iterator revision 132720
1// HP/SGI iterator extensions -*- C++ -*- 2 3// Copyright (C) 2001, 2002 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 2, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 19// USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30/* 31 * 32 * Copyright (c) 1994 33 * Hewlett-Packard Company 34 * 35 * Permission to use, copy, modify, distribute and sell this software 36 * and its documentation for any purpose is hereby granted without fee, 37 * provided that the above copyright notice appear in all copies and 38 * that both that copyright notice and this permission notice appear 39 * in supporting documentation. Hewlett-Packard Company makes no 40 * representations about the suitability of this software for any 41 * purpose. It is provided "as is" without express or implied warranty. 42 * 43 * 44 * Copyright (c) 1996-1998 45 * Silicon Graphics Computer Systems, Inc. 46 * 47 * Permission to use, copy, modify, distribute and sell this software 48 * and its documentation for any purpose is hereby granted without fee, 49 * provided that the above copyright notice appear in all copies and 50 * that both that copyright notice and this permission notice appear 51 * in supporting documentation. Silicon Graphics makes no 52 * representations about the suitability of this software for any 53 * purpose. It is provided "as is" without express or implied warranty. 54 */ 55 56/** @file ext/iterator 57 * This file is a GNU extension to the Standard C++ Library (possibly 58 * containing extensions from the HP/SGI STL subset). You should only 59 * include this header if you are using GCC 3 or later. 60 */ 61 62#ifndef _EXT_ITERATOR 63#define _EXT_ITERATOR 1 64 65#pragma GCC system_header 66 67#include <bits/concept_check.h> 68#include <iterator> 69 70namespace __gnu_cxx 71{ 72 // There are two signatures for distance. In addition to the one 73 // taking two iterators and returning a result, there is another 74 // taking two iterators and a reference-to-result variable, and 75 // returning nothing. The latter seems to be an SGI extension. 76 // -- pedwards 77 template<typename _InputIterator, typename _Distance> 78 inline void 79 __distance(_InputIterator __first, _InputIterator __last, 80 _Distance& __n, std::input_iterator_tag) 81 { 82 // concept requirements 83 __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) 84 while (__first != __last) { ++__first; ++__n; } 85 } 86 87 template<typename _RandomAccessIterator, typename _Distance> 88 inline void 89 __distance(_RandomAccessIterator __first, _RandomAccessIterator __last, 90 _Distance& __n, std::random_access_iterator_tag) 91 { 92 // concept requirements 93 __glibcxx_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>) 94 __n += __last - __first; 95 } 96 97 /** 98 * This is an SGI extension. 99 * @ingroup SGIextensions 100 * @doctodo 101 */ 102 template<typename _InputIterator, typename _Distance> 103 inline void 104 distance(_InputIterator __first, _InputIterator __last, 105 _Distance& __n) 106 { 107 // concept requirements -- taken care of in __distance 108 __distance(__first, __last, __n, std::__iterator_category(__first)); 109 } 110} // namespace __gnu_cxx 111 112#endif 113 114