# iterator

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    00001 // HP/SGI iterator extensions -*- C++ -*-
    00002
    00003 // Copyright (C) 2001, 2002 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
    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).  You should only
    00059  *  include this header if you are using GCC 3 or later.
    00060  */
    00061
    00062 #ifndef _EXT_ITERATOR
    00063 #define _EXT_ITERATOR 1
    00064
    00065 #pragma GCC system_header
    00066
    00067 #include <bits/concept_check.h>
    00068 #include <iterator>
    00069
    00070 namespace __gnu_cxx
    00071 {
    00072   // There are two signatures for distance.  In addition to the one
    00073   // taking two iterators and returning a result, there is another
    00074   // taking two iterators and a reference-to-result variable, and
    00075   // returning nothing.  The latter seems to be an SGI extension.
    00076   // -- pedwards
    00077   template<typename _InputIterator, typename _Distance>
    00078     inline void
    00079     __distance(_InputIterator __first, _InputIterator __last,
    00080            _Distance& __n, std::input_iterator_tag)
    00081     {
    00082       // concept requirements
    00083       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
    00084       while (__first != __last) { ++__first; ++__n; }
    00085     }
    00086
    00087   template<typename _RandomAccessIterator, typename _Distance>
    00088     inline void
    00089     __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
    00090            _Distance& __n, std::random_access_iterator_tag)
    00091     {
    00092       // concept requirements
    00093       __glibcxx_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
    00094       __n += __last - __first;
    00095     }
    00096
    00097   /**
    00098    *  This is an SGI extension.
    00099    *  @ingroup SGIextensions
    00100    *  @doctodo
    00101   */
    00102   template<typename _InputIterator, typename _Distance>
    00103     inline void
    00104     distance(_InputIterator __first, _InputIterator __last,
    00105              _Distance& __n)
    00106     {
    00107       // concept requirements -- taken care of in __distance
    00108       __distance(__first, __last, __n, std::__iterator_category(__first));
    00109     }
    00110 } // namespace __gnu_cxx
    00111
    00112 #endif
    00113