ceph/src/boost/libs/mpl/doc/refmanual/pop-back.html

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   7 <title>The MPL Reference Manual: pop_back</title>
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  11 <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./order.html" class="navigation-link">Prev</a>&nbsp;<a href="./pop-front.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./order.html" class="navigation-link">Back</a>&nbsp;<a href="./pop-front.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./intrinsic-metafunctions.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
  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="./pop-back.html" class="navigation-link">pop_back</a></td>
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  14 <div class="section" id="pop-back">
  15 <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1441">pop_back</a></h1>
  16 <div class="section" id="id318">
  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="./pop-back.html" class="identifier">pop_back</a>
  23 {
  24     typedef <em>unspecified</em> type;
  25 };
  26 </pre>
  27 </div>
  28 <div class="section" id="id319">
  29 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  30 <p><tt class="literal"><span class="pre"><a href="./pop-back.html" class="identifier">pop_back</a></span></tt> performs a removal at the end of the sequence with guaranteed <em>O(1)</em>
  31 complexity.</p>
  32 </div>
  33 <div class="section" id="id320">
  34 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  35 <pre class="literal-block">
  36 #include &lt;<a href="../../../../boost/mpl/pop_back.hpp" class="header">boost/mpl/pop_back.hpp</a>&gt;
  37 </pre>
  38 </div>
  39 <div class="section" id="id321">
  40 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  41 <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
  42 </div>
  43 <div class="section" id="id322">
  44 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  45 <table border="1" class="docutils table">
  46 <colgroup>
  47 <col width="16%" />
  48 <col width="33%" />
  49 <col width="51%" />
  50 </colgroup>
  51 <thead valign="bottom">
  52 <tr><th class="head">Parameter</th>
  53 <th class="head">Requirement</th>
  54 <th class="head">Description</th>
  55 </tr>
  56 </thead>
  57 <tbody valign="top">
  58 <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
  59 <td><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a></td>
  60 <td>A sequence to erase the last element from.</td>
  61 </tr>
  62 </tbody>
  63 </table>
  64 </div>
  65 <div class="section" id="id323">
  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="./back-extensible-sequence.html">Back Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
  68 <pre class="literal-block">
  69 typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;s&gt;::type r;
  70 </pre>
  71 <table class="docutils field-list" frame="void" rules="none">
  72 <col class="field-name" />
  73 <col class="field-body" />
  74 <tbody valign="top">
  75 <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>.</td>
  76 </tr>
  77 <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><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">false</span></tt>.</td>
  78 </tr>
  79 <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">Equivalent to <tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,<a href="./end.html" class="identifier">end</a>&lt;s&gt;::type&gt;::type;</span></tt>.</td>
  80 </tr>
  81 <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;r&gt;::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td>
  82 </tr>
  83 </tbody>
  84 </table>
  85 </div>
  86 <div class="section" id="id324">
  87 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
  88 <p>Amortized constant time.</p>
  89 </div>
  90 <div class="section" id="id325">
  91 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
  92 <pre class="literal-block">
  93 typedef <a href="./vector.html" class="identifier">vector</a>&lt;long&gt;::type types1;
  94 typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,int&gt;::type types2;
  95 typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,int,char&gt;::type types3;
  96
  97 typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types1&gt;::type result1;
  98 typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types2&gt;::type result2;
  99 typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types3&gt;::type result3;
 100
 101 <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;result1&gt;::value, ==, 0 );
 102 <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;result2&gt;::value, ==, 1 );
 103 <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;result3&gt;::value, ==, 2 );
 104
 105 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./back.html" class="identifier">back</a>&lt;result2&gt;::type, long&gt; ));
 106 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./back.html" class="identifier">back</a>&lt;result3&gt;::type, int > ));
 107 </pre>
 108 </div>
 109 <div class="section" id="id326">
 110 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 111 <p><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>, <a class="reference internal" href="./erase.html">erase</a>, <a class="reference internal" href="./push-back.html">push_back</a>, <a class="reference internal" href="./back.html">back</a>, <a class="reference internal" href="./pop-front.html">pop_front</a></p>
 112 <!-- Sequences/Intrinsic Metafunctions//pop_front -->
 113 </div>
 114 </div>
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