1 /*============================================================================= 2 Copyright (c) 2001-2011 Joel de Guzman 3 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 ==============================================================================*/ 7 #if !defined(BOOST_FUSION_VALUE_AT_IMPL_09262006_1926) 8 #define BOOST_FUSION_VALUE_AT_IMPL_09262006_1926 9 10 #include <boost/fusion/support/config.hpp> 11 #include <boost/tuple/tuple.hpp> 12 13 namespace boost { namespace fusion 14 { 15 struct boost_tuple_tag; 16 17 namespace extension 18 { 19 template<typename T> 20 struct value_at_impl; 21 22 template <> 23 struct value_at_impl<boost_tuple_tag> 24 { 25 template <typename Sequence, typename N> 26 struct apply : tuples::element<N::value, Sequence> {}; 27 }; 28 } 29 }} 30 31 #endif 32