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1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 4<title>Lazy Statements</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="lazy_operators.html" title="Lazy Operators"> 10<link rel="next" href="construct__new__delete__casts.html" title="Construct, New, Delete, Casts"> 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="lazy_operators.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="construct__new__delete__casts.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.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<div class="titlepage"></div> 54<p> 55 <span class="inlinemediaobject"><img src="../../images/tip.png" alt="tip"></span> Learn more about statements <a class="link" href="../modules/statement.html" title="Statement">here.</a> 56 </p> 57</div> 58</div> 59<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 60<td align="left"></td> 61<td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010 Joel de Guzman, Dan Marsden, Thomas Heller<p> 62 Distributed under the Boost Software License, Version 1.0. (See accompanying 63 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>) 64 </p> 65</div></td> 66</tr></table> 67<hr> 68<div class="spirit-nav"> 69<a accesskey="p" href="lazy_operators.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="construct__new__delete__casts.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 70</div> 71</body> 72</html>