boost/fusion/adapted/mpl/detail/begin_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(BOOST_FUSION_BEGIN_IMPL_31122005_1209)
   9 #define BOOST_FUSION_BEGIN_IMPL_31122005_1209
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/adapted/mpl/mpl_iterator.hpp>
  13 #include <boost/mpl/begin.hpp>
  14 #include <boost/type_traits/remove_const.hpp>
  15
  16 namespace boost { namespace fusion {
  17
  18     struct mpl_sequence_tag;
  19
  20     namespace extension
  21     {
  22         template <typename Tag>
  23         struct begin_impl;
  24
  25         template <>
  26         struct begin_impl<mpl_sequence_tag>
  27         {
  28             template <typename Sequence>
  29             struct apply
  30             {
  31                 typedef typename mpl::begin<
  32                     typename remove_const<Sequence>::type
  33                 >::type iterator;
  34                 typedef mpl_iterator<iterator> type;
  35
  36                 BOOST_FUSION_GPU_ENABLED
  37                 static type
  38                 call(Sequence)
  39                 {
  40                     return type();
  41                 }
  42             };
  43         };
  44     }
  45 }}
  46
  47 #endif