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Merge pull request #379 from nevion/buffer_info

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Buffer info improvements
This commit is contained in:
Wenzel Jakob 2016-09-04 23:02:20 +09:00 committed by GitHub
commit 987be18fee
1 changed files with 29 additions and 8 deletions
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37
include/pybind11/common.h
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@ -203,15 +203,15 @@ enum class return_value_policy : uint8_t {
/// Information record describing a Python buffer object
struct buffer_info {
void *ptr; // Pointer to the underlying storage
size_t itemsize; // Size of individual items in bytes
size_t size; // Total number of entries
void *ptr = nullptr; // Pointer to the underlying storage
size_t itemsize = 0; // Size of individual items in bytes
size_t size = 0; // Total number of entries
std::string format; // For homogeneous buffers, this should be set to format_descriptor<T>::format()
size_t ndim; // Number of dimensions
size_t ndim = 0; // Number of dimensions
std::vector<size_t> shape; // Shape of the tensor (1 entry per dimension)
std::vector<size_t> strides; // Number of entries between adjacent entries (for each per dimension)
buffer_info() : ptr(nullptr), view(nullptr) {}
buffer_info(){}
buffer_info(void *ptr, size_t itemsize, const std::string &format, size_t ndim,
const std::vector<size_t> &shape, const std::vector<size_t> &strides)
@ -225,9 +225,9 @@ struct buffer_info {
: buffer_info(ptr, itemsize, format, 1, std::vector<size_t> { size },
std::vector<size_t> { itemsize }) { }
buffer_info(Py_buffer *view)
buffer_info(Py_buffer *view, bool ownview = true)
: ptr(view->buf), itemsize((size_t) view->itemsize), size(1), format(view->format),
ndim((size_t) view->ndim), shape((size_t) view->ndim), strides((size_t) view->ndim), view(view) {
ndim((size_t) view->ndim), shape((size_t) view->ndim), strides((size_t) view->ndim), view(view), ownview(ownview) {
for (size_t i = 0; i < (size_t) view->ndim; ++i) {
shape[i] = (size_t) view->shape[i];
strides[i] = (size_t) view->strides[i];
@ -235,12 +235,33 @@ struct buffer_info {
}
}
buffer_info(const buffer_info &) = delete;
buffer_info& operator=(const buffer_info &) = delete;
buffer_info(buffer_info &&other){
(*this) = std::move(other);
}
buffer_info& operator=(buffer_info &&rhs){
ptr = rhs.ptr;
itemsize = rhs.itemsize;
size = rhs.size;
format = std::move(rhs.format);
ndim = rhs.ndim;
shape = std::move(rhs.shape);
strides = std::move(rhs.strides);
std::swap(view, rhs.view);
std::swap(ownview, rhs.ownview);
return *this;
}
~buffer_info() {
if (view) { PyBuffer_Release(view); delete view; }
if (view && ownview) { PyBuffer_Release(view); delete view; }
}
private:
Py_buffer *view = nullptr;
bool ownview = false;
};
NAMESPACE_BEGIN(detail)