1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 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 V1.79.1"> 7<link rel="home" href="../../index.html" title="Chapter 1. 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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="blurb"> 53<div class="titlepage"><div><div><p class="title"><b></b></p></div></div></div> 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> 68</tr></table> 69<hr> 70<div class="spirit-nav"> 71<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> 72</div> 73</body> 74</html> 75
