#ifndef BOOST_MPL_VECTOR_AUX_BACK_HPP_INCLUDED

#define BOOST_MPL_VECTOR_AUX_BACK_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2000-2004

//

// 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)

//

// See http://www.boost.org/libs/mpl for documentation.

// $Source: /cvsroot/boost/boost/boost/mpl/vector/aux_/back.hpp,v $

// $Date: 2004/09/02 15:41:19 $

// $Revision: 1.4 $

#include <boost/mpl/back_fwd.hpp>

#include <boost/mpl/next_prior.hpp>

#include <boost/mpl/vector/aux_/at.hpp>

#include <boost/mpl/vector/aux_/tag.hpp>

#include <boost/mpl/aux_/config/typeof.hpp>

#include <boost/mpl/aux_/config/ctps.hpp>

namespace boost { namespace mpl {

#if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)

template<>

struct back_impl< aux::vector_tag >

{

    template< typename Vector > struct apply

        : v_at<

              Vector

            , prior<typename Vector::size>::type::value

            >

    {

    };

};

#else

#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)

template< long n_ >

struct back_impl< aux::vector_tag<n_> >

{

    template< typename Vector > struct apply

    {

        typedef typename Vector::back type;

    };

};

#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

#endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES

}}

#endif // BOOST_MPL_VECTOR_AUX_BACK_HPP_INCLUDED