fusion/mpl/front.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(FUSION_FRONT_10022005_1618)
0008 #define FUSION_FRONT_10022005_1618
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/mpl/front.hpp>
0012 #include <boost/fusion/sequence/intrinsic/begin.hpp>
0013 #include <boost/fusion/iterator/value_of.hpp>
0014
0015 namespace boost { namespace mpl
0016 {
0017     template <typename Tag>
0018     struct front_impl;
0019
0020     template <>
0021     struct front_impl<fusion::fusion_sequence_tag>
0022     {
0023         template <typename Sequence>
0024         struct apply :
0025             fusion::result_of::value_of<typename fusion::result_of::begin<Sequence>::type> {};
0026     };
0027 }}
0028
0029 #endif