[v3] libstdc++/30127/34449

[Jonathan Wakely]

On 14/12/2007, Benjamin Kosnik <bkoz@redhat.com> wrote:
> Fixes for use_facet/has_facet: now facet hierarchy is checked, to make
> sure that use of derived-facet methods properly error when the locale
> only has the base facet.

Unless I'm missing something, these changes will affect performance
more than necessary.

In has_facet, the dynamic_cast to a pointer type cannot throw so is
the try-catch needed?

In use_facet, if the first dynamic_cast works, the second will too, so
there's no point doing it twice.

Something like this still pass the new tests.

Jon
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