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 <div><h2 class="title">
 <a name="signals2"></a>Chapter&#160;19.&#160;Boost.Signals2</h2></div>
 <div><div class="author"><h3 class="author">
 <span class="firstname">Douglas</span> <span class="surname">Gregor</span>
 </h3></div></div>
 <div><div class="author"><h3 class="author">
 <span class="firstname">Frank</span> <span class="othername">Mori</span> <span class="surname">Hess</span>
 </h3></div></div>
 <div><p class="copyright">Copyright &#169; 2001-2004 Douglas Gregor</p></div>
 <div><p class="copyright">Copyright &#169; 2007-2009 Frank Mori Hess</p></div>
 <div><div class="legalnotice">
 <a name="id2538393"></a><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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 <p><b>Table of Contents</b></p>
 <dl>
 <dt><span class="section"><a href="signals2.html#id2538417">Introduction</a></span></dt>
 <dd><dl><dt><span class="section"><a href="signals2.html#id2538454">Signals2</a></span></dt></dl></dd>
 <dt><span class="section"><a href="signals2/tutorial.html">Tutorial</a></span></dt>
 <dd><dl>
 <dt><span class="section"><a href="signals2/tutorial.html#id2538487">How to Read this Tutorial</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#id2538550">Hello, World! (Beginner)</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#id2538616">Calling Multiple Slots</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#id2538877">Passing Values to and from Slots</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#id2539307">Connection Management</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.document-view">Example: Document-View</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.extended-slot-type">Giving a Slot Access to its Connection (Advanced)</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.signal-mutex-template-parameter">Changing the <code class="computeroutput">Mutex</code> Type of a Signal (Advanced).</a></span></dt>
 <dt><span class="section"><a href="signals2/tutorial.html#id2540629">Linking against the Signals2 library</a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="signals2/examples.html">Example programs</a></span></dt>
 <dd><dl>
 <dt><span class="section"><a href="signals2/examples.html#signals2.examples.misc">Miscellaneous Tutorial Examples</a></span></dt>
 <dt><span class="section"><a href="signals2/examples.html#signals2.examples.document-view">Document-View</a></span></dt>
 <dt><span class="section"><a href="signals2/examples.html#signals2.examples.deconstruct">Postconstructors and Predestructors with <code class="computeroutput">deconstruct()</code></a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="signals2/reference.html">Reference</a></span></dt>
 <dd><dl>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2_hpp">Header &lt;boost/signals2.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.connection_hpp">Header &lt;boost/signals2/connection.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.deconstruct_hpp">Header &lt;boost/signals2/deconstruct.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.dummy_mutex_hpp">Header &lt;boost/signals2/dummy_mutex.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.last_value_hpp">Header &lt;boost/signals2/last_value.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.mutex_hpp">Header &lt;boost/signals2/mutex.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.optional_last_value_hpp">Header &lt;boost/signals2/optional_last_value.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.shared_connection_block_hpp">Header &lt;boost/signals2/shared_connection_block.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_hpp">Header &lt;boost/signals2/signal.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_base_hpp">Header &lt;boost/signals2/signal_base.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_type_hpp">Header &lt;boost/signals2/signal_type.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.slot_hpp">Header &lt;boost/signals2/slot.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.slot_base_hpp">Header &lt;boost/signals2/slot_base.hpp&gt;</a></span></dt>
 <dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.trackable_hpp">Header &lt;boost/signals2/trackable.hpp&gt;</a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="signals2/thread-safety.html">Thread-Safety</a></span></dt>
 <dd><dl>
 <dt><span class="section"><a href="signals2/thread-safety.html#id2564768">Introduction</a></span></dt>
 <dt><span class="section"><a href="signals2/thread-safety.html#id2564825">Signals and combiners</a></span></dt>
 <dt><span class="section"><a href="signals2/thread-safety.html#id2564989">Connections and other classes</a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="signals2/faq.html">Frequently Asked Questions</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html">Design Rationale</a></span></dt>
 <dd><dl>
 <dt><span class="section"><a href="signals2/rationale.html#id2565329">User-level Connection Management</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html#id2565501">Automatic Connection Management</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html#id2565661"><code class="computeroutput">optional_last_value</code> as the Default Combiner</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html#id2565721">Combiner Interface</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html#id2565802">Connection Interfaces: +=  operator</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html#id2565973">Signals2 Mutex Classes</a></span></dt>
