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- // HP/SGI iterator extensions -*- C++ -*-
-
- // Copyright (C) 2001, 2002 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 2, 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.
-
- // You should have received a copy of the GNU General Public License along
- // with this library; see the file COPYING. If not, write to the Free
- // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- // USA.
-
- // As a special exception, you may use this file as part of a free software
- // library without restriction. Specifically, if other files instantiate
- // templates or use macros or inline functions from this file, or you compile
- // this file and link it with other files to produce an executable, this
- // file does not by itself cause the resulting executable to be covered by
- // the GNU General Public License. This exception does not however
- // invalidate any other reasons why the executable file might be covered by
- // the GNU General Public License.
-
- /*
- *
- * 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). You should only
- * include this header if you are using GCC 3 or later.
- */
-
- #ifndef _EXT_ITERATOR
- #define _EXT_ITERATOR
-
- #pragma GCC system_header
- #include <bits/concept_check.h>
- #include <iterator>
-
- 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. -- pedwards
- template<typename _InputIterator, typename _Distance>
- inline void
- __distance(_InputIterator __first, _InputIterator __last,
- _Distance& __n, std::input_iterator_tag)
- {
- // concept requirements
- __glibcpp_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
- __glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
- __n += __last - __first;
- }
-
- /**
- * This is an SGI extension.
- * @ingroup SGIextensions
- * @doctodo
- */
- template<typename _InputIterator, typename _Distance>
- inline void
- distance(_InputIterator __first, _InputIterator __last,
- _Distance& __n)
- {
- // concept requirements -- taken care of in __distance
- __distance(__first, __last, __n, std::__iterator_category(__first));
- }
-
- } // namespace __gnu_cxx
-
- #endif /* _EXT_ITERATOR */
-
-