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 | // $Id: fold_impl_body.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 | # 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/workaround.hpp> |
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21 | # include <boost/mpl/aux_/config/ctps.hpp> |
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22 | # include <boost/mpl/aux_/nttp_decl.hpp> |
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23 | # include <boost/mpl/aux_/config/eti.hpp> |
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24 | |
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25 | # include <boost/preprocessor/iterate.hpp> |
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26 | # include <boost/preprocessor/dec.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_STEP(unused, i, unused2) \ |
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32 | typedef typename apply2< \ |
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33 | ForwardOp \ |
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34 | , BOOST_PP_CAT(state,i) \ |
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35 | , AUX778076_FOLD_IMPL_OP(BOOST_PP_CAT(iter,i)) \ |
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36 | >::type BOOST_PP_CAT(state,BOOST_PP_INC(i)); \ |
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37 | typedef typename mpl::next<BOOST_PP_CAT(iter,i)>::type \ |
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38 | BOOST_PP_CAT(iter,BOOST_PP_INC(i)); \ |
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39 | /**/ |
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40 | |
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41 | # define AUX778076_FOLD_IMPL_NAME \ |
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42 | BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_impl) \ |
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43 | /**/ |
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44 | |
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45 | # define AUX778076_FOLD_CHUNK_NAME \ |
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46 | BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_chunk) \ |
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47 | /**/ |
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48 | |
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49 | namespace boost { namespace mpl { namespace aux { |
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50 | |
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51 | /// forward declaration |
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52 | template< |
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53 | BOOST_MPL_AUX_NTTP_DECL(int, N) |
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54 | , typename First |
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55 | , typename Last |
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56 | , typename State |
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57 | , typename ForwardOp |
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58 | > |
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59 | struct AUX778076_FOLD_IMPL_NAME; |
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60 | |
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61 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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62 | |
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63 | # if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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64 | |
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65 | # define BOOST_PP_ITERATION_PARAMS_1 \ |
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66 | (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/fold_impl_body.hpp>)) |
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67 | # include BOOST_PP_ITERATE() |
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68 | |
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69 | // implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING |
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70 | template< |
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71 | BOOST_MPL_AUX_NTTP_DECL(int, 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 ForwardOp |
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76 | > |
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77 | struct AUX778076_FOLD_IMPL_NAME |
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78 | { |
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79 | typedef AUX778076_FOLD_IMPL_NAME< |
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80 | BOOST_MPL_LIMIT_UNROLLING |
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81 | , First |
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82 | , Last |
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83 | , State |
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84 | , ForwardOp |
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85 | > chunk_; |
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86 | |
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87 | typedef AUX778076_FOLD_IMPL_NAME< |
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88 | ( (N - BOOST_MPL_LIMIT_UNROLLING) < 0 ? 0 : N - BOOST_MPL_LIMIT_UNROLLING ) |
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89 | , typename chunk_::iterator |
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90 | , Last |
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91 | , typename chunk_::state |
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92 | , ForwardOp |
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93 | > res_; |
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94 | |
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95 | typedef typename res_::state state; |
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96 | typedef typename res_::iterator iterator; |
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97 | }; |
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98 | |
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99 | // fallback implementation for sequences of unknown size |
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100 | template< |
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101 | typename First |
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102 | , typename Last |
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103 | , typename State |
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104 | , typename ForwardOp |
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105 | > |
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106 | struct AUX778076_FOLD_IMPL_NAME<-1,First,Last,State,ForwardOp> |
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107 | : AUX778076_FOLD_IMPL_NAME< |
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108 | -1 |
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109 | , typename mpl::next<First>::type |
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110 | , Last |
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111 | , typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type |
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112 | , ForwardOp |
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113 | > |
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114 | { |
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115 | }; |
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116 | |
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117 | template< |
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118 | typename Last |
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119 | , typename State |
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120 | , typename ForwardOp |
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121 | > |
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122 | struct AUX778076_FOLD_IMPL_NAME<-1,Last,Last,State,ForwardOp> |
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123 | { |
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124 | typedef State state; |
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125 | typedef Last iterator; |
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126 | }; |
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127 | |
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128 | # else // BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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129 | |
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130 | // Borland have some serious problems with the unrolled version, so |
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131 | // we always use a basic implementation |
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132 | template< |
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133 | BOOST_MPL_AUX_NTTP_DECL(int, N) |
