/*=============================================================================

    Copyright (c) 2001-2006 Joel de Guzman



    Distributed under the Boost Software License, Version 1.0. (See accompanying 

    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

==============================================================================*/

#if !defined(FUSION_BACK_09162005_0350)

#define FUSION_BACK_09162005_0350



#include <boost/fusion/sequence/intrinsic/end.hpp>

#include <boost/fusion/iterator/prior.hpp>

#include <boost/fusion/iterator/deref.hpp>

#include <boost/mpl/bool.hpp>



namespace boost { namespace fusion

{

    struct fusion_sequence_tag;



    namespace result_of

    {

        template <typename Sequence>

        struct back

            : result_of::deref<typename result_of::prior<typename result_of::end<Sequence>::type>::type>

        {};

    }

    

    template <typename Sequence>

    inline typename result_of::back<Sequence>::type

    back(Sequence& seq)

    {

        return *fusion::prior(fusion::end(seq));

    }



    template <typename Sequence>

    inline typename result_of::back<Sequence const>::type

    back(Sequence const& seq)

    {

        return *fusion::prior(fusion::end(seq));

    }

}}



#endif

