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2 #ifndef BOOST_MPL_TRANSFORM_HPP_INCLUDED
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3 #define BOOST_MPL_TRANSFORM_HPP_INCLUDED
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4
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5 // Copyright Aleksey Gurtovoy 2000-2004
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6 // Copyright David Abrahams 2003-2004
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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 // $Id$
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15 // $Date$
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16 // $Revision$
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17
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18 #include <boost/mpl/fold.hpp>
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19 #include <boost/mpl/reverse_fold.hpp>
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20 #include <boost/mpl/pair_view.hpp>
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21 #include <boost/mpl/is_sequence.hpp>
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22 #include <boost/mpl/eval_if.hpp>
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23 #include <boost/mpl/lambda.hpp>
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24 #include <boost/mpl/bind.hpp>
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25 #include <boost/mpl/or.hpp>
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26 #include <boost/mpl/not.hpp>
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27 #include <boost/mpl/aux_/na.hpp>
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28 #include <boost/mpl/aux_/inserter_algorithm.hpp>
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29
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30 namespace boost { namespace mpl {
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31
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32 namespace aux {
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33
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34 template<
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35 typename Seq
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36 , typename Op
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37 , typename In
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38 >
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39 struct transform1_impl
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40 : fold<
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41 Seq
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42 , typename In::state
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43 , bind2< typename lambda< typename In::operation >::type
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44 , _1
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45 , bind1< typename lambda<Op>::type, _2>
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46 >
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47 >
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48 {
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49 };
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50
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51 template<
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52 typename Seq
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53 , typename Op
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54 , typename In
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55 >
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56 struct reverse_transform1_impl
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57 : reverse_fold<
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58 Seq
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59 , typename In::state
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60 , bind2< typename lambda< typename In::operation >::type
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61 , _1
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62 , bind1< typename lambda<Op>::type, _2>
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63 >
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64 >
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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 typename Seq1
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70 , typename Seq2
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71 , typename Op
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72 , typename In
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73 >
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74 struct transform2_impl
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75 : fold<
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76 pair_view<Seq1,Seq2>
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77 , typename In::state
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78 , bind2< typename lambda< typename In::operation >::type
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79 , _1
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80 , bind2<
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81 typename lambda<Op>::type
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82 , bind1<first<>,_2>
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83 , bind1<second<>,_2>
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84 >
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85 >
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86 >
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87 {
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88 };
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89
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90 template<
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91 typename Seq1
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92 , typename Seq2
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93 , typename Op
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94 , typename In
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95 >
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96 struct reverse_transform2_impl
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97 : reverse_fold<
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98 pair_view<Seq1,Seq2>
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99 , typename In::state
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100 , bind2< typename lambda< typename In::operation >::type
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101 , _1
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102 , bind2< typename lambda< Op >::type
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103 , bind1<first<>,_2>
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104 , bind1<second<>,_2>
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105 >
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106 >
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107 >
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108 {
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109 };
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110
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111 } // namespace aux
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112
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113 BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(3, transform1)
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114 BOOST_MPL_AUX_INSERTER_ALGORITHM_DEF(4, transform2)
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115
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116 #define AUX778076_TRANSFORM_DEF(name) \
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117 template< \
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118 typename BOOST_MPL_AUX_NA_PARAM(Seq1) \
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119 , typename BOOST_MPL_AUX_NA_PARAM(Seq2OrOperation) \
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120 , typename BOOST_MPL_AUX_NA_PARAM(OperationOrInserter) \
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121 , typename BOOST_MPL_AUX_NA_PARAM(Inserter) \
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122 > \
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123 struct name \
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124 { \
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125 typedef typename eval_if< \
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126 or_< \
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127 is_na<OperationOrInserter> \
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128 , is_lambda_expression< Seq2OrOperation > \
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129 , not_< is_sequence<Seq2OrOperation> > \
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130 > \
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131 , name##1<Seq1,Seq2OrOperation,OperationOrInserter> \
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132 , name##2<Seq1,Seq2OrOperation,OperationOrInserter,Inserter> \
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133 >::type type; \
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134 }; \
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135 BOOST_MPL_AUX_NA_SPEC(4, name) \
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136 /**/
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137
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138 AUX778076_TRANSFORM_DEF(transform)
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139 AUX778076_TRANSFORM_DEF(reverse_transform)
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140
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141 #undef AUX778076_TRANSFORM_DEF
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142
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143 }}
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144
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145 #endif // BOOST_MPL_TRANSFORM_HPP_INCLUDED
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