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134 | , typename First |
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135 | , typename Last |
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136 | , typename State |
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137 | , typename ForwardOp |
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138 | > |
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139 | struct AUX778076_FOLD_IMPL_NAME |
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140 | { |
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141 | typedef AUX778076_FOLD_IMPL_NAME< |
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142 | -1 |
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143 | , typename mpl::next<First>::type |
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144 | , Last |
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145 | , typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type |
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146 | , ForwardOp |
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147 | > res_; |
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148 | |
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149 | typedef typename res_::state state; |
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150 | typedef typename res_::iterator iterator; |
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151 | typedef state type; |
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152 | }; |
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153 | |
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154 | template< |
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155 | BOOST_MPL_AUX_NTTP_DECL(int, N) |
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156 | , typename Last |
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157 | , typename State |
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158 | , typename ForwardOp |
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159 | > |
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160 | struct AUX778076_FOLD_IMPL_NAME<N,Last,Last,State,ForwardOp > |
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161 | { |
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162 | typedef State state; |
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163 | typedef Last iterator; |
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164 | typedef state type; |
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165 | }; |
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166 | |
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167 | # endif // BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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168 | |
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169 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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170 | |
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171 | template< BOOST_MPL_AUX_NTTP_DECL(int, N) > |
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172 | struct AUX778076_FOLD_CHUNK_NAME; |
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173 | |
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174 | # define BOOST_PP_ITERATION_PARAMS_1 \ |
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175 | (3,(0, BOOST_MPL_LIMIT_UNROLLING, <boost/mpl/aux_/fold_impl_body.hpp>)) |
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176 | # include BOOST_PP_ITERATE() |
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177 | |
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178 | // implementation for N that exceeds BOOST_MPL_LIMIT_UNROLLING |
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179 | template< BOOST_MPL_AUX_NTTP_DECL(int, N) > |
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180 | struct AUX778076_FOLD_CHUNK_NAME |
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181 | { |
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182 | template< |
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183 | typename First |
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184 | , typename Last |
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185 | , typename State |
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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 AUX778076_FOLD_IMPL_NAME< |
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191 | BOOST_MPL_LIMIT_UNROLLING |
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192 | , First |
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193 | , Last |
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194 | , State |
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195 | , ForwardOp |
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196 | > chunk_; |
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197 | |
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198 | typedef AUX778076_FOLD_IMPL_NAME< |
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199 | ( (N - BOOST_MPL_LIMIT_UNROLLING) < 0 ? 0 : N - BOOST_MPL_LIMIT_UNROLLING ) |
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200 | , typename chunk_::iterator |
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201 | , Last |
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202 | , typename chunk_::state |
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203 | , ForwardOp |
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204 | > res_; |
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205 | |
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206 | typedef typename res_::state state; |
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207 | typedef typename res_::iterator iterator; |
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208 | }; |
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209 | }; |
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210 | |
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211 | // fallback implementation for sequences of unknown size |
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212 | template< |
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213 | typename First |
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214 | , typename Last |
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215 | , typename State |
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216 | , typename ForwardOp |
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217 | > |
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218 | struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step); |
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219 | |
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220 | template< |
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221 | typename Last |
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222 | , typename State |
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223 | > |
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224 | struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_null_step) |
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225 | { |
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226 | typedef Last iterator; |
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227 | typedef State state; |
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228 | }; |
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229 | |
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230 | template<> |
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231 | struct AUX778076_FOLD_CHUNK_NAME<-1> |
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232 | { |
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233 | template< |
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234 | typename First |
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235 | , typename Last |
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236 | , typename State |
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237 | , typename ForwardOp |
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238 | > |
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239 | struct result_ |
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240 | { |
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241 | typedef typename if_< |
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242 | typename is_same<First,Last>::type |
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243 | , BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_null_step)<Last,State> |
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244 | , BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step)<First,Last,State,ForwardOp> |
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245 | >::type res_; |
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246 | |
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247 | typedef typename res_::state state; |
