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In practice, the whole folder has been removed and replaced by a fresh copy of libsigc++-2.2.3 from here: http://repository.timesys.com/buildsources/l/libsigc++/libsigc++-2.2.3/
34 lines
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34 lines
3.9 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 2. Connecting your code to signals</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="LibSigC++"><link rel="up" href="index.html" title="LibSigC++"><link rel="prev" href="ch01.html" title="Chapter 1. Introduction"><link rel="next" href="ch02s02.html" title="Using a member function"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 2. Connecting your code to signals</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch01.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch02s02.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="sec-connecting"></a>Chapter 2. Connecting your code to signals</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="ch02.html#id2521776">A simple example</a></span></dt><dt><span class="sect1"><a href="ch02s02.html">Using a member function</a></span></dt><dt><span class="sect1"><a href="ch02s03.html">Signals with parameters</a></span></dt><dt><span class="sect1"><a href="ch02s04.html">Disconnecting</a></span></dt></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2521776"></a>A simple example</h2></div></div></div><p>So to get some experience, lets look at a simple example...</p><p>Lets say you and I are writing an application which informs the user when
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aliens land in the car park. To keep the design nice and clean, and allow for
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maximum portability to different interfaces, we decide to use LibSigC++ to
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split the project in two parts.</p><p>I will write the <code class="literal">AlienDetector</code> class, and you will write the code to inform
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the user. (Well, OK, I'll write both, but we're pretending, remember?)</p><p>Here's my class:</p><pre class="programlisting">
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class AlienDetector
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{
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public:
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AlienDetector();
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void run();
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sigc::signal<void> signal_detected;
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};
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</pre><p>(I'll explain the type of signal_detected later.)</p><p>Here's your code that uses it:</p><pre class="programlisting">
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void warn_people()
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{
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cout << "There are aliens in the carpark!" << endl;
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}
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int main()
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{
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AlienDetector mydetector;
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mydetector.signal_detected.connect( sigc::ptr_fun(warn_people) );
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mydetector.run();
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return 0;
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}
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</pre><p>Pretty simple really - you call the <code class="literal">connect()</code> method on the signal to
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connect your function. <code class="literal">connect()</code> takes a <code class="literal">slot</code> parameter (remember slots
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are capable of holding any type of callback), so you convert your
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<code class="literal">warn_people()</code> function to a slot using the <code class="literal">slot()</code> function.</p><p>To compile this example from the downloadable example code, use:</p><pre class="programlisting">g++ example1.cc -o eg1 `pkg-config --cflags --libs sigc++-2.0`</pre><p>Note that those `` characters are backticks, not single quotes. Run it with</p><pre class="programlisting">./eg1</pre><p>(Try not to panic when the aliens land!)</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch01.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ch02s02.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 1. Introduction </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Using a member function</td></tr></table></div></body></html>
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