Function combine

Source/Utils/json.hpp:4595–4599

boost::hash_combine

        // boost::hash_combine
        inline std::size_t combine(std::size_t seed, std::size_t h) noexcept
        {
            seed ^= h + 0x9e3779b9 + (seed << 6U) + (seed >> 2U);
            return seed;
        }

        /*!
        @brief hash a JSON value