git.sesse.net Git - casparcg/blob - dependencies/boost/boost/fusion/view/transform_view/detail/advance_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2005-2006 Dan Marsden
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(FUSION_ADVANCE_IMPL_13122005_1906)
   9 #define FUSION_ADVANCE_IMPL_13122005_1906
  10
  11 #include <boost/fusion/iterator/advance.hpp>
  12
  13 namespace boost { namespace fusion
  14 {
  15     struct transform_view_iterator_tag;
  16     struct transform_view_iterator2_tag;
  17
  18     template<typename First, typename F>
  19     struct transform_view_iterator;
  20
  21     template <typename First1, typename First2, typename F>
  22     struct transform_view_iterator2;
  23
  24     namespace extension
  25     {
  26         template<typename Tag>
  27         struct advance_impl;
  28
  29         // Unary Version
  30         template<>
  31         struct advance_impl<transform_view_iterator_tag>
  32         {
  33             template<typename Iterator, typename Dist>
  34             struct apply
  35             {
  36                 typedef typename Iterator::first_type first_type;
  37                 typedef typename result_of::advance<first_type, Dist>::type advanced_type;
  38                 typedef typename Iterator::transform_type transform_type;
  39                 typedef transform_view_iterator<advanced_type, transform_type> type;
  40
  41                 static type
  42                 call(Iterator const& i)
  43                 {
  44                     return type(boost::fusion::advance<Dist>(i.first), i.f);
  45                 }
  46             };
  47         };
  48
  49         // Binary Version
  50         template<>
  51         struct advance_impl<transform_view_iterator2_tag>
  52         {
  53             template<typename Iterator, typename Dist>
  54             struct apply
  55             {
  56                 typedef typename Iterator::first1_type first1_type;
  57                 typedef typename Iterator::first2_type first2_type;
  58                 typedef typename result_of::advance<first1_type, Dist>::type advanced1_type;
  59                 typedef typename result_of::advance<first2_type, Dist>::type advanced2_type;
  60                 typedef typename Iterator::transform_type transform_type;
  61                 typedef transform_view_iterator2<advanced1_type, advanced2_type, transform_type> type;
  62
  63                 static type
  64                 call(Iterator const& i)
  65                 {
  66                     return type(
  67                         boost::fusion::advance<Dist>(i.first1)
  68                       , boost::fusion::advance<Dist>(i.first2), i.f);
  69                 }
  70             };
  71         };
  72     }
  73 }}
  74
  75 #endif