# stl_iterator_base_types.h

Go to the documentation of this file.

    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 {
    00072
    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
    00102   template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
    00103            typename _Pointer = _Tp*, typename _Reference = _Tp&>
    00104     struct iterator
    00105     {
    00107       typedef _Category  iterator_category;
    00109       typedef _Tp        value_type;
    00111       typedef _Distance  difference_type;
    00113       typedef _Pointer   pointer;
    00115       typedef _Reference reference;
    00116     };
    00117
    00124   template<typename _Iterator>
    00125     struct iterator_traits {
    00126       typedef typename _Iterator::iterator_category iterator_category;
    00127       typedef typename _Iterator::value_type        value_type;
    00128       typedef typename _Iterator::difference_type   difference_type;
    00129       typedef typename _Iterator::pointer           pointer;
    00130       typedef typename _Iterator::reference         reference;
    00131     };
    00132
    00133   template<typename _Tp>
    00134     struct iterator_traits<_Tp*> {
    00135       typedef random_access_iterator_tag iterator_category;
    00136       typedef _Tp                         value_type;
    00137       typedef ptrdiff_t                   difference_type;
    00138       typedef _Tp*                        pointer;
    00139       typedef _Tp&                        reference;
    00140     };
    00141
    00142   template<typename _Tp>
    00143     struct iterator_traits<const _Tp*> {
    00144       typedef random_access_iterator_tag iterator_category;
    00145       typedef _Tp                         value_type;
    00146       typedef ptrdiff_t                   difference_type;
    00147       typedef const _Tp*                  pointer;
    00148       typedef const _Tp&                  reference;
    00149     };
    00150
    00157   template<typename _Iter>
    00158     inline typename iterator_traits<_Iter>::iterator_category
    00159     __iterator_category(const _Iter&)
    00160     { return typename iterator_traits<_Iter>::iterator_category(); }
    00161
    00162 } // namespace std
    00163
    00164 #endif /* __GLIBCPP_INTERNAL_ITERATOR_BASE_TYPES_H */
    00165