<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class slot_base</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../signals2/reference.html#header.boost.signals2.slot_base_hpp" title="Header <boost/signals2/slot_base.hpp>"> <link rel="prev" href="slot/arg.html" title="Class template arg"> <link rel="next" href="expired_slot.html" title="Class expired_slot"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td 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<h2><span class="refentrytitle">Class slot_base</span></h2> <p>boost::signals2::slot_base — Base class for slots.</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.slot_base_hpp" title="Header <boost/signals2/slot_base.hpp>">boost/signals2/slot_base.hpp</a>> </span> <span class="keyword">class</span> <a class="link" href="slot_base.html" title="Class slot_base">slot_base</a> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// types</span> <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="emphasis"><em><span class="identifier">implementation</span><span class="special">-</span><span class="identifier">detail</span></em></span><span class="special">></span> <a name="boost.signals2.slot_base.locked_container_type"></a><span class="identifier">locked_container_type</span><span class="special">;</span> <span class="comment">// <a class="link" href="slot_base.html#idm45507049299952-bb">tracking</a></span> <span class="keyword">bool</span> <a class="link" href="slot_base.html#idm45507049299392-bb"><span class="identifier">expired</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">locked_container_type</span> <a class="link" href="slot_base.html#idm45507104425808-bb"><span class="identifier">lock</span></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></pre></div> <div class="refsect1"> <a name="idm45555129471104"></a><h2>Description</h2> <p></p> <div class="refsect2"> <a name="idm45555129470304"></a><h3> <a name="idm45507049299952-bb"></a><code class="computeroutput">slot_base</code> tracking</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45507049299392-bb"></a><span class="identifier">expired</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 any tracked object has expired.</p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">locked_container_type</span> <a name="idm45507104425808-bb"></a><span class="identifier">lock</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>A container holding <code class="computeroutput">shared_ptr</code>s to each of the slot's tracked objects. As long as the returned container is kept in scope, none of the slot's tracked objects can expire.</td> </tr> <tr> <td><p><span class="term">Throws:</span></p></td> <td> <a class="link" href="expired_slot.html" title="Class expired_slot">expired_slot</a> if any of the slot's tracked objects have expired.</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> <td align="left"></td> <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> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="slot/arg.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../signals2/reference.html#header.boost.signals2.slot_base_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="expired_slot.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>