is_permutation code for cxx14 is broken

[dsp@…]

1) Lines 59/61 refer to some macro "_VSTD" unknown to my compiler (Visual Studio 2012):

diff1_t len1 = _VSTD::distance(first1, last1);

Presumably "_VSTD" should be replaced by "std".

2) Lines 114/115 refer to some unqualified iterator_traits:

typedef typename iterator_traits<_ForwardIterator1>::value_type value1_t;

Presumably a "std::" prefix is missing here.

[Marshall Clow]

I have messed this up to a fare-thee-well.

Besides the problems that you've noted, there are _two_ versions of the four iterator calls to is_permutation; one in the cxx11 header and one in the cxx14 header.

And neither of them checks to see if the standard library implements this call.

And there's some weirdness in the git conversion that I have to sort out first.

[Marshall Clow]

Fixed in cf249c090c3021faebbcf5f6cf5574ce258aa7f6