Re: std::num_put<char, char*>

[Martin Sebor <sebor at roguewave dot com>]

Eddie wrote:
> > Sure, but really you should have a reference for such things: either
> > the Standard itself (in *.pdf or book form) or a good book, there are
> > plenty.
>
> Sorry, I guess I should have mentioned that. I was going by "Standard
> C++ IOStreams and Locales" by Angelika Langer and Klaus Kreft. Page 288
> talks of that.
>
> > Exactly. You have just just install it in your locale. I'm also going
> > to make that particular instantiation faster for you ;) (but only for
> > gcc4.4.0)
>
> Well thank you :) Umm, I know you just told me this isn't a help mailing
> list. However as I'm sure you know, locales seem to be one of the
> forgotten realms of C++. The documentation is scarce and those that are
> familiar with the topic are few and far between. Anyway, how does one
> "install it in the locale"? Maybe just a point in the right direction of
> some literature? Heh, thanks.

You install a facet via the locale template ctor, like so:

#include <cassert>
#include <locale>

int main ()
{
    typedef std::num_put<char, char*> NumPut;
    const std::locale x (std::locale::classic (), new NumPut);

    assert (std::has_facet<std::num_put<char> >(x));
    assert (std::has_facet<NumPut>(x));
}

x is a copy of the classic "C" locale with the NumPut facet
added.

Martin