1
struct pair_hash {
2
    template <class T1, class T2>
3
    ull operator()(const pair<T1, T2>& p) const {
4
        ull seed = 0;
5
        hash_combine(seed, p.first);
6
        hash_combine(seed, p.second);
7
        return seed;
8
    }
9
};

1
struct tuple_hash {
2
    template <class... Ts>
3
    ull operator()(const tuple<Ts...>& t) const {
4
        ull seed = 0;
5
        apply([&seed](const auto&... args) {
6
            (hash_combine(seed, args), ...);
7
        }, t);
8
        return seed;
9
    }
10
};
11
}