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<a name="boost.signals2.scoped_connection"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class scoped_connection</span></h2>
<p>boost::signals2::scoped_connection &#8212; Limits a signal-slot connection lifetime to a particular scope.</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../signals2/reference.html#header.boost.signals2.connection_hpp" title="Header &lt;boost/signals2/connection.hpp&gt;">boost/signals2/connection.hpp</a>&gt;
</span>
<span class="keyword">class</span> <a class="link" href="scoped_connection.html" title="Class scoped_connection">scoped_connection</a> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="connection.html" title="Class connection">connection</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// <a class="link" href="scoped_connection.html#id1160248-bbconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="scoped_connection.html#id1160251-bb"><span class="identifier">scoped_connection</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="scoped_connection.html#id1132275-bb"><span class="identifier">scoped_connection</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="scoped_connection.html#id671725-bb"><span class="special">~</span><span class="identifier">scoped_connection</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="scoped_connection.html#id1155345-bb">public methods</a></span>
<span class="identifier">scoped_connection</span> <span class="special">&amp;</span> <a class="link" href="scoped_connection.html#id1131952-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">connection</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="connection.html" title="Class connection">connection</a> <a class="link" href="scoped_connection.html#id465457-bb"><span class="identifier">release</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">private</span><span class="special">:</span>
<span class="comment">// <a class="link" href="scoped_connection.html#id638600-bbconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="scoped_connection.html#id697645-bb"><span class="identifier">scoped_connection</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="scoped_connection.html" title="Class scoped_connection">scoped_connection</a><span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
scoped_connection&amp; <a class="link" href="scoped_connection.html#id1156122-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="scoped_connection.html" title="Class scoped_connection">scoped_connection</a><span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id2543524"></a><h2>Description</h2>
<p>A <a class="link" href="connection.html" title="Class connection">connection</a> which automatically disconnects on destruction.</p>
<div class="section">
<div class="titlepage"><div><div><h6 class="title">
<a name="id2543540"></a>Thread Safety</h6></div></div></div>
<p>The methods of the <code class="computeroutput">scoped_connection</code> class (including those
inherited from its base <code class="computeroutput">connection</code> class) are thread-safe with the exception
of <a class="link" href="connection.html#id666558-bb">signals2::connection::swap</a>, <a class="link" href="scoped_connection.html#id465457-bb">release</a>, and
the assignment operator. A <code class="computeroutput">scoped_connection</code> object
should not be accessed concurrently when any of these operations is in progress.
However, it is always safe to access a different <code class="computeroutput">connection</code> object
in another thread, even if it references the same underlying signal-slot connection.
</p>
</div>
<div class="refsect2">
<a name="id2543595"></a><h3>
<a name="id1160248-bbconstruct-copy-destruct"></a><code class="computeroutput">scoped_connection</code> public construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1160251-bb"></a><span class="identifier">scoped_connection</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Default constructs an empty scoped_connection.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput"><a class="link" href="connection.html#id1171356-bb">connected</a>() == false </code></p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td><p>Will not throw.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id1132275-bb"></a><span class="identifier">scoped_connection</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&amp;</span> other<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p><code class="computeroutput">this</code> references
the connection referenced by
<code class="computeroutput">other</code>.</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput"><a class="link" href="connection.html#id1171356-bb">connected</a>() == other.connected()</code></p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td><p>Will not throw.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id671725-bb"></a><span class="special">~</span><span class="identifier">scoped_connection</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p>If
<code class="computeroutput">this-&gt;<a class="link" href="connection.html#id1171356-bb">connected</a>()</code>,
disconnects the signal-slot connection.</p></td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2543827"></a><h3>
<a name="id1155345-bb"></a><code class="computeroutput">scoped_connection</code> public methods</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">scoped_connection</span> <span class="special">&amp;</span> <a name="id1131952-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">connection</span> <span class="special">&amp;</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p><code class="computeroutput">this</code> references
the connection referenced by
<code class="computeroutput">rhs</code>. If <code class="computeroutput">this</code> already references another
connection, the old connection will be disconnected first.
</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput"><a class="link" href="connection.html#id1171356-bb">connected</a>() == rhs.connected()</code></p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="connection.html" title="Class connection">connection</a> <a name="id465457-bb"></a><span class="identifier">release</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p>
Releases the connection so it will not be disconnected by the <code class="computeroutput">scoped_connection</code>
when it is destroyed or reassigned. The <code class="computeroutput">scoped_connection</code> is reset to
the NULL connection after this call completes.
</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput"><a class="link" href="connection.html#id1171356-bb">connected</a>() == false</code></p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A <a class="link" href="connection.html" title="Class connection">connection</a> object referencing the connection which was
released by the <code class="computeroutput">scoped_connection</code>.
</p></td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id2544054"></a><h3>
<a name="id638600-bbconstruct-copy-destruct"></a><code class="computeroutput">scoped_connection</code> private construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id697645-bb"></a><span class="identifier">scoped_connection</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="scoped_connection.html" title="Class scoped_connection">scoped_connection</a><span class="special">&amp;</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>The scoped_connection class is not copyable. It may only be constructed from a <code class="computeroutput"><a class="link" href="connection.html" title="Class connection">connection</a></code> object.</p>
</li>
<li class="listitem">
<pre class="literallayout">scoped_connection&amp; <a name="id1156122-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="scoped_connection.html" title="Class scoped_connection">scoped_connection</a><span class="special">&amp;</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>The scoped_connection class is not copyable. It may only be assigned from a <code class="computeroutput"><a class="link" href="connection.html" title="Class connection">connection</a></code> object.</p>
</li>
</ol></div>
</div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2004 Douglas Gregor<br>Copyright &#169; 2007-2009 Frank Mori Hess<p>Distributed under the Boost
Software License, Version 1.0. (See accompanying file
<code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
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