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26<div class="titlepage"><div><div><h3 class="title">
27<a name="phoenix.starter_kit.arguments"></a><a class="link" href="arguments.html" title="Arguments">Arguments</a>
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29<p>
30        Arguments are also functions? You bet!
31      </p>
32<p>
33        Until now, we have been dealing with expressions returning a nullary function.
34        Arguments, on the other hand, evaluate to an N-ary function. An argument
35        represents the Nth argument. There are a few predefined arguments arg1, arg2,
36        arg3, arg4 and so on (and it's <a href="http://www.boost.org/libs/lambda/doc/index.html" target="_top">BLL</a>
37        counterparts: _1, _2, _3, _4 and so on). Examples:
38      </p>
39<pre class="programlisting"><span class="identifier">arg1</span> <span class="comment">// one-or-more argument function that returns its first argument
40</span><span class="identifier">arg2</span> <span class="comment">// two-or-more argument function that returns its second argument
41</span><span class="identifier">arg3</span> <span class="comment">// three-or-more argument function that returns its third argument
42</span></pre>
43<p>
44        <code class="computeroutput"><span class="identifier">argN</span></code> returns the Nth argument.
45        Examples:
46      </p>
47<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>
48<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>
49<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">arg1</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>        <span class="comment">// prints 3
50</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">arg2</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">s</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>     <span class="comment">// prints "Hello World"
51</span></pre>
52<p>
53        (See <a href="../../../../example/arguments.cpp" target="_top">arguments.cpp</a>)
54      </p>
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57<p>
58        <span class="inlinemediaobject"><img src="../../images/tip.png" alt="tip"></span> Learn more about arguments <a class="link" href="../modules/core/arguments.html" title="Arguments">here.</a>
59      </p>
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64<td align="right"><div class="copyright-footer">Copyright &#169; 2002-2005, 2010 Joel de Guzman, Dan Marsden, Thomas Heller<p>
65        Distributed under the Boost Software License, Version 1.0. (See accompanying
66        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>)
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