Function hash_range

extern/boost/boost/container_hash/hash.hpp:429–439

    template <class It>
    inline std::size_t hash_range(It first, It last)
    {
        std::size_t seed = 0;

        for(; first != last; ++first)
        {
            hash_combine<typename std::iterator_traits<It>::value_type>(seed, *first);
        }

        return seed;
    }

    template <class It>
    inline void hash_range(std::size_t& seed, It first, It last)