#ifndef BOOST_MPL_NEXT_PRIOR_HPP_INCLUDED

#define BOOST_MPL_NEXT_PRIOR_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.

// $Id$

// $Date$

// $Revision$

#include <boost/mpl/aux_/common_name_wknd.hpp>

#include <boost/mpl/aux_/na_spec.hpp>

#include <boost/mpl/aux_/lambda_support.hpp>

namespace boost { namespace mpl {

BOOST_MPL_AUX_COMMON_NAME_WKND(next)

BOOST_MPL_AUX_COMMON_NAME_WKND(prior)

template<

      typename BOOST_MPL_AUX_NA_PARAM(T)

    >

struct next

{

    typedef typename T::next type;

    BOOST_MPL_AUX_LAMBDA_SUPPORT(1,next,(T))

};

template<

      typename BOOST_MPL_AUX_NA_PARAM(T)

    >

struct prior

{

    typedef typename T::prior type;

    BOOST_MPL_AUX_LAMBDA_SUPPORT(1,prior,(T))

};

BOOST_MPL_AUX_NA_SPEC(1, next)

BOOST_MPL_AUX_NA_SPEC(1, prior)

}}

#endif // BOOST_MPL_NEXT_PRIOR_HPP_INCLUDED