C++11: std::tie() – tuple packing

The function template std::tie() allows you to pack a tuple. Here is an example:

#include <iostream>
#include <tuple>

int main()
{
  int                                  a = 1  ;
  double                               b = 2.2;
  int                                  c = 3  ;
  double                               d = 4.4;
  std::tuple<int, double, int, double> myTuple;

  myTuple = std::tie(a, b, c, d);
  std::cout << std::get<0>(myTuple) << " "; // 1
  std::cout << std::get<1>(myTuple) << " "; // 2.0
  std::cout << std::get<2>(myTuple) << " "; // 3
  std::cout << std::get<3>(myTuple) << " "; // 4.0
  std::cout << std::endl;
  return 0;
}
// Output: 1 2.2 3 4.4

Reference: http://en.cppreference.com/w/cpp/utility/tuple