std_tuple/detail/value_at_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_VALUE_AT_IMPL_09242011_1744)
0008 #define BOOST_FUSION_VALUE_AT_IMPL_09242011_1744
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <tuple>
0012
0013 namespace boost { namespace fusion
0014 {
0015     struct std_tuple_tag;
0016
0017     namespace extension
0018     {
0019         template<typename T>
0020         struct value_at_impl;
0021
0022         template <>
0023         struct value_at_impl<std_tuple_tag>
0024         {
0025             template <typename Sequence, typename N>
0026             struct apply : std::tuple_element<N::value, Sequence> {};
0027         };
0028     }
0029 }}
0030
0031 #endif