text: #include <stl/algorithm>
  #include <stl/hash_set>
  #include <stdio.h>
  
  using namespace stl;
  
  int main ()
  {
    printf ("Results of hset2_test:\n");  
    
    hash_set<int> s;
    
    pair<hash_set<int>::const_iterator,bool> p = s.insert (42);
    
    printf (p.second?"Inserted new element %d\n":"Existing element = %d\n",*p.first);
  
    p = s.insert(42);
    
    printf (p.second?"Inserted new element %d\n":"Existing element = %d\n",*p.first);    
  
    return 0;
  }
  