| <html> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> |
| <title>Chapter 20. Boost.Signals</title> |
| <link rel="stylesheet" href="../../doc/src/boostbook.css" type="text/css"> |
| <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> |
| <link rel="home" href="index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> |
| <link rel="up" href="libraries.html" title="Part I. The Boost C++ Libraries (BoostBook Subset)"> |
| <link rel="prev" href="ref/ack.html" title="Acknowledgements"> |
| <link rel="next" href="signals/tutorial.html" title="Tutorial"> |
| </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 align="center"><a href="../../index.html">Home</a></td> |
| <td align="center"><a href="../../libs/libraries.htm">Libraries</a></td> |
| <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> |
| <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> |
| <td align="center"><a href="../../more/index.htm">More</a></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="ref/ack.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="libraries.html"><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="signals/tutorial.html"><img src="../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| <div class="chapter"> |
| <div class="titlepage"><div> |
| <div><h2 class="title"> |
| <a name="signals"></a>Chapter 20. Boost.Signals</h2></div> |
| <div><div class="author"><h3 class="author"> |
| <span class="firstname">Douglas</span> <span class="surname">Gregor</span> |
| </h3></div></div> |
| <div><p class="copyright">Copyright © 2001-2004 Douglas Gregor</p></div> |
| <div><div class="legalnotice"> |
| <a name="id2849916"></a><p>Use, modification and distribution is subject to 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="signals.html#id2849941">Introduction</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html">Tutorial</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="signals/tutorial.html#id2849991">How to Read this Tutorial</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2850054">Compatibility Note</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2850167">Hello, World! (Beginner)</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2850322">Calling multiple slots</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2850736">Passing values to and from slots</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2851651">Connection Management</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2852417">Example: Document-View</a></span></dt> |
| <dt><span class="section"><a href="signals/tutorial.html#id2852545">Linking against the Signals library</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="signals/reference.html">Reference</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="signals/reference.html#header.boost.signal_hpp">Header <boost/signal.hpp></a></span></dt> |
| <dt><span class="section"><a href="signals/reference.html#header.boost.signals.slot_hpp">Header <boost/signals/slot.hpp></a></span></dt> |
| <dt><span class="section"><a href="signals/reference.html#header.boost.signals.trackable_hpp">Header <boost/signals/trackable.hpp></a></span></dt> |
| <dt><span class="section"><a href="signals/reference.html#header.boost.signals.connection_hpp">Header <boost/signals/connection.hpp></a></span></dt> |
| <dt><span class="section"><a href="signals/reference.html#header.boost.visit_each_hpp">Header <boost/visit_each.hpp></a></span></dt> |
| <dt><span class="section"><a href="signals/reference.html#header.boost.last_value_hpp">Header <boost/last_value.hpp></a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="signals/s04.html">Frequently Asked Questions</a></span></dt> |
| <dt><span class="section"><a href="signals/s05.html">Design Overview</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="signals/s05.html#id2861644">Type Erasure</a></span></dt> |
| <dt><span class="section"><a href="signals/s05.html#id2861714"><code class="computeroutput">connection</code> class</a></span></dt> |
| <dt><span class="section"><a href="signals/s05.html#id2861832">Slot Call Iterator</a></span></dt> |
| <dt><span class="section"><a href="signals/s05.html#id2862030"><code class="computeroutput">visit_each</code> function template</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="signals/s06.html">Design Rationale</a></span></dt> |
| <dd><dl> |
| <dt><span class="section"><a href="signals/s06.html#id2862186">Choice of Slot Definitions</a></span></dt> |
| <dt><span class="section"><a href="signals/s06.html#id2862270">User-level Connection Management</a></span></dt> |
| <dt><span class="section"><a href="signals/s06.html#id2862436">Combiner Interface</a></span></dt> |
| <dt><span class="section"><a href="signals/s06.html#id2862516">Connection Interfaces: += operator</a></span></dt> |
| <dt><span class="section"><a href="signals/s06.html#id2862687"><code class="computeroutput">trackable</code> rationale</a></span></dt> |
| <dt><span class="section"><a href="signals/s06.html#id2862870">Comparison with other Signal/Slot implementations</a></span></dt> |
| </dl></dd> |
| <dt><span class="section"><a href="signals/tests.html">Testsuite</a></span></dt> |
| <dd><dl><dt><span class="section"><a href="signals/tests.html#id2862992">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="id2849941"></a>Introduction</h2></div></div></div> |
| <p>The Boost.Signals 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) track all |
| 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.Signals allows the |
| user to specify the manner in which multiple return values are |
| combined.</p> |
| </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: May 04, 2004 at 19:17:23 +0100</small></p></td> |
| <td align="right"><div class="copyright-footer"></div></td> |
| </tr></table> |
| <hr> |
| <div class="spirit-nav"> |
| <a accesskey="p" href="ref/ack.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="libraries.html"><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="signals/tutorial.html"><img src="../../doc/src/images/next.png" alt="Next"></a> |
| </div> |
| </body> |
| </html> |