stl_iterator_base_funcs.h

Go to the documentation of this file.
00001 // Functions used by iterators -*- 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 
00064 #ifndef __GLIBCPP_INTERNAL_ITERATOR_BASE_FUNCS_H
00065 #define __GLIBCPP_INTERNAL_ITERATOR_BASE_FUNCS_H
00066 
00067 #pragma GCC system_header
00068 #include <bits/concept_check.h>
00069 
00070 // Since this entire file is within namespace std, there's no reason to
00071 // waste two spaces along the left column.  Thus the leading indentation is
00072 // slightly violated from here on.
00073 namespace std
00074 {
00075 template<typename _InputIterator>
00076   inline typename iterator_traits<_InputIterator>::difference_type
00077   __distance(_InputIterator __first, _InputIterator __last, input_iterator_tag)
00078   {
00079     // concept requirements
00080     __glibcpp_function_requires(_InputIteratorConcept<_InputIterator>)
00081 
00082     typename iterator_traits<_InputIterator>::difference_type __n = 0;
00083     while (__first != __last) {
00084       ++__first; ++__n;
00085     }
00086     return __n;
00087   }
00088 
00089 template<typename _RandomAccessIterator>
00090   inline typename iterator_traits<_RandomAccessIterator>::difference_type
00091   __distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
00092              random_access_iterator_tag)
00093   {
00094     // concept requirements
00095     __glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
00096     return __last - __first;
00097   }
00098 
00111 template<typename _InputIterator>
00112   inline typename iterator_traits<_InputIterator>::difference_type
00113   distance(_InputIterator __first, _InputIterator __last)
00114   {
00115     // concept requirements -- taken care of in __distance
00116     return __distance(__first, __last, __iterator_category(__first));
00117   }
00118 
00119 template<typename _InputIter, typename _Distance>
00120   inline void
00121   __advance(_InputIter& __i, _Distance __n, input_iterator_tag)
00122   {
00123     // concept requirements
00124     __glibcpp_function_requires(_InputIteratorConcept<_InputIter>)
00125     while (__n--) ++__i;
00126   }
00127 
00128 template<typename _BidirectionalIterator, typename _Distance>
00129   inline void
00130   __advance(_BidirectionalIterator& __i, _Distance __n,
00131             bidirectional_iterator_tag)
00132   {
00133     // concept requirements
00134     __glibcpp_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
00135 
00136     if (__n > 0)
00137       while (__n--) ++__i;
00138     else
00139       while (__n++) --__i;
00140   }
00141 
00142 template<typename _RandomAccessIterator, typename _Distance>
00143   inline void
00144   __advance(_RandomAccessIterator& __i, _Distance __n,
00145             random_access_iterator_tag)
00146   {
00147     // concept requirements
00148     __glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
00149     __i += __n;
00150   }
00151 
00164 template<typename _InputIterator, typename _Distance>
00165   inline void
00166   advance(_InputIterator& __i, _Distance __n)
00167   {
00168     // concept requirements -- taken care of in __advance
00169     __advance(__i, __n, __iterator_category(__i));
00170   }
00171 
00172 } // namespace std
00173 
00174 #endif /* __GLIBCPP_INTERNAL_ITERATOR_BASE_FUNCS_H */
00175 
00176 
00177 // Local Variables:
00178 // mode:C++
00179 // End:

Generated on Tue Dec 23 12:34:06 2003 for libstdc++-v3 Source by doxygen 1.3.4