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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 #134148

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12 changes: 9 additions & 3 deletions 12 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 is not
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It is important to note that bit field allocation and layout in memory is not
It is important to note that bit field allocation and layout in memory are not

Subject consists of two parts

defined as a C standard; its implementation is compiler-specific.
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defined as a C standard; its implementation is compiler-specific.
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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