C++11: std::tie() – tuple unpacking

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

#include <iostream>
#include <tuple>

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

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

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