williamr@2: /*
williamr@2:  *
williamr@2:  * Copyright (c) 1994
williamr@2:  * Hewlett-Packard Company
williamr@2:  *
williamr@2:  * Copyright (c) 1996-1998
williamr@2:  * Silicon Graphics Computer Systems, Inc.
williamr@2:  *
williamr@2:  * Copyright (c) 1997
williamr@2:  * Moscow Center for SPARC Technology
williamr@2:  *
williamr@2:  * Copyright (c) 1999 
williamr@2:  * Boris Fomitchev
williamr@2:  *
williamr@2:  * This material is provided "as is", with absolutely no warranty expressed
williamr@2:  * or implied. Any use is at your own risk.
williamr@2:  *
williamr@2:  * Permission to use or copy this software for any purpose is hereby granted 
williamr@2:  * without fee, provided the above notices are retained on all copies.
williamr@2:  * Permission to modify the code and to distribute modified code is granted,
williamr@2:  * provided the above notices are retained, and a notice that the code was
williamr@2:  * modified is included with the above copyright notice.
williamr@2:  *
williamr@2:  */
williamr@2: 
williamr@2: /* NOTE: This is an internal header file, included by other STL headers.
williamr@2:  *   You should not attempt to use it directly.
williamr@2:  */
williamr@2: 
williamr@2: #ifndef _STLP_INTERNAL_ITERATOR_H
williamr@2: #define _STLP_INTERNAL_ITERATOR_H
williamr@2: 
williamr@2: #ifndef _STLP_INTERNAL_ITERATOR_BASE_H
williamr@2: # include <stl/_iterator_base.h>
williamr@2: #endif
williamr@2: 
williamr@2: _STLP_BEGIN_NAMESPACE
williamr@2: 
williamr@2: #if defined ( _STLP_CLASS_PARTIAL_SPECIALIZATION )
williamr@2: // This is the new version of reverse_iterator, as defined in the
williamr@2: //  draft C++ standard.  It relies on the iterator_traits template,
williamr@2: //  which in turn relies on partial specialization.  The class
williamr@2: //  reverse_bidirectional_iterator is no longer part of the draft
williamr@2: //  standard, but it is retained for backward compatibility.
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: class reverse_iterator : 
williamr@2:   public iterator<typename iterator_traits<_Iterator>::iterator_category,
williamr@2:                   typename iterator_traits<_Iterator>::value_type,
williamr@2:                   typename iterator_traits<_Iterator>::difference_type,
williamr@2:                   typename iterator_traits<_Iterator>::pointer,
williamr@2:                   typename iterator_traits<_Iterator>::reference>
williamr@2: {
williamr@2: protected:
williamr@2:   _Iterator current;
williamr@2:   typedef reverse_iterator<_Iterator> _Self;
williamr@2: public:
williamr@2:   typedef typename iterator_traits<_Iterator>::iterator_category  iterator_category;
williamr@2:   typedef typename iterator_traits<_Iterator>::value_type value_type;
williamr@2:   typedef typename iterator_traits<_Iterator>::difference_type difference_type;
williamr@2:   typedef typename iterator_traits<_Iterator>::pointer pointer;
williamr@2:   typedef typename iterator_traits<_Iterator>::reference reference;
williamr@2:   typedef _Iterator iterator_type;
williamr@2: public:
williamr@2:   reverse_iterator() {}
williamr@2:   explicit reverse_iterator(iterator_type __x) : current(__x) {}
williamr@2:   reverse_iterator(const _Self& __x) : current(__x.current) {}
williamr@2:   _Self& operator = (const _Self& __x) { current = __x.base(); return *this; } 
williamr@2: #ifdef _STLP_MEMBER_TEMPLATES
williamr@2:   template <class _Iter>
williamr@2:   reverse_iterator(const reverse_iterator<_Iter>& __x) : current(__x.base()) {}
williamr@2:   template <class _Iter>
williamr@2:   _Self& operator = (const reverse_iterator<_Iter>& __x) { current = __x.base(); return *this; } 
williamr@2: #endif /* _STLP_MEMBER_TEMPLATES */
williamr@2:     
williamr@2:   iterator_type base() const { return current; }
williamr@2:   reference operator*() const {
williamr@2:     _Iterator __tmp = current;
