Chris@16: 
Chris@16: #if !defined(BOOST_PP_IS_ITERATING)
Chris@16: 
Chris@16: ///// header body
Chris@16: 
Chris@16: #ifndef BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
Chris@16: #define BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
Chris@16: 
Chris@16: // Copyright Aleksey Gurtovoy 2000-2004
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. 
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/mpl for documentation.
Chris@16: 
Chris@101: // $Id$
Chris@101: // $Date$
Chris@101: // $Revision$
Chris@16: 
Chris@16: #if !defined(BOOST_MPL_PREPROCESSING_MODE)
Chris@16: #   include <boost/mpl/prior.hpp>
Chris@16: #   include <boost/mpl/apply_wrap.hpp>
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/mpl/aux_/config/use_preprocessed.hpp>
Chris@16: 
Chris@16: #if    !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
Chris@16:     && !defined(BOOST_MPL_PREPROCESSING_MODE)
Chris@16: 
Chris@16: #   define BOOST_MPL_PREPROCESSED_HEADER advance_backward.hpp
Chris@16: #   include <boost/mpl/aux_/include_preprocessed.hpp>
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16: #   include <boost/mpl/limits/unrolling.hpp>
Chris@16: #   include <boost/mpl/aux_/nttp_decl.hpp>
Chris@16: #   include <boost/mpl/aux_/config/eti.hpp>
Chris@16: 
Chris@16: #   include <boost/preprocessor/iterate.hpp>
Chris@16: #   include <boost/preprocessor/cat.hpp>
Chris@16: #   include <boost/preprocessor/inc.hpp>
Chris@16: 
Chris@16: namespace boost { namespace mpl { namespace aux {
Chris@16: 
Chris@16: // forward declaration
Chris@16: template< BOOST_MPL_AUX_NTTP_DECL(long, N) > struct advance_backward;
Chris@16: 
Chris@16: #   define BOOST_PP_ITERATION_PARAMS_1 \
Chris@16:     (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/advance_backward.hpp>))
Chris@16: #   include BOOST_PP_ITERATE()
Chris@16: 
Chris@16: // implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
Chris@16: template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
Chris@16: struct advance_backward
Chris@16: {
Chris@16:     template< typename Iterator > struct apply
Chris@16:     {
Chris@16:         typedef typename apply_wrap1<
Chris@16:               advance_backward<BOOST_MPL_LIMIT_UNROLLING>
Chris@16:             , Iterator
Chris@16:             >::type chunk_result_;
Chris@16: 
Chris@16:         typedef typename apply_wrap1<
Chris@16:               advance_backward<(
Chris@16:                 (N - BOOST_MPL_LIMIT_UNROLLING) < 0
Chris@16:                     ? 0
Chris@16:                     : N - BOOST_MPL_LIMIT_UNROLLING
Chris@16:                     )>
Chris@16:             , chunk_result_
Chris@16:             >::type type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
Chris@16: #endif // BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
Chris@16: 
Chris@16: ///// iteration, depth == 1
Chris@16: 
Chris@16: // For gcc 4.4 compatability, we must include the
Chris@16: // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
Chris@16: #else // BOOST_PP_IS_ITERATING
Chris@16: #if BOOST_PP_ITERATION_DEPTH() == 1
Chris@16: #define i_ BOOST_PP_FRAME_ITERATION(1)
Chris@16: 
Chris@16: template<>
Chris@16: struct advance_backward< BOOST_PP_FRAME_ITERATION(1) >
Chris@16: {
Chris@16:     template< typename Iterator > struct apply
Chris@16:     {
Chris@16:         typedef Iterator iter0;
Chris@16: 
Chris@16: #if i_ > 0
Chris@16: #   define BOOST_PP_ITERATION_PARAMS_2 \
Chris@16:     (3,(1, BOOST_PP_FRAME_ITERATION(1), <boost/mpl/aux_/advance_backward.hpp>))
Chris@16: #   include BOOST_PP_ITERATE()
Chris@16: #endif
Chris@16: 
Chris@16:         typedef BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(1)) type;
Chris@16:     };
Chris@16: 
Chris@16: #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
Chris@16:     /// ETI workaround
Chris@16:     template<> struct apply<int>
Chris@16:     {
Chris@16:         typedef int type;
Chris@16:     };
Chris@16: #endif
Chris@16: };
Chris@16: 
Chris@16: #undef i_
Chris@16: 
Chris@16: ///// iteration, depth == 2
Chris@16: 
Chris@16: #elif BOOST_PP_ITERATION_DEPTH() == 2
Chris@16: 
Chris@16: #   define AUX778076_ITER_0 BOOST_PP_CAT(iter,BOOST_PP_DEC(BOOST_PP_FRAME_ITERATION(2)))
Chris@16: #   define AUX778076_ITER_1 BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(2))
Chris@16: 
Chris@16:         typedef typename prior<AUX778076_ITER_0>::type AUX778076_ITER_1;
Chris@16:         
Chris@16: #   undef AUX778076_ITER_1
Chris@16: #   undef AUX778076_ITER_0
Chris@16: 
Chris@16: #endif // BOOST_PP_ITERATION_DEPTH()
Chris@16: #endif // BOOST_PP_IS_ITERATING