3rdparty/boost/boost/fusion/iterator/iterator_adapter.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(FUSION_ITERATOR_ADAPTER_08112011_0942)
   8 #define FUSION_ITERATOR_ADAPTER_08112011_0942
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/support/category_of.hpp>
  12 #include <boost/fusion/iterator/advance.hpp>
  13 #include <boost/fusion/iterator/deref.hpp>
  14 #include <boost/fusion/iterator/distance.hpp>
  15 #include <boost/fusion/iterator/equal_to.hpp>
  16 #include <boost/fusion/iterator/iterator_facade.hpp>
  17 #include <boost/fusion/iterator/next.hpp>
  18 #include <boost/fusion/iterator/prior.hpp>
  19 #include <boost/fusion/iterator/value_of.hpp>
  20 #include <boost/type_traits/remove_const.hpp>
  21
  22 namespace boost { namespace fusion
  23 {
  24     template <typename Derived_, typename Iterator_,
  25         typename Category = typename traits::category_of<Iterator_>::type>
  26     struct iterator_adapter
  27         : iterator_facade<Derived_, Category>
  28     {
  29         typedef typename
  30             remove_const<Iterator_>::type
  31         iterator_base_type;
  32         iterator_base_type iterator_base;
  33
  34         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  35         iterator_adapter(iterator_base_type const& iterator_base_)
  36             : iterator_base(iterator_base_) {}
  37
  38         // default implementation
  39         template <typename I1, typename I2>
  40         struct equal_to
  41             : result_of::equal_to<
  42                 typename I1::iterator_base_type
  43               , typename I2::iterator_base_type
  44             >
  45         {};
  46
  47         // default implementation
  48         template <typename Iterator, typename N>
  49         struct advance
  50         {
  51             typedef typename Derived_::template make<
  52                 typename result_of::advance<
  53                     typename Iterator::iterator_base_type, N
  54                 >::type>::type
  55             type;
  56
  57             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  58             static type
  59             call(Iterator const& it)
  60             {
  61                 return type(fusion::advance<N>(it.iterator_base));
  62             }
  63         };
  64
  65         // default implementation
  66         template <typename First, typename Last>
  67         struct distance
  68             : result_of::distance<
  69                 typename First::iterator_base_type
  70               , typename Last::iterator_base_type
  71             >
  72         {};
  73
  74         // default implementation
  75         template <typename Iterator>
  76         struct value_of
  77             : result_of::value_of<
  78                 typename Iterator::iterator_base_type
  79             >
  80         {};
  81
  82         // default implementation
  83         template <typename Iterator>
  84         struct deref
  85         {
  86             typedef typename
  87                 result_of::deref<
  88                     typename Iterator::iterator_base_type
  89                 >::type
  90             type;
  91
  92             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  93             static type
  94             call(Iterator const& it)
  95             {
  96                 return fusion::deref(it.iterator_base);
  97             }
  98         };
  99
 100         // default implementation
 101         template <typename Iterator>
 102         struct next
 103         {
 104             typedef typename Derived_::template make<
 105                 typename result_of::next<
 106                     typename Iterator::iterator_base_type
 107                 >::type>::type
 108             type;
 109
 110             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 111             static type
 112             call(Iterator const& i)
 113             {
 114                 return type(fusion::next(i.iterator_base));
 115             }
 116         };
 117
 118         // default implementation
 119         template <typename Iterator>
 120         struct prior
 121         {
 122             typedef typename Derived_::template make<
 123                 typename result_of::prior<
 124                     typename Iterator::iterator_base_type
 125                 >::type>::type
 126             type;
 127
 128             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 129             static type
 130             call(Iterator const& i)
 131             {
 132                 return type(fusion::prior(i.iterator_base));
 133             }
 134         };
 135     };
 136 }}
 137
 138 #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
 139 namespace std
 140 {
 141     template <typename Derived, typename Iterator, typename Category>
 142     struct iterator_traits< ::boost::fusion::iterator_adapter<Derived, Iterator, Category> >
 143     { };
 144 }
 145 #endif
 146
 147 #endif