[Bug libstdc++/31247] std::vector::iterator::value_type is accessible

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31247

--- Comment #13 from Marc Glisse <marc.glisse at normalesup dot org> 2011-10-28 10:18:43 UTC ---
(In reply to comment #12)
> (In reply to comment #10)
> > An iterator is either a pointer or a class with the
> > typedefs.
> 
> Or a type for which iterator_traits has been specialized?

Yes. Sadly, that's not portably detectable. The 2 categories above are those
that can be tested. And having a private iterator_category completely breaks
sfinae in C++03.