

#if !defined(BOOST_PP_IS_ITERATING)



///// header body



#ifndef BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED

#define BOOST_MPL_AUX778076_ADVANCE_BACKWARD_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.



// $Source$

// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $

// $Revision: 24874 $



#if !defined(BOOST_MPL_PREPROCESSING_MODE)

#   include <boost/mpl/prior.hpp>

#   include <boost/mpl/apply_wrap.hpp>

#endif



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



#if    !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \

    && !defined(BOOST_MPL_PREPROCESSING_MODE)



#   define BOOST_MPL_PREPROCESSED_HEADER advance_backward.hpp

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



#else



#   include <boost/mpl/limits/unrolling.hpp>

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

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



#   include <boost/preprocessor/iterate.hpp>

#   include <boost/preprocessor/cat.hpp>

#   include <boost/preprocessor/inc.hpp>



namespace boost { namespace mpl { namespace aux {



// forward declaration

template< BOOST_MPL_AUX_NTTP_DECL(long, N) > struct advance_backward;



#   define BOOST_PP_ITERATION_PARAMS_1 \

    (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/advance_backward.hpp>))

#   include BOOST_PP_ITERATE()



// implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING

template< BOOST_MPL_AUX_NTTP_DECL(long, N) >

struct advance_backward

{

    template< typename Iterator > struct apply

    {

        typedef typename apply_wrap1<

              advance_backward<BOOST_MPL_LIMIT_UNROLLING>

            , Iterator

            >::type chunk_result_;



        typedef typename apply_wrap1<

              advance_backward<(

                (N - BOOST_MPL_LIMIT_UNROLLING) < 0

                    ? 0

                    : N - BOOST_MPL_LIMIT_UNROLLING

                    )>

            , chunk_result_

            >::type type;

    };

};



}}}



#endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS

#endif // BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED



///// iteration, depth == 1



#elif BOOST_PP_ITERATION_DEPTH() == 1

#define i_ BOOST_PP_FRAME_ITERATION(1)



template<>

struct advance_backward< BOOST_PP_FRAME_ITERATION(1) >

{

    template< typename Iterator > struct apply

    {

        typedef Iterator iter0;



#if i_ > 0

#   define BOOST_PP_ITERATION_PARAMS_2 \

    (3,(1, BOOST_PP_FRAME_ITERATION(1), <boost/mpl/aux_/advance_backward.hpp>))

#   include BOOST_PP_ITERATE()

#endif



        typedef BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(1)) type;

    };



#if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)

    /// ETI workaround

    template<> struct apply<int>

    {

        typedef int type;

    };

#endif

};



#undef i_



///// iteration, depth == 2



#elif BOOST_PP_ITERATION_DEPTH() == 2



#   define AUX778076_ITER_0 BOOST_PP_CAT(iter,BOOST_PP_DEC(BOOST_PP_FRAME_ITERATION(2)))

#   define AUX778076_ITER_1 BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(2))



        typedef typename prior<AUX778076_ITER_0>::type AUX778076_ITER_1;

        

#   undef AUX778076_ITER_1

#   undef AUX778076_ITER_0



#endif // BOOST_PP_IS_ITERATING

