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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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