iterator revision 169691
197403Sobrien// HP/SGI iterator extensions -*- C++ -*- 297403Sobrien 3169691Skan// Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc. 497403Sobrien// 597403Sobrien// This file is part of the GNU ISO C++ Library. This library is free 697403Sobrien// software; you can redistribute it and/or modify it under the 797403Sobrien// terms of the GNU General Public License as published by the 897403Sobrien// Free Software Foundation; either version 2, or (at your option) 997403Sobrien// any later version. 1097403Sobrien 1197403Sobrien// This library is distributed in the hope that it will be useful, 1297403Sobrien// but WITHOUT ANY WARRANTY; without even the implied warranty of 1397403Sobrien// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1497403Sobrien// GNU General Public License for more details. 1597403Sobrien 1697403Sobrien// You should have received a copy of the GNU General Public License along 1797403Sobrien// with this library; see the file COPYING. If not, write to the Free 18169691Skan// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 1997403Sobrien// USA. 2097403Sobrien 2197403Sobrien// As a special exception, you may use this file as part of a free software 2297403Sobrien// library without restriction. Specifically, if other files instantiate 2397403Sobrien// templates or use macros or inline functions from this file, or you compile 2497403Sobrien// this file and link it with other files to produce an executable, this 2597403Sobrien// file does not by itself cause the resulting executable to be covered by 2697403Sobrien// the GNU General Public License. This exception does not however 2797403Sobrien// invalidate any other reasons why the executable file might be covered by 2897403Sobrien// the GNU General Public License. 2997403Sobrien 3097403Sobrien/* 3197403Sobrien * 3297403Sobrien * Copyright (c) 1994 3397403Sobrien * Hewlett-Packard Company 3497403Sobrien * 3597403Sobrien * Permission to use, copy, modify, distribute and sell this software 3697403Sobrien * and its documentation for any purpose is hereby granted without fee, 3797403Sobrien * provided that the above copyright notice appear in all copies and 3897403Sobrien * that both that copyright notice and this permission notice appear 3997403Sobrien * in supporting documentation. Hewlett-Packard Company makes no 4097403Sobrien * representations about the suitability of this software for any 4197403Sobrien * purpose. It is provided "as is" without express or implied warranty. 4297403Sobrien * 4397403Sobrien * 4497403Sobrien * Copyright (c) 1996-1998 4597403Sobrien * Silicon Graphics Computer Systems, Inc. 4697403Sobrien * 4797403Sobrien * Permission to use, copy, modify, distribute and sell this software 4897403Sobrien * and its documentation for any purpose is hereby granted without fee, 4997403Sobrien * provided that the above copyright notice appear in all copies and 5097403Sobrien * that both that copyright notice and this permission notice appear 5197403Sobrien * in supporting documentation. Silicon Graphics makes no 5297403Sobrien * representations about the suitability of this software for any 5397403Sobrien * purpose. It is provided "as is" without express or implied warranty. 5497403Sobrien */ 5597403Sobrien 5697403Sobrien/** @file ext/iterator 5797403Sobrien * This file is a GNU extension to the Standard C++ Library (possibly 58169691Skan * containing extensions from the HP/SGI STL subset). 5997403Sobrien */ 6097403Sobrien 6197403Sobrien#ifndef _EXT_ITERATOR 62132720Skan#define _EXT_ITERATOR 1 6397403Sobrien 6497403Sobrien#pragma GCC system_header 65132720Skan 6697403Sobrien#include <bits/concept_check.h> 6797403Sobrien#include <iterator> 6897403Sobrien 69169691Skan_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 70169691Skan 71132720Skan // There are two signatures for distance. In addition to the one 72132720Skan // taking two iterators and returning a result, there is another 73132720Skan // taking two iterators and a reference-to-result variable, and 74132720Skan // returning nothing. The latter seems to be an SGI extension. 75132720Skan // -- pedwards 7697403Sobrien template<typename _InputIterator, typename _Distance> 7797403Sobrien inline void 7897403Sobrien __distance(_InputIterator __first, _InputIterator __last, 7997403Sobrien _Distance& __n, std::input_iterator_tag) 8097403Sobrien { 8197403Sobrien // concept requirements 82132720Skan __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) 83169691Skan while (__first != __last) 84169691Skan { 85169691Skan ++__first; 86169691Skan ++__n; 87169691Skan } 8897403Sobrien } 8997403Sobrien 9097403Sobrien template<typename _RandomAccessIterator, typename _Distance> 9197403Sobrien inline void 92132720Skan __distance(_RandomAccessIterator __first, _RandomAccessIterator __last, 9397403Sobrien _Distance& __n, std::random_access_iterator_tag) 9497403Sobrien { 9597403Sobrien // concept requirements 96169691Skan __glibcxx_function_requires(_RandomAccessIteratorConcept< 97169691Skan _RandomAccessIterator>) 9897403Sobrien __n += __last - __first; 9997403Sobrien } 10097403Sobrien 101102782Skan /** 102102782Skan * This is an SGI extension. 103102782Skan * @ingroup SGIextensions 104102782Skan * @doctodo 105102782Skan */ 10697403Sobrien template<typename _InputIterator, typename _Distance> 10797403Sobrien inline void 10897403Sobrien distance(_InputIterator __first, _InputIterator __last, 10997403Sobrien _Distance& __n) 11097403Sobrien { 11197403Sobrien // concept requirements -- taken care of in __distance 11297403Sobrien __distance(__first, __last, __n, std::__iterator_category(__first)); 11397403Sobrien } 11497403Sobrien 115169691Skan_GLIBCXX_END_NAMESPACE 116169691Skan 117132720Skan#endif 11897403Sobrien 119