[857] | 1 |
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| 2 | // NO INCLUDE GUARDS, THE HEADER IS INTENDED FOR MULTIPLE INCLUSION!
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| 3 |
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| 4 | #if !defined(BOOST_PP_IS_ITERATING)
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| 5 |
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| 6 | // Copyright Aleksey Gurtovoy 2000-2004
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| 7 | //
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| 8 | // Distributed under the Boost Software License, Version 1.0.
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| 9 | // (See accompanying file LICENSE_1_0.txt or copy at
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| 10 | // http://www.boost.org/LICENSE_1_0.txt)
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| 11 | //
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| 12 | // See http://www.boost.org/libs/mpl for documentation.
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| 13 |
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| 14 | // $Source: /cvsroot/boost/boost/boost/mpl/aux_/reverse_fold_impl_body.hpp,v $
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| 15 | // $Date: 2004/10/24 08:18:03 $
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| 16 | // $Revision: 1.3 $
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| 17 |
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| 18 | # include <boost/mpl/limits/unrolling.hpp>
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| 19 | # include <boost/mpl/aux_/preprocessor/repeat.hpp>
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| 20 | # include <boost/mpl/aux_/config/ctps.hpp>
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| 21 | # include <boost/mpl/aux_/nttp_decl.hpp>
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| 22 |
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| 23 | # include <boost/preprocessor/arithmetic/sub.hpp>
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| 24 | # include <boost/preprocessor/iterate.hpp>
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| 25 | # include <boost/preprocessor/dec.hpp>
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| 26 | # include <boost/preprocessor/inc.hpp>
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| 27 | # include <boost/preprocessor/cat.hpp>
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| 28 |
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| 29 | // local macros, #undef-ined at the end of the header
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| 30 |
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| 31 | # define AUX778076_ITER_FOLD_FORWARD_STEP(unused, n_, unused2) \
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| 32 | typedef typename apply2< \
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| 33 | ForwardOp \
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| 34 | , BOOST_PP_CAT(fwd_state,n_) \
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| 35 | , AUX778076_FOLD_IMPL_OP(BOOST_PP_CAT(iter,n_)) \
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| 36 | >::type BOOST_PP_CAT(fwd_state,BOOST_PP_INC(n_)); \
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| 37 | typedef typename mpl::next<BOOST_PP_CAT(iter,n_)>::type \
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| 38 | BOOST_PP_CAT(iter,BOOST_PP_INC(n_)); \
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| 39 | /**/
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| 40 |
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| 41 | # define AUX778076_ITER_FOLD_BACKWARD_STEP_FUNC(n_) \
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| 42 | typedef typename apply2< \
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| 43 | BackwardOp \
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| 44 | , BOOST_PP_CAT(bkwd_state,n_) \
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| 45 | , AUX778076_FOLD_IMPL_OP(BOOST_PP_CAT(iter,BOOST_PP_DEC(n_))) \
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| 46 | >::type BOOST_PP_CAT(bkwd_state,BOOST_PP_DEC(n_)); \
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| 47 | /**/
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| 48 |
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| 49 | # define AUX778076_ITER_FOLD_BACKWARD_STEP(unused, n_, j) \
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| 50 | AUX778076_ITER_FOLD_BACKWARD_STEP_FUNC( \
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| 51 | BOOST_PP_SUB_D(1,j,n_) \
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| 52 | ) \
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| 53 | /**/
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| 54 |
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| 55 | # define AUX778076_FIRST_BACKWARD_STATE_TYPEDEF(n_) \
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| 56 | typedef typename nested_chunk::state BOOST_PP_CAT(bkwd_state,n_);
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| 57 | /**/
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| 58 |
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| 59 | # define AUX778076_FOLD_IMPL_NAME \
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| 60 | BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_impl) \
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| 61 | /**/
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| 62 |
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| 63 | # define AUX778076_FOLD_CHUNK_NAME \
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| 64 | BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_chunk) \
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| 65 | /**/
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| 66 |
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| 67 | namespace boost { namespace mpl { namespace aux {
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| 68 |
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| 69 | /// forward declaration
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| 70 | template<
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| 71 | BOOST_MPL_AUX_NTTP_DECL(long, N)
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| 72 | , typename First
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| 73 | , typename Last
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| 74 | , typename State
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| 75 | , typename BackwardOp
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| 76 | , typename ForwardOp
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| 77 | >
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| 78 | struct AUX778076_FOLD_IMPL_NAME;
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| 79 |
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| 80 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
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| 81 | && !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC)
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| 82 |
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| 83 | # define BOOST_PP_ITERATION_PARAMS_1 \
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| 84 | (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/reverse_fold_impl_body.hpp>))
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| 85 | # include BOOST_PP_ITERATE()
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| 86 |
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| 87 | // implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
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| 88 | template<
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| 89 | BOOST_MPL_AUX_NTTP_DECL(long, N)
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| 90 | , typename First
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| 91 | , typename Last
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| 92 | , typename State
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| 93 | , typename BackwardOp
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| 94 | , typename ForwardOp
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| 95 | >
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| 96 | struct AUX778076_FOLD_IMPL_NAME
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| 97 | {
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| 98 | typedef First iter0;
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| 99 | typedef State fwd_state0;
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| 100 |
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| 101 | BOOST_MPL_PP_REPEAT(
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| 102 | BOOST_MPL_LIMIT_UNROLLING
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| 103 | , AUX778076_ITER_FOLD_FORWARD_STEP
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| 104 | , unused
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| 105 | )
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| 106 |
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| 107 | typedef AUX778076_FOLD_IMPL_NAME<
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| 108 | ( (N - BOOST_MPL_LIMIT_UNROLLING) < 0 ? 0 : N - BOOST_MPL_LIMIT_UNROLLING )
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| 109 | , BOOST_PP_CAT(iter,BOOST_MPL_LIMIT_UNROLLING)
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| 110 | , Last
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| 111 | , BOOST_PP_CAT(fwd_state,BOOST_MPL_LIMIT_UNROLLING)
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| 112 | , BackwardOp
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| 113 | , ForwardOp
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| 114 | > nested_chunk;
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| 115 |
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| 116 | AUX778076_FIRST_BACKWARD_STATE_TYPEDEF(BOOST_MPL_LIMIT_UNROLLING)
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| 117 |
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| 118 | BOOST_MPL_PP_REPEAT(
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| 119 | BOOST_MPL_LIMIT_UNROLLING
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| 120 | , AUX778076_ITER_FOLD_BACKWARD_STEP
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| 121 | , BOOST_MPL_LIMIT_UNROLLING
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| 122 | )
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| 123 |
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| 124 | typedef bkwd_state0 state;
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| 125 | typedef typename nested_chunk::iterator iterator;
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| 126 | };
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| 127 |
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| 128 | // fallback implementation for sequences of unknown size
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| 129 | template<
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| 130 | typename First
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| 131 | , typename Last
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| 132 | , typename State
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| 133 | , typename BackwardOp
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| 134 | , typename ForwardOp
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| 135 | >
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| 136 | struct AUX778076_FOLD_IMPL_NAME<-1,First,Last,State,BackwardOp,ForwardOp>
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| 137 | {
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| 138 | typedef AUX778076_FOLD_IMPL_NAME<
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| 139 | -1
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| 140 | , typename mpl::next<First>::type
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| 141 | , Last
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| 142 | , typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type
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| 143 | , BackwardOp
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| 144 | , ForwardOp
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| 145 | > nested_step;
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| 146 |
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| 147 | typedef typename apply2<
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| 148 | BackwardOp
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| 149 | , typename nested_step::state
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| 150 | , AUX778076_FOLD_IMPL_OP(First)
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| 151 | >::type state;
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| 152 |
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| 153 | typedef typename nested_step::iterator iterator;
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| 154 | };
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| 155 |
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| 156 | template<
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| 157 | typename Last
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| 158 | , typename State
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| 159 | , typename BackwardOp
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| 160 | , typename ForwardOp
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| 161 | >
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| 162 | struct AUX778076_FOLD_IMPL_NAME<-1,Last,Last,State,BackwardOp,ForwardOp>
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| 163 | {
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| 164 | typedef State state;
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| 165 | typedef Last iterator;
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| 166 | };
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| 167 |
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| 168 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 169 |
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| 170 | template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
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| 171 | struct AUX778076_FOLD_CHUNK_NAME;
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| 172 |
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| 173 | # define BOOST_PP_ITERATION_PARAMS_1 \
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| 174 | (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/reverse_fold_impl_body.hpp>))
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| 175 | # include BOOST_PP_ITERATE()
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| 176 |
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| 177 | // implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING
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| 178 | template< BOOST_MPL_AUX_NTTP_DECL(long, N) >
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| 179 | struct AUX778076_FOLD_CHUNK_NAME
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| 180 | {
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| 181 | template<
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| 182 | typename First
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| 183 | , typename Last
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| 184 | , typename State
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| 185 | , typename BackwardOp
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| 186 | , typename ForwardOp
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| 187 | >
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| 188 | struct result_
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| 189 | {
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| 190 | typedef First iter0;
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| 191 | typedef State fwd_state0;
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| 192 |
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| 193 | BOOST_MPL_PP_REPEAT(
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| 194 | BOOST_MPL_LIMIT_UNROLLING
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| 195 | , AUX778076_ITER_FOLD_FORWARD_STEP
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| 196 | , unused
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| 197 | )
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| 198 |
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| 199 | typedef AUX778076_FOLD_IMPL_NAME<
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| 200 | ( (N - BOOST_MPL_LIMIT_UNROLLING) < 0 ? 0 : N - BOOST_MPL_LIMIT_UNROLLING )
