8000 [3.13] gh-123609: Clarify usage of standalone `PyBUF_FORMAT` (GH-123778) by miss-islington · Pull Request #123903 · python/cpython · GitHub
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[3.13] gh-123609: Clarify usag 8000 e of standalone PyBUF_FORMAT (GH-123778) #123903

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Sep 24, 2024
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[3.13] gh-123609: Clarify usage of standalone PyBUF_FORMAT (GH-123778) #123903

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gh-123609: Clarify usage of standalone PyBUF_FORMAT (GH-123778) 
(cherry picked from commit 962304a)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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@ZeroIntensity @miss-islington
ZeroIntensity authored and miss-islington committed Sep 10, 2024
commit 2a571da64a543c1f618bf7c19a9d82f55fe1aaba
9 changes: 5 additions & 4 deletions Doc/c-api/buffer.rst
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Expand Up @@ -244,7 +244,6 @@ The following fields are not influenced by *flags* and must always be filled in
with the correct values: :c:member:`~Py_buffer.obj`, :c:member:`~Py_buffer.buf`,
:c:member:`~Py_buffer.len`, :c:member:`~Py_buffer.itemsize`, :c:member:`~Py_buffer.ndim`.


readonly, format
~~~~~~~~~~~~~~~~

Expand All @@ -253,7 +252,8 @@ readonly, format
Controls the :c:member:`~Py_buffer.readonly` field. If set, the exporter
MUST provide a writable buffer or else report failure. Otherwise, the
exporter MAY provide either a read-only or writable buffer, but the choice
MUST be consistent for all consumers.
MUST be consistent for all consumers. For example, :c:expr:`PyBUF_SIMPLE | PyBUF_WRITABLE`
can be used to request a simple writable buffer.

.. c:macro:: PyBUF_FORMAT

Expand All @@ -265,8 +265,9 @@ readonly, format
Since :c:macro:`PyBUF_SIMPLE` is defined as 0, :c:macro:`PyBUF_WRITABLE`
can be used as a stand-alone flag to request a simple writable buffer.

:c:macro:`PyBUF_FORMAT` can be \|'d to any of the flags except :c:macro:`PyBUF_SIMPLE`.
The latter already implies format ``B`` (unsigned bytes).
:c:macro:`PyBUF_FORMAT` must be \|'d to any of the flags except :c:macro:`PyBUF_SIMPLE`, because
the latter already implies format ``B`` (unsigned bytes). :c:macro:`!PyBUF_FORMAT` cannot be
used on its own.


shape, strides, suboffsets
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