https://github.com/python/cpython/commit/f32c7b9100e210a20000c431f8139437f403c88f
commit: f32c7b9100e210a20000c431f8139437f403c88f
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: encukou <encu...@gmail.com>
date: 2025-06-06T14:58:48Z
summary:
[3.14] gh-57089: Note _layout_ in the bitfield docs (GH-134148) (GH-135216)
(cherry picked from commit b22b964a5c245e13ae0439c5efbb8984acf607ab)
Co-authored-by: Petr Viktorin <encu...@gmail.com>
Co-authored-by: Meador Inge <mead...@gmail.com>
Co-authored-by: Stan Ulbrych <89152624+stanfromirel...@users.noreply.github.com>
files:
M Doc/library/ctypes.rst
diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index 8e74c6c9dee744..2ee4450698a107 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -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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