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| 24 | </div> | |
| 25 | <div class="section"> | |
| 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> | |
| 28 | </h3></div></div></div> | |
| 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</span> | |
| 40 | <span class="identifier">arg2</span> <span class="comment">// two-or-more argument function that returns its second argument</span> | |
| 41 | <span class="identifier">arg3</span> <span class="comment">// three-or-more argument function that returns its third argument</span> | |
| 42 | </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"><<</span> <span class="identifier">arg1</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// prints 3</span> | |
| 50 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</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"><<</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"</span> | |
| 51 | </pre> | |
| 52 | <p> | |
| 53 | (See <a href="../../../../example/arguments.cpp" target="_top">arguments.cpp</a>) | |
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| 56 | <p class="title"><b></b></p> | |
| 57 | <p> | |
| 58 | <span class="inlinemediaobject"><img src="../../images/tip.png"></span> | |
| 59 | Learn more about arguments <a class="link" href="../modules/core/arguments.html" title="Arguments">here.</a> | |
| 60 | </p> | |
| 61 | </div> | |
| 62 | </div> | |
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| 65 | <td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 66 | Heller, John Fletcher<p> | |
| 67 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 68 | 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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