ceph/src/boost/libs/mpl/doc/refmanual/transform.html

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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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  14 <div class="section" id="transform">
  15 <h1><a class="toc-backref" href="./transformation-algorithms.html#id1488">transform</a></h1>
  16 <div class="section" id="id633">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename Sequence
  21     , typename Op
  22     , typename In = <em>unspecified</em>
  23     &gt;
  24 struct <a href="./transform.html" class="identifier">transform</a>
  25 {
  26     typedef <em>unspecified</em> type;
  27 };
  28
  29 template&lt;
  30       typename Seq1
  31     , typename Seq2
  32     , typename BinaryOp
  33     , typename In = <em>unspecified</em>
  34     &gt;
  35 struct <a href="./transform.html" class="identifier">transform</a>
  36 {
  37     typedef <em>unspecified</em> type;
  38 };
  39 </pre>
  40 </div>
  41 <div class="section" id="id634">
  42 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  43 <p><tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a></span></tt> is an <a class="reference internal" href="./terminology.html#overloaded-name">overloaded name</a>:</p>
  44 <ul class="simple">
  45 <li><tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a>&lt;Sequence,Op&gt;</span></tt> returns a transformed copy of the original sequence
  46 produced by applying an unary transformation <tt class="literal"><span class="pre">Op</span></tt> to every element
  47 in the [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;Sequence&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Sequence&gt;::type</span></tt>) range.</li>
  48 <li><tt class="literal"><span class="pre"><a href="./transform.html" class="identifier">transform</a>&lt;Seq1,Seq2,BinaryOp&gt;</span></tt> returns a new sequence produced by applying a
  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>)
  50 from the corresponding [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;Seq1&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Seq1&gt;::type</span></tt>) and [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;Seq2&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Seq2&gt;::type</span></tt>) ranges.</li>
  51 </ul>
  52 <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
  53 <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
  54 details in all cases — <em>end note</em>]</p>
  55 </div>
  56 <div class="section" id="id635">
  57 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  58 <pre class="literal-block">
  59 #include &lt;<a href="../../../../boost/mpl/transform.hpp" class="header">boost/mpl/transform.hpp</a>&gt;
  60 </pre>
  61 </div>
  62 <div class="section" id="id636">
  63 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  64 <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
  65 </div>
  66 <div class="section" id="id637">
  67 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  68 <table border="1" class="docutils table">
  69 <colgroup>
  70 <col width="21%" />
  71 <col width="39%" />
  72 <col width="39%" />
  73 </colgroup>
  74 <thead valign="bottom">
  75 <tr><th class="head">Parameter</th>
  76 <th class="head">Requirement</th>
  77 <th class="head">Description</th>
  78 </tr>
  79 </thead>
  80 <tbody valign="top">
  81 <tr><td><tt class="literal"><span class="pre">Sequence</span></tt>,
  82 <tt class="literal"><span class="pre">Seq1</span></tt>, <tt class="literal"><span class="pre">Seq2</span></tt></td>
  83 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  84 <td>Sequences to transform.</td>
  85 </tr>
  86 <tr><td><tt class="literal"><span class="pre">Op</span></tt>,
  87 <tt class="literal"><span class="pre">BinaryOp</span></tt></td>
  88 <td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
  89 <td>A transformation.</td>
  90 </tr>
  91 <tr><td><tt class="literal"><span class="pre">In</span></tt></td>
  92 <td><a class="reference internal" href="./inserter.html">Inserter</a></td>
  93 <td>An inserter.</td>
  94 </tr>
  95 </tbody>
  96 </table>
  97 </div>
  98 <div class="section" id="id638">
  99 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
 100 <p>The semantics of an expression are defined only
 101 where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
 102 <p>For any <a class="reference internal" 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 internal" 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>,
 103 and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p>
 104 <pre class="literal-block">
 105 typedef <a href="./transform.html" class="identifier">transform</a>&lt;s,op,in&gt;::type r;
 106 </pre>
 107 <table class="docutils field-list" frame="void" rules="none">
 108 <col class="field-name" />
 109 <col class="field-body" />
 110 <tbody valign="top">
 111 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
 112 </td>
 113 </tr>
 114 <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
 115 <pre class="last literal-block">
 116 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;op&gt;::type f;
 117 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type in_op;
 118
 119 typedef <a href="./fold.html" class="identifier">fold</a>&lt;
 120       s
 121     , in::state
 122     , <a href="./bind.html" class="identifier">bind</a>&lt; in_op, <a href="./placeholders.html" class="identifier">_1</a>, <a href="./bind.html" class="identifier">bind</a>&lt;f, <a href="./placeholders.html" class="identifier">_2</a>&gt; &gt;
 123     &gt;::type r;
 124 </pre>
 125 </td>
 126 </tr>
 127 </tbody>
 128 </table>
 129 <pre class="literal-block">
 130 typedef <a href="./transform.html" class="identifier">transform</a>&lt;s1,s2,op,in&gt;::type r;
 131 </pre>
 132 <table class="docutils field-list" frame="void" rules="none">
 133 <col class="field-name" />
 134 <col class="field-body" />
 135 <tbody valign="top">
 136 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
 137 </td>
 138 </tr>
 139 <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
 140 <pre class="last literal-block">
 141 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;op2&gt;::type f;
 142 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type in_op;
 143
 144 typedef <a href="./fold.html" class="identifier">fold</a>&lt;
 145       pair_view&lt;s1,s2&gt;
 146     , in::state
 147     , <a href="./bind.html" class="identifier">bind</a>&lt;
 148           in_op
 149         , <a href="./placeholders.html" class="identifier">_1</a>
 150         , <a href="./bind.html" class="identifier">bind</a>&lt;f, <a href="./bind.html" class="identifier">bind</a>&lt;first&lt;&gt;,<a href="./placeholders.html" class="identifier">_2</a>&gt;, <a href="./bind.html" class="identifier">bind</a>&lt;second&lt;&gt;,<a href="./placeholders.html" class="identifier">_2</a>&gt; &gt;
 151         &gt;
 152     &gt;::type r;
 153 </pre>
 154 </td>
 155 </tr>
 156 </tbody>
 157 </table>
 158 </div>
 159 <div class="section" id="id639">
 160 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
 161 <p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> / <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s1&gt;::value</span></tt> applications of
 162 <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>
 163 </div>
 164 <div class="section" id="id640">
 165 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 166 <pre class="literal-block">
 167 typedef <a href="./vector.html" class="identifier">vector</a>&lt;char,short,int,long,float,double&gt; types;
 168 typedef <a href="./vector.html" class="identifier">vector</a>&lt;char*,short*,int*,long*,float*,double*&gt; pointers;
 169 typedef <a href="./transform.html" class="identifier">transform</a>&lt; types,boost::add_pointer&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt; &gt;::type result;
 170
 171 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt;result,pointers&gt; ));
 172 </pre>
 173 </div>
 174 <div class="section" id="id641">
 175 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 176 <p><a class="reference internal" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="reference internal" href="./reverse-transform.html">reverse_transform</a>, <a class="reference internal" href="./copy.html">copy</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p>
 177 <!-- Algorithms/Transformation Algorithms//replace |40 -->
 178 </div>
 179 </div>
 180
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