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<div class="refentry">
<a name="boost.signals2.connection"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class connection</span></h2>
<p>boost::signals2::connection — Query/disconnect a signal-slot connection.</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: <<a class="link" href="../../signals2/reference.html#header.boost.signals2.connection_hpp" title="Header <boost/signals2/connection.hpp>">boost/signals2/connection.hpp</a>>
</span>
<span class="keyword">class</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="connection.html#boost.signals2.connectionconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="connection.html#idm46563209490992-bb"><span class="identifier">connection</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="connection.html#idm46563209487744-bb"><span class="identifier">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">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="connection.html#idm46563209482928-bb"><span class="identifier">connection</span></a><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&&</span><span class="special">)</span><span class="special">;</span>
connection& <a class="link" href="connection.html#idm46563209476944-bb"><span class="keyword">operator</span><span class="special">=</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">&</span><span class="special">)</span><span class="special">;</span>
connection& <a class="link" href="connection.html#idm46563209472128-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="connection.html#idm46563209466144-bb">connection management</a></span>
<span class="keyword">void</span> <a class="link" href="connection.html#idm46563209465584-bb"><span class="identifier">disconnect</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="connection.html#idm46563209460720-bb"><span class="identifier">connected</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// <a class="link" href="connection.html#idm46563209456592-bb">blocking</a></span>
<span class="keyword">bool</span> <a class="link" href="connection.html#idm46563209456032-bb"><span class="identifier">blocked</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// <a class="link" href="connection.html#idm46563209451024-bb">modifiers</a></span>
<span class="keyword">void</span> <a class="link" href="connection.html#idm46563209450464-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="connection.html#idm46563209444784-bb">comparisons</a></span>
<span class="keyword">bool</span> <a class="link" href="connection.html#idm46563209444224-bb"><span class="keyword">operator</span><span class="special">==</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">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="connection.html#idm46563209436944-bb"><span class="keyword">operator</span><span class="special">!=</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">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="connection.html#idm46563209432064-bb"><span class="keyword">operator</span><span class="special"><</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">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span>
<span class="comment">// <a class="link" href="connection.html#idm46563209424560-bb">specialized algorithms</a></span>
<span class="keyword">void</span> <a class="link" href="connection.html#boost.signals2.connection.swap_idm46563209424000"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span><span class="special">,</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span><span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45927784439392"></a><h2>Description</h2>
<p>The <a class="link" href="connection.html" title="Class connection">signals2::connection</a> class represents
a connection between a Signal and a Slot. It is a
lightweight object that has the ability to query whether the
signal and slot are currently connected, and to disconnect
the signal and slot. It is always safe to query or
disconnect a connection.</p>
<div class="section">
<div class="titlepage"><div><div><h6 class="title">
<a name="idm45927784437264"></a>Thread Safety</h6></div></div></div>
<p>The methods of the <code class="computeroutput">connection</code> class are thread-safe with the exception
of <a class="link" href="connection.html#idm46563209450464-bb">swap</a> and the assignment operator. A <code class="computeroutput">connection</code> object
should not be accessed concurrently when either 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 the two <code class="computeroutput">connection</code> objects are copies
of each other which refer to the same underlying connection.
</p>
</div>
<div class="refsect2">
<a name="idm45927784432016"></a><h3>
<a name="boost.signals2.connectionconstruct-copy-destruct"></a><code class="computeroutput">connection</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm46563209490992-bb"></a><span class="identifier">connection</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p>Sets the currently represented connection to the
NULL connection.</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput">!this-><a class="link" href="connection.html#idm46563209460720-bb">connected</a>()</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="idm46563209487744-bb"></a><span class="identifier">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">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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">Throws:</span></p></td>
<td><p>Will not throw.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm46563209482928-bb"></a><span class="identifier">connection</span><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&&</span> other<span class="special">)</span><span class="special">;</span></pre>
<p>Move constructor.</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p><code class="computeroutput">this</code> references
the connection formerly referenced by
<code class="computeroutput">other</code>. The moved-from <code class="computeroutput">other</code>
no longer references any connection.</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">connection& <a name="idm46563209476944-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<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>.</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">connection& <a name="idm46563209472128-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&&</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>Move assignment.</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p><code class="computeroutput">this</code> references
the connection formerly referenced by
<code class="computeroutput">rhs</code>. The moved-from <code class="computeroutput">rhs</code>
no longer references any connection.</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>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45927784382640"></a><h3>
<a name="idm46563209466144-bb"></a><code class="computeroutput">connection</code> connection management</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46563209465584-bb"></a><span class="identifier">disconnect</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p>If
<code class="computeroutput">this-><a class="link" href="connection.html#idm46563209460720-bb">connected</a>()</code>,
disconnects the signal and slot referenced by this;
otherwise, this operation is a no-op.</p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput">!this-><a class="link" href="connection.html#idm46563209460720-bb">connected</a>()</code>.</p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm46563209460720-bb"></a><span class="identifier">connected</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if this
references a non-NULL connection that is still active
(connected), and <code class="computeroutput">false</code>
otherwise.</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>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45927784361680"></a><h3>
<a name="idm46563209456592-bb"></a><code class="computeroutput">connection</code> blocking</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm46563209456032-bb"></a><span class="identifier">blocked</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
Queries if the connection is blocked. A connection may be blocked by creating a
<code class="computeroutput"><a class="link" href="shared_connection_block.html" title="Class shared_connection_block">boost::signals2::shared_connection_block</a></code> object.
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if the associated slot is either disconnected or blocked, <code class="computeroutput">false</code> otherwise.</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></ol></div>
</div>
<div class="refsect2">
<a name="idm45927784349216"></a><h3>
<a name="idm46563209451024-bb"></a><code class="computeroutput">connection</code> modifiers</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm46563209450464-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p>Swaps the connections referenced in
<code class="computeroutput">this</code> and
<code class="computeroutput">other</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></ol></div>
</div>
<div class="refsect2">
<a name="idm45927784337648"></a><h3>
<a name="idm46563209444784-bb"></a><code class="computeroutput">connection</code> comparisons</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm46563209444224-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> other<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if
<code class="computeroutput">this</code> and
<code class="computeroutput">other</code> reference the same
connection or both reference the NULL connection, and
<code class="computeroutput">false</code>
otherwise.</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"><span class="keyword">bool</span> <a name="idm46563209436944-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> other<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">!(*this == other)</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"><span class="keyword">bool</span> <a name="idm46563209432064-bb"></a><span class="keyword">operator</span><span class="special"><</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> other<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if the
connection referenced by
<code class="computeroutput">this</code> precedes the
connection referenced by
<code class="computeroutput">other</code> based on some
unspecified ordering, and
<code class="computeroutput">false</code>
otherwise.</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>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45927784299664"></a><h3>
<a name="idm46563209424560-bb"></a><code class="computeroutput">connection</code> specialized algorithms</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="boost.signals2.connection.swap_idm46563209424000"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> x<span class="special">,</span> <a class="link" href="connection.html" title="Class connection">connection</a><span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td><p><code class="computeroutput">x.swap(y)</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></ol></div>
</div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2004 Douglas Gregor<br>Copyright © 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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