1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2<html xmlns="http://www.w3.org/1999/xhtml"> 3<head> 4<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> 5<meta http-equiv="X-UA-Compatible" content="IE=9"/> 6<meta name="generator" content="Doxygen 1.8.6"/> 7<title>Boost.Locale: Working with multiple locales</title> 8<link href="tabs.css" rel="stylesheet" type="text/css"/> 9<script type="text/javascript" src="jquery.js"></script> 10<script type="text/javascript" src="dynsections.js"></script> 11<link href="navtree.css" rel="stylesheet" type="text/css"/> 12<script type="text/javascript" src="resize.js"></script> 13<script type="text/javascript" src="navtree.js"></script> 14<script type="text/javascript"> 15 $(document).ready(initResizable); 16 $(window).load(resizeHeight); 17</script> 18<link href="doxygen.css" rel="stylesheet" type="text/css" /> 19</head> 20<body> 21<div id="top"><!-- do not remove this div, it is closed by doxygen! --> 22<div id="titlearea"> 23<table cellspacing="0" cellpadding="0"> 24 <tbody> 25 <tr style="height: 56px;"> 26 <td id="projectlogo"><img alt="Logo" src="boost-small.png"/></td> 27 <td style="padding-left: 0.5em;"> 28 <div id="projectname">Boost.Locale 29 </div> 30 </td> 31 </tr> 32 </tbody> 33</table> 34</div> 35<!-- end header part --> 36<!-- Generated by Doxygen 1.8.6 --> 37 <div id="navrow1" class="tabs"> 38 <ul class="tablist"> 39 <li><a href="index.html"><span>Main Page</span></a></li> 40 <li class="current"><a href="pages.html"><span>Related Pages</span></a></li> 41 <li><a href="modules.html"><span>Modules</span></a></li> 42 <li><a href="namespaces.html"><span>Namespaces</span></a></li> 43 <li><a href="annotated.html"><span>Classes</span></a></li> 44 <li><a href="files.html"><span>Files</span></a></li> 45 <li><a href="examples.html"><span>Examples</span></a></li> 46 </ul> 47 </div> 48</div><!-- top --> 49<div id="side-nav" class="ui-resizable side-nav-resizable"> 50 <div id="nav-tree"> 51 <div id="nav-tree-contents"> 52 <div id="nav-sync" class="sync"></div> 53 </div> 54 </div> 55 <div id="splitbar" style="-moz-user-select:none;" 56 class="ui-resizable-handle"> 57 </div> 58</div> 59<script type="text/javascript"> 60$(document).ready(function(){initNavTree('working_with_multiple_locales.html','');}); 61</script> 62<div id="doc-content"> 63<div class="header"> 64 <div class="headertitle"> 65<div class="title">Working with multiple locales </div> </div> 66</div><!--header--> 67<div class="contents"> 68<div class="textblock"><p>Boost.Locale allows you to work safely with multiple locales in the same process. As we mentioned before, the locale generation process is not a cheap one. Thus, when we work with multiple locales and need to switch between them, we recommend that you create all the locales you need when the program starts.</p> 69<p>To simplify this process, the <a class="el" href="classboost_1_1locale_1_1generator.html" title="the major class used for locale generation ">boost::locale::generator</a> class has an option to cache all generated locales. With this option, when you create a locale that was previously generated, it would be fetched from the existing locale set instead. This operation is thread safe.</p> 70<p>This option must be explicitly enabled by calling the <a class="el" href="classboost_1_1locale_1_1generator.html#ac2d152e2803cd96f4acc646943f2df51">locale_cache_enabled</a> member function of <a class="el" href="classboost_1_1locale_1_1generator.html" title="the major class used for locale generation ">boost::locale::generator</a> with <code>true</code> as the parameter.</p> 71<p>For example:</p> 72<div class="fragment"><div class="line">generator gen;</div> 73<div class="line">gen.<a class="code" href="classboost_1_1locale_1_1generator.html#ac2d152e2803cd96f4acc646943f2df51">locale_cache_enabled</a>(<span class="keyword">true</span>);</div> 74<div class="line">gen(<span class="stringliteral">"en_US.UTF-8"</span>);</div> 75<div class="line">gen(<span class="stringliteral">"de_DE.UTF-8"</span>);</div> 76<div class="line">gen(<span class="stringliteral">"ja_JP.UTF-8"</span>);</div> 77<div class="line"><span class="comment">// Create all locales</span></div> 78<div class="line"></div> 79<div class="line">std::locale en=gen(<span class="stringliteral">"