ext/iterator

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00001 // HP/SGI iterator extensions -*- C++ -*-
00002 
00003 // Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  *
00032  * Copyright (c) 1994
00033  * Hewlett-Packard Company
00034  *
00035  * Permission to use, copy, modify, distribute and sell this software
00036  * and its documentation for any purpose is hereby granted without fee,
00037  * provided that the above copyright notice appear in all copies and
00038  * that both that copyright notice and this permission notice appear
00039  * in supporting documentation.  Hewlett-Packard Company makes no
00040  * representations about the suitability of this software for any
00041  * purpose.  It is provided "as is" without express or implied warranty.
00042  *
00043  *
00044  * Copyright (c) 1996-1998
00045  * Silicon Graphics Computer Systems, Inc.
00046  *
00047  * Permission to use, copy, modify, distribute and sell this software
00048  * and its documentation for any purpose is hereby granted without fee,
00049  * provided that the above copyright notice appear in all copies and
00050  * that both that copyright notice and this permission notice appear
00051  * in supporting documentation.  Silicon Graphics makes no
00052  * representations about the suitability of this software for any
00053  * purpose.  It is provided "as is" without express or implied warranty.
00054  */
00055 
00056 /** @file ext/iterator
00057  *  This file is a GNU extension to the Standard C++ Library (possibly
00058  *  containing extensions from the HP/SGI STL subset).
00059  */
00060 
00061 #ifndef _EXT_ITERATOR
00062 #define _EXT_ITERATOR 1
00063 
00064 #pragma GCC system_header
00065 
00066 #include <bits/concept_check.h>
00067 #include <iterator>
00068 
00069 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00070 
00071   // There are two signatures for distance.  In addition to the one
00072   // taking two iterators and returning a result, there is another
00073   // taking two iterators and a reference-to-result variable, and
00074   // returning nothing.  The latter seems to be an SGI extension.
00075   // -- pedwards
00076   template<typename _InputIterator, typename _Distance>
00077     inline void
00078     __distance(_InputIterator __first, _InputIterator __last,
00079            _Distance& __n, std::input_iterator_tag)
00080     {
00081       // concept requirements
00082       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
00083       while (__first != __last)
00084     {
00085       ++__first;
00086       ++__n;
00087     }
00088     }
00089 
00090   template<typename _RandomAccessIterator, typename _Distance>
00091     inline void
00092     __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
00093            _Distance& __n, std::random_access_iterator_tag)
00094     {
00095       // concept requirements
00096       __glibcxx_function_requires(_RandomAccessIteratorConcept<
00097                   _RandomAccessIterator>)
00098       __n += __last - __first;
00099     }
00100 
00101   /**
00102    *  This is an SGI extension.
00103    *  @ingroup SGIextensions
00104    *  @doctodo
00105   */
00106   template<typename _InputIterator, typename _Distance>
00107     inline void
00108     distance(_InputIterator __first, _InputIterator __last,
00109              _Distance& __n)
00110     {
00111       // concept requirements -- taken care of in __distance
00112       __distance(__first, __last, __n, std::__iterator_category(__first));
00113     }
00114 
00115 _GLIBCXX_END_NAMESPACE
00116 
00117 #endif
00118 

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