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7 | <title>The MPL Reference Manual: reverse_iter_fold</title> |
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12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./iteration-algorithms.html" class="navigation-link">Iteration Algorithms</a> / <a href="./reverse-iter-fold.html" class="navigation-link">reverse_iter_fold</a></td> |
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13 | </tr></table><div class="header-separator"></div> |
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14 | <div class="section" id="reverse-iter-fold"> |
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15 | <h1><a class="toc-backref" href="./iteration-algorithms.html#id400" name="reverse-iter-fold">reverse_iter_fold</a></h1> |
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16 | <div class="section" id="iteration-reverse-synopsis"> |
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17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
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18 | <pre class="literal-block"> |
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19 | template< |
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20 | typename Sequence |
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21 | , typename State |
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22 | , typename BackwardOp |
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23 | , typename ForwardOp = _1 |
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24 | > |
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25 | struct <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a> |
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26 | { |
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27 | typedef <em>unspecified</em> type; |
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28 | }; |
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29 | </pre> |
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30 | </div> |
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31 | <div class="section" id="iteration-reverse-description"> |
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32 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
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33 | <p>Returns the result of the successive application of binary <tt class="literal"><span class="pre">BackwardOp</span></tt> to the |
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34 | result of the previous <tt class="literal"><span class="pre">BackwardOp</span></tt> invocation (<tt class="literal"><span class="pre">State</span></tt> if it's the first call) |
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35 | and each iterator in the range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Sequence>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Sequence>::type</span></tt>) |
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36 | in reverse order. If <tt class="literal"><span class="pre">ForwardOp</span></tt> is provided, then it's applied on forward |
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37 | traversal to form the result which is passed to the first <tt class="literal"><span class="pre">BackwardOp</span></tt> call.</p> |
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38 | </div> |
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39 | <div class="section" id="iteration-reverse-header"> |
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40 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
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41 | <pre class="literal-block"> |
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42 | #include <<a href="../../../../boost/mpl/reverse_iter_fold.hpp" class="header">boost/mpl/reverse_iter_fold.hpp</a>> |
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43 | </pre> |
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44 | </div> |
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45 | <div class="section" id="algorithms-iteration-reverse-parameters"> |
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46 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
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47 | <table border="1" class="table"> |
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48 | <colgroup> |
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49 | <col width="16%" /> |
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50 | <col width="33%" /> |
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51 | <col width="51%" /> |
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52 | </colgroup> |
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53 | <thead valign="bottom"> |
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54 | <tr><th>Parameter</th> |
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55 | <th>Requirement</th> |
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56 | <th>Description</th> |
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57 | </tr> |
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58 | </thead> |
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59 | <tbody valign="top"> |
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60 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> |
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61 | <td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td> |
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62 | <td>A sequence to iterate.</td> |
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63 | </tr> |
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64 | <tr><td><tt class="literal"><span class="pre">State</span></tt></td> |
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65 | <td>Any type</td> |
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66 | <td>The initial state for the first <tt class="literal"><span class="pre">BackwardOp</span></tt> |
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67 | / <tt class="literal"><span class="pre">ForwardOp</span></tt> application.</td> |
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68 | </tr> |
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69 | <tr><td><tt class="literal"><span class="pre">BackwardOp</span></tt></td> |
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70 | <td>Binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td> |
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71 | <td>The operation to be executed on backward |
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72 | traversal.</td> |
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73 | </tr> |
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74 | <tr><td><tt class="literal"><span class="pre">ForwardOp</span></tt></td> |
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75 | <td>Binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td> |
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76 | <td>The operation to be executed on forward |
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77 | traversal.</td> |
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78 | </tr> |
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79 | </tbody> |
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80 | </table> |
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81 | </div> |
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82 | <div class="section" id="iteration-reverse-expression-semantics"> |
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83 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
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84 | <p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">backward_op</span></tt> and <tt class="literal"><span class="pre">forward_op</span></tt>, |
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85 | and arbitrary type <tt class="literal"><span class="pre">state</span></tt>:</p> |
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86 | <pre class="literal-block"> |
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87 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< s,state,backward_op >::type t; |
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88 | </pre> |
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89 | <table class="field-list" frame="void" rules="none"> |
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90 | <col class="field-name" /> |
