time_put facet implementation

[Sam Varshavchik]

Paolo Carlini writes:

> Why do you think you can't instantiate it? Definitely you can, eg, this
> works fine:
> 
> #include <locale>
> #include <iterator>
> 
> struct my_facet
> : std::time_put<char, std::ostream_iterator<char> >
> {
>   my_facet() { }
> };
> 
> my_facet tp;
> 
> Note: one thing is *instantiating* the facet, per Table 52, another
> thing finding it installed in a given locale: in the latter case Table
> 51 applies, which concerns only ostreambuf_iterator based facets.

That's what I meant -- I was getting a bad cast when invoking 
std::use_facet< std::time_put<char, std::ostream_iterator<char> > >(loc).

Thanks for pointing me in the right direction.
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