#include <random>
#include <iostream>
#include <tuple>
using namespace std; // 余計なコード消したらギリギリ入ったｗ
template<class First>auto sum(First first){return first;}
template<class First, class... Rest> auto sum(First first, Rest... rest){return first+sum(rest...);}
template<typename T, size_t... Seq>
auto sum_tpl_impl(const T& tpl, index_sequence<Seq...>) {return sum(get<Seq>(tpl)...);}
template<typename... Types> auto sum_tpl(const tuple<Types...>& tpl) {
return sum_tpl_impl(tpl, make_index_sequence<tuple_size<tuple<Types...>>{}>{});
}
template <typename T, typename F, T... Seq> auto gen_impl(F func, index_sequence<Seq...>) {
return make_tuple(func(Seq)...);
}
template <size_t N, typename F> auto gen(F func) {
return gen_impl<decltype((func)(0))>(func, make_index_sequence<N>{});
}
template <typename T, size_t... Seq> void print_impl(const T& tpl, index_sequence<Seq...>) {
for (auto e: {get<Seq>(tpl)...}) cout << e << endl;
}
template <typename T> void print(const T& tpl) {
print_impl(tpl, make_index_sequence<tuple_size<T>{}>{});
}
int main() {
random_device seed_gen;
mt19937 engine(seed_gen());
const size_t n = 3;
const auto tpl = gen<n>([&](size_t i){ return engine();});
print(tpl);
cout << sum_tpl(tpl) << endl;
return 0;
}