source: NonGTP/Boost/boost/mpl/aux_/advance_backward.hpp @ 857

Revision 857, 3.4 KB checked in by igarcia, 19 years ago (diff)
Line 
1
2#if !defined(BOOST_PP_IS_ITERATING)
3
4///// header body
5
6#ifndef BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
7#define BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
8
9// Copyright Aleksey Gurtovoy 2000-2004
10//
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)
14//
15// See http://www.boost.org/libs/mpl for documentation.
16
17// $Source: /cvsroot/boost/boost/boost/mpl/aux_/advance_backward.hpp,v $
18// $Date: 2004/09/02 15:40:43 $
19// $Revision: 1.9 $
20
21#if !defined(BOOST_MPL_PREPROCESSING_MODE)
22#   include <boost/mpl/prior.hpp>
23#   include <boost/mpl/apply_wrap.hpp>
24#endif
25
26#include <boost/mpl/aux_/config/use_preprocessed.hpp>
27
28#if    !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
29    && !defined(BOOST_MPL_PREPROCESSING_MODE)
30
31#   define BOOST_MPL_PREPROCESSED_HEADER advance_backward.hpp
32#   include <boost/mpl/aux_/include_preprocessed.hpp>
33
34#else
35
36#   include <boost/mpl/limits/unrolling.hpp>
37#   include <boost/mpl/aux_/nttp_decl.hpp>
38#   include <boost/mpl/aux_/config/eti.hpp>
39
40#   include <boost/preprocessor/iterate.hpp>
41#   include <boost/preprocessor/cat.hpp>
42#   include <boost/preprocessor/inc.hpp>
43
44namespace boost { namespace mpl { namespace aux {
45
46// forward declaration
47template< BOOST_MPL_AUX_NTTP_DECL(long, N) > struct advance_backward;
48
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()
52
53// implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
54template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
55struct advance_backward
56{
57    template< typename Iterator > struct apply
58    {
59        typedef typename apply_wrap1<
60              advance_backward<BOOST_MPL_LIMIT_UNROLLING>
61            , Iterator
62            >::type chunk_result_;
63
64        typedef typename apply_wrap1<
65              advance_backward<(
66                (N - BOOST_MPL_LIMIT_UNROLLING) < 0
67                    ? 0
68                    : N - BOOST_MPL_LIMIT_UNROLLING
69                    )>
70            , chunk_result_
71            >::type type;
72    };
73};
74
75}}}
76
77#endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
78#endif // BOOST_MPL_AUX778076_ADVANCE_BACKWARD_HPP_INCLUDED
79
80///// iteration, depth == 1
81
82#elif BOOST_PP_ITERATION_DEPTH() == 1
83#define i_ BOOST_PP_FRAME_ITERATION(1)
84
85template<>
86struct advance_backward< BOOST_PP_FRAME_ITERATION(1) >
87{
88    template< typename Iterator > struct apply
89    {
90        typedef Iterator iter0;
91
92#if i_ > 0
93#   define BOOST_PP_ITERATION_PARAMS_2 \
94    (3,(1, BOOST_PP_FRAME_ITERATION(1), <boost/mpl/aux_/advance_backward.hpp>))
95#   include BOOST_PP_ITERATE()
96#endif
97
98        typedef BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(1)) type;
99    };
100
101#if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
102    /// ETI workaround
103    template<> struct apply<int>
104    {
105        typedef int type;
106    };
107#endif
108};
109
110#undef i_
111
112///// iteration, depth == 2
113
114#elif BOOST_PP_ITERATION_DEPTH() == 2
115
116#   define AUX778076_ITER_0 BOOST_PP_CAT(iter,BOOST_PP_DEC(BOOST_PP_FRAME_ITERATION(2)))
117#   define AUX778076_ITER_1 BOOST_PP_CAT(iter,BOOST_PP_FRAME_ITERATION(2))
118
119        typedef typename prior<AUX778076_ITER_0>::type AUX778076_ITER_1;
120       
121#   undef AUX778076_ITER_1
122#   undef AUX778076_ITER_0
123
124#endif // BOOST_PP_IS_ITERATING
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