williamr@2:     return *--__tmp;
williamr@2:   }
williamr@2:   _STLP_DEFINE_ARROW_OPERATOR
williamr@2:   _Self& operator++() {
williamr@2:     --current;
williamr@2:     return *this;
williamr@2:   }
williamr@2:   _Self operator++(int) {
williamr@2:     _Self __tmp = *this;
williamr@2:     --current;
williamr@2:     return __tmp;
williamr@2:   }
williamr@2:   _Self& operator--() {
williamr@2:     ++current;
williamr@2:     return *this;
williamr@2:   }
williamr@2:   _Self operator--(int) {
williamr@2:     _Self __tmp = *this;
williamr@2:     ++current;
williamr@2:     return __tmp;
williamr@2:   }
williamr@2: 
williamr@2:   _Self operator+(difference_type __n) const {
williamr@2:     return _Self(current - __n);
williamr@2:   }
williamr@2:   _Self& operator+=(difference_type __n) {
williamr@2:     current -= __n;
williamr@2:     return *this;
williamr@2:   }
williamr@2:   _Self operator-(difference_type __n) const {
williamr@2:     return _Self(current + __n);
williamr@2:   }
williamr@2:   _Self& operator-=(difference_type __n) {
williamr@2:     current += __n;
williamr@2:     return *this;
williamr@2:   }
williamr@2:   reference operator[](difference_type __n) const { return *(*this + __n); }  
williamr@2: }; 
williamr@2:  
williamr@2: template <class _Iterator>
williamr@2: inline bool  _STLP_CALL operator==(const reverse_iterator<_Iterator>& __x, 
williamr@2:                        const reverse_iterator<_Iterator>& __y) {
williamr@2:   return __x.base() == __y.base();
williamr@2: }
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: inline bool _STLP_CALL operator<(const reverse_iterator<_Iterator>& __x, 
williamr@2:                       const reverse_iterator<_Iterator>& __y) {
williamr@2:   return __y.base() < __x.base();
williamr@2: }
williamr@2: 
williamr@2: #ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: inline bool _STLP_CALL operator!=(const reverse_iterator<_Iterator>& __x, 
williamr@2:                        const reverse_iterator<_Iterator>& __y) {
williamr@2:   return !(__x == __y);
williamr@2: }
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: inline bool _STLP_CALL operator>(const reverse_iterator<_Iterator>& __x, 
williamr@2:                       const reverse_iterator<_Iterator>& __y) {
williamr@2:   return __y < __x;
williamr@2: }
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: inline bool _STLP_CALL operator<=(const reverse_iterator<_Iterator>& __x, 
williamr@2:                        const reverse_iterator<_Iterator>& __y) {
williamr@2:   return !(__y < __x);
williamr@2: }
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: inline bool _STLP_CALL operator>=(const reverse_iterator<_Iterator>& __x, 
williamr@2:                       const reverse_iterator<_Iterator>& __y) {
williamr@2:   return !(__x < __y);
williamr@2: }
williamr@2: 
williamr@2: #endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
williamr@2: 
williamr@2: template <class _Iterator>
williamr@2: # ifdef __SUNPRO_CC
williamr@2: inline ptrdiff_t _STLP_CALL
williamr@2: # else
williamr@2: inline typename reverse_iterator<_Iterator>::difference_type _STLP_CALL
williamr@2: # endif
williamr@2: operator-(const reverse_iterator<_Iterator>& __x, 
williamr@2:           const reverse_iterator<_Iterator>& __y) {
williamr@2:   return __y.base() - __x.base();
williamr@2: }
williamr@2: 
williamr@2: template <class _Iterator, class _DifferenceType>
williamr@2: inline reverse_iterator<_Iterator>  _STLP_CALL
williamr@2: operator+(_DifferenceType n,const reverse_iterator<_Iterator>& x) {
williamr@2:   return x.operator+(n);
williamr@2: }
williamr@2: 
williamr@2: # endif
williamr@2: 
williamr@2: template <class _Container>
williamr@2: class back_insert_iterator 
williamr@2:   : public iterator<output_iterator_tag,void,void,void,void>
williamr@2: {
williamr@2: protected:
williamr@2:   _Container* container;
williamr@2: public:
