3rdparty/boost/boost/fusion/adapted/mpl/mpl_iterator.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_MPL_ITERATOR_05052005_0731)
   8 #define FUSION_MPL_ITERATOR_05052005_0731
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/support/detail/mpl_iterator_category.hpp>
  12 #include <boost/fusion/iterator/iterator_facade.hpp>
  13 #include <boost/type_traits/remove_const.hpp>
  14 #include <boost/mpl/deref.hpp>
  15 #include <boost/mpl/next.hpp>
  16 #include <boost/mpl/prior.hpp>
  17 #include <boost/mpl/advance.hpp>
  18 #include <boost/mpl/distance.hpp>
  19
  20 namespace boost { namespace fusion
  21 {
  22     template <typename Iterator_>
  23     struct mpl_iterator
  24         : iterator_facade<
  25             mpl_iterator<Iterator_>
  26           , typename detail::mpl_iterator_category<typename Iterator_::category>::type
  27         >
  28     {
  29         typedef typename remove_const<Iterator_>::type iterator_type;
  30
  31         template <typename Iterator>
  32         struct value_of : mpl::deref<typename Iterator::iterator_type> {};
  33
  34         template <typename Iterator>
  35         struct deref
  36         {
  37             typedef typename mpl::deref<
  38                 typename Iterator::iterator_type>::type
  39             type;
  40
  41             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  42             static type
  43             call(Iterator)
  44             {
  45                 return type();
  46             }
  47         };
  48
  49         template <typename Iterator>
  50         struct next
  51         {
  52             typedef mpl_iterator<
  53                 typename mpl::next<typename Iterator::iterator_type>::type>
  54             type;
  55
  56             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  57             static type
  58             call(Iterator)
  59             {
  60                 return type();
  61             }
  62         };
  63
  64         template <typename Iterator>
  65         struct prior
  66         {
  67             typedef mpl_iterator<
  68                 typename mpl::prior<typename Iterator::iterator_type>::type>
  69             type;
  70
  71             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  72             static type
  73             call(Iterator)
  74             {
  75                 return type();
  76             }
  77         };
  78
  79         template <typename Iterator, typename N>
  80         struct advance
  81         {
  82             typedef mpl_iterator<
  83                 typename mpl::advance<typename Iterator::iterator_type, N>::type>
  84             type;
  85
  86             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  87             static type
  88             call(Iterator const& /*i*/)
  89             {
  90                 return type();
  91             }
  92         };
  93
  94         template <typename I1, typename I2>
  95         struct distance :
  96             mpl::distance<
  97                 typename I1::iterator_type
  98               , typename I2::iterator_type>
  99         {
 100             typedef typename
 101                 mpl::distance<
 102                     typename I1::iterator_type
 103                   , typename I2::iterator_type
 104                 >::type
 105             type;
 106
 107             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
 108             static type
 109             call(I1 const&, I2 const&)
 110             {
 111                 return type();
 112             }
 113         };
 114     };
 115 }}
 116
 117 #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
 118 namespace std
 119 {
 120     template <typename Iterator>
 121     struct iterator_traits< ::boost::fusion::mpl_iterator<Iterator> >
 122     { };
 123 }
 124 #endif
 125
 126 #endif
 127
 128