mirror of git://gcc.gnu.org/git/gcc.git
266 lines
9.0 KiB
C++
266 lines
9.0 KiB
C++
/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/* NOTE: This is an internal header file, included by other STL headers.
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* You should not attempt to use it directly.
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*/
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#ifndef __SGI_STL_INTERNAL_ITERATOR_BASE_H
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#define __SGI_STL_INTERNAL_ITERATOR_BASE_H
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// This file contains all of the general iterator-related utilities.
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// The internal file stl_iterator.h contains predefined iterators,
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// such as front_insert_iterator and istream_iterator.
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#include <bits/concept_checks.h>
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namespace std
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{
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struct input_iterator_tag {};
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struct output_iterator_tag {};
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struct forward_iterator_tag : public input_iterator_tag {};
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struct bidirectional_iterator_tag : public forward_iterator_tag {};
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struct random_access_iterator_tag : public bidirectional_iterator_tag {};
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// The base classes input_iterator, output_iterator, forward_iterator,
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// bidirectional_iterator, and random_access_iterator are not part of
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// the C++ standard. (They have been replaced by struct iterator.)
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// They are included for backward compatibility with the HP STL.
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template <class _Tp, class _Distance> struct input_iterator {
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typedef input_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef _Distance difference_type;
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typedef _Tp* pointer;
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typedef _Tp& reference;
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};
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struct output_iterator {
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typedef output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void difference_type;
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typedef void pointer;
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typedef void reference;
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};
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template <class _Tp, class _Distance> struct forward_iterator {
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typedef forward_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef _Distance difference_type;
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typedef _Tp* pointer;
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typedef _Tp& reference;
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};
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template <class _Tp, class _Distance> struct bidirectional_iterator {
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typedef bidirectional_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef _Distance difference_type;
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typedef _Tp* pointer;
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typedef _Tp& reference;
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};
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template <class _Tp, class _Distance> struct random_access_iterator {
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typedef random_access_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef _Distance difference_type;
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typedef _Tp* pointer;
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typedef _Tp& reference;
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};
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template <class _Category, class _Tp, class _Distance = ptrdiff_t,
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class _Pointer = _Tp*, class _Reference = _Tp&>
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struct iterator {
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typedef _Category iterator_category;
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typedef _Tp value_type;
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typedef _Distance difference_type;
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typedef _Pointer pointer;
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typedef _Reference reference;
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};
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template <class _Iterator>
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struct iterator_traits {
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typedef typename _Iterator::iterator_category iterator_category;
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typedef typename _Iterator::value_type value_type;
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typedef typename _Iterator::difference_type difference_type;
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typedef typename _Iterator::pointer pointer;
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typedef typename _Iterator::reference reference;
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};
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template <class _Tp>
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struct iterator_traits<_Tp*> {
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typedef random_access_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef ptrdiff_t difference_type;
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typedef _Tp* pointer;
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typedef _Tp& reference;
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};
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template <class _Tp>
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struct iterator_traits<const _Tp*> {
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typedef random_access_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef ptrdiff_t difference_type;
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typedef const _Tp* pointer;
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typedef const _Tp& reference;
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};
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// The overloaded functions iterator_category, distance_type, and
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// value_type are not part of the C++ standard. (They have been
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// replaced by struct iterator_traits.) They are included for
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// backward compatibility with the HP STL.
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// We introduce internal names for these functions.
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template <class _Iter>
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inline typename iterator_traits<_Iter>::iterator_category
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__iterator_category(const _Iter&)
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{
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typedef typename iterator_traits<_Iter>::iterator_category _Category;
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return _Category();
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}
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template <class _Iter>
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inline typename iterator_traits<_Iter>::difference_type*
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__distance_type(const _Iter&)
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{
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return static_cast<typename iterator_traits<_Iter>::difference_type*>(0);
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}
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template <class _Iter>
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inline typename iterator_traits<_Iter>::value_type*
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__value_type(const _Iter&)
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{
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return static_cast<typename iterator_traits<_Iter>::value_type*>(0);
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}
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template <class _Iter>
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inline typename iterator_traits<_Iter>::iterator_category
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iterator_category(const _Iter& __i) { return __iterator_category(__i); }
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template <class _Iter>
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inline typename iterator_traits<_Iter>::difference_type*
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distance_type(const _Iter& __i) { return __distance_type(__i); }
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template <class _Iter>
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inline typename iterator_traits<_Iter>::value_type*
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value_type(const _Iter& __i) { return __value_type(__i); }
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#define __ITERATOR_CATEGORY(__i) __iterator_category(__i)
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#define __DISTANCE_TYPE(__i) __distance_type(__i)
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#define __VALUE_TYPE(__i) __value_type(__i)
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template <class _InputIterator, class _Distance>
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inline void __distance(_InputIterator __first, _InputIterator __last,
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_Distance& __n, input_iterator_tag)
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{
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while (__first != __last) { ++__first; ++__n; }
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}
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template <class _RandomAccessIterator, class _Distance>
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inline void __distance(_RandomAccessIterator __first,
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_RandomAccessIterator __last,
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_Distance& __n, random_access_iterator_tag)
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{
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__STL_REQUIRES(_RandomAccessIterator, _RandomAccessIterator);
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__n += __last - __first;
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}
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template <class _InputIterator, class _Distance>
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inline void distance(_InputIterator __first,
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_InputIterator __last, _Distance& __n)
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{
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__STL_REQUIRES(_InputIterator, _InputIterator);
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__distance(__first, __last, __n, iterator_category(__first));
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}
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template <class _InputIterator>
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inline typename iterator_traits<_InputIterator>::difference_type
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__distance(_InputIterator __first, _InputIterator __last, input_iterator_tag)
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{
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typename iterator_traits<_InputIterator>::difference_type __n = 0;
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while (__first != __last) {
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++__first; ++__n;
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}
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return __n;
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}
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template <class _RandomAccessIterator>
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inline typename iterator_traits<_RandomAccessIterator>::difference_type
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__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
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random_access_iterator_tag) {
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__STL_REQUIRES(_RandomAccessIterator, _RandomAccessIterator);
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return __last - __first;
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}
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template <class _InputIterator>
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inline typename iterator_traits<_InputIterator>::difference_type
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distance(_InputIterator __first, _InputIterator __last) {
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typedef typename iterator_traits<_InputIterator>::iterator_category
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_Category;
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__STL_REQUIRES(_InputIterator, _InputIterator);
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return __distance(__first, __last, _Category());
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}
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template <class _InputIter, class _Distance>
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inline void __advance(_InputIter& __i, _Distance __n, input_iterator_tag) {
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while (__n--) ++__i;
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}
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template <class _BidirectionalIterator, class _Distance>
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inline void __advance(_BidirectionalIterator& __i, _Distance __n,
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bidirectional_iterator_tag) {
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__STL_REQUIRES(_BidirectionalIterator, _BidirectionalIterator);
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if (__n >= 0)
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while (__n--) ++__i;
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else
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while (__n++) --__i;
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}
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template <class _RandomAccessIterator, class _Distance>
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inline void __advance(_RandomAccessIterator& __i, _Distance __n,
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random_access_iterator_tag) {
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__STL_REQUIRES(_RandomAccessIterator, _RandomAccessIterator);
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__i += __n;
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}
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template <class _InputIterator, class _Distance>
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inline void advance(_InputIterator& __i, _Distance __n) {
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__STL_REQUIRES(_InputIterator, _InputIterator);
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__advance(__i, __n, iterator_category(__i));
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}
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} // namespace std
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#endif /* __SGI_STL_INTERNAL_ITERATOR_BASE_H */
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// Local Variables:
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// mode:C++
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// End:
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