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<title>Class scoped_connection</title>
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<div class="refentry">
<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#idp94116216-bbconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="scoped_connection.html#idp58338184-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#idp93037608-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#idp58771064-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#idp57964136-bb">public methods</a></span>
  <span class="identifier">scoped_connection</span> <span class="special">&amp;</span> <a class="link" href="scoped_connection.html#idp93020824-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#idp60420184-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#idp93330152-bbconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="scoped_connection.html#idp93330344-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#idp94538824-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="idp205100056"></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="idp205101048"></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#idp103575784-bb">signals2::connection::swap</a>, <a class="link" href="scoped_connection.html#idp60420184-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="idp205104328"></a><h3>
<a name="idp94116216-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="idp58338184-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" class="variablelist compact">
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<td><p><span class="term">Postconditions:</span></p></td>
<td><p><code class="computeroutput"><a class="link" href="connection.html#idp60537160-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="idp93037608-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" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
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<tbody>
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<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#idp60537160-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="idp58771064-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" 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-&gt;<a class="link" href="connection.html#idp60537160-bb">connected</a>()</code>,
            disconnects the signal-slot connection.</p></td>
</tr></tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp205118280"></a><h3>
<a name="idp57964136-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="idp93020824-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" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
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<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#idp60537160-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="idp60420184-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" class="variablelist compact">
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<col align="left" valign="top">
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<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#idp60537160-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="idp205131896"></a><h3>
<a name="idp93330152-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="idp93330344-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="idp94538824-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>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<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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