#include <tuple>
#include <iostream>
 
template<class ...Ts>
std::tuple<Ts&...> multi_ret(Ts&... Vs) {
    return std::tuple<Ts&...>(Vs...);
}
 
//{r, theta} = cart2pol(x,y)
std::tuple<int, char> cart2pol(int x, char y) {
    return std::tuple<int, char>(x, y);
}
 
int main() {
    int x = 4;
    char y = '4';
    int r = 0;
    char theta = 0;
    multi_ret(r, theta) = cart2pol(x, y);
    std::cout << r << ' ' << theta << '\n';
    return 0;
}

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