/*

  *

  * Copyright (c) 1994

  * Hewlett-Packard Company

  *

  * Copyright (c) 1996-1998

  * Silicon Graphics Computer Systems, Inc.

  *

  * Copyright (c) 1997

  * Moscow Center for SPARC Technology

  *

  * Copyright (c) 1999 

  * Boris Fomitchev

  *

  * This material is provided "as is", with absolutely no warranty expressed

  * or implied. Any use is at your own risk.

  *

  * Permission to use or copy this software for any purpose is hereby granted 

  * without fee, provided the above notices are retained on all copies.

  * Permission to modify the code and to distribute modified code is granted,

  * provided the above notices are retained, and a notice that the code was

  * modified is included with the above copyright notice.

  *

  */

 /* NOTE: This is an internal header file, included by other STL headers.

  *   You should not attempt to use it directly.

  */

 #ifndef _STLP_INTERNAL_ITERATOR_H

 #define _STLP_INTERNAL_ITERATOR_H

 #ifndef _STLP_INTERNAL_ITERATOR_BASE_H

 # include <stl/_iterator_base.h>

 #endif

 _STLP_BEGIN_NAMESPACE

 #if defined ( _STLP_CLASS_PARTIAL_SPECIALIZATION )

 // This is the new version of reverse_iterator, as defined in the

 //  draft C++ standard.  It relies on the iterator_traits template,

 //  which in turn relies on partial specialization.  The class

 //  reverse_bidirectional_iterator is no longer part of the draft

 //  standard, but it is retained for backward compatibility.

 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>

 {

 protected:

   _Iterator current;

   typedef reverse_iterator<_Iterator> _Self;

 public:

   typedef typename iterator_traits<_Iterator>::iterator_category  iterator_category;

   typedef typename iterator_traits<_Iterator>::value_type value_type;

   typedef typename iterator_traits<_Iterator>::difference_type difference_type;

   typedef typename iterator_traits<_Iterator>::pointer pointer;

   typedef typename iterator_traits<_Iterator>::reference reference;

   typedef _Iterator iterator_type;

 public:

   reverse_iterator() {}

   explicit reverse_iterator(iterator_type __x) : current(__x) {}

   reverse_iterator(const _Self& __x) : current(__x.current) {}

   _Self& operator = (const _Self& __x) { current = __x.base(); return *this; } 

 #ifdef _STLP_MEMBER_TEMPLATES

   template <class _Iter>

   reverse_iterator(const reverse_iterator<_Iter>& __x) : current(__x.base()) {}

   template <class _Iter>

   _Self& operator = (const reverse_iterator<_Iter>& __x) { current = __x.base(); return *this; } 

 #endif /* _STLP_MEMBER_TEMPLATES */

   iterator_type base() const { return current; }

   reference operator*() const {

     _Iterator __tmp = current;

     return *--__tmp;

   }

   _STLP_DEFINE_ARROW_OPERATOR

   _Self& operator++() {

     --current;

     return *this;

   }

   _Self operator++(int) {

     _Self __tmp = *this;

     --current;

     return __tmp;

   }

   _Self& operator--() {

     ++current;

     return *this;

   }

   _Self operator--(int) {

     _Self __tmp = *this;

     ++current;

     return __tmp;

   }

   _Self operator+(difference_type __n) const {

     return _Self(current - __n);

   }

   _Self& operator+=(difference_type __n) {

     current -= __n;

     return *this;

   }

   _Self operator-(difference_type __n) const {

     return _Self(current + __n);

   }

   _Self& operator-=(difference_type __n) {

     current += __n;

     return *this;

   }

   reference operator[](difference_type __n) const { return *(*this + __n); }  

 }; 

 template <class _Iterator>

 inline bool  _STLP_CALL operator==(const reverse_iterator<_Iterator>& __x, 

                        const reverse_iterator<_Iterator>& __y) {

   return __x.base() == __y.base();

 }

 template <class _Iterator>

 inline bool _STLP_CALL operator<(const reverse_iterator<_Iterator>& __x, 

                       const reverse_iterator<_Iterator>& __y) {

   return __y.base() < __x.base();

 }

 #ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE

 template <class _Iterator>

 inline bool _STLP_CALL operator!=(const reverse_iterator<_Iterator>& __x, 

                        const reverse_iterator<_Iterator>& __y) {

   return !(__x == __y);

