// HP/SGI iterator extensions -*- C++ -*-// Copyright (C) 2001, 2002, 2004, 2005, 2009 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 3, 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.// Under Section 7 of GPL version 3, you are granted additional// permissions described in the GCC Runtime Library Exception, version// 3.1, as published by the Free Software Foundation.// You should have received a copy of the GNU General Public License and// a copy of the GCC Runtime Library Exception along with this program;// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see// <http://www.gnu.org/licenses/>./*** 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.*//** @file ext/iterator* This file is a GNU extension to the Standard C++ Library (possibly* containing extensions from the HP/SGI STL subset).*/#ifndef _EXT_ITERATOR#define _EXT_ITERATOR 1#pragma GCC system_header#include <bits/concept_check.h>#include <iterator>_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)// There are two signatures for distance. In addition to the one// taking two iterators and returning a result, there is another// taking two iterators and a reference-to-result variable, and// returning nothing. The latter seems to be an SGI extension.// -- pedwardstemplate<typename _InputIterator, typename _Distance>inline void__distance(_InputIterator __first, _InputIterator __last,_Distance& __n, std::input_iterator_tag){// concept requirements__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)while (__first != __last){++__first;++__n;}}template<typename _RandomAccessIterator, typename _Distance>inline void__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,_Distance& __n, std::random_access_iterator_tag){// concept requirements__glibcxx_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)__n += __last - __first;}/*** This is an SGI extension.* @ingroup SGIextensions* @doctodo*/template<typename _InputIterator, typename _Distance>inline voiddistance(_InputIterator __first, _InputIterator __last,_Distance& __n){// concept requirements -- taken care of in __distance__distance(__first, __last, __n, std::__iterator_category(__first));}_GLIBCXX_END_NAMESPACE#endif