113 lines
6.9 KiB
HTML
113 lines
6.9 KiB
HTML
<?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">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
|
|
<title>The MPL Reference Manual: deref</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="./prior.html" class="navigation-link">Prev</a> <a href="./iterator-category.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./prior.html" class="navigation-link">Back</a> <a href="./iterator-category.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </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="./iterators.html" class="navigation-link">Iterators</a> / <a href="./iterator-metafunctions.html" class="navigation-link">Iterator Metafunctions</a> / <a href="./deref.html" class="navigation-link">deref</a></td>
|
|
</tr></table><div class="header-separator"></div>
|
|
<div class="section" id="deref">
|
|
<h1><a class="toc-backref" href="./iterator-metafunctions.html#id1458">deref</a></h1>
|
|
<div class="section" id="id437">
|
|
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
|
|
<pre class="literal-block">
|
|
template<
|
|
typename Iterator
|
|
>
|
|
struct <a href="./deref.html" class="identifier">deref</a>
|
|
{
|
|
typedef <em>unspecified</em> type;
|
|
};
|
|
</pre>
|
|
</div>
|
|
<div class="section" id="id438">
|
|
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
|
|
<p>Dereferences an iterator.</p>
|
|
</div>
|
|
<div class="section" id="id439">
|
|
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
|
|
<pre class="literal-block">
|
|
#include <<a href="../../../../boost/mpl/deref.hpp" class="header">boost/mpl/deref.hpp</a>>
|
|
</pre>
|
|
</div>
|
|
<div class="section" id="id440">
|
|
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
|
|
<table border="1" class="docutils table">
|
|
<colgroup>
|
|
<col width="19%" />
|
|
<col width="35%" />
|
|
<col width="45%" />
|
|
</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">Iterator</span></tt></td>
|
|
<td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td>
|
|
<td>The iterator to dereference.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<div class="section" id="id441">
|
|
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
|
|
<p>For any <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>s <tt class="literal"><span class="pre">iter</span></tt>:</p>
|
|
<pre class="literal-block">
|
|
typedef <a href="./deref.html" class="identifier">deref</a><iter>::type t;
|
|
</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"><p class="first">A type.</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">iter</span></tt> is dereferenceable.</p>
|
|
</td>
|
|
</tr>
|
|
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">t</span></tt> is identical to the element referenced by <tt class="literal"><span class="pre">iter</span></tt>. If <tt class="literal"><span class="pre">iter</span></tt> is
|
|
a user-defined iterator, the library-provided default implementation is
|
|
equivalent to</p>
|
|
<pre class="last literal-block">
|
|
typedef iter::type t;
|
|
</pre>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<div class="section" id="id442">
|
|
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
|
|
<p>Amortized constant time.</p>
|
|
</div>
|
|
<div class="section" id="id443">
|
|
<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><char,short,int,long> types;
|
|
typedef <a href="./begin.html" class="identifier">begin</a><types>::type iter;
|
|
|
|
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./deref.html" class="identifier">deref</a><iter>::type, char > ));
|
|
</pre>
|
|
</div>
|
|
<div class="section" id="id444">
|
|
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
|
|
<p><a class="reference internal" href="./iterators.html">Iterators</a>, <a class="reference internal" href="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./next.html">next</a></p>
|
|
<!-- Iterators/Iterator Metafunctions//iterator_category |60 -->
|
|
</div>
|
|
</div>
|
|
|
|
<div class="footer-separator"></div>
|
|
<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./prior.html" class="navigation-link">Prev</a> <a href="./iterator-category.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./prior.html" class="navigation-link">Back</a> <a href="./iterator-category.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iterator-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
|
|
<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body>
|
|
</html>
|