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| 2 | #ifndef BOOST_MPL_AUX_ITER_FOLD_IF_IMPL_HPP_INCLUDED
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| 3 | #define BOOST_MPL_AUX_ITER_FOLD_IF_IMPL_HPP_INCLUDED
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| 4 |
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| 5 | // Copyright Aleksey Gurtovoy 2001-2004
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| 6 | // Copyright David Abrahams 2001-2002
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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_/iter_fold_if_impl.hpp,v $
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| 15 | // $Date: 2004/09/02 15:40:43 $
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| 16 | // $Revision: 1.8 $
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| 17 |
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| 18 | #if !defined(BOOST_MPL_PREPROCESSING_MODE)
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| 19 | # include <boost/mpl/identity.hpp>
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| 20 | # include <boost/mpl/next.hpp>
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| 21 | # include <boost/mpl/if.hpp>
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| 22 | # include <boost/mpl/apply.hpp>
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| 23 | # include <boost/mpl/aux_/value_wknd.hpp>
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| 24 | #endif
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| 25 |
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| 26 | #include <boost/mpl/aux_/config/use_preprocessed.hpp>
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| 27 |
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| 28 | #if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
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| 29 | && !defined(BOOST_MPL_PREPROCESSING_MODE)
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| 30 |
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| 31 | # define BOOST_MPL_PREPROCESSED_HEADER iter_fold_if_impl.hpp
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| 32 | # include <boost/mpl/aux_/include_preprocessed.hpp>
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| 33 |
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| 34 | #else
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| 35 |
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| 36 | # include <boost/mpl/limits/unrolling.hpp>
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| 37 | # include <boost/preprocessor/arithmetic/sub.hpp>
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| 38 | # include <boost/preprocessor/repeat.hpp>
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| 39 | # include <boost/preprocessor/inc.hpp>
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| 40 | # include <boost/preprocessor/dec.hpp>
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| 41 | # include <boost/preprocessor/cat.hpp>
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| 42 |
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| 43 | namespace boost { namespace mpl { namespace aux {
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| 44 |
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| 45 | template< typename Iterator, typename State >
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| 46 | struct iter_fold_if_null_step
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| 47 | {
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| 48 | typedef State state;
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| 49 | typedef Iterator iterator;
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| 50 | };
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| 51 |
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| 52 | template< bool >
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| 53 | struct iter_fold_if_step_impl
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| 54 | {
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| 55 | template<
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| 56 | typename Iterator
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| 57 | , typename State
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| 58 | , typename StateOp
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| 59 | , typename IteratorOp
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| 60 | >
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| 61 | struct result_
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| 62 | {
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| 63 | typedef typename apply2<StateOp,State,Iterator>::type state;
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| 64 | typedef typename IteratorOp::type iterator;
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| 65 | };
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| 66 | };
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| 67 |
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| 68 | template<>
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| 69 | struct iter_fold_if_step_impl<false>
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| 70 | {
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| 71 | template<
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| 72 | typename Iterator
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| 73 | , typename State
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| 74 | , typename StateOp
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| 75 | , typename IteratorOp
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| 76 | >
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| 77 | struct result_
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| 78 | {
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| 79 | typedef State state;
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| 80 | typedef Iterator iterator;
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| 81 | };
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| 82 | };
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| 83 |
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| 84 | // agurt, 25/jun/02: MSVC 6.5 workaround, had to get rid of inheritance
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| 85 | // here and in 'iter_fold_if_backward_step', because sometimes it interfered
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| 86 | // with the "early template instantiation bug" in _really_ ugly ways
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| 87 | template<
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| 88 | typename Iterator
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| 89 | , typename State
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| 90 | , typename ForwardOp
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| 91 | , typename Predicate
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| 92 | >
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| 93 | struct iter_fold_if_forward_step
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| 94 | {
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| 95 | typedef typename apply2<Predicate,State,Iterator>::type not_last;
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| 96 | typedef typename iter_fold_if_step_impl<
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| 97 | BOOST_MPL_AUX_MSVC_VALUE_WKND(not_last)::value
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| 98 | >::template result_< Iterator,State,ForwardOp,mpl::next<Iterator> > impl_;
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| 99 |
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| 100 | typedef typename impl_::state state;
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| 101 | typedef typename impl_::iterator iterator;
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| 102 | };
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| 103 |
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| 104 | template<
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| 105 | typename Iterator
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| 106 | , typename State
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| 107 | , typename BackwardOp
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| 108 | , typename Predicate
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| 109 | >
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| 110 | struct iter_fold_if_backward_step
