#include <iostream>

struct A
{
  A() : n(0) {}
  A(int x) : n(x) {}
  int n;
};

int main(int argc, char** argv) 
{ 
  // you can bind a constant reference to a temporary
  // in which case the temporary will remain for the lifetime of the reference
  const A& ar = A(3);

  std::cout << ar.n << std::endl;

  return 0; 
}