-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Signals with parameters</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><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="ch02s02.html" title="Using a member function"><link rel="next" href="ch02s04.html" title="Disconnecting"></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">Signals with parameters</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s02.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="ch02s04.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idm4
6158099503840"></a>Signals with parameters</h2></div></div></div><p>Functions taking no parameters and returning void are quite useful,
+<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Signals with parameters</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><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="ch02s02.html" title="Using a member function"><link rel="next" href="ch02s04.html" title="Disconnecting"></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">Signals with parameters</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s02.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="ch02s04.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idm4
5801113077280"></a>Signals with parameters</h2></div></div></div><p>Functions taking no parameters and returning void are quite useful,
especially when they're members of classes that can store unlimited amounts of
safely typed data, but they're not sufficient for everything.</p><p>What if aliens don't land in the carpark, but somewhere else? Let's modify
the example so that the callback function takes a <code class="literal">std::string</code> with the location
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