#include <functional>
 #include <iostream>
 #include <tuple>

 int main(){

   std::cout << std::endl;

   int first= 1;
   int second= 2;
   int third= 3;
   int fourth= 4;

   auto tup= std::tie(first,second,third,fourth)= std::make_tuple(1001,1002,1003,1004);

   std::cout << "tup: (" << std::get<0>(tup) << "," << std::get<1>(tup) << "," << std::get<2>(tup) << "," << std::get<3>(tup) << ")" << std::endl;
   std::cout << "variables: " << first << " " << second << " " << third << " " << fourth << std::endl;

   std::cout << std::endl;

   first= 1;
   std::cout << "std::get<0>(tup): " << std::get<0>(tup) << std::endl;

   std::cout << std::endl;

   int a;
   int b;

   std::tie(std::ignore,a,std::ignore,b)= tup;

   std::cout << "a: " << a << std::endl;
   std::cout << "b: " << b << std::endl;

   std::cout << std::endl;
 }