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| 4 | <title>Lazy Statements</title> | |
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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.lazy_statements"></a><a class="link" href="lazy_statements.html" title="Lazy Statements">Lazy Statements</a> | |
| 28 | </h3></div></div></div> | |
| 29 | <p> | |
| 30 | Lazy statements? Sure. There are lazy versions of the C++ statements we all | |
| 31 | know and love. For example: | |
| 32 | </p> | |
| 33 | <pre class="programlisting"><span class="identifier">if_</span><span class="special">(</span><span class="identifier">arg1</span> <span class="special">></span> <span class="number">5</span><span class="special">)</span> | |
| 34 | <span class="special">[</span> | |
| 35 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">arg1</span> | |
| 36 | <span class="special">]</span> | |
| 37 | </pre> | |
| 38 | <p> | |
| 39 | Say, for example, we wish to print all the elements that are greater than | |
| 40 | 5 (separated by a comma) in a vector. Here's how we write it: | |
| 41 | </p> | |
| 42 | <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">for_each</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> | |
| 43 | <span class="identifier">if_</span><span class="special">(</span><span class="identifier">arg1</span> <span class="special">></span> <span class="number">5</span><span class="special">)</span> | |
| 44 | <span class="special">[</span> | |
| 45 | <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="string">", "</span> | |
| 46 | <span class="special">]</span> | |
| 47 | <span class="special">);</span> | |
| 48 | </pre> | |
| 49 | <p> | |
| 50 | (See <a href="../../../../example/if.cpp" target="_top">if.cpp</a>) | |
| 51 | </p> | |
| 52 | <div class="sidebar"> | |
| 53 | <p class="title"><b></b></p> | |
| 54 | <p> | |
| 55 | <span class="inlinemediaobject"><img src="../../images/tip.png"></span> | |
| 56 | Learn more about statements <a class="link" href="../modules/statement.html" title="Statement">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, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas | |
| 63 | Heller, John Fletcher<p> | |
| 64 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 65 | 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>) | |
| 66 | </p> | |
| 67 | </div></td> | |
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| 72 | </div> | |
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