williamr@2:   typedef _Container          container_type;
williamr@2:   typedef output_iterator_tag iterator_category;
williamr@2: 
williamr@2:   explicit back_insert_iterator(_Container& __x) : container(&__x) {}
williamr@2:   back_insert_iterator<_Container>&
williamr@2:   operator=(const typename _Container::value_type& __val) { 
williamr@2:     container->push_back(__val);
williamr@2:     return *this;
williamr@2:   }
williamr@2:   back_insert_iterator<_Container>& operator*() { return *this; }
williamr@2:   back_insert_iterator<_Container>& operator++() { return *this; }
williamr@2:   back_insert_iterator<_Container>  operator++(int) { return *this; }
williamr@2: };
williamr@2: 
williamr@2: template <class _Container>
williamr@2: inline back_insert_iterator<_Container>  _STLP_CALL back_inserter(_Container& __x) {
williamr@2:   return back_insert_iterator<_Container>(__x);
williamr@2: }
williamr@2: 
williamr@2: template <class _Container>
williamr@2: class front_insert_iterator 
williamr@2:   : public iterator<output_iterator_tag,void,void,void,void>
williamr@2: {
williamr@2: protected:
williamr@2:   _Container* container;
williamr@2: public:
williamr@2:   typedef _Container          container_type;
williamr@2:   typedef output_iterator_tag iterator_category;
williamr@2:   explicit front_insert_iterator(_Container& __x) : container(&__x) {}
williamr@2:   front_insert_iterator<_Container>&
williamr@2:   operator=(const typename _Container::value_type& __val) { 
williamr@2:     container->push_front(__val);
williamr@2:     return *this;
williamr@2:   }
williamr@2:   front_insert_iterator<_Container>& operator*() { return *this; }
williamr@2:   front_insert_iterator<_Container>& operator++() { return *this; }
williamr@2:   front_insert_iterator<_Container>& operator++(int) { return *this; }
williamr@2: };
williamr@2: 
williamr@2: template <class _Container>
williamr@2: inline front_insert_iterator<_Container>  _STLP_CALL front_inserter(_Container& __x) {
williamr@2:   return front_insert_iterator<_Container>(__x);
williamr@2: }
williamr@2: 
williamr@2: template <class _Container>
williamr@2: class insert_iterator 
williamr@2:   : public iterator<output_iterator_tag,void,void,void,void>
williamr@2: {
williamr@2: protected:
williamr@2:   _Container* container;
williamr@2:   typename _Container::iterator iter;
williamr@2: public:
williamr@2:   typedef _Container          container_type;
williamr@2:   typedef output_iterator_tag iterator_category;
williamr@2:   insert_iterator(_Container& __x, typename _Container::iterator __i) 
williamr@2:     : container(&__x), iter(__i) {}
williamr@2:   insert_iterator<_Container>&
williamr@2:   operator=(const typename _Container::value_type& __val) { 
williamr@2:     iter = container->insert(iter, __val);
williamr@2:     ++iter;
williamr@2:     return *this;
williamr@2:   }
williamr@2:   insert_iterator<_Container>& operator*() { return *this; }
williamr@2:   insert_iterator<_Container>& operator++() { return *this; }
williamr@2:   insert_iterator<_Container>& operator++(int) { return *this; }
williamr@2: };
williamr@2: 
williamr@2: template <class _Container, class _Iterator>
williamr@2: inline insert_iterator<_Container>  _STLP_CALL
williamr@2: inserter(_Container& __x, _Iterator __i)
williamr@2: {
williamr@2:   typedef typename _Container::iterator __iter;
williamr@2:   return insert_iterator<_Container>(__x, __iter(__i));
williamr@2: }
williamr@2: 
williamr@2: _STLP_END_NAMESPACE
williamr@2: 
williamr@2: #if ! defined ( _STLP_CLASS_PARTIAL_SPECIALIZATION ) || defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
williamr@2: # include <stl/_iterator_old.h>
williamr@2: #endif /* __NO_PARTIAL_SPEC || ANACHRONISMS */
williamr@2: 
williamr@2: #endif /* _STLP_INTERNAL_ITERATOR_H */
williamr@2: 
williamr@2: // Local Variables:
williamr@2: // mode:C++
williamr@2: // End: