Re: Segfault in simple use of codecvt<>

["Kristian Spangsege" <kristian dot spangsege at gmail dot com>]

Turns out it's not limited to the 'codecvt' facet. The same type of
problem occurs with the 'ctype' facet.

On 1/12/08, Kristian Spangsege <kristian.spangsege@gmail.com> wrote:
> The code:
>
> > #include <cwchar>
> > #include <locale>
> >
> > int main()
> > {
> >   typedef std::codecvt<wchar_t, char, std::mbstate_t> cvt_type;
> >   cvt_type const &cvt = std::use_facet<cvt_type>(std::locale("en_US"));
> >   cvt.encoding();
> >   return 0;
> > }
>
> System:
>
> gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-51)
>
> Fedora Core release 6 (Zod)
>
> Linux localhost.localdomain 2.6.20-1.2952.fc6 #1 SMP Wed May 16
> 18:59:18 EDT 2007 i686 i686 i386 GNU/Linux
>
> I specify no flags when compiling.
>
>
> The code works if I leave out "en_US":
>
> >   cvt_type const &cvt = std::use_facet<cvt_type>(std::locale());
> >   cvt.encoding();
>
>
> It also works if the passed locale is not a temporary:
>
> >   std::locale l("en_US");
> >   cvt_type const &cvt = std::use_facet<cvt_type>(l);
> >   cvt.encoding();
>
>
> And if 'encoding' is called directly on the returned facet:
>
> >   std::use_facet<cvt_type>(std::locale("en_US")).encoding();
>
>
> As far as I know, a temporary is supposed to stay "alive" until the
> end of the scope.
>
> Regards,
> Kristian
>


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