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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Using a member function</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="LibSigC++" /><link rel="up" href="ch02.html" title="Chapter 2. Connecting your code to signals" /><link rel="prev" href="ch02.html" title="Chapter 2. Connecting your code to signals" /><link rel="next" href="ch02s03.html" title="Signals with parameters" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Using a member function</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Connecting your code to signals</th><td width="20%" align="right"> <a accesskey="n" href="ch02s03.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Using a member function"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="id3046875"></a>Using a member function</h2></div></div></div><p>Suppose you found a more sophisticated alien alerter class on the web,
such as this:</p><pre class="programlisting">
class AlienAlerter : public SigC::Object
{
public:
AlienAlerter(char const* servername);
void alert();
private:
// ...
};
</pre><p>(Handily it derives from <code class="literal">SigC::Object</code> already. This isn't quite so
unlikely as you might think; all appropriate bits of the popular gtkmm library do so,
for example.)</p><p>You could rewrite your code as follows:</p><pre class="programlisting">
int main()
{
AlienDetector mydetector;
AlienAlerter myalerter("localhost"); // added
mydetector.detected.connect( SigC::slot(myalerter, &AlienAlerter::alert) ); // changed
mydetector.run();
return 0;
}
</pre><p>Note that only 2 lines are different - one to create an instance of the
class, and the line to connect the method to the signal.</p><p>This code is in example2.cc, which can be compiled in the same way as
example1.cc</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch02s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 2. Connecting your code to signals </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Signals with parameters</td></tr></table></div></body></html>
