# ext/iterator

Go to the documentation of this file.

    00001 // HP/SGI iterator extensions -*- C++ -*-
    00002
    00003 // Copyright (C) 2001, 2002, 2004, 2005, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
    00017 // permissions described in the GCC Runtime Library Exception, version
    00018 // 3.1, as published by the Free Software Foundation.
    00019
    00020 // You should have received a copy of the GNU General Public License and
    00021 // a copy of the GCC Runtime Library Exception along with this program;
    00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    00023 // <http://www.gnu.org/licenses/>.
    00024
    00025 /*
    00026  *
    00027  * Copyright (c) 1994
    00028  * Hewlett-Packard Company
    00029  *
    00030  * Permission to use, copy, modify, distribute and sell this software
    00031  * and its documentation for any purpose is hereby granted without fee,
    00032  * provided that the above copyright notice appear in all copies and
    00033  * that both that copyright notice and this permission notice appear
    00034  * in supporting documentation.  Hewlett-Packard Company makes no
    00035  * representations about the suitability of this software for any
    00036  * purpose.  It is provided "as is" without express or implied warranty.
    00037  *
    00038  *
    00039  * Copyright (c) 1996-1998
    00040  * Silicon Graphics Computer Systems, Inc.
    00041  *
    00042  * Permission to use, copy, modify, distribute and sell this software
    00043  * and its documentation for any purpose is hereby granted without fee,
    00044  * provided that the above copyright notice appear in all copies and
    00045  * that both that copyright notice and this permission notice appear
    00046  * in supporting documentation.  Silicon Graphics makes no
    00047  * representations about the suitability of this software for any
    00048  * purpose.  It is provided "as is" without express or implied warranty.
    00049  */
    00050
    00051 /** @file ext/iterator
    00052  *  This file is a GNU extension to the Standard C++ Library (possibly
    00053  *  containing extensions from the HP/SGI STL subset).
    00054  */
    00055
    00056 #ifndef _EXT_ITERATOR
    00057 #define _EXT_ITERATOR 1
    00058
    00059 #pragma GCC system_header
    00060
    00061 #include <bits/concept_check.h>
    00062 #include <iterator>
    00063
    00064 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
    00065
    00066   // There are two signatures for distance.  In addition to the one
    00067   // taking two iterators and returning a result, there is another
    00068   // taking two iterators and a reference-to-result variable, and
    00069   // returning nothing.  The latter seems to be an SGI extension.
    00070   // -- pedwards
    00071   template<typename _InputIterator, typename _Distance>
    00072     inline void
    00073     __distance(_InputIterator __first, _InputIterator __last,
    00074            _Distance& __n, std::input_iterator_tag)
    00075     {
    00076       // concept requirements
    00077       __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
    00078       while (__first != __last)
    00079     {
    00080       ++__first;
    00081       ++__n;
    00082     }
    00083     }
    00084
    00085   template<typename _RandomAccessIterator, typename _Distance>
    00086     inline void
    00087     __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
    00088            _Distance& __n, std::random_access_iterator_tag)
    00089     {
    00090       // concept requirements
    00091       __glibcxx_function_requires(_RandomAccessIteratorConcept<
    00092                   _RandomAccessIterator>)
    00093       __n += __last - __first;
    00094     }
    00095
    00096   /**
    00097    *  This is an SGI extension.
    00098    *  @ingroup SGIextensions
    00099    *  @doctodo
    00100   */
    00101   template<typename _InputIterator, typename _Distance>
    00102     inline void
    00103     distance(_InputIterator __first, _InputIterator __last,
    00104              _Distance& __n)
    00105     {
    00106       // concept requirements -- taken care of in __distance
    00107       __distance(__first, __last, __n, std::__iterator_category(__first));
    00108     }
    00109
    00110 _GLIBCXX_END_NAMESPACE
    00111
    00112 #endif
    00113