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Whole document tree                   stl_iterator_base_types.h Go to the documentation of this file. // Types used in iterator implementation -*- C++ -*- // Copyright (C) 2001 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996-1998 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /* NOTE: This is an internal header file, included by other STL headers. * You should not attempt to use it directly. */ #ifndef __SGI_STL_INTERNAL_ITERATOR_BASE_TYPES_H #define __SGI_STL_INTERNAL_ITERATOR_BASE_TYPES_H // This file contains all of the general iterator-related utility // types, such as iterator_traits and struct iterator. // The internal file stl_iterator.h contains predefined iterators, // such as front_insert_iterator and istream_iterator. #pragma GCC system_header #include <bits/std_cstddef.h> // for ptrdiff_t namespace std { struct input_iterator_tag {}; struct output_iterator_tag {}; struct forward_iterator_tag : public input_iterator_tag {}; struct bidirectional_iterator_tag : public forward_iterator_tag {}; struct random_access_iterator_tag : public bidirectional_iterator_tag {}; // The base classes input_iterator, output_iterator, forward_iterator, // bidirectional_iterator, and random_access_iterator are not part of // the C++ standard. (They have been replaced by struct iterator.) // They are included for backward compatibility with the HP STL. template <class _Tp, class _Distance> struct input_iterator { typedef input_iterator_tag iterator_category; typedef _Tp value_type; typedef _Distance difference_type; typedef _Tp* pointer; typedef _Tp& reference; }; struct output_iterator { typedef output_iterator_tag iterator_category; typedef void value_type; typedef void difference_type; typedef void pointer; typedef void reference; }; template <class _Tp, class _Distance> struct forward_iterator { typedef forward_iterator_tag iterator_category; typedef _Tp value_type; typedef _Distance difference_type; typedef _Tp* pointer; typedef _Tp& reference; }; template <class _Tp, class _Distance> struct bidirectional_iterator { typedef bidirectional_iterator_tag iterator_category; typedef _Tp value_type; typedef _Distance difference_type; typedef _Tp* pointer; typedef _Tp& reference; }; template <class _Tp, class _Distance> struct random_access_iterator { typedef random_access_iterator_tag iterator_category; typedef _Tp value_type; typedef _Distance difference_type; typedef _Tp* pointer; typedef _Tp& reference; }; template <class _Category, class _Tp, class _Distance = ptrdiff_t, class _Pointer = _Tp*, class _Reference = _Tp&> struct iterator { typedef _Category iterator_category; typedef _Tp value_type; typedef _Distance difference_type; typedef _Pointer pointer; typedef _Reference reference; }; template <class _Iterator> struct iterator_traits { typedef typename _Iterator::iterator_category iterator_category; typedef typename _Iterator::value_type value_type; typedef typename _Iterator::difference_type difference_type; typedef typename _Iterator::pointer pointer; typedef typename _Iterator::reference reference; }; template <class _Tp> struct iterator_traits<_Tp*> { typedef random_access_iterator_tag iterator_category; typedef _Tp value_type; typedef ptrdiff_t difference_type; typedef _Tp* pointer; typedef _Tp& reference; }; template <class _Tp> struct iterator_traits<const _Tp*> { typedef random_access_iterator_tag iterator_category; typedef _Tp value_type; typedef ptrdiff_t difference_type; typedef const _Tp* pointer; typedef const _Tp& reference; }; // The overloaded functions iterator_category, distance_type, and // value_type are not part of the C++ standard. (They have been // replaced by struct iterator_traits.) They are included for // backward compatibility with the HP STL. // We introduce internal names for these functions. template <class _Iter> inline typename iterator_traits<_Iter>::iterator_category __iterator_category(const _Iter&) { typedef typename iterator_traits<_Iter>::iterator_category _Category; return _Category(); } template <class _Iter> inline typename iterator_traits<_Iter>::difference_type* __distance_type(const _Iter&) { return static_cast<typename iterator_traits<_Iter>::difference_type*>(0); } template <class _Iter> inline typename iterator_traits<_Iter>::value_type* __value_type(const _Iter&) { return static_cast<typename iterator_traits<_Iter>::value_type*>(0); } template <class _Iter> inline typename iterator_traits<_Iter>::iterator_category iterator_category(const _Iter& __i) { return __iterator_category(__i); } template <class _Iter> inline typename iterator_traits<_Iter>::difference_type* distance_type(const _Iter& __i) { return __distance_type(__i); } template <class _Iter> inline typename iterator_traits<_Iter>::value_type* value_type(const _Iter& __i) { return __value_type(__i); } } // namespace std #endif /* __SGI_STL_INTERNAL_ITERATOR_BASE_TYPES_H */ // Local Variables: // mode:C++ // End: