2 #if !defined(BOOST_PP_IS_ITERATING)
6 #ifndef BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
7 #define BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
9 // Copyright Aleksey Gurtovoy 2000-2004
11 // Distributed under the Boost Software License, Version 1.0.
12 // (See accompanying file LICENSE_1_0.txt or copy at
13 // http://www.boost.org/LICENSE_1_0.txt)
15 // See http://www.boost.org/libs/mpl for documentation.
17 // $Id: advance_backward.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
18 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
21 #if !defined(BOOST_MPL_PREPROCESSING_MODE)
22 # include <boost/mpl/prior.hpp>
23 # include <boost/mpl/apply_wrap.hpp>
26 #include <boost/mpl/aux_/config/use_preprocessed.hpp>
28 #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
29 && !defined(BOOST_MPL_PREPROCESSING_MODE)
31 # define BOOST_MPL_PREPROCESSED_HEADER advance_backward.hpp
32 # include <boost/mpl/aux_/include_preprocessed.hpp>
36 # include <boost/mpl/limits/unrolling.hpp>
37 # include <boost/mpl/aux_/nttp_decl.hpp>
38 # include <boost/mpl/aux_/config/eti.hpp>
40 # include <boost/preprocessor/iterate.hpp>
41 # include <boost/preprocessor/cat.hpp>
42 # include <boost/preprocessor/inc.hpp>
44 namespace boost { namespace mpl { namespace aux {
46 // forward declaration
47 template< BOOST_MPL_AUX_NTTP_DECL(long, N) > struct advance_backward;
49 # define BOOST_PP_ITERATION_PARAMS_1 \
50 (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/advance_backward.hpp>))
51 # include BOOST_PP_ITERATE()
53 // implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
54 template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
55 struct advance_backward
57 template< typename Iterator > struct apply
59 typedef typename apply_wrap1<
60 advance_backward<BOOST_MPL_LIMIT_UNROLLING>
62 >::type chunk_result_;
64 typedef typename apply_wrap1<
66 (N - BOOST_MPL_LIMIT_UNROLLING) < 0
68 : N - BOOST_MPL_LIMIT_UNROLLING
77 #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
78 #endif // BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
80 ///// iteration, depth == 1
82 // For gcc 4.4 compatability, we must include the
83 // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
84 #else // BOOST_PP_IS_ITERATING
85 #if BOOST_PP_ITERATION_DEPTH() == 1
86 #define i_ BOOST_PP_FRAME_ITERATION(1)
89 struct advance_backward< BOOST_PP_FRAME_ITERATION(1) >
91 template< typename Iterator > struct apply
93 typedef Iterator iter0;
96 # define BOOST_PP_ITERATION_PARAMS_2 \
97 (3,(1, BOOST_PP_FRAME_ITERATION(1), <boost/mpl/aux_/advance_backward.hpp>))
98 # include BOOST_PP_ITERATE()
101 typedef BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(1)) type;
104 #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
106 template<> struct apply<int>
115 ///// iteration, depth == 2
117 #elif BOOST_PP_ITERATION_DEPTH() == 2
119 # define AUX778076_ITER_0 BOOST_PP_CAT(iter,BOOST_PP_DEC(BOOST_PP_FRAME_ITERATION(2)))
120 # define AUX778076_ITER_1 BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(2))
122 typedef typename prior<AUX778076_ITER_0>::type AUX778076_ITER_1;
124 # undef AUX778076_ITER_1
125 # undef AUX778076_ITER_0
127 #endif // BOOST_PP_ITERATION_DEPTH()
128 #endif // BOOST_PP_IS_ITERATING