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| 201 | , BOOST_PP_CAT(iter,BOOST_MPL_LIMIT_UNROLLING)
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| 202 | , Last
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| 203 | , BOOST_PP_CAT(fwd_state,BOOST_MPL_LIMIT_UNROLLING)
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| 204 | , BackwardOp
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| 205 | , ForwardOp
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| 206 | > nested_chunk;
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| 207 |
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| 208 | AUX778076_FIRST_BACKWARD_STATE_TYPEDEF(BOOST_MPL_LIMIT_UNROLLING)
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| 209 |
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| 210 | BOOST_MPL_PP_REPEAT(
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| 211 | BOOST_MPL_LIMIT_UNROLLING
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| 212 | , AUX778076_ITER_FOLD_BACKWARD_STEP
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| 213 | , BOOST_MPL_LIMIT_UNROLLING
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| 214 | )
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| 215 |
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| 216 | typedef bkwd_state0 state;
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| 217 | typedef typename nested_chunk::iterator iterator;
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| 218 | };
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| 219 | };
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| 220 |
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| 221 | // fallback implementation for sequences of unknown size
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| 222 | template<
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| 223 | typename First
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| 224 | , typename Last
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| 225 | , typename State
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| 226 | , typename BackwardOp
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| 227 | , typename ForwardOp
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| 228 | >
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| 229 | struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step);
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| 230 |
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| 231 | template<
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| 232 | typename Last
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| 233 | , typename State
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| 234 | >
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| 235 | struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_null_step)
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| 236 | {
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| 237 | typedef Last iterator;
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| 238 | typedef State state;
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| 239 | };
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| 240 |
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| 241 | template<>
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| 242 | struct AUX778076_FOLD_CHUNK_NAME<-1>
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| 243 | {
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| 244 | template<
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| 245 | typename First
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| 246 | , typename Last
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| 247 | , typename State
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| 248 | , typename BackwardOp
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| 249 | , typename ForwardOp
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| 250 | >
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| 251 | struct result_
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| 252 | {
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| 253 | typedef typename if_<
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| 254 | typename is_same<First,Last>::type
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| 255 | , BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_null_step)<Last,State>
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| 256 | , BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step)<First,Last,State,BackwardOp,ForwardOp>
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| 257 | >::type res_;
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| 258 |
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| 259 | typedef typename res_::state state;
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| 260 | typedef typename res_::iterator iterator;
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| 261 | };
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| 262 |
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| 263 | #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
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| 264 | /// ETI workaround
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| 265 | template<> struct result_<int,int,int,int,int>
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| 266 | {
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| 267 | typedef int state;
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| 268 | typedef int iterator;
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| 269 | };
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| 270 | #endif
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| 271 | };
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| 272 |
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| 273 | template<
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| 274 | typename First
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| 275 | , typename Last
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| 276 | , typename State
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| 277 | , typename BackwardOp
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| 278 | , typename ForwardOp
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| 279 | >
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| 280 | struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step)
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| 281 | {
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| 282 | typedef AUX778076_FOLD_CHUNK_NAME<-1>::template result_<
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| 283 | typename mpl::next<First>::type
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| 284 | , Last
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| 285 | , typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type
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| 286 | , BackwardOp
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| 287 | , ForwardOp
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| 288 | > nested_step;
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| 289 |
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| 290 | typedef typename apply2<
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| 291 | BackwardOp
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| 292 | , typename nested_step::state
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| 293 | , AUX778076_FOLD_IMPL_OP(First)
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| 294 | >::type state;
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| 295 |
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| 296 | typedef typename nested_step::iterator iterator;
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| 297 | };
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| 298 |
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| 299 | template<
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| 300 | BOOST_MPL_AUX_NTTP_DECL(long, N)
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| 301 | , typename First
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| 302 | , typename Last
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| 303 | , typename State
