Author: Armin Rigo <[email protected]>
Branch:
Changeset: r2803:0e25c5c3fa14
Date: 2016-10-29 16:02 +0200
http://bitbucket.org/cffi/cffi/changeset/0e25c5c3fa14/
Log: Add a note
diff --git a/doc/source/ref.rst b/doc/source/ref.rst
--- a/doc/source/ref.rst
+++ b/doc/source/ref.rst
@@ -262,7 +262,9 @@
``p`` was returned by ``ffi.new("struct foo *", ...)``, then
``ffi.sizeof(p[0])`` now returns the total allocated size. In previous
versions, it used to just return ``ffi.sizeof(ffi.typeof(p[0]))``, which
-is the size of the structure ignoring the variable-sized part.
+is the size of the structure ignoring the variable-sized part. (Note
+that due to alignment, it is possible for ``ffi.sizeof(p[0])`` to return
+a value smaller than ``ffi.sizeof(ffi.typeof(p[0]))``.)
**ffi.alignof("C type")**: return the natural alignment size in bytes of
the argument. Corresponds to the ``__alignof__`` operator in GCC.
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