c_str());
buf.ndim = (int) ndim;
buf.len = (Py_ssize_t) size;
py_strides.clear();
py_shape.clear();
for (size_t i = 0; i < ndim; ++i) {
py_strides.push_back((Py_ssize_t) strides[i]);
py_shape.push_back((Py_ssize_t) shape[i]);
}
buf.strides = py_strides.data();
buf.shape = py_shape.data();
buf.suboffsets = nullptr;
buf.readonly = false;
buf.internal = nullptr;
return buf;
}
private:
Py_buffer *view = nullptr;
};