[Bug libstdc++/42832] Revisit std::function for aliasing issues

["rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from rguenther at suse dot de  2010-01-25 16:29 -------
Subject: Re:  Revisit std::function for aliasing
 issues

On Mon, 25 Jan 2010, paolo dot carlini at oracle dot com wrote:

> ------- Comment #5 from paolo dot carlini at oracle dot com  2010-01-25 10:10 -------
> Ok, I see that asking was a good idea, the tangle of issues is quite complex.
> Anyway, this is my current proposal: let' use for now your mildly optimized and
> in any case correct solution using a loop of char-wise std::swap, the first
> solution you proposed on the gcc-patches discussion. For both std and tr1.
> Likely tr1 will stay like that forever. Let's remove the dependency of this bug
> on the overzealous memcpy optimization bug and the blocking of the optimization
> issue which started this discussion; let's add instead dependency on the
> "uninitialized_swap" enhancement. Let's keep the present bug open of course, as
> enhancement.
> 
> Are you willing to prepare a patch including a comment, better two different
> comments one simpler for the tr1 version and one slightly longer for the std
> version? 

I'll let the dust settle a bit on the gcc-patches discussion;  I can
then post a patch along the above lines.

Thanks,
Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42832