#include <iostream>
#include <string>
#include <utility>
using namespace std;
 
struct A {
  string x;
};
 
struct B {
  string x;
};
 
void func(const pair<A, B>& mypair) {
  cout << mypair.first.x << ", " << mypair.second.x << endl;
}
 
int main() {
  A a;
  a.x = "test A";
  B b;
  b.x = "test B";
 
  func(make_pair(a, b));
  cout << a.x << ", " << b.x << endl; // a and a are still here!
 
  func(make_pair(move(a), move(b)));
  cout << a.x << ", " << b.x << endl; // a and a are now reset becuase they are moved!
}
 

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