00001 // HP/SGI iterator extensions -*- C++ -*- 00002 00003 // Copyright (C) 2001, 2002, 2004 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 00061 #ifndef _EXT_ITERATOR 00062 #define _EXT_ITERATOR 1 00063 00064 #pragma GCC system_header 00065 00066 #include <bits/concept_check.h> 00067 #include <iterator> 00068 00069 namespace __gnu_cxx 00070 { 00071 // There are two signatures for distance. In addition to the one 00072 // taking two iterators and returning a result, there is another 00073 // taking two iterators and a reference-to-result variable, and 00074 // returning nothing. The latter seems to be an SGI extension. 00075 // -- pedwards 00076 template<typename _InputIterator, typename _Distance> 00077 inline void 00078 __distance(_InputIterator __first, _InputIterator __last, 00079 _Distance& __n, std::input_iterator_tag) 00080 { 00081 // concept requirements 00082 __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) 00083 while (__first != __last) 00084 { 00085 ++__first; 00086 ++__n; 00087 } 00088 } 00089 00090 template<typename _RandomAccessIterator, typename _Distance> 00091 inline void 00092 __distance(_RandomAccessIterator __first, _RandomAccessIterator __last, 00093 _Distance& __n, std::random_access_iterator_tag) 00094 { 00095 // concept requirements 00096 __glibcxx_function_requires(_RandomAccessIteratorConcept< 00097 _RandomAccessIterator>) 00098 __n += __last - __first; 00099 } 00100 00106 template<typename _InputIterator, typename _Distance> 00107 inline void 00108 distance(_InputIterator __first, _InputIterator __last, 00109 _Distance& __n) 00110 { 00111 // concept requirements -- taken care of in __distance 00112 __distance(__first, __last, __n, std::__iterator_category(__first)); 00113 } 00114 } // namespace __gnu_cxx 00115 00116 #endif 00117