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| 7 | <title>The MPL Reference Manual: transform</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="./transformation-algorithms.html" class="navigation-link">Transformation Algorithms</a> / <a href="./transform.html" class="navigation-link">transform</a></td> |
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| 13 | </tr></table><div class="header-separator"></div> |
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| 14 | <div class="section" id="transform"> |
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| 15 | <h1><a class="toc-backref" href="./transformation-algorithms.html#id416" name="transform">transform</a></h1> |
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| 16 | <div class="section" id="transformation-transform-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 Seq |
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| 21 | , typename Op |
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| 22 | , typename In = <em>unspecified</em> |
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| 23 | > |
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| 24 | struct <a href="./transform.html" class="identifier">transform</a> |
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| 25 | { |
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| 26 | typedef <em>unspecified</em> type; |
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| 27 | }; |
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| 28 | |
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| 29 | template< |
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| 30 | typename Seq1 |
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| 31 | , typename Seq2 |
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| 32 | , typename BinaryOp |
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| 33 | , typename In = <em>unspecified</em> |
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| 34 | > |
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| 35 | struct <a href="./transform.html" class="identifier">transform</a> |
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| 36 | { |
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| 37 | typedef <em>unspecified</em> type; |
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| 38 | }; |
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| 39 | </pre> |
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| 40 | </div> |
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| 41 | <div class="section" id="transformation-transform-description"> |
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| 42 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
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| 43 | <p><tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a></span></tt> is an <a class="reference" href="./terminology.html#overloaded-name">overloaded name</a>:</p> |
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| 44 | <ul class="simple"> |
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| 45 | <li><tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a><Seq,Op></span></tt> returns a transformed copy of the original sequence |
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| 46 | produced by applying an unary transformation <tt class="literal"><span class="pre">Op</span></tt> to every element |
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| 47 | in the [<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>) range.</li> |
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| 48 | <li><tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a><Seq1,Seq2,Op></span></tt> returns a new sequence produced by applying a |
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| 49 | binary transformation <tt class="literal"><span class="pre">BinaryOp</span></tt> to a pair of elements (e<sub>1</sub>, e2<sub>1</sub>) |
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| 50 | from the corresponding [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Seq1>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq1>::type</span></tt>) and [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Seq2>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq2>::type</span></tt>) ranges.</li> |
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| 51 | </ul> |
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| 52 | <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the |
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| 53 | <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's |
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| 54 | details in all cases — <em>end note</em>]</p> |
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| 55 | </div> |
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| 56 | <div class="section" id="transformation-transform-header"> |
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| 57 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
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| 58 | <pre class="literal-block"> |
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| 59 | #include <<a href="../../../../boost/mpl/transform.hpp" class="header">boost/mpl/transform.hpp</a>> |
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| 60 | </pre> |
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| 61 | </div> |
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| 62 | <div class="section" id="transformation-transform-model-of"> |
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| 63 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
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| 64 | <p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p> |
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| 65 | </div> |
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| 66 | <div class="section" id="transformation-transform-parameters"> |
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| 67 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
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| 68 | <table border="1" class="table"> |
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| 69 | <colgroup> |
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| 70 | <col width="21%" /> |
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| 71 | <col width="39%" /> |
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| 72 | <col width="39%" /> |
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| 73 | </colgroup> |
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| 74 | <thead valign="bottom"> |
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| 75 | <tr><th>Parameter</th> |
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| 76 | <th>Requirement</th> |
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| 77 | <th>Description</th> |
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| 78 | </tr> |
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| 79 | </thead> |
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| 80 | <tbody valign="top"> |
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| 81 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt>, |
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| 82 | <tt class="literal"><span class="pre">Seq1</span></tt>, <tt class="literal"><span class="pre">Seq2</span></tt></td> |
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| 83 | <td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td> |
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| 84 | <td>Sequences to transform.</td> |
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| 85 | </tr> |
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| 86 | <tr><td><tt class="literal"><span class="pre">Op</span></tt>, |
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| 87 | <tt class="literal"><span class="pre">BinaryOp</span></tt></td> |
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| 88 | <td><a class="reference" href="./lambda-expression.html">Lambda Expression</a></td> |
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| 89 | <td>A transformation.</td> |
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| 90 | </tr> |
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| 91 | <tr><td><tt class="literal"><span class="pre">In</span></tt></td> |
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| 92 | <td><a class="reference" href="./inserter.html">Inserter</a></td> |
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| 93 | <td>An inserter.</td> |
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| 94 | </tr> |
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| 95 | </tbody> |
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| 96 | </table> |
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| 97 | </div> |
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| 98 | <div class="section" id="transformation-transform-expression-semantics"> |
