fusion/mpl/back.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_BACK_10022005_1620)
0008 #define FUSION_BACK_10022005_1620
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/mpl/back.hpp>
0012 #include <boost/fusion/sequence/intrinsic/end.hpp>
0013 #include <boost/fusion/iterator/prior.hpp>
0014 #include <boost/fusion/iterator/value_of.hpp>
0015
0016 namespace boost { namespace mpl
0017 {
0018     template <typename Tag>
0019     struct back_impl;
0020
0021     template <>
0022     struct back_impl<fusion::fusion_sequence_tag>
0023     {
0024         template <typename Sequence>
0025         struct apply :
0026             fusion::result_of::value_of<
0027                 typename fusion::result_of::prior<
0028                     typename fusion::result_of::end<Sequence>::type
0029                 >::type> {};
0030     };
0031 }}
0032
0033 #endif