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1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 4<title>References</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> 7<link rel="home" href="../../index.html" title="Chapter 1. Phoenix 3.0"> 8<link rel="up" href="../starter_kit.html" title="Starter Kit"> 9<link rel="prev" href="values.html" title="Values"> 10<link rel="next" href="arguments.html" title="Arguments"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="values.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../starter_kit.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="arguments.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h3 class="title"> 27<a name="phoenix.starter_kit.references"></a><a class="link" href="references.html" title="References">References</a> 28</h3></div></div></div> 29<p> 30 References are functions. They hold a reference to a value stored somewhere. 31 For example, given: 32 </p> 33<pre class="programlisting"><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">3</span><span class="special">;</span> 34<span class="keyword">char</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">s</span> <span class="special">=</span> <span class="string">"Hello World"</span><span class="special">;</span> 35</pre> 36<p> 37 we create <code class="computeroutput"><span class="identifier">references</span></code> to 38 <code class="computeroutput"><span class="identifier">i</span></code> and <code class="computeroutput"><span class="identifier">s</span></code> 39 this way: 40 </p> 41<pre class="programlisting"><span class="identifier">ref</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> 42<span class="identifier">ref</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span> 43</pre> 44<p> 45 Like <code class="computeroutput"><span class="identifier">val</span></code>, the expressions 46 above evaluates to a nullary function; the first one returning an <code class="computeroutput"><span class="keyword">int</span><span class="special">&</span></code>, 47 and the second one returning a <code class="computeroutput"><span class="keyword">char</span> 48 <span class="keyword">const</span><span class="special">*&</span></code>. 49 </p> 50<p> 51 (See <a href="../../../../example/references.cpp" target="_top">references.cpp</a>) 52 </p> 53<div class="sidebar"> 54<div class="titlepage"></div> 55<p> 56 <span class="inlinemediaobject"><img src="../../images/tip.png" alt="tip"></span> Learn more about references <a class="link" href="../modules/core/references.html" title="References">here.</a> 57 </p> 58</div> 59</div> 60<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 61<td align="left"></td> 62<td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010 Joel de Guzman, Dan Marsden, Thomas Heller<p> 63 Distributed under the Boost Software License, Version 1.0. (See accompanying 64 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 65 </p> 66</div></td> 67</tr></table> 68<hr> 69<div class="spirit-nav"> 70<a accesskey="p" href="values.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../starter_kit.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="arguments.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 71</div> 72</body> 73</html>