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| 304 | , typename BackwardOp
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| 305 | , typename ForwardOp
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| 306 | >
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| 307 | struct AUX778076_FOLD_IMPL_NAME
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| 308 | : AUX778076_FOLD_CHUNK_NAME<N>
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| 309 | ::template result_<First,Last,State,BackwardOp,ForwardOp>
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| 310 | {
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| 311 | };
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| 312 |
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| 313 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 314 |
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| 315 | }}}
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| 316 |
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| 317 | # undef AUX778076_FIRST_BACKWARD_STATE_TYPEDEF
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| 318 | # undef AUX778076_ITER_FOLD_BACKWARD_STEP
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| 319 | # undef AUX778076_ITER_FOLD_BACKWARD_STEP_FUNC
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| 320 | # undef AUX778076_ITER_FOLD_FORWARD_STEP
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| 321 |
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| 322 | #undef AUX778076_FOLD_IMPL_OP
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| 323 | #undef AUX778076_FOLD_IMPL_NAME_PREFIX
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| 324 |
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| 325 | ///// iteration
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| 326 |
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| 327 | #else
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| 328 |
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| 329 | # define n_ BOOST_PP_FRAME_ITERATION(1)
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| 330 |
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| 331 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
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| 332 | && !defined(BOOST_MPL_CFG_NO_NONTYPE_TEMPLATE_PARTIAL_SPEC)
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| 333 |
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| 334 | template<
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| 335 | typename First
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| 336 | , typename Last
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| 337 | , typename State
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| 338 | , typename BackwardOp
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| 339 | , typename ForwardOp
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| 340 | >
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| 341 | struct AUX778076_FOLD_IMPL_NAME<n_,First,Last,State,BackwardOp,ForwardOp>
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| 342 | {
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| 343 | typedef First iter0;
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| 344 | typedef State fwd_state0;
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| 345 |
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| 346 | BOOST_MPL_PP_REPEAT(
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| 347 | n_
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| 348 | , AUX778076_ITER_FOLD_FORWARD_STEP
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| 349 | , unused
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| 350 | )
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| 351 |
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| 352 | typedef BOOST_PP_CAT(fwd_state,n_) BOOST_PP_CAT(bkwd_state,n_);
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| 353 |
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| 354 | BOOST_MPL_PP_REPEAT(
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| 355 | n_
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| 356 | , AUX778076_ITER_FOLD_BACKWARD_STEP
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| 357 | , n_
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| 358 | )
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| 359 |
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| 360 | typedef bkwd_state0 state;
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| 361 | typedef BOOST_PP_CAT(iter,n_) iterator;
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| 362 | };
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| 363 |
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| 364 | #else
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| 365 |
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| 366 | template<> struct AUX778076_FOLD_CHUNK_NAME<n_>
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| 367 | {
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| 368 | template<
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| 369 | typename First
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| 370 | , typename Last
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| 371 | , typename State
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| 372 | , typename BackwardOp
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| 373 | , typename ForwardOp
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| 374 | >
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| 375 | struct result_
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| 376 | {
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| 377 | typedef First iter0;
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| 378 | typedef State fwd_state0;
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| 379 |
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| 380 | BOOST_MPL_PP_REPEAT(
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| 381 | n_
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| 382 | , AUX778076_ITER_FOLD_FORWARD_STEP
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| 383 | , unused
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| 384 | )
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| 385 |
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| 386 | typedef BOOST_PP_CAT(fwd_state,n_) BOOST_PP_CAT(bkwd_state,n_);
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| 387 |
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| 388 | BOOST_MPL_PP_REPEAT(
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| 389 | n_
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| 390 | , AUX778076_ITER_FOLD_BACKWARD_STEP
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| 391 | , n_
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| 392 | )
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| 393 |
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| 394 | typedef bkwd_state0 state;
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| 395 | typedef BOOST_PP_CAT(iter,n_) iterator;
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| 396 | };
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| 397 |
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| 398 | #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG)
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| 399 | /// ETI workaround
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| 400 | template<> struct result_<int,int,int,int,int>
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| 401 | {
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| 402 | typedef int state;
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| 403 | typedef int iterator;
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| 404 | };
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| 405 | #endif
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| 406 | };
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| 407 |
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| 408 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 409 |
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| 410 | # undef n_
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| 411 |
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| 412 | #endif // BOOST_PP_IS_ITERATING
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