 <dt><span class="section"><a href="signals2/rationale.html#id2566068">Comparison with other Signal/Slot implementations</a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="signals2/api_changes.html">Signals2 API Changes</a></span></dt>
 <dd><dl>
 <dt><span class="section"><a href="signals2/api_changes.html#signals2.porting">Porting from Boost.Signals to Boost.Signals2</a></span></dt>
 <dt><span class="section"><a href="signals2/api_changes.html#signals2.api_history">Signals2 API Development</a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="signals2/tests.html">Testsuite</a></span></dt>
 <dd><dl><dt><span class="section"><a href="signals2/tests.html#id2567366">Acceptance tests</a></span></dt></dl></dd>
 </dl>
 </div>
 <div class="section">
 <div class="titlepage"><div><div><h2 class="title" style="clear: both">
 <a name="id2538417"></a>Introduction</h2></div></div></div>
 <div class="toc"><dl><dt><span class="section"><a href="signals2.html#id2538454">Signals2</a></span></dt></dl></div>
 <p>The Boost.Signals2 library is an implementation of a managed
   signals and slots system. Signals represent callbacks with multiple
   targets, and are also called publishers or events in similar
   systems. Signals are connected to some set of slots, which are
   callback receivers (also called event targets or subscribers), which
   are called when the signal is "emitted."</p>
 <p>Signals and slots are managed, in that signals and slots (or,
   more properly, objects that occur as part of the slots) can track
   connections and are capable of automatically disconnecting signal/slot
   connections when either is destroyed. This enables the user to make
   signal/slot connections without expending a great effort to manage the
   lifetimes of those connections with regard to the lifetimes of all
   objects involved.</p>
 <p>When signals are connected to multiple slots, there is a
   question regarding the relationship between the return values of the
   slots and the return value of the signals. Boost.Signals2 allows the
   user to specify the manner in which multiple return values are
   combined.</p>
 <div class="section">
 <div class="titlepage"><div><div><h3 class="title">
 <a name="id2538454"></a>Signals2</h3></div></div></div>
 <p>This documentation describes a thread-safe variant of the
     original Boost.Signals library.  There have been some changes to
     the interface to support thread-safety, mostly with respect to
     automatic connection management.  This implementation was written by
     Frank Mori Hess.  Acknowledgements are also due to Timmo Stange, Peter
     Dimov, and Gottlob Frege for ideas and feedback, and to Douglas Gregor
     for the original version of Boost.Signals this effort was based on.
     </p>
 </div>
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"><p><small>Last revised: June 12, 2007 at 14:01:23 -0400</small></p></td>
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	<div><h2 class="title">
	<a name="signals2"></a>Chapter 19. Boost.Signals2</h2></div>
	<div><div class="author"><h3 class="author">
	<span class="firstname">Douglas</span> <span class="surname">Gregor</span>
	</h3></div></div>
	<div><div class="author"><h3 class="author">
	<span class="firstname">Frank</span> <span class="othername">Mori</span> <span class="surname">Hess</span>
	</h3></div></div>
	<div><p class="copyright">Copyright © 2001-2004 Douglas Gregor</p></div>
	<div><p class="copyright">Copyright © 2007-2009 Frank Mori Hess</p></div>
	<div><div class="legalnotice">
	<a name="id2538393"></a><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></div>
	</div></div>
	<div class="toc">
	<p><b>Table of Contents</b></p>
	<dl>
	<dt><span class="section"><a href="signals2.html#id2538417">Introduction</a></span></dt>
	<dd><dl><dt><span class="section"><a href="signals2.html#id2538454">Signals2</a></span></dt></dl></dd>
	<dt><span class="section"><a href="signals2/tutorial.html">Tutorial</a></span></dt>
	<dd><dl>
	<dt><span class="section"><a href="signals2/tutorial.html#id2538487">How to Read this Tutorial</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#id2538550">Hello, World! (Beginner)</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#id2538616">Calling Multiple Slots</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#id2538877">Passing Values to and from Slots</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#id2539307">Connection Management</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.document-view">Example: Document-View</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.extended-slot-type">Giving a Slot Access to its Connection (Advanced)</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.signal-mutex-template-parameter">Changing the <code class="computeroutput">Mutex</code> Type of a Signal (Advanced).</a></span></dt>
	<dt><span class="section"><a href="signals2/tutorial.html#id2540629">Linking against the Signals2 library</a></span></dt>
	</dl></dd>
	<dt><span class="section"><a href="signals2/examples.html">Example programs</a></span></dt>
	<dd><dl>
	<dt><span class="section"><a href="signals2/examples.html#signals2.examples.misc">Miscellaneous Tutorial Examples</a></span></dt>
	<dt><span class="section"><a href="signals2/examples.html#signals2.examples.document-view">Document-View</a></span></dt>
	<dt><span class="section"><a href="signals2/examples.html#signals2.examples.deconstruct">Postconstructors and Predestructors with <code class="computeroutput">deconstruct()</code></a></span></dt>
	</dl></dd>
	<dt><span class="section"><a href="signals2/reference.html">Reference</a></span></dt>
