boost/fusion/container/map/detail/cpp03/convert_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_CONVERT_IMPL_09232005_1340)
   9 #define FUSION_CONVERT_IMPL_09232005_1340
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/container/map/detail/cpp03/as_map.hpp>
  13 #include <boost/fusion/container/map/detail/cpp03/map.hpp>
  14 #include <boost/fusion/sequence/intrinsic/begin.hpp>
  15 #include <boost/fusion/sequence/intrinsic/size.hpp>
  16
  17 namespace boost { namespace fusion
  18 {
  19     struct map_tag;
  20
  21     namespace extension
  22     {
  23         template <typename T>
  24         struct convert_impl;
  25
  26         template <>
  27         struct convert_impl<map_tag>
  28         {
  29             template <typename Sequence>
  30             struct apply
  31             {
  32                 typedef typename
  33                     detail::as_map<
  34                         result_of::size<Sequence>::value
  35                       , is_base_of<
  36                             associative_tag
  37                           , typename traits::category_of<Sequence>::type>::value
  38                     >
  39                 gen;
  40                 typedef typename gen::
  41                     template apply<typename result_of::begin<Sequence>::type>::type
  42                 type;
  43
  44                 BOOST_FUSION_GPU_ENABLED
  45                 static type call(Sequence& seq)
  46                 {
  47                     return gen::call(fusion::begin(seq));
  48                 }
  49             };
  50         };
  51     }
  52 }}
  53
  54 #endif