std_tuple/detail/begin_impl.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001-2011 Joel de Guzman
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007 #if !defined(BOOST_FUSION_BEGIN_IMPL_09242011_1744)
0008 #define BOOST_FUSION_BEGIN_IMPL_09242011_1744
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/fusion/adapted/std_tuple/std_tuple_iterator.hpp>
0012
0013 namespace boost { namespace fusion
0014 {
0015     struct std_tuple_tag;
0016
0017     namespace extension
0018     {
0019         template<typename T>
0020         struct begin_impl;
0021
0022         template <>
0023         struct begin_impl<std_tuple_tag>
0024         {
0025             template <typename Sequence>
0026             struct apply
0027             {
0028                 typedef std_tuple_iterator<Sequence, 0> type;
0029
0030                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0031                 static type
0032                 call(Sequence& v)
0033                 {
0034                     return type(v);
0035                 }
0036             };
0037         };
0038     }
0039 }}
0040
0041 #endif