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

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   7 <title>The MPL Reference Manual: clear</title>
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  12 <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./clear.html" class="navigation-link">clear</a></td>
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  14 <div class="section" id="clear">
  15 <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1429">clear</a></h1>
  16 <div class="section" id="id211">
  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     &gt;
  22 struct <a href="./clear.html" class="identifier">clear</a>
  23 {
  24     typedef <em>unspecified</em> type;
  25 };
  26 </pre>
  27 </div>
  28 <div class="section" id="id212">
  29 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  30 <p>Returns an empty sequence <a class="reference internal" href="./terminology.html#concept-identical">concept-identical</a> to <tt class="literal"><span class="pre">Sequence</span></tt>.</p>
  31 </div>
  32 <div class="section" id="id213">
  33 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  34 <pre class="literal-block">
  35 #include &lt;<a href="../../../../boost/mpl/clear.hpp" class="header">boost/mpl/clear.hpp</a>&gt;
  36 </pre>
  37 </div>
  38 <div class="section" id="id214">
  39 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  40 <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
  41 </div>
  42 <div class="section" id="id215">
  43 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  44 <table border="1" class="docutils table">
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  46 <col width="17%" />
  47 <col width="39%" />
  48 <col width="44%" />
  49 </colgroup>
  50 <thead valign="bottom">
  51 <tr><th class="head">Parameter</th>
  52 <th class="head">Requirement</th>
  53 <th class="head">Description</th>
  54 </tr>
  55 </thead>
  56 <tbody valign="top">
  57 <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
  58 <td><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or
  59 <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
  60 <td>A sequence to get an empty &quot;copy&quot; of.</td>
  61 </tr>
  62 </tbody>
  63 </table>
  64 </div>
  65 <div class="section" id="id216">
  66 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  67 <p>For any <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
  68 <pre class="literal-block">
  69 typedef <a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type t;
  70 </pre>
  71 <table class="docutils field-list" frame="void" rules="none">
  72 <col class="field-name" />
  73 <col class="field-body" />
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  75 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>.</p>
  76 </td>
  77 </tr>
  78 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
  79 <pre class="literal-block">
  80 typedef <a href="./erase.html" class="identifier">erase</a>&lt; s, <a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type, <a href="./end.html" class="identifier">end</a>&lt;s&gt;::type &gt;::type t;
  81 </pre>
  82 </td>
  83 </tr>
  84 <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;s&gt;::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</p>
  85 </td>
  86 </tr>
  87 </tbody>
  88 </table>
  89 </div>
  90 <div class="section" id="id217">
  91 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
  92 <p>Amortized constant time.</p>
  93 </div>
  94 <div class="section" id="id218">
  95 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
  96 <pre class="literal-block">
  97 typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,3,5,7,9,11&gt; odds;
  98 typedef <a href="./clear.html" class="identifier">clear</a>&lt;odds&gt;::type nothing;
  99
 100 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./empty.html" class="identifier">empty</a>&lt;nothing&gt; ));
 101 </pre>
 102 </div>
 103 <div class="section" id="id219">
 104 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 105 <p><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>, <a class="reference internal" href="./erase.html">erase</a>, <a class="reference internal" href="./empty.html">empty</a>, <a class="reference internal" href="./begin.html">begin</a>, <a class="reference internal" href="./end.html">end</a></p>
 106 <!-- Sequences/Intrinsic Metafunctions//empty -->
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