release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/include/c++/4.5.3/bits/stl_iterator_base_types.h

   1 // Types used in iterator implementation -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 /*
  27  *
  28  * Copyright (c) 1994
  29  * Hewlett-Packard Company
  30  *
  31  * Permission to use, copy, modify, distribute and sell this software
  32  * and its documentation for any purpose is hereby granted without fee,
  33  * provided that the above copyright notice appear in all copies and
  34  * that both that copyright notice and this permission notice appear
  35  * in supporting documentation.  Hewlett-Packard Company makes no
  36  * representations about the suitability of this software for any
  37  * purpose.  It is provided "as is" without express or implied warranty.
  38  *
  39  *
  40  * Copyright (c) 1996-1998
  41  * Silicon Graphics Computer Systems, Inc.
  42  *
  43  * Permission to use, copy, modify, distribute and sell this software
  44  * and its documentation for any purpose is hereby granted without fee,
  45  * provided that the above copyright notice appear in all copies and
  46  * that both that copyright notice and this permission notice appear
  47  * in supporting documentation.  Silicon Graphics makes no
  48  * representations about the suitability of this software for any
  49  * purpose.  It is provided "as is" without express or implied warranty.
  50  */
  51
  52 /** @file stl_iterator_base_types.h
  53  *  This is an internal header file, included by other library headers.
  54  *  You should not attempt to use it directly.
  55  *
  56  *  This file contains all of the general iterator-related utility types,
  57  *  such as iterator_traits and struct iterator.
  58  */
  59
  60 #ifndef _STL_ITERATOR_BASE_TYPES_H
  61 #define _STL_ITERATOR_BASE_TYPES_H 1
  62
  63 #pragma GCC system_header
  64
  65 #include <bits/c++config.h>
  66 #include <cstddef>
  67
  68 _GLIBCXX_BEGIN_NAMESPACE(std)
  69
  70   /**
  71    *  @defgroup iterators Iterators
  72    *  Abstractions for uniform iterating through various underlying types.
  73   */
  74   //@{
  75
  76   /**
  77    *  @defgroup iterator_tags Iterator Tags
  78    *  These are empty types, used to distinguish different iterators.  The
  79    *  distinction is not made by what they contain, but simply by what they
  80    *  are.  Different underlying algorithms can then be used based on the
  81    *  different operations supported by different iterator types.
  82   */
  83   //@{
  84   ///  Marking input iterators.
  85   struct input_iterator_tag { };
  86
  87   ///  Marking output iterators.
  88   struct output_iterator_tag { };
  89
  90   /// Forward iterators support a superset of input iterator operations.
  91   struct forward_iterator_tag : public input_iterator_tag { };
  92
  93   /// Bidirectional iterators support a superset of forward iterator
  94   /// operations.
  95   struct bidirectional_iterator_tag : public forward_iterator_tag { };
  96
  97   /// Random-access iterators support a superset of bidirectional
  98   /// iterator operations.
  99   struct random_access_iterator_tag : public bidirectional_iterator_tag { };
 100   //@}
 101
 102   /**
 103    *  @brief  Common %iterator class.
 104    *
 105    *  This class does nothing but define nested typedefs.  %Iterator classes
 106    *  can inherit from this class to save some work.  The typedefs are then
 107    *  used in specializations and overloading.
 108    *
 109    *  In particular, there are no default implementations of requirements
 110    *  such as @c operator++ and the like.  (How could there be?)
 111   */
 112   template<typename _Category, typename _Tp, typename _Distance = ptrdiff_t,
 113            typename _Pointer = _Tp*, typename _Reference = _Tp&>
 114     struct iterator
 115     {
 116       /// One of the @link iterator_tags tag types@endlink.
 117       typedef _Category  iterator_category;
 118       /// The type "pointed to" by the iterator.
 119       typedef _Tp        value_type;
 120       /// Distance between iterators is represented as this type.
 121       typedef _Distance  difference_type;
 122       /// This type represents a pointer-to-value_type.
 123       typedef _Pointer   pointer;
 124       /// This type represents a reference-to-value_type.
 125       typedef _Reference reference;
 126     };
 127
 128   /**
 129    *  @brief  Traits class for iterators.
 130    *
 131    *  This class does nothing but define nested typedefs.  The general
 132    *  version simply @a forwards the nested typedefs from the Iterator
 133    *  argument.  Specialized versions for pointers and pointers-to-const
 134    *  provide tighter, more correct semantics.
 135   */
 136   template<typename _Iterator>
 137     struct iterator_traits
 138     {
 139       typedef typename _Iterator::iterator_category iterator_category;
 140       typedef typename _Iterator::value_type        value_type;
 141       typedef typename _Iterator::difference_type   difference_type;
 142       typedef typename _Iterator::pointer           pointer;
 143       typedef typename _Iterator::reference         reference;
 144     };
 145
 146   /// Partial specialization for pointer types.
 147   template<typename _Tp>
 148     struct iterator_traits<_Tp*>
 149     {
 150       typedef random_access_iterator_tag iterator_category;
 151       typedef _Tp                         value_type;
 152       typedef ptrdiff_t                   difference_type;
 153       typedef _Tp*                        pointer;
 154       typedef _Tp&                        reference;
 155     };
 156
 157   /// Partial specialization for const pointer types.
 158   template<typename _Tp>
 159     struct iterator_traits<const _Tp*>
 160     {
 161       typedef random_access_iterator_tag iterator_category;
 162       typedef _Tp                         value_type;
 163       typedef ptrdiff_t                   difference_type;
 164       typedef const _Tp*                  pointer;
 165       typedef const _Tp&                  reference;
 166     };
 167
 168   /**
 169    *  This function is not a part of the C++ standard but is syntactic
 170    *  sugar for internal library use only.
 171   */
 172   template<typename _Iter>
 173     inline typename iterator_traits<_Iter>::iterator_category
 174     __iterator_category(const _Iter&)
 175     { return typename iterator_traits<_Iter>::iterator_category(); }
 176
 177   //@}
 178
 179 _GLIBCXX_END_NAMESPACE
 180
 181 #endif /* _STL_ITERATOR_BASE_TYPES_H */
 182