#include <tuple>
#include <iostream>

using namespace std;


// tuple-returning func
auto some_func() -> tuple<int, int> {
    return make_tuple(4, 2);
}

int main() {
    auto c = make_tuple(5, 4);
    cout << get<0>(c) << endl;

    int a = 0;
    int b = 1;
    tie(a, b) = make_tuple(b, a);
    cout << a << endl;
    cout << b << endl;
    // get a,b from func ...
    tie(a, b) = some_func();
    cout << a << endl;
    cout << b << endl;
}