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: reverse_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/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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