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gh-57089: Note _layout_ in the bitfield docs #134148

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Jun 6, 2025
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gh-57089: Note _layout_ in the bitfield docs #134148

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gh-57089: Note _layout_ in the bitfield docs
encukou May 17, 2025
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encukou Jun 6, 2025
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12 changes: 9 additions & 3 deletions Doc/library/ctypes.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -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:
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