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<div class="titlepage"><div>
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<div><h2 class="title">
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<a name="signals2"></a>Chapter 36. Boost.Signals2</h2></div>
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<div><div class="author"><h3 class="author">
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<span class="firstname">Douglas</span> <span class="surname">Gregor</span>
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</h3></div></div>
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<div><div class="author"><h3 class="author">
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<span class="firstname">Frank</span> <span class="othername">Mori</span> <span class="surname">Hess</span>
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</h3></div></div>
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<div><p class="copyright">Copyright © 2001-2004 Douglas Gregor</p></div>
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<div><p class="copyright">Copyright © 2007-2009 Frank Mori Hess</p></div>
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<div><div class="legalnotice">
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<a name="id-1.3.37.1.5"></a><p>Distributed under the Boost
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Software License, Version 1.0. (See accompanying file
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<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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<div class="toc">
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<p><b>Table of Contents</b></p>
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<dl class="toc">
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<dt><span class="section"><a href="signals2.html#id-1.3.37.3">Introduction</a></span></dt>
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<dd><dl><dt><span class="section"><a href="signals2.html#id-1.3.37.3.5">Signals2</a></span></dt></dl></dd>
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<dt><span class="section"><a href="signals2/tutorial.html">Tutorial</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="signals2/tutorial.html#id-1.3.37.4.2">How to Read this Tutorial</a></span></dt>
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<dt><span class="section"><a href="signals2/tutorial.html#id-1.3.37.4.3">Hello, World! (Beginner)</a></span></dt>
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<dt><span class="section"><a href="signals2/tutorial.html#id-1.3.37.4.4">Calling Multiple Slots</a></span></dt>
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<dt><span class="section"><a href="signals2/tutorial.html#id-1.3.37.4.5">Passing Values to and from Slots</a></span></dt>
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<dt><span class="section"><a href="signals2/tutorial.html#id-1.3.37.4.6">Connection Management</a></span></dt>
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<dt><span class="section"><a href="signals2/tutorial.html#signals2.tutorial.document-view">Example: Document-View</a></span></dt>
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<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>
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<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>
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<dt><span class="section"><a href="signals2/tutorial.html#id-1.3.37.4.10">Linking against the Signals2 library</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="signals2/examples.html">Example programs</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="signals2/examples.html#signals2.examples.misc">Miscellaneous Tutorial Examples</a></span></dt>
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<dt><span class="section"><a href="signals2/examples.html#signals2.examples.document-view">Document-View</a></span></dt>
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<dt><span class="section"><a href="signals2/examples.html#signals2.examples.deconstruct">Postconstructors and Predestructors with <code class="computeroutput">deconstruct()</code></a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="signals2/reference.html">Reference</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2_hpp">Header <boost/signals2.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.connection_hpp">Header <boost/signals2/connection.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.deconstruct_hpp">Header <boost/signals2/deconstruct.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.dummy_mutex_hpp">Header <boost/signals2/dummy_mutex.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.last_value_hpp">Header <boost/signals2/last_value.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.mutex_hpp">Header <boost/signals2/mutex.hpp></a></span></dt>
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<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>
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<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>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_hpp">Header <boost/signals2/signal.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_base_hpp">Header <boost/signals2/signal_base.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.signal_type_hpp">Header <boost/signals2/signal_type.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.slot_hpp">Header <boost/signals2/slot.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.slot_base_hpp">Header <boost/signals2/slot_base.hpp></a></span></dt>
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<dt><span class="section"><a href="signals2/reference.html#header.boost.signals2.trackable_hpp">Header <boost/signals2/trackable.hpp></a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="signals2/thread-safety.html">Thread-Safety</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="signals2/thread-safety.html#id-1.3.37.7.2">Introduction</a></span></dt>
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<dt><span class="section"><a href="signals2/thread-safety.html#id-1.3.37.7.3">Signals and combiners</a></span></dt>
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<dt><span class="section"><a href="signals2/thread-safety.html#id-1.3.37.7.4">Connections and other classes</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="signals2/faq.html">Frequently Asked Questions</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html">Design Rationale</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.2">User-level Connection Management</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.3">Automatic Connection Management</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.4"><code class="computeroutput">optional_last_value</code> as the Default Combiner</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.5">Combiner Interface</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.6">Connection Interfaces: += operator</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.7">Signals2 Mutex Classes</a></span></dt>
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<dt><span class="section"><a href="signals2/rationale.html#id-1.3.37.9.8">Comparison with other Signal/Slot implementations</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="signals2/api_changes.html">Signals2 API Changes</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="signals2/api_changes.html#signals2.porting">Porting from Boost.Signals to Boost.Signals2</a></span></dt>
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<dt><span class="section"><a href="signals2/api_changes.html#signals2.api_history">Signals2 API Development</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="signals2/tests.html">Testsuite</a></span></dt>
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<dd><dl><dt><span class="section"><a href="signals2/tests.html#id-1.3.37.11.2">Acceptance tests</a></span></dt></dl></dd>
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</dl>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="id-1.3.37.3"></a>Introduction</h2></div></div></div>
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<div class="toc"><dl class="toc"><dt><span class="section"><a href="signals2.html#id-1.3.37.3.5">Signals2</a></span></dt></dl></div>
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<p>The Boost.Signals2 library is an implementation of a managed
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signals and slots system. Signals represent callbacks with multiple
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targets, and are also called publishers or events in similar
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systems. Signals are connected to some set of slots, which are
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callback receivers (also called event targets or subscribers), which
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are called when the signal is "emitted."</p>
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<p>Signals and slots are managed, in that signals and slots (or,
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more properly, objects that occur as part of the slots) can track
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connections and are capable of automatically disconnecting signal/slot
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connections when either is destroyed. This enables the user to make
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signal/slot connections without expending a great effort to manage the
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lifetimes of those connections with regard to the lifetimes of all
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objects involved.</p>
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<p>When signals are connected to multiple slots, there is a
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question regarding the relationship between the return values of the
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slots and the return value of the signals. Boost.Signals2 allows the
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user to specify the manner in which multiple return values are
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combined.</p>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="id-1.3.37.3.5"></a>Signals2</h3></div></div></div>
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<p>This documentation describes a thread-safe variant of the
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original Boost.Signals library. There have been some changes to
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the interface to support thread-safety, mostly with respect to
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automatic connection management. This implementation was written by
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Frank Mori Hess. Acknowledgements are also due to Timmo Stange, Peter
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Dimov, and Tony Van Eerd for ideas and feedback, and to Douglas Gregor
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for the original version of Boost.Signals this effort was based on.
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</p>
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</div>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"><p><small>Last revised: June 12, 2007 at 14:01:23 -0400</small></p></td>
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