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91 | <col class="field-body" /> |
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92 | <tbody valign="top"> |
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93 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td> |
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94 | </tr> |
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95 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
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96 | <pre class="literal-block"> |
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97 | typedef <a href="./begin.html" class="identifier">begin</a><s>::type i<sub>1</sub>; |
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98 | typedef <a href="./next.html" class="identifier">next</a><i<sub>1</sub>>::type i<sub>2</sub>; |
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99 | <em>...</em> |
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100 | typedef <a href="./next.html" class="identifier">next</a><i<sub>n</sub>>::type last; |
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101 | typedef <a href="./apply.html" class="identifier">apply</a><backward_op,state,i<sub>n</sub>>::type state<sub>n</sub>; |
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102 | typedef <a href="./apply.html" class="identifier">apply</a><backward_op,state<sub>n</sub>,i<sub>n-1</sub>>::type state<sub>n-1</sub>; |
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103 | <em>...</em> |
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104 | typedef <a href="./apply.html" class="identifier">apply</a><backward_op,state<sub>2</sub>,i<sub>1</sub>>::type state<sub>1</sub>; |
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105 | typedef state<sub>1</sub> t; |
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106 | </pre> |
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107 | <p class="last">where <tt class="literal"><span class="pre">n</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> and <tt class="literal"><span class="pre">last</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>; equivalent |
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108 | to <tt class="literal"><span class="pre">typedef</span> <span class="pre">state</span> <span class="pre">t;</span></tt> if <tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a><s>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</p> |
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109 | </td> |
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110 | </tr> |
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111 | </tbody> |
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112 | </table> |
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113 | <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --> |
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114 | <pre class="literal-block"> |
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115 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< s,state,backward_op,forward_op >::type t; |
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116 | </pre> |
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117 | <table class="field-list" frame="void" rules="none"> |
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118 | <col class="field-name" /> |
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119 | <col class="field-body" /> |
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120 | <tbody valign="top"> |
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121 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td> |
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122 | </tr> |
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123 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
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124 | <pre class="last literal-block"> |
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125 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< |
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126 | Sequence |
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127 | , <a href="./iter-fold.html" class="identifier">iter_fold</a><s,state,forward_op>::type |
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128 | , backward_op |
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129 | >::type t; |
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130 | </pre> |
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131 | </td> |
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132 | </tr> |
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133 | </tbody> |
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134 | </table> |
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135 | </div> |
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136 | <div class="section" id="iteration-reverse-complexity"> |
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137 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
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138 | <p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> applications of <tt class="literal"><span class="pre">backward_op</span></tt> and <tt class="literal"><span class="pre">forward_op</span></tt>.</p> |
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139 | </div> |
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140 | <div class="section" id="iteration-reverse-example"> |
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141 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
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142 | <p>Build a list of iterators to the negative elements in a sequence.</p> |
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143 | <pre class="literal-block"> |
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144 | typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,5,-1,0,-7,-2,0,-5,4> numbers; |
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145 | typedef <a href="./list-c.html" class="identifier">list_c</a><int,-1,-7,-2,-5> negatives; |
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146 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< |
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147 | numbers |
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148 | , <a href="./list.html" class="identifier">list</a><> |
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149 | , <a href="./if.html" class="identifier">if_</a>< <a href="./less.html" class="identifier">less</a>< <a href="./deref.html" class="identifier">deref</a><_2>,<a href="./int.html" class="identifier">int_</a><0> >, <a href="./push-front.html" class="identifier">push_front</a><_1,_2>, _1 > |
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150 | >::type iters; |
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151 | |
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152 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< |
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153 | negatives |
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154 | , <a href="./transform-view.html" class="identifier">transform_view</a>< iters,<a href="./deref.html" class="identifier">deref</a><_1> > |
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155 | > )); |
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156 | </pre> |
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157 | </div> |
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158 | <div class="section" id="iteration-reverse-see-also"> |
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159 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
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160 | <p><a class="reference" href="./algorithms.html">Algorithms</a>, <a class="refentry reference" href="./iter-fold.html"><tt class="refentry literal"><span class="pre">iter_fold</span></tt></a>, <a class="refentry reference" href="./reverse-fold.html"><tt class="refentry literal"><span class="pre">reverse_fold</span></tt></a>, <a class="refentry reference" href="./fold.html"><tt class="refentry literal"><span class="pre">fold</span></tt></a></p> |
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161 | <!-- modtime: November 13, 2004 02:51:20 +0000 --> |
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162 | <!-- Algorithms/Iteration Algorithms//accumulate |10 --> |
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