Forward Iterator

#define _DEFINE_DEPRECATED_HASH_CLASSES 0
#include <iostream>
#include <hash_set>
 
using namespace std;
using namespace stdext;
 
int main
{
  hash_set <int> hs1;
  hash_set <int>::iterator hs1_Iter;
  hash_set <int>::const_iterator hs1_cIter;
 
  hs1.insert( 1 );
  hs1.insert( 2 );
  hs1.insert( 3 );
 
  hs1_Iter = hs1.begin( );
  cout <<"The first element of hs1 is "<<*hs1_Iter<<endl;
 
  hs1_Iter = hs1.begin( );
  hs1.erase( hs1_Iter );
 
  // The following 2 lines would err because the iterator is const
  // hs1_cIter = hs1.begin( );
  // hs1.erase( hs1_cIter );
 
  hs1_cIter = hs1.begin( );
  cout <<"The first element of hs1 is now "<<*hs1_cIter<<endl;
 
  return 0;
}