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boost_mpl/doc/refmanual/back.html
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Dave Abrahams 4b303f2a4a Add license/copyright 
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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<!-- Copyright Aleksey Gurtovoy 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="Docutils 0.3.6: http://docutils.sourceforge.net/" />
<title>The MPL Reference Manual: back</title>
<link rel="stylesheet" href="../style.css" type="text/css" />
</head>
<body class="docframe refmanual">
<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>
<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>
</tr></table><div class="header-separator"></div>
<div class="section" id="back">
<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id355" name="back">back</a></h1>
<div class="section" id="back-synopsis">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
typename Sequence
&gt;
struct <a href="./back.html" class="identifier">back</a>
{
typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="intrinsic-back-description">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns the last element in the sequence.</p>
</div>
<div class="section" id="back-header">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/back.hpp" class="header">boost/mpl/back.hpp</a>&gt;
</pre>
</div>
<div class="section" id="back-model-of">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference" href="./tag-dispatched.html">Tag Dispatched Metafunction</a></p>
</div>
<div class="section" id="back-parameters">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
<table border="1" class="table">
<colgroup>
<col width="19%" />
<col width="35%" />
<col width="45%" />
</colgroup>
<thead valign="bottom">
<tr><th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
<td><a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a></td>
<td>A sequence to be examined.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="intrinsic-back-expression-semantics">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./back.html" class="identifier">back</a>&lt;s&gt;::type t;
</pre>
<table class="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 type.</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>&lt;s&gt;::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"><p class="first">Equivalent to</p>
<pre class="last literal-block">
typedef <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;
</pre>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="back-complexity">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
</div>
<div class="section" id="back-example">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,1&gt; range1;
typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt; range2;
typedef <a href="./range-c.html" class="identifier">range_c</a>&lt;int,-10,0&gt; range3;
<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 );
<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 );
<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 );
</pre>
</div>
<div class="section" id="intrinsic-back-see-also">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<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>
<!-- modtime: November 13, 2004 01:24:30 +0000 -->
<!-- Sequences/Intrinsic Metafunctions//begin -->
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