1 | |
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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 | // $Id: iter_fold_if_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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15 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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16 | // $Revision: 49267 $ |
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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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