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https://github.com/python/cpython
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315fc52db1
I think that none of these API calls can fail, but only few of them are documented as such. Add the sentence "This function always succeeds" (which is the same already used e.g. by PyNumber_Check) to all of them.
65 lines
2.3 KiB
ReStructuredText
65 lines
2.3 KiB
ReStructuredText
.. highlight:: c
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.. _memoryview-objects:
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.. index::
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object: memoryview
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MemoryView objects
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------------------
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A :class:`memoryview` object exposes the C level :ref:`buffer interface
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<bufferobjects>` as a Python object which can then be passed around like
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any other object.
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.. c:function:: PyObject *PyMemoryView_FromObject(PyObject *obj)
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Create a memoryview object from an object that provides the buffer interface.
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If *obj* supports writable buffer exports, the memoryview object will be
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read/write, otherwise it may be either read-only or read/write at the
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discretion of the exporter.
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.. c:function:: PyObject *PyMemoryView_FromMemory(char *mem, Py_ssize_t size, int flags)
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Create a memoryview object using *mem* as the underlying buffer.
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*flags* can be one of :c:macro:`PyBUF_READ` or :c:macro:`PyBUF_WRITE`.
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.. versionadded:: 3.3
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.. c:function:: PyObject *PyMemoryView_FromBuffer(Py_buffer *view)
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Create a memoryview object wrapping the given buffer structure *view*.
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For simple byte buffers, :c:func:`PyMemoryView_FromMemory` is the preferred
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function.
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.. c:function:: PyObject *PyMemoryView_GetContiguous(PyObject *obj, int buffertype, char order)
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Create a memoryview object to a :term:`contiguous` chunk of memory (in either
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'C' or 'F'ortran *order*) from an object that defines the buffer
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interface. If memory is contiguous, the memoryview object points to the
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original memory. Otherwise, a copy is made and the memoryview points to a
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new bytes object.
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.. c:function:: int PyMemoryView_Check(PyObject *obj)
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Return true if the object *obj* is a memoryview object. It is not
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currently allowed to create subclasses of :class:`memoryview`. This
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function always succeeds.
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.. c:function:: Py_buffer *PyMemoryView_GET_BUFFER(PyObject *mview)
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Return a pointer to the memoryview's private copy of the exporter's buffer.
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*mview* **must** be a memoryview instance; this macro doesn't check its type,
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you must do it yourself or you will risk crashes.
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.. c:function:: Py_buffer *PyMemoryView_GET_BASE(PyObject *mview)
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Return either a pointer to the exporting object that the memoryview is based
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on or ``NULL`` if the memoryview has been created by one of the functions
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:c:func:`PyMemoryView_FromMemory` or :c:func:`PyMemoryView_FromBuffer`.
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*mview* **must** be a memoryview instance.
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