[v3] Fix libstdc++/40497

[Jonathan Wakely]

2009/6/20 Paolo Carlini:

> 2009-06-20  Paolo Carlini  <paolo.carlini@oracle.com>
>
>        PR libstdc++/40497
>        * include/bits/stl_iterator_base_funcs.h (next, prev): Fix the
>        signature per the current C++1x draft (N2857).
>        * testsuite/24_iterators/operations/40497.cc: Add.

Doesn't that signature rely on concepts to find difference_type, and
so without concepts won't work for pointers?

#include <iterator>

int main()
{
  int arr[2] = { };
  int* i = arr;
  return *std::next(i);
}