[Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should

pcarlini at suse dot de gcc-bugzilla@gcc.gnu.org
Fri May 18 20:27:00 GMT 2007



------- Comment #98 from pcarlini at suse dot de  2007-05-18 21:27 -------
(In reply to comment #97)
> First and foremeost, we have to generate correct code.  If that means
> the memory barrier solution, for now, then so be it.

Yes, but I'm a little worried myself not by <memory> but by containers like
<list>, <map> and <set>, where we call allocator::contruct, which uses
placement new, to "install" the value in the allocated node. In that case,
unfortunately, per 20.4.1.1/12, we can't optimize it for POD types :( At
minimum we should benchmark a bit...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286



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