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// HP/SGI iterator extensions -*- C++ -*- |
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|
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// Copyright (C) 2001-2021 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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|
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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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|
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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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|
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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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* |
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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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|
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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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|
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#ifndef _EXT_ITERATOR |
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#define _EXT_ITERATOR 1 |
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|
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#pragma GCC system_header |
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|
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#include <bits/concept_check.h> |
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#include <iterator> |
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|
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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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|
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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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|
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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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/** |
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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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|
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace |
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|
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#endif |
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