...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::algorithm::is_permutation — Tests to see if the sequence [first,last) is a permutation of the sequence starting at first2.
// In header: <boost/algorithm/cxx11/is_permutation.hpp> template<typename Range, typename ForwardIterator, typename BinaryPredicate> boost::disable_if_c< boost::is_same< Range, ForwardIterator >::value, bool >::type is_permutation(const Range & r, ForwardIterator first2, BinaryPredicate pred);