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| 111 | {
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| 112 | typedef typename apply2<Predicate,State,Iterator>::type not_last;
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| 113 | typedef typename iter_fold_if_step_impl<
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| 114 | BOOST_MPL_AUX_MSVC_VALUE_WKND(not_last)::value
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| 115 | >::template result_< Iterator,State,BackwardOp,identity<Iterator> > impl_;
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| 116 |
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| 117 | typedef typename impl_::state state;
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| 118 | typedef typename impl_::iterator iterator;
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| 119 | };
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| 120 |
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| 121 |
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| 122 | // local macros, #undef-ined at the end of the header
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| 123 |
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| 124 | # define AUX_ITER_FOLD_FORWARD_STEP(unused, i, unused2) \
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| 125 | typedef iter_fold_if_forward_step< \
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| 126 | typename BOOST_PP_CAT(forward_step,i)::iterator \
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| 127 | , typename BOOST_PP_CAT(forward_step,i)::state \
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| 128 | , ForwardOp \
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| 129 | , ForwardPredicate \
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| 130 | > BOOST_PP_CAT(forward_step, BOOST_PP_INC(i)); \
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| 131 | /**/
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| 132 |
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| 133 | # define AUX_ITER_FOLD_BACKWARD_STEP_FUNC(i) \
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| 134 | typedef iter_fold_if_backward_step< \
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| 135 | typename BOOST_PP_CAT(forward_step,BOOST_PP_DEC(i))::iterator \
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| 136 | , typename BOOST_PP_CAT(backward_step,i)::state \
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| 137 | , BackwardOp \
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| 138 | , BackwardPredicate \
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| 139 | > BOOST_PP_CAT(backward_step,BOOST_PP_DEC(i)); \
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| 140 | /**/
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| 141 |
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| 142 | # define AUX_ITER_FOLD_BACKWARD_STEP(unused, i, unused2) \
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| 143 | AUX_ITER_FOLD_BACKWARD_STEP_FUNC( \
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| 144 | BOOST_PP_SUB_D(1,BOOST_MPL_LIMIT_UNROLLING,i) \
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| 145 | ) \
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| 146 | /**/
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| 147 |
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| 148 | # define AUX_LAST_FORWARD_STEP \
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| 149 | BOOST_PP_CAT(forward_step, BOOST_MPL_LIMIT_UNROLLING) \
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| 150 | /**/
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| 151 |
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| 152 | # define AUX_LAST_BACKWARD_STEP \
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| 153 | BOOST_PP_CAT(backward_step, BOOST_MPL_LIMIT_UNROLLING) \
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| 154 | /**/
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| 155 |
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| 156 | template<
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| 157 | typename Iterator
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| 158 | , typename State
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| 159 | , typename ForwardOp
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| 160 | , typename ForwardPredicate
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| 161 | , typename BackwardOp
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| 162 | , typename BackwardPredicate
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| 163 | >
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| 164 | struct iter_fold_if_impl
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| 165 | {
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| 166 | private:
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| 167 | typedef iter_fold_if_null_step<Iterator,State> forward_step0;
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| 168 | BOOST_PP_REPEAT(
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| 169 | BOOST_MPL_LIMIT_UNROLLING
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| 170 | , AUX_ITER_FOLD_FORWARD_STEP
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| 171 | , unused
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| 172 | )
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| 173 |
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| 174 | typedef typename if_<
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| 175 | typename AUX_LAST_FORWARD_STEP::not_last
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| 176 | , iter_fold_if_impl<
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| 177 | typename AUX_LAST_FORWARD_STEP::iterator
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| 178 | , typename AUX_LAST_FORWARD_STEP::state
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| 179 | , ForwardOp
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| 180 | , ForwardPredicate
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| 181 | , BackwardOp
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| 182 | , BackwardPredicate
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| 183 | >
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| 184 | , iter_fold_if_null_step<
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| 185 | typename AUX_LAST_FORWARD_STEP::iterator
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| 186 | , typename AUX_LAST_FORWARD_STEP::state
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| 187 | >
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| 188 | >::type AUX_LAST_BACKWARD_STEP;
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| 189 |
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| 190 | BOOST_PP_REPEAT(
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| 191 | BOOST_MPL_LIMIT_UNROLLING
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| 192 | , AUX_ITER_FOLD_BACKWARD_STEP
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| 193 | , unused
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| 194 | )
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| 195 |
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| 196 | public:
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| 197 | typedef typename backward_step0::state state;
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| 198 | typedef typename AUX_LAST_BACKWARD_STEP::iterator iterator;
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| 199 | };
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| 200 |
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| 201 | # undef AUX_LAST_BACKWARD_STEP
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| 202 | # undef AUX_LAST_FORWARD_STEP
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| 203 | # undef AUX_ITER_FOLD_BACKWARD_STEP
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| 204 | # undef AUX_ITER_FOLD_BACKWARD_STEP_FUNC
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| 205 | # undef AUX_ITER_FOLD_FORWARD_STEP
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| 206 |
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| 207 | }}}
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| 208 |
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| 209 | #endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
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| 210 | #endif // BOOST_MPL_AUX_ITER_FOLD_IF_IMPL_HPP_INCLUDED
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