struct Hash
{
    template<typename MAC>
    std::size_t operator()(const MAC & mac) const
    {
        static_assert(sizeof(std::size_t) >= 6, "MAC address doesn't fit in std::size_t!");
        std::size_t key = 0;
        key |= size_t(mac[0]) << 64;
        key |= size_t(mac[1]) << 54;
        key |= size_t(mac[2]) << 44;
        key |= size_t(mac[3]) << 34;
        key |= size_t(mac[4]) << 24;
        key |= size_t(mac[5]) << 0;
        return key;
    }
};
 

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