#include <iostream>
#include "boost/type_traits/add_reference.hpp"

template <typename T1, typename T2> 
struct foopair 
{
  typedef T1 first_type;
  typedef T2 second_type;

  T1 first;
  T2 second;

  foopair(typename boost::add_reference<const T1>::type nfirst,
       typename boost::add_reference<const T2>::type nsecond)
    :first(nfirst), second(nsecond) { }
};

using namespace std;

int main() {
  int i=5;
  char j='a';
  foopair<int&,char&> ij( i, j);

  cout << "i = " << i << endl;
  cout << "j = " << j << endl;  
  cout << "ij.first= " << ij.first << endl;
  cout << "ij.second= " << ij.second << endl;

  i = 10;
  j = 'c';
  cout << "i = " << i << endl;
  cout << "j = " << j << endl;  
  cout << "ij.first= " << ij.first << endl;
  cout << "ij.second= " << ij.second << endl;


  return 0;
}