# 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