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| <div><h2 class="title"> |
| <a name="signals2"></a>Chapter 21. 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="id2863250"></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#id2863274">Introduction</a></span></dt> |
| <dd><dl><dt><span class="section"><a href="signals2.html#id2863311">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#id2863343">How to Read this Tutorial</a></span></dt> |
| <dt><span class="section"><a href="signals2/tutorial.html#id2863406">Hello, World! (Beginner)</a></span></dt> |
| <dt><span class="section"><a href="signals2/tutorial.html#id2863472">Calling Multiple Slots</a></span></dt> |
| <dt><span class="section"><a href="signals2/tutorial.html#id2863733">Passing Values to and from Slots</a></span></dt> |
| <dt><span class="section"><a href="signals2/tutorial.html#id2864164">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#id2865485">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#id2889901">Introduction</a></span></dt> |
| <dt><span class="section"><a href="signals2/thread-safety.html#id2889958">Signals and combiners</a></span></dt> |
| <dt><span class="section"><a href="signals2/thread-safety.html#id2890122">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#id2890462">User-level Connection Management</a></span></dt> |
| <dt><span class="section"><a href="signals2/rationale.html#id2890634">Automatic Connection Management</a></span></dt> |
| <dt><span class="section"><a href="signals2/rationale.html#id2890794"><code class="computeroutput">optional_last_value</code> as the Default Combiner</a></span></dt> |
| <dt><span class="section"><a href="signals2/rationale.html#id2890854">Combiner Interface</a></span></dt> |
| <dt><span class="section"><a href="signals2/rationale.html#id2890935">Connection Interfaces: += operator</a></span></dt> |
| <dt><span class="section"><a href="signals2/rationale.html#id2891106">Signals2 Mutex Classes</a></span></dt> |
| <dt><span class="section"><a href="signals2/rationale.html#id2891200">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#id2892498">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="id2863274"></a>Introduction</h2></div></div></div> |
| <div class="toc"><dl><dt><span class="section"><a href="signals2.html#id2863311">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="id2863311"></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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