#pragma once

#include <stdtypedefs.h>
#include <string>

namespace std {
  // Iterator tags
  struct input_iterator_tag {};
  struct output_iterator_tag {};
  struct forward_iterator_tag : public input_iterator_tag {};
  struct bidirectional_iterator_tag : public forward_iterator_tag {};
  struct random_access_iterator_tag : public bidirectional_iterator_tag {};

  // Iterator traits
  template<class Iterator> struct iterator_traits {
    typedef typename Iterator::difference_type difference_type;
    typedef typename Iterator::value_type value_type;
    typedef typename Iterator::pointer pointer;
    typedef typename Iterator::reference reference;
    typedef typename Iterator::iterator_category iterator_category;
  };

  template<class T> struct iterator_traits<T*> {
    typedef ptrdiff_t difference_type;
    typedef T value_type;
    typedef T *pointer;
    typedef T &reference;
    typedef random_access_iterator_tag iterator_category;
  };

  template<class T> struct iterator_traits<const T*> {
    typedef ptrdiff_t difference_type;
    typedef T value_type;
    typedef const T *pointer;
    typedef const T &reference;
    typedef random_access_iterator_tag iterator_category;
  };

  // Iterators
  template<class Category, class T, class Distance = ptrdiff_t,
           class Pointer = T*, class Reference = T&> struct iterator {
    typedef T value_type;
    typedef Distance difference_type;
    typedef Pointer pointer;
    typedef Reference reference;
    typedef Category iterator_category;
  };

  template<class Iterator>
  class reverse_iterator : public
    iterator<typename iterator_traits<Iterator>::iterator_category,
             typename iterator_traits<Iterator>::value_type,
             typename iterator_traits<Iterator>::difference_type,
             typename iterator_traits<Iterator>::pointer,
             typename iterator_traits<Iterator>::reference> {
  public:
    typedef Iterator iterator_type;
    typedef typename iterator_traits<Iterator>::difference_type difference_type;
    typedef typename iterator_traits<Iterator>::reference reference;
    typedef typename iterator_traits<Iterator>::pointer pointer;
  };

  template<class T, class charT = char, class traits = char_traits<charT>,
            class Distance = ptrdiff_t>
    class istream_iterator;

  template<class T, class charT = char, class traits = char_traits<charT>>
    class ostream_iterator;

  template<class charT, class traits = char_traits<charT>>
    class istreambuf_iterator;
  template <class charT, class traits = char_traits<charT>>
    class ostreambuf_iterator;
};