Boost C++ Libraries

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Header <boost/algorithm/cxx14/is_permutation.hpp>

namespace boost {
  namespace algorithm {
    template<typename ForwardIterator1, typename ForwardIterator2>
      bool is_permutation(ForwardIterator1, ForwardIterator1,
                          ForwardIterator2, ForwardIterator2);
    template<typename ForwardIterator1, typename ForwardIterator2,
             typename BinaryPredicate>
      bool is_permutation(ForwardIterator1, ForwardIterator1,
                          ForwardIterator2, ForwardIterator2,
                          BinaryPredicate);
  }
}