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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Please add `getbufferproc` and `releasebufferproc` to the limited API headers","articleBody":"# Feature or enhancement\r\n\r\nStarting with Python 3.11 the Py_Buffer API has [been made available in the limited API](https://github.com/python/cpython/issues/89622), including the `bf_getbuffer` and `bf_releasebuffer` type slots.\r\n\r\nHowever the definitions for the function pointer types stored in those slots, `getbufferproc` and `releasebufferproc` are still [only defined when including \"cpython\" headers](https://github.com/python/cpython/blob/c051d55ddb29c4ff7b1fcc65971535f78369ffc0/Include/cpython/object.h#L54-L55).\r\n\r\nThis means on the limited API starting with Python 3.11 it is now possible to do `PyType_GetSlot(Py_TYPE(obj), Py_bf_getbuffer)`, however the `void *` returned does not have a function pointer type available which it can be cast to (unless the user adds this typedef themselves in their own code).\r\n\r\n# Pitch\r\n\r\nThis is a relatively straightforward change to make use of these type slots more convenient on the limited API.\r\n\r\nI wrote an initial implementation at https://github.com/python/cpython/pull/31158. A couple of tiny tweaks beyond moving the typedefs was necessary so that forward definitions continued to function. Please see that PR for the detail.\r\n","author":{"url":"https://github.com/davidhewitt","@type":"Person","name":"davidhewitt"},"datePublished":"2022-10-18T18:54:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/98410/cpython/issues/98410"}