template PairTemplate (T,S){
    class Pair {
    
        public T first;
        public S second;


        this (T first_val, S second_val){
          first = first_val;
          second = second_val;
        }
        

        public void set_first (T val){
          first = val;
        }
        
        public void set_second(S val){
          second = val;
        }
    }
}

int main(){
  alias instance PairTemplate(int,int).Pair IntPair;
  IntPair a_pair = new IntPair(1, 2);
  printf("pair.first = %d, pair.second = %d\n", 
         a_pair.first, a_pair.second);
  return 0;
}