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- <title>The MPL Reference Manual: pop_back</title>
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- <div class="section" id="pop-back">
- <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1441">pop_back</a></h1>
- <div class="section" id="id318">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Sequence
- >
- struct <a href="./pop-back.html" class="identifier">pop_back</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id319">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <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>
- complexity.</p>
- </div>
- <div class="section" id="id320">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/pop_back.hpp" class="header">boost/mpl/pop_back.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id321">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
- </div>
- <div class="section" id="id322">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="16%" />
- <col width="33%" />
- <col width="51%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
- <td><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a></td>
- <td>A sequence to erase the last element from.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id323">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <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>
- <pre class="literal-block">
- typedef <a href="./pop-back.html" class="identifier">pop_back</a><s>::type r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <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>
- </tr>
- <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><s>::value</span> <span class="pre">==</span> <span class="pre">false</span></tt>.</td>
- </tr>
- <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><s,<a href="./end.html" class="identifier">end</a><s>::type>::type;</span></tt>.</td>
- </tr>
- <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><r>::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id324">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Amortized constant time.</p>
- </div>
- <div class="section" id="id325">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- typedef <a href="./vector.html" class="identifier">vector</a><long>::type types1;
- typedef <a href="./vector.html" class="identifier">vector</a><long,int>::type types2;
- typedef <a href="./vector.html" class="identifier">vector</a><long,int,char>::type types3;
- typedef <a href="./pop-back.html" class="identifier">pop_back</a><types1>::type result1;
- typedef <a href="./pop-back.html" class="identifier">pop_back</a><types2>::type result2;
- typedef <a href="./pop-back.html" class="identifier">pop_back</a><types3>::type result3;
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><result1>::value, ==, 0 );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><result2>::value, ==, 1 );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><result3>::value, ==, 2 );
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./back.html" class="identifier">back</a><result2>::type, long> ));
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./back.html" class="identifier">back</a><result3>::type, int > ));
- </pre>
- </div>
- <div class="section" id="id326">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <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>
- <!-- Sequences/Intrinsic Metafunctions//pop_front -->
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