 }

 template <class _Iterator>

 inline bool _STLP_CALL operator>(const reverse_iterator<_Iterator>& __x, 

                       const reverse_iterator<_Iterator>& __y) {

   return __y < __x;

 }

 template <class _Iterator>

 inline bool _STLP_CALL operator<=(const reverse_iterator<_Iterator>& __x, 

                        const reverse_iterator<_Iterator>& __y) {

   return !(__y < __x);

 }

 template <class _Iterator>

 inline bool _STLP_CALL operator>=(const reverse_iterator<_Iterator>& __x, 

                       const reverse_iterator<_Iterator>& __y) {

   return !(__x < __y);

 }

 #endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */

 template <class _Iterator>

 # ifdef __SUNPRO_CC

 inline ptrdiff_t _STLP_CALL

 # else

 inline typename reverse_iterator<_Iterator>::difference_type _STLP_CALL

 # endif

 operator-(const reverse_iterator<_Iterator>& __x, 

           const reverse_iterator<_Iterator>& __y) {

   return __y.base() - __x.base();

 }

 template <class _Iterator, class _DifferenceType>

 inline reverse_iterator<_Iterator>  _STLP_CALL

 operator+(_DifferenceType n,const reverse_iterator<_Iterator>& x) {

   return x.operator+(n);

 }

 # endif

 template <class _Container>

 class back_insert_iterator 

   : public iterator<output_iterator_tag,void,void,void,void>

 {

 protected:

   _Container* container;

 public:

   typedef _Container          container_type;

   typedef output_iterator_tag iterator_category;

   explicit back_insert_iterator(_Container& __x) : container(&__x) {}

   back_insert_iterator<_Container>&

   operator=(const typename _Container::value_type& __val) { 

     container->push_back(__val);

     return *this;

   }

   back_insert_iterator<_Container>& operator*() { return *this; }

   back_insert_iterator<_Container>& operator++() { return *this; }

   back_insert_iterator<_Container>  operator++(int) { return *this; }

 };

 template <class _Container>

 inline back_insert_iterator<_Container>  _STLP_CALL back_inserter(_Container& __x) {

   return back_insert_iterator<_Container>(__x);

 }

 template <class _Container>

 class front_insert_iterator 

   : public iterator<output_iterator_tag,void,void,void,void>

 {

 protected:

   _Container* container;

 public:

   typedef _Container          container_type;

   typedef output_iterator_tag iterator_category;

   explicit front_insert_iterator(_Container& __x) : container(&__x) {}

   front_insert_iterator<_Container>&

   operator=(const typename _Container::value_type& __val) { 

     container->push_front(__val);

     return *this;

   }

   front_insert_iterator<_Container>& operator*() { return *this; }

   front_insert_iterator<_Container>& operator++() { return *this; }

   front_insert_iterator<_Container>& operator++(int) { return *this; }

 };

 template <class _Container>

 inline front_insert_iterator<_Container>  _STLP_CALL front_inserter(_Container& __x) {

   return front_insert_iterator<_Container>(__x);

 }

 template <class _Container>

 class insert_iterator 

   : public iterator<output_iterator_tag,void,void,void,void>

 {

 protected:

   _Container* container;

   typename _Container::iterator iter;

 public:

   typedef _Container          container_type;

   typedef output_iterator_tag iterator_category;

   insert_iterator(_Container& __x, typename _Container::iterator __i) 

     : container(&__x), iter(__i) {}

   insert_iterator<_Container>&

   operator=(const typename _Container::value_type& __val) { 

     iter = container->insert(iter, __val);

     ++iter;

     return *this;

   }

   insert_iterator<_Container>& operator*() { return *this; }

   insert_iterator<_Container>& operator++() { return *this; }

   insert_iterator<_Container>& operator++(int) { return *this; }

 };

 template <class _Container, class _Iterator>

 inline insert_iterator<_Container>  _STLP_CALL

 inserter(_Container& __x, _Iterator __i)

 {

   typedef typename _Container::iterator __iter;

   return insert_iterator<_Container>(__x, __iter(__i));

 }

 _STLP_END_NAMESPACE

 #if ! defined ( _STLP_CLASS_PARTIAL_SPECIALIZATION ) || defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)

 # include <stl/_iterator_old.h>

 #endif /* __NO_PARTIAL_SPEC || ANACHRONISMS */

 #endif /* _STLP_INTERNAL_ITERATOR_H */

 // Local Variables:

 // mode:C++

 // End: