C++14: std::exchange()

C++14 added the template function std::exchange(). Here is an example:

#include <utility>
#include <iostream>
using namespace std;

int main()
{
  int myObject   = 1;
  int myOldValue = 0.0;
  
  myOldValue = exchange(myObject, 9);

  cout << myOldValue << " " << myObject;

  cout << endl;
  return 0;
}
// Output: 1 9

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