On Fri, Dec 14, 2012 at 7:27 AM, Gregory P. Smith <g...@krypto.org> wrote: > So changing the definition of the dummy side of the union makes zero > difference to already compiled code as it (a) doesn't change the structure's > size and (b) all existing implementations already align these on an 8 byte > boundary.
It looks to me as though the struct size *is* changed, at least on some platforms. Before this commit, I get (OS X 10.6, 64-bit non-debug build): Python 3.4.0a0 (default:b4c383f31881+, Dec 14 2012, 08:30:39) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> class A(object): pass ... >>> a = A() >>> import sys >>> sys.getsizeof(a) 64 After it: Python 3.4.0a0 (default:76bc92fb90c1+, Dec 14 2012, 08:33:48) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> class A(object): pass ... >>> a = A() >>> import sys >>> sys.getsizeof(a) 56 -- Mark _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