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248 | typedef typename res_::iterator iterator; |
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249 | }; |
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250 | |
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251 | #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG) |
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252 | /// ETI workaround |
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253 | template<> struct result_<int,int,int,int> |
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254 | { |
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255 | typedef int state; |
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256 | typedef int iterator; |
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257 | }; |
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258 | #endif |
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259 | }; |
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260 | |
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261 | template< |
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262 | typename First |
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263 | , typename Last |
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264 | , typename State |
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265 | , typename ForwardOp |
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266 | > |
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267 | struct BOOST_PP_CAT(AUX778076_FOLD_IMPL_NAME_PREFIX,_step) |
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268 | { |
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269 | // can't inherit here - it breaks MSVC 7.0 |
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270 | typedef AUX778076_FOLD_CHUNK_NAME<-1>::template result_< |
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271 | typename mpl::next<First>::type |
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272 | , Last |
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273 | , typename apply2<ForwardOp,State,AUX778076_FOLD_IMPL_OP(First)>::type |
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274 | , ForwardOp |
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275 | > chunk_; |
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276 | |
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277 | typedef typename chunk_::state state; |
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278 | typedef typename chunk_::iterator iterator; |
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279 | }; |
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280 | |
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281 | template< |
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282 | BOOST_MPL_AUX_NTTP_DECL(int, N) |
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283 | , typename First |
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284 | , typename Last |
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285 | , typename State |
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286 | , typename ForwardOp |
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287 | > |
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288 | struct AUX778076_FOLD_IMPL_NAME |
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289 | : AUX778076_FOLD_CHUNK_NAME<N> |
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290 | ::template result_<First,Last,State,ForwardOp> |
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291 | { |
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292 | }; |
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293 | |
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294 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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295 | |
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296 | }}} |
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297 | |
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298 | # undef AUX778076_FOLD_IMPL_NAME |
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299 | # undef AUX778076_FOLD_CHUNK_NAME |
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300 | # undef AUX778076_ITER_FOLD_STEP |
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301 | |
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302 | #undef AUX778076_FOLD_IMPL_OP |
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303 | #undef AUX778076_FOLD_IMPL_NAME_PREFIX |
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304 | |
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305 | ///// iteration |
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306 | |
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307 | #else |
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308 | |
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309 | # define n_ BOOST_PP_FRAME_ITERATION(1) |
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310 | |
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311 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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312 | |
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313 | template< |
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314 | typename First |
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315 | , typename Last |
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316 | , typename State |
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317 | , typename ForwardOp |
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318 | > |
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319 | struct AUX778076_FOLD_IMPL_NAME<n_,First,Last,State,ForwardOp> |
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320 | { |
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321 | typedef First iter0; |
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322 | typedef State state0; |
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323 | |
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324 | BOOST_MPL_PP_REPEAT(n_, AUX778076_ITER_FOLD_STEP, unused) |
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325 | |
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326 | typedef BOOST_PP_CAT(state,n_) state; |
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327 | typedef BOOST_PP_CAT(iter,n_) iterator; |
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328 | }; |
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329 | |
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330 | #else |
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331 | |
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332 | template<> struct AUX778076_FOLD_CHUNK_NAME<n_> |
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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 ForwardOp |
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339 | > |
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340 | struct result_ |
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341 | { |
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342 | typedef First iter0; |
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343 | typedef State state0; |
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344 | |
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345 | BOOST_MPL_PP_REPEAT(n_, AUX778076_ITER_FOLD_STEP, unused) |
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346 | |
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347 | typedef BOOST_PP_CAT(state,n_) state; |
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348 | typedef BOOST_PP_CAT(iter,n_) iterator; |
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349 | }; |
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350 | |
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351 | #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG) |
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352 | /// ETI workaround |
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353 | template<> struct result_<int,int,int,int> |
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354 | { |
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355 | typedef int state; |
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356 | typedef int iterator; |
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357 | }; |
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358 | #endif |
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359 | }; |
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360 | |
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361 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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362 | |
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363 | # undef n_ |
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364 | |
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365 | #endif // BOOST_PP_IS_ITERATING |
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