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updated boost from 1_33_1 to 1_34_1
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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) -->
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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: back</title>
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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="./at-c.html" class="navigation-link">Prev</a>&nbsp;<a href="./begin.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./at-c.html" class="navigation-link">Back</a>&nbsp;<a href="./begin.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="./back.html" class="navigation-link">back</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="back">
18<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id355" name="back">back</a></h1>
19<div class="section" id="back-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="./back.html" class="identifier">back</a>
26{
27    typedef <em>unspecified</em> type;
28};
29</pre>
30</div>
31<div class="section" id="intrinsic-back-description">
32<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
33<p>Returns the last element in the sequence.</p>
34</div>
35<div class="section" id="back-header">
36<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
37<pre class="literal-block">
38#include &lt;<a href="../../../../boost/mpl/back.hpp" class="header">boost/mpl/back.hpp</a>&gt;
39</pre>
40</div>
41<div class="section" id="back-model-of">
42<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
43<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
44</div>
45<div class="section" id="back-parameters">
46<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
47<table border="1" class="table">
48<colgroup>
49<col width="19%" />
50<col width="35%" />
51<col width="45%" />
52</colgroup>
53<thead valign="bottom">
54<tr><th>Parameter</th>
55<th>Requirement</th>
56<th>Description</th>
57</tr>
58</thead>
59<tbody valign="top">
60<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
61<td><a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a></td>
62<td>A sequence to be examined.</td>
63</tr>
64</tbody>
65</table>
66</div>
67<div class="section" id="intrinsic-back-expression-semantics">
68<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
69<p>For any <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
70<pre class="literal-block">
71typedef <a href="./back.html" class="identifier">back</a>&lt;s&gt;::type t;
72</pre>
73<table class="field-list" frame="void" rules="none">
74<col class="field-name" />
75<col class="field-body" />
76<tbody valign="top">
77<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
78</tr>
79<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>
80</tr>
81<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
82<pre class="last literal-block">
83typedef <a href="./deref.html" class="identifier">deref</a>&lt; <a href="./prior.html" class="identifier">prior</a>&lt; <a href="./end.html" class="identifier">end</a>&lt;s&gt;::type &gt;::type &gt;::type t;
84</pre>
85</td>
86</tr>
87</tbody>
88</table>
89</div>
90<div class="section" id="back-complexity">
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="back-example">
95<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
96<pre class="literal-block">
97typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,1&gt; range1;
98typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt; range2;
99typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,-10,0&gt; range3;
100   
101<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./back.html" class="identifier">back</a>&lt;range1&gt;::value, ==, 0 );
102<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./back.html" class="identifier">back</a>&lt;range2&gt;::value, ==, 9 );
103<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./back.html" class="identifier">back</a>&lt;range3&gt;::value, ==, -1 );
104</pre>
105</div>
106<div class="section" id="intrinsic-back-see-also">
107<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
108<p><a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>, <a class="refentry reference" href="./front.html"><tt class="refentry literal"><span class="pre">front</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="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a>, <a class="refentry reference" href="./deref.html"><tt class="refentry literal"><span class="pre">deref</span></tt></a>, <a class="refentry reference" href="./at.html"><tt class="refentry literal"><span class="pre">at</span></tt></a></p>
109<!-- modtime: November 13, 2004 01:24:30 +0000 -->
110<!-- Sequences/Intrinsic Metafunctions//begin -->
111</div>
112</div>
113
114<div class="footer-separator"></div>
115<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./at-c.html" class="navigation-link">Prev</a>&nbsp;<a href="./begin.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./at-c.html" class="navigation-link">Back</a>&nbsp;<a href="./begin.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>
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