[Bug libstdc++/50714] codecvt_byname::codecvt::_M_c_locale_codecvt not initialized by destroyed

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50714

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-14 10:14:10 UTC ---
The testcase is invalid, std types can only be specialized for user-defined
types.  It can be made valid by:

#include <ext/pod_char_traits.h>

#define mychar __gnu_cxx::character<unsigned short, int>




> It's also odd to not destroy or initialize(!) the locale in codecvt_byname
> if the requested locale is "C" or "POSIX".  Thus I suppose using
> 
>       explicit
>       codecvt_byname(const char* __s, size_t __refs = 0)
>       : codecvt<_InternT, _ExternT, _StateT>("C", __refs)
> 
> (well, with a proper __c_locale object for "C") would be even better?

Or simply initialize it in the primary template the same way the
specializations do it, with _S_get_c_locale()