[Bug libstdc++/64649] regex_traits::lookup_classname() only works with random access iterators

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64649

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-01-17
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Actually it's even worse than that, the next line will only work with pointers
and not even arbitrary random access iterators:

      __fctyp.narrow(__first, __last, '?', &*__s.begin());

The signature of ctype<charT>::narrow is

  const charT*
  ctype<charT>::narrow(const charT*, const charT*, char, char*) const;

So __first and __last are not acceptable arguments.