Listing 1: <iterator>, part 1

//  iterator  standard  header
#ifndef  _ITERATOR_
#define  _ITERATOR_
#include  <utility>
namespace  std  {

        //  BASIC  ITERATORS
template<class  T,  class  Dist  =  ptrdiff_t>
    struct  input_iterator  {};
struct  output_iterator  {};
template<class  T,  class  Dist  =  ptrdiff_t>
    struct  forward_iterator  {};
template<class  T,  class  Dist  =  ptrdiff_t>
    struct  bidirectional_iterator  {};
template<class  T,  class  Dist  =  ptrdiff_t>
    struct  random_access_iterator  {};
/* End of File */