cash to hash

main.cpp

namespace std {
    template<>
    class hash<Key> {
    public:
        size_t operator()(const Key& s) const
        {
            mt19937_64 generator{random_device()()};
            uniform_int_distribution<unsigned> distribution(1, 8);

           unsigned i1 = static_cast<const unsigned &>(s.second.first * 1000);
           unsigned i2 = static_cast<const unsigned &>(s.second.second * 1000);

            unsigned i3 = static_cast<const unsigned &>(s.first.length());

            unsigned hash1_1 = 0x82568325;
            unsigned hash1_2 = 0x47626962;
            unsigned hash1_3 = 0x57583014;
            hash1_1+=hash1_2*8+_rotr(i1, distribution(generator));
            hash1_2+=hash1_1*8+_rotr(i2, distribution(generator));
            hash1_3= (hash1_1 * hash1_2)+_rotr(i3, distribution(generator));
//            hash1_1+=hash1_2*8+_rotr(i1, 8);
//            hash1_2+=hash1_1*8+_rotr(i2, 8);
//            hash1_3= (hash1_1 * hash1_2)+_rotr(i3, 8);
            unsigned hash1 = hash1_3 ^ hash1_1 ^ hash1_2;

            return  hash1;
        }
    };
}