	<dd><dl>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2_hpp">Header <boost/signals2.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.connection_hpp">Header <boost/signals2/connection.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.deconstruct_hpp">Header <boost/signals2/deconstruct.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.dummy_mutex_hpp">Header <boost/signals2/dummy_mutex.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.last_value_hpp">Header <boost/signals2/last_value.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.mutex_hpp">Header <boost/signals2/mutex.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.optional_last_value_hpp">Header <boost/signals2/optional_last_value.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.shared_connection_block_hpp">Header <boost/signals2/shared_connection_block.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_hpp">Header <boost/signals2/signal.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_base_hpp">Header <boost/signals2/signal_base.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_type_hpp">Header <boost/signals2/signal_type.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.slot_hpp">Header <boost/signals2/slot.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.slot_base_hpp">Header <boost/signals2/slot_base.hpp></a></span></dt>
	<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.trackable_hpp">Header <boost/signals2/trackable.hpp></a></span></dt>
	</dl></dd>
	<dt><span class="section"><a href="signals2/thread-safety.html">Thread-Safety</a></span></dt>
	<dd><dl>
	<dt><span class="section"><a href="signals2/thread-safety.html#id2564768">Introduction</a></span></dt>
	<dt><span class="section"><a href="signals2/thread-safety.html#id2564825">Signals and combiners</a></span></dt>
	<dt><span class="section"><a href="signals2/thread-safety.html#id2564989">Connections and other classes</a></span></dt>
	</dl></dd>
	<dt><span class="section"><a href="signals2/faq.html">Frequently Asked Questions</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html">Design Rationale</a></span></dt>
	<dd><dl>
	<dt><span class="section"><a href="signals2/rationale.html#id2565329">User-level Connection Management</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html#id2565501">Automatic Connection Management</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html#id2565661"><code class="computeroutput">optional_last_value</code> as the Default Combiner</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html#id2565721">Combiner Interface</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html#id2565802">Connection Interfaces: += operator</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html#id2565973">Signals2 Mutex Classes</a></span></dt>
	<dt><span class="section"><a href="signals2/rationale.html#id2566068">Comparison with other Signal/Slot implementations</a></span></dt>
	</dl></dd>
	<dt><span class="section"><a href="signals2/api_changes.html">Signals2 API Changes</a></span></dt>
	<dd><dl>
	<dt><span class="section"><a href="signals2/api_changes.html#signals2.porting">Porting from Boost.Signals to Boost.Signals2</a></span></dt>
	<dt><span class="section"><a href="signals2/api_changes.html#signals2.api_history">Signals2 API Development</a></span></dt>
	</dl></dd>
	<dt><span class="section"><a href="signals2/tests.html">Testsuite</a></span></dt>
	<dd><dl><dt><span class="section"><a href="signals2/tests.html#id2567366">Acceptance tests</a></span></dt></dl></dd>
	</dl>
	</div>
	<div class="section">
	<div class="titlepage"><div><div><h2 class="title" style="clear: both">
	<a name="id2538417"></a>Introduction</h2></div></div></div>
	<div class="toc"><dl><dt><span class="section"><a href="signals2.html#id2538454">Signals2</a></span></dt></dl></div>
	<p>The Boost.Signals2 library is an implementation of a managed
	signals and slots system. Signals represent callbacks with multiple
	targets, and are also called publishers or events in similar
	systems. Signals are connected to some set of slots, which are
	callback receivers (also called event targets or subscribers), which
	are called when the signal is "emitted."</p>
	<p>Signals and slots are managed, in that signals and slots (or,
	more properly, objects that occur as part of the slots) can track
	connections and are capable of automatically disconnecting signal/slot
	connections when either is destroyed. This enables the user to make
	signal/slot connections without expending a great effort to manage the
	lifetimes of those connections with regard to the lifetimes of all
	objects involved.</p>
	<p>When signals are connected to multiple slots, there is a
	question regarding the relationship between the return values of the
	slots and the return value of the signals. Boost.Signals2 allows the
	user to specify the manner in which multiple return values are
	combined.</p>
	<div class="section">
	<div class="titlepage"><div><div><h3 class="title">
	<a name="id2538454"></a>Signals2</h3></div></div></div>
	<p>This documentation describes a thread-safe variant of the
	original Boost.Signals library. There have been some changes to
	the interface to support thread-safety, mostly with respect to
	automatic connection management. This implementation was written by
	Frank Mori Hess. Acknowledgements are also due to Timmo Stange, Peter
	Dimov, and Gottlob Frege for ideas and feedback, and to Douglas Gregor
	for the original version of Boost.Signals this effort was based on.
	</p>
	</div>
	</div>
	</div>
	<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
	<td align="left"><p><small>Last revised: June 12, 2007 at 14:01:23 -0400</small></p></td>
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