On Sat, Nov 12, 2011 at 4:43 PM, Hans-Christoph Steiner <[email protected]> wrote:
> In the case of type-punning, I think that code should be replaced with > something that uses a different technique rather than making separate type > punning for 32 and 64 bits. I think unions can be used in many of those > situations. Type punning is very deprecated and not allowed in the C99 > standard (which is 12 years old). Yes I replace all type punning with unions, in the way PD_BIGORSMALL is defined in Pd-extended and Pd-double. It is a kind of 'legitimate type punning', still a way to access a float variable as an int, and Qt devs reportedly had problems with such a method. See http://labs.qt.nokia.com/2011/06/10/type-punning-and-strict-aliasing/. I've also experimented with memcpy(), this is completely safe, and not expensive because memcpy() translates to a single instruction for a float or double. But the disadvantage is, it needs <string.h>, and I did not want to include <string.h> in m_pd.h because it would be included in every executable then. Katja _______________________________________________ Pd-dev mailing list [email protected] http://lists.puredata.info/listinfo/pd-dev
