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[SVN r10915]
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Peter Dimov
2001-08-23 18:47:44 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Boost: ref.hpp documentation</title>
</head>
<body bgcolor="White">
<table border="0" width="100%">
<tr>
<td align="center">
<table border="0" width="90%">
<tr>
<td width="277">
<img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277" height="86">
</td>
<td align="center">
<table border="0">
<tr><td nowrap><h1>ref.hpp</h1></td></tr>
<tr><td align="right" nowrap><small>&nbsp;1.00.0003 (2001-08-22)</small></td></tr>
</table>
</td>
</tr>
<tr>
<td height="64">&nbsp;</td>
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<tr>
<td>
<h2>Files</h2>
<ul>
<li><a href="../../boost/ref.hpp">ref.hpp</a>
</ul>
<h2>Purpose</h2>
<p>
The header <a href="../../boost/ref.hpp">boost/ref.hpp</a> defines the class template
<b>boost::reference_wrapper&lt;T&gt;</b> and the two functions <b>boost::ref</b> and
<b>boost::cref</b> that return instances of <b>boost::reference_wrapper&lt;T&gt;</b>.
</p>
<p>
The purpose of <b>boost::reference_wrapper&lt;T&gt;</b> is to contain a reference to
an object of type <b>T</b>. It is primarily used to "feed" references to
function templates (algorithms) that take their parameter by value.
</p>
<p>
To support this usage, <b>boost::reference_wrapper&lt;T&gt;</b> provides an implicit
conversion to <b>T &amp;</b>. This usually allows the function templates to
work on references unmodified.
</p>
<p>
<b>boost::reference_wrapper&lt;T&gt;</b> is <b>CopyConstructible</b>, but it is not
<b>Assignable</b>.
</p>
<p>
The expression <b>boost::ref(x)</b> returns a <b>boost::reference_wrapper&lt;X&gt;(x)</b>
where <b>X</b> is the type of <b>x</b>. Similarly, <b>boost::cref(x)</b>
returns a <b>boost::reference_wrapper&lt;X const&gt;(x)</b>.
</p>
<h2>Interface</h2>
<h3>Synopsis</h3>
<pre>
namespace boost
{
template&lt;class T&gt; class <a href="#reference_wrapper">reference_wrapper</a>;
template&lt;class T&gt; reference_wrapper&lt;T&gt; <a href="#ref">ref</a>(T &amp; t);
template&lt;class T&gt; reference_wrapper&lt;T const&gt; <a href="#cref">cref</a>(T const &amp; t);
}
</pre>
<h3><a name="reference_wrapper">reference_wrapper</a></h3>
<pre>
template&lt;class T&gt; class reference_wrapper
{
public:
explicit <a href="#rt_construct">reference_wrapper</a>(T &amp; t);
<a href="#rt_operator">operator T &amp;</a> () const;
T &amp; <a href="#rt_get">get</a>() const;
};
</pre>
<h4><a name="rt_construct">explicit reference_wrapper(T &amp; t)</a></h4>
<p>
<b>Effects:</b> Constructs a <b>reference_wrapper</b> object that stores a reference to <b>t</b>.
</p>
<p>
<b>Throws:</b> Nothing.
</p>
<h4><a name="rt_operator">operator T &amp; () const</a></h4>
<p>
<b>Returns:</b> the stored reference.
</p>
<p>
<b>Throws:</b> Nothing.
</p>
<h4><a name="rt_get">T &amp; get() const</a></h4>
<p>
<b>Returns:</b> the stored reference.
</p>
<p>
<b>Throws:</b> Nothing.
</p>
<h3><a name="ref">ref</a></h3>
<pre>
template&lt;class T&gt; reference_wrapper&lt;T&gt; ref(T &amp; t);
</pre>
<p>
<b>Returns:</b> <tt>reference_wrapper&lt;T&gt;(t)</tt>.
</p>
<p>
<b>Throws:</b> Nothing.
</p>
<h3><a name="cref">cref</a></h3>
<pre>
template&lt;class T&gt; reference_wrapper&lt;T const&gt; cref(T const &amp; t);
</pre>
<p>
<b>Returns:</b> <tt>reference_wrapper&lt;T const&gt;(t)</tt>.
</p>
<p>
<b>Throws:</b> Nothing.
</p>
<h2>Acknowledgements</h2>
<p>
<b>ref</b> and <b>cref</b> were originally part of the Boost.Tuple library.
They were "promoted to <b>boost::</b> status" because they are generally
useful.
</p>
<p><br><br><br><small>Copyright &copy; 2001 by Peter Dimov and Multi Media
Ltd. Permission to copy, use, modify, sell and distribute this document is
granted provided this copyright notice appears in all copies. This document
is provided &quot;as is&quot; without express or implied warranty, and with
no claim as to its suitability for any purpose.</small></p>
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