117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
// HP/SGI iterator extensions -*- C++ -*-
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// Copyright (C) 2001-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file ext/iterator
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* This file is a GNU extension to the Standard C++ Library (possibly
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* containing extensions from the HP/SGI STL subset).
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*/
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#ifndef _EXT_ITERATOR
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#define _EXT_ITERATOR 1
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#pragma GCC system_header
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#include <bits/concept_check.h>
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#include <iterator>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// There are two signatures for distance. In addition to the one
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// taking two iterators and returning a result, there is another
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// taking two iterators and a reference-to-result variable, and
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// returning nothing. The latter seems to be an SGI extension.
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// -- pedwards
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template<typename _InputIterator, typename _Distance>
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inline void
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__distance(_InputIterator __first, _InputIterator __last,
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_Distance& __n, std::input_iterator_tag)
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{
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// concept requirements
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__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
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while (__first != __last)
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{
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++__first;
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++__n;
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}
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}
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template<typename _RandomAccessIterator, typename _Distance>
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inline void
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__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
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_Distance& __n, std::random_access_iterator_tag)
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{
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// concept requirements
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__glibcxx_function_requires(_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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__n += __last - __first;
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}
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/**
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* This is an SGI extension.
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* @ingroup SGIextensions
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* @doctodo
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*/
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template<typename _InputIterator, typename _Distance>
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inline void
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distance(_InputIterator __first, _InputIterator __last,
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_Distance& __n)
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{
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// concept requirements -- taken care of in __distance
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__distance(__first, __last, __n, std::__iterator_category(__first));
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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