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| 99 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
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| 100 | <p>The semantics of an expression are defined only |
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| 101 | where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p> |
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| 102 | <p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a>s <tt class="literal"><span class="pre">s</span></tt>, <tt class="literal"><span class="pre">s1</span></tt> and <tt class="literal"><span class="pre">s2</span></tt>, <a class="reference" href="./lambda-expression.html">Lambda Expression</a>s <tt class="literal"><span class="pre">op</span></tt> and <tt class="literal"><span class="pre">op2</span></tt>, |
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| 103 | and an <a class="reference" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p> |
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| 104 | <pre class="literal-block"> |
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| 105 | typedef <a href="./transform.html" class="identifier">transform</a><s,op,in>::type r; |
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| 106 | </pre> |
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| 107 | <table class="field-list" frame="void" rules="none"> |
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| 108 | <col class="field-name" /> |
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| 109 | <col class="field-body" /> |
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| 110 | <tbody valign="top"> |
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| 111 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td> |
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| 112 | </tr> |
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| 113 | <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p> |
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| 114 | <pre class="last literal-block"> |
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| 115 | typedef <a href="./lambda.html" class="identifier">lambda</a><op>::type f; |
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| 116 | typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op; |
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| 117 | |
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| 118 | typedef <a href="./fold.html" class="identifier">fold</a>< |
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| 119 | s |
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| 120 | , in::state |
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| 121 | , <a href="./bind.html" class="identifier">bind</a>< in_op, _1, <a href="./bind.html" class="identifier">bind</a><f, _2> > |
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| 122 | >::type r; |
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| 123 | </pre> |
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| 124 | </td> |
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| 125 | </tr> |
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| 126 | </tbody> |
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| 127 | </table> |
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| 128 | <pre class="literal-block"> |
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| 129 | typedef <a href="./transform.html" class="identifier">transform</a><s1,s2,op,in>::type r; |
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| 130 | </pre> |
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| 131 | <table class="field-list" frame="void" rules="none"> |
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| 132 | <col class="field-name" /> |
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| 133 | <col class="field-body" /> |
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| 134 | <tbody valign="top"> |
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| 135 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td> |
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| 136 | </tr> |
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| 137 | <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p> |
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| 138 | <pre class="last literal-block"> |
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| 139 | typedef <a href="./lambda.html" class="identifier">lambda</a><op2>::type f; |
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| 140 | typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op; |
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| 141 | |
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| 142 | typedef <a href="./fold.html" class="identifier">fold</a>< |
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| 143 | pair_view<s1,s2> |
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| 144 | , in::state |
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| 145 | , <a href="./bind.html" class="identifier">bind</a>< |
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| 146 | in_op |
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| 147 | , _1 |
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| 148 | , <a href="./bind.html" class="identifier">bind</a><f, <a href="./bind.html" class="identifier">bind</a><first<>,_2>, <a href="./bind.html" class="identifier">bind</a><second<>,_2> > |
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| 149 | > |
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| 150 | >::type r; |
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| 151 | </pre> |
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| 152 | </td> |
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| 153 | </tr> |
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| 154 | </tbody> |
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| 155 | </table> |
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| 156 | </div> |
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| 157 | <div class="section" id="transform-complexity"> |
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| 158 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
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| 159 | <p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> / <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s1>::value</span></tt> applications of |
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| 160 | <tt class="literal"><span class="pre">op</span></tt> / <tt class="literal"><span class="pre">op2</span></tt> and <tt class="literal"><span class="pre">in::operation</span></tt>.</p> |
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| 161 | </div> |
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| 162 | <div class="section" id="transformation-transform-example"> |
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| 163 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
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| 164 | <pre class="literal-block"> |
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| 165 | typedef <a href="./vector.html" class="identifier">vector</a><char,short,int,long,float,double> types; |
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| 166 | typedef <a href="./vector.html" class="identifier">vector</a><char*,short*,int*,long*,float*,double*> pointers; |
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| 167 | typedef <a href="./transform.html" class="identifier">transform</a>< types,boost::add_pointer<_1> >::type result; |
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| 168 | |
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| 169 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a><result,pointers> )); |
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| 170 | </pre> |
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| 171 | </div> |
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| 172 | <div class="section" id="transformation-transform-see-also"> |
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| 173 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
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| 174 | <p><a class="reference" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="refentry reference" href="./reverse-transform.html"><tt class="refentry literal"><span class="pre">reverse_transform</span></tt></a>, <a class="refentry reference" href="./copy.html"><tt class="refentry literal"><span class="pre">copy</span></tt></a>, <a class="refentry reference" href="./replace-if.html"><tt class="refentry literal"><span class="pre">replace_if</span></tt></a></p> |
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| 175 | <!-- modtime: November 10, 2004 04:31:13 +0000 --> |
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| 176 | <!-- Algorithms/Transformation Algorithms//replace |40 --> |
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| 177 | </div> |
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