ceph/src/boost/libs/mpl/doc/refmanual/replace-if.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="./replace-if.html" class="navigation-link">replace_if</a></td>
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  14 <div class="section" id="replace-if">
  15 <h1><a class="toc-backref" href="./transformation-algorithms.html#id1490">replace_if</a></h1>
  16 <div class="section" id="id651">
  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 Pred
  22     , typename NewType
  23     , typename In = <em>unspecified</em>
  24     &gt;
  25 struct <a href="./replace-if.html" class="identifier">replace_if</a>
  26 {
  27     typedef <em>unspecified</em> type;
  28 };
  29 </pre>
  30 </div>
  31 <div class="section" id="id652">
  32 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  33 <p>Returns a copy of the original sequence where every type that satisfies
  34 the predicate <tt class="literal"><span class="pre">Pred</span></tt> has been replaced with <tt class="literal"><span class="pre">NewType</span></tt>.</p>
  35 <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
  36 <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
  37 details in all cases — <em>end note</em>]</p>
  38 </div>
  39 <div class="section" id="id653">
  40 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  41 <pre class="literal-block">
  42 #include &lt;<a href="../../../../boost/mpl/replace_if.hpp" class="header">boost/mpl/replace_if.hpp</a>&gt;
  43 </pre>
  44 </div>
  45 <div class="section" id="id654">
  46 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  47 <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
  48 </div>
  49 <div class="section" id="id655">
  50 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  51 <table border="1" class="docutils table">
  52 <colgroup>
  53 <col width="19%" />
  54 <col width="43%" />
  55 <col width="38%" />
  56 </colgroup>
  57 <thead valign="bottom">
  58 <tr><th class="head">Parameter</th>
  59 <th class="head">Requirement</th>
  60 <th class="head">Description</th>
  61 </tr>
  62 </thead>
  63 <tbody valign="top">
  64 <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
  65 <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
  66 <td>An original sequence.</td>
  67 </tr>
  68 <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
  69 <td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
  70 <td>A replacement condition.</td>
  71 </tr>
  72 <tr><td><tt class="literal"><span class="pre">NewType</span></tt></td>
  73 <td>Any type</td>
  74 <td>A type to replace with.</td>
  75 </tr>
  76 <tr><td><tt class="literal"><span class="pre">In</span></tt></td>
  77 <td><a class="reference internal" href="./inserter.html">Inserter</a></td>
  78 <td>An inserter.</td>
  79 </tr>
  80 </tbody>
  81 </table>
  82 </div>
  83 <div class="section" id="id656">
  84 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  85 <p>The semantics of an expression are defined only
  86 where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
  87 <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, an unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>,
  88 an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>, and arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
  89 <pre class="literal-block">
  90 typedef <a href="./replace-if.html" class="identifier">replace_if</a>&lt;s,pred,x,in&gt;::type r;
  91 </pre>
  92 <table class="docutils field-list" frame="void" rules="none">
  93 <col class="field-name" />
  94 <col class="field-body" />
  95 <tbody valign="top">
  96 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
  97 </td>
  98 </tr>
  99 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
 100 <pre class="last literal-block">
 101 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
 102 typedef <a href="./transform.html" class="identifier">transform</a>&lt; s, <a href="./if.html" class="identifier">if_</a>&lt; apply_wrap1&lt;p,<a href="./placeholders.html" class="identifier">_1</a>&gt;,x,<a href="./placeholders.html" class="identifier">_1</a>&gt;, in &gt;::type r;
 103 </pre>
 104 </td>
 105 </tr>
 106 </tbody>
 107 </table>
 108 </div>
 109 <div class="section" id="id657">
 110 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
 111 <p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and at most
 112 <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
 113 </div>
 114 <div class="section" id="id658">
 115 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 116 <pre class="literal-block">
 117 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,5,2,7,5,3,5&gt; numbers;
 118 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,4,0,2,0,0,3,0&gt; expected;
 119 typedef <a href="./replace-if.html" class="identifier">replace_if</a>&lt; numbers, <a href="./greater.html" class="identifier">greater</a>&lt;_,<a href="./int.html" class="identifier">int_</a>&lt;4&gt; &gt;, <a href="./int.html" class="identifier">int_</a>&lt;0&gt; &gt;::type result;
 120
 121 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,expected, <a href="./equal-to.html" class="identifier">equal_to</a>&lt;_,_&gt; > ));
 122 </pre>
 123 </div>
 124 <div class="section" id="id659">
 125 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 126 <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-replace-if.html">reverse_replace_if</a>, <a class="reference internal" href="./replace.html">replace</a>, <a class="reference internal" href="./remove-if.html">remove_if</a>, <a class="reference internal" href="./transform.html">transform</a></p>
 127 <!-- Algorithms/Transformation Algorithms//remove |60 -->
 128 </div>
 129 </div>
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 133 <td><div class="copyright-footer"><div class="copyright">Copyright ©  2001-2009 Aleksey Gurtovoy and David Abrahams</div>
 134 Distributed under the Boost Software License, Version 1.0. (See accompanying
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