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4<title>Chapter 12. Boost.Signals</title>
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25<div class="chapter" lang="en">
26<div class="titlepage"><div>
27<div><h2 class="title">
28<a name="signals"></a>Chapter 12. Boost.Signals</h2></div>
29<div><div class="author"><h3 class="author">
30<span class="firstname">Douglas</span> <span class="surname">Gregor</span>
31</h3></div></div>
32<div><p class="copyright">Copyright © 2001-2004 Douglas Gregor</p></div>
33<div><div class="legalnotice">
34<a name="id1625852"></a><p>Use, modification and distribution is subject to the Boost
35    Software License, Version 1.0. (See accompanying file
36    <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>
37</div></div>
38</div></div>
39<div class="toc">
40<p><b>Table of Contents</b></p>
41<dl>
42<dt><span class="section"><a href="signals.html#id1625877">Introduction</a></span></dt>
43<dt><span class="section"><a href="signals/tutorial.html">Tutorial</a></span></dt>
44<dd><dl>
45<dt><span class="section"><a href="signals/tutorial.html#id1625926">How to Read this Tutorial</a></span></dt>
46<dt><span class="section"><a href="signals/tutorial.html#id1625989">Compatibility Note</a></span></dt>
47<dt><span class="section"><a href="signals/tutorial.html#id1626102">Hello, World! (Beginner)</a></span></dt>
48<dt><span class="section"><a href="signals/tutorial.html#id1626257">Calling multiple slots</a></span></dt>
49<dt><span class="section"><a href="signals/tutorial.html#id1626670">Passing values to and from slots</a></span></dt>
50<dt><span class="section"><a href="signals/tutorial.html#id1627585">Connection Management</a></span></dt>
51<dt><span class="section"><a href="signals/tutorial.html#id1628358">Example: Document-View</a></span></dt>
52<dt><span class="section"><a href="signals/tutorial.html#id1628486">Linking against the Signals library</a></span></dt>
53</dl></dd>
54<dt><span class="section"><a href="signals/reference.html">Reference</a></span></dt>
55<dd><dl>
56<dt><span class="section"><a href="signals/reference.html#header.boost.signal.hpp">Header &lt;boost/signal.hpp&gt;</a></span></dt>
57<dt><span class="section"><a href="signals/reference.html#header.boost.signals.slot.hpp">Header &lt;boost/signals/slot.hpp&gt;</a></span></dt>
58<dt><span class="section"><a href="signals/reference.html#header.boost.signals.trackable.hpp">Header &lt;boost/signals/trackable.hpp&gt;</a></span></dt>
59<dt><span class="section"><a href="signals/reference.html#header.boost.signals.connection.hpp">Header &lt;boost/signals/connection.hpp&gt;</a></span></dt>
60<dt><span class="section"><a href="signals/reference.html#header.boost.visit_each.hpp">Header &lt;boost/visit_each.hpp&gt;</a></span></dt>
61<dt><span class="section"><a href="signals/reference.html#header.boost.last_value.hpp">Header &lt;boost/last_value.hpp&gt;</a></span></dt>
62</dl></dd>
63<dt><span class="section"><a href="signals/s04.html">Frequently Asked Questions</a></span></dt>
64<dt><span class="section"><a href="signals/s05.html">Design Overview</a></span></dt>
65<dd><dl>
66<dt><span class="section"><a href="signals/s05.html#id1633905">Type Erasure</a></span></dt>
67<dt><span class="section"><a href="signals/s05.html#id1633975"><code class="computeroutput">connection</code> class</a></span></dt>
68<dt><span class="section"><a href="signals/s05.html#id1634092">Slot Call Iterator</a></span></dt>
69<dt><span class="section"><a href="signals/s05.html#id1634290"><code class="computeroutput">visit_each</code> function template</a></span></dt>
70</dl></dd>
71<dt><span class="section"><a href="signals/s06.html">Design Rationale</a></span></dt>
72<dd><dl>
73<dt><span class="section"><a href="signals/s06.html#id1634446">Choice of Slot Definitions</a></span></dt>
74<dt><span class="section"><a href="signals/s06.html#id1634530">User-level Connection Management</a></span></dt>
75<dt><span class="section"><a href="signals/s06.html#id1634696">Combiner Interface</a></span></dt>
76<dt><span class="section"><a href="signals/s06.html#id1634776">Connection Interfaces: +=  operator</a></span></dt>
77<dt><span class="section"><a href="signals/s06.html#id1634947"><code class="computeroutput">trackable</code> rationale</a></span></dt>
78<dt><span class="section"><a href="signals/s06.html#id1635130">Comparison with other Signal/Slot implementations</a></span></dt>
79</dl></dd>
80<dt><span class="section"><a href="signals/tests.html">Testsuite</a></span></dt>
81<dd><dl><dt><span class="section"><a href="signals/tests.html#id1635252">Acceptance tests</a></span></dt></dl></dd>
82</dl>
83</div>
84<div class="section" lang="en">
85<div class="titlepage"><div><div><h2 class="title" style="clear: both">
86<a name="id1625877"></a>Introduction</h2></div></div></div>
87<p>The Boost.Signals library is an implementation of a managed
88signals and slots system. Signals represent callbacks with multiple
89targets, and are also called publishers or events in similar
90systems. Signals are connected to some set of slots, which are
91callback receivers (also called event targets or subscribers), which
92are called when the signal is "emitted."</p>
93<p>Signals and slots are managed, in that signals and slots (or,
94more properly, objects that occur as part of the slots) track all
95connections and are capable of automatically disconnecting signal/slot
96connections when either is destroyed. This enables the user to make
97signal/slot connections without expending a great effort to manage the
98lifetimes of those connections with regard to the lifetimes of all
99objects involved.</p>
100<p>When signals are connected to multiple slots, there is a
101question regarding the relationship between the return values of the
102slots and the return value of the signals. Boost.Signals allows the
103user to specify the manner in which multiple return values are
104combined.</p>
105</div>
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108<td align="left"><small><p>Last revised: May 04, 2004 at 18:17:22 GMT</p></small></td>
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