#ifndef EXTENDED_PAIR_H
#define EXTENDED_PAIR_H

template <typename T1, typename A1, typename T2, typename A2>
struct extended_pair {
  typedef T1 first_type;
  typedef T2 second_type;

  extended_pair(A1 f, A2 s) : first(f), second(s) {}

  T1 first;
  T2 second;
};

#endif