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gh-57089: Note _layout_ in the bitfield docs (GH-134148)

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Co-authored-by: Meador Inge <meadori@gmail.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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Petr Viktorin 2025-06-06 16:51:40 +02:00 committed by GitHub
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Doc/library/ctypes.rst
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@ -714,10 +714,16 @@ item in the :attr:`~Structure._fields_` tuples::
... ("second_16", c_int, 16)]
...
>>> print(Int.first_16)
<Field type=c_long, ofs=0:0, bits=16>
<ctypes.CField 'first_16' type=c_int, ofs=0, bit_size=16, bit_offset=0>
>>> print(Int.second_16)
<Field type=c_long, ofs=0:16, bits=16>
>>>
<ctypes.CField 'second_16' type=c_int, ofs=0, bit_size=16, bit_offset=16>
It is important to note that bit field allocation and layout in memory are not
defined as a C standard; their implementation is compiler-specific.
By default, Python will attempt to match the behavior of a "native" compiler
for the current platform.
See the :attr:`~Structure._layout_` attribute for details on the default
behavior and how to change it.
.. _ctypes-arrays: