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updated boost from 1_33_1 to 1_34_1
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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<!-- Copyright Aleksey Gurtovoy 2006. Distributed under the Boost -->
5<!-- Software License, Version 1.0. (See accompanying -->
6<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
7<head>
8<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
9<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
10<title>The MPL Reference Manual: pop_back</title>
11<link rel="stylesheet" href="../style.css" type="text/css" />
12</head>
13<body class="docframe refmanual">
14<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>
15<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>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="pop-back">
18<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id369" name="pop-back">pop_back</a></h1>
19<div class="section" id="pop-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename Sequence
24    &gt;
25struct <a href="./pop-back.html" class="identifier">pop_back</a>
26{
27    typedef <em>unspecified</em> type;
28};
29</pre>
30</div>
31<div class="section" id="pop-description">
32<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
33<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>
34complexity.</p>
35</div>
36<div class="section" id="pop-header">
37<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
38<pre class="literal-block">
39#include &lt;<a href="../../../../boost/mpl/pop_back.hpp" class="header">boost/mpl/pop_back.hpp</a>&gt;
40</pre>
41</div>
42<div class="section" id="pop-model-of">
43<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
44<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
45</div>
46<div class="section" id="pop-parameters">
47<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
48<table border="1" class="table">
49<colgroup>
50<col width="16%" />
51<col width="33%" />
52<col width="51%" />
53</colgroup>
54<thead valign="bottom">
55<tr><th>Parameter</th>
56<th>Requirement</th>
57<th>Description</th>
58</tr>
59</thead>
60<tbody valign="top">
61<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
62<td><a class="reference" href="./back-extensible-sequence.html">Back Extensible Sequence</a></td>
63<td>A sequence to erase the last element from.</td>
64</tr>
65</tbody>
66</table>
67</div>
68<div class="section" id="pop-expression-semantics">
69<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
70<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>
71<pre class="literal-block">
72typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;s&gt;::type r;
73</pre>
74<table class="field-list" frame="void" rules="none">
75<col class="field-name" />
76<col class="field-body" />
77<tbody valign="top">
78<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>
79</tr>
80<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>
81</tr>
82<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>
83</tr>
84<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>
85</tr>
86</tbody>
87</table>
88</div>
89<div class="section" id="pop-complexity">
90<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
91<p>Amortized constant time.</p>
92</div>
93<div class="section" id="pop-example">
94<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
95<pre class="literal-block">
96typedef <a href="./vector.html" class="identifier">vector</a>&lt;long&gt;::type types1;
97typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,int&gt;::type types2;
98typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,int,char&gt;::type types3;
99
100typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types1&gt;::type result1;
101typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types2&gt;::type result2;
102typedef <a href="./pop-back.html" class="identifier">pop_back</a>&lt;types3&gt;::type result3;
103   
104<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 );
105<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 );
106<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 );
107   
108<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; ));
109<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 > ));
110</pre>
111</div>
112<div class="section" id="pop-see-also">
113<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
114<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>
115<!-- modtime: November 13, 2004 01:30:46 +0000 -->
116<!-- Sequences/Intrinsic Metafunctions//pop_front -->
117</div>
118</div>
119
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