stl_iterator_base_types.h

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00001 // Types used in iterator implementation -*- C++ -*-
00002 
00003 // Copyright (C) 2001, 2002 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  *
00032  * Copyright (c) 1994
00033  * Hewlett-Packard Company
00034  *
00035  * Permission to use, copy, modify, distribute and sell this software
00036  * and its documentation for any purpose is hereby granted without fee,
00037  * provided that the above copyright notice appear in all copies and
00038  * that both that copyright notice and this permission notice appear
00039  * in supporting documentation.  Hewlett-Packard Company makes no
00040  * representations about the suitability of this software for any
00041  * purpose.  It is provided "as is" without express or implied warranty.
00042  *
00043  *
00044  * Copyright (c) 1996-1998
00045  * Silicon Graphics Computer Systems, Inc.
00046  *
00047  * Permission to use, copy, modify, distribute and sell this software
00048  * and its documentation for any purpose is hereby granted without fee,
00049  * provided that the above copyright notice appear in all copies and
00050  * that both that copyright notice and this permission notice appear
00051  * in supporting documentation.  Silicon Graphics makes no
00052  * representations about the suitability of this software for any
00053  * purpose.  It is provided "as is" without express or implied warranty.
00054  */
00055 
00064 #ifndef __GLIBCPP_INTERNAL_ITERATOR_BASE_TYPES_H
00065 #define __GLIBCPP_INTERNAL_ITERATOR_BASE_TYPES_H
00066 
00067 #pragma GCC system_header
00068 
00069 namespace std
00070 {
00079 
00080   struct input_iterator_tag {};
00082   struct output_iterator_tag {};
00084   struct forward_iterator_tag : public input_iterator_tag {};
00086   struct bidirectional_iterator_tag : public forward_iterator_tag {};
00088   struct random_access_iterator_tag : public bidirectional_iterator_tag {};
00090 
00091 
00100   template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
00101        typename _Pointer = _Tp*, typename _Reference = _Tp&>
00102     struct iterator {
00104       typedef _Category  iterator_category;
00106       typedef _Tp        value_type;
00108       typedef _Distance  difference_type;
00110       typedef _Pointer   pointer;
00112       typedef _Reference reference;
00113     };
00114 
00121   template<typename _Iterator>
00122     struct iterator_traits {
00123       typedef typename _Iterator::iterator_category iterator_category;
00124       typedef typename _Iterator::value_type        value_type;
00125       typedef typename _Iterator::difference_type   difference_type;
00126       typedef typename _Iterator::pointer           pointer;
00127       typedef typename _Iterator::reference         reference;
00128     };
00129 
00130   template<typename _Tp>
00131     struct iterator_traits<_Tp*> {
00132       typedef random_access_iterator_tag iterator_category;
00133       typedef _Tp                         value_type;
00134       typedef ptrdiff_t                   difference_type;
00135       typedef _Tp*                        pointer;
00136       typedef _Tp&                        reference;
00137     };
00138 
00139   template<typename _Tp>
00140     struct iterator_traits<const _Tp*> {
00141       typedef random_access_iterator_tag iterator_category;
00142       typedef _Tp                         value_type;
00143       typedef ptrdiff_t                   difference_type;
00144       typedef const _Tp*                  pointer;
00145       typedef const _Tp&                  reference;
00146     };
00147 
00154   template<typename _Iter>
00155     inline typename iterator_traits<_Iter>::iterator_category
00156     __iterator_category(const _Iter&)
00157     { return typename iterator_traits<_Iter>::iterator_category(); }
00158 
00159 } // namespace std
00160 
00161 #endif /* __GLIBCPP_INTERNAL_ITERATOR_BASE_TYPES_H */
00162 

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