id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12806	flat_map.hpp function force_copy break strict-aliasing on gcc < 4.4	Vladislav <phprus@…>	Ion Gaztañaga	"Hello!

On function ([https://github.com/boostorg/container/blob/develop/include/boost/container/flat_map.hpp#L61]):

{{{
template<class D, class S>
BOOST_CONTAINER_FORCEINLINE static D force_copy(S s)
{
   D *vp = reinterpret_cast<D *>(&s);
   return D(*vp);
}
}}}

gcc 4.3.4 (SLE 11) produced wrong code.
It seems that the compiler does not create a copy of an object ""s"" and returns an object of D().

If I change the signature of function on ""BOOST_CONTAINER_FORCEINLINE static D force_copy(const S& s)"" the code works and the tests pass. But then does not create a copy of an object ""s"" in a function call.

I'm not sure that this change is correct.
Is there any other workaround for this problem with a compiler gcc 4.3 or better disable strict-aliasing?
"	Bugs	new	To Be Determined	container	Boost 1.63.0	Showstopper