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1<?xml version="1.0" encoding="utf-8" ?>
2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
6<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
7<title>The MPL Reference Manual: pop_back</title>
8<link rel="stylesheet" href="../style.css" type="text/css" />
9</head>
10<body class="docframe refmanual">
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>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="pop-back">
15<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id369" name="pop-back">pop_back</a></h1>
16<div class="section" id="pop-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Sequence
21    &gt;
22struct <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="pop-description">
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>
31complexity.</p>
32</div>
33<div class="section" id="pop-header">
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="pop-model-of">
40<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
41<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
42</div>
43<div class="section" id="pop-parameters">
44<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
45<table border="1" class="table">
46<colgroup>
47<col width="16%" />
48<col width="33%" />
49<col width="51%" />
50</colgroup>
51<thead valign="bottom">
52<tr><th>Parameter</th>
53<th>Requirement</th>
54<th>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" 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="pop-expression-semantics">
66<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
67<p>For any <a class="reference" href="./back-extensible-sequence.html">Back Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
68<pre class="literal-block">
69typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;s&gt;::type r;
70</pre>
71<table class="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" 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="pop-complexity">
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="pop-example">
91<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
92<pre class="literal-block">
93typedef <a href="./vector.html" class="identifier">vector</a>&lt;long&gt;::type types1;
94typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,int&gt;::type types2;
95typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,int,char&gt;::type types3;
96
97typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types1&gt;::type result1;
98typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types2&gt;::type result2;
99typedef <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="pop-see-also">
110<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
111<p><a class="reference" href="./back-extensible-sequence.html">Back Extensible Sequence</a>, <a class="refentry reference" href="./erase.html"><tt class="refentry literal"><span class="pre">erase</span></tt></a>, <a class="refentry reference" href="./push-back.html"><tt class="refentry literal"><span class="pre">push_back</span></tt></a>, <a class="refentry reference" href="./back.html"><tt class="refentry literal"><span class="pre">back</span></tt></a>, <a class="refentry reference" href="./pop-front.html"><tt class="refentry literal"><span class="pre">pop_front</span></tt></a></p>
112<!-- modtime: November 13, 2004 01:30:46 +0000 -->
113<!-- Sequences/Intrinsic Metafunctions//pop_front -->
114</div>
115</div>
116
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