// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
        template <class T>
        constexpr T fnv(LPCSTR _str, bool mode1a = false)
        {
            T hash, offset, prime;

            // Resolve the proper values for hashing
            switch (sizeof(T))
            {
                case 4:
                    prime = 16777619ul;
                    hash = offset = 2166136261ul;
                    break;

                case 8:
                    prime = 1099511628211ull;
                    hash = offset = 14695981039346656037ull;
                    break;
            }

            do      hash = mode1a ? ((hash ^ static_cast<T>(*_str)) * prime) : ((hash * prime) ^ static_cast<T>(*_str));
            while (*_str++ != '\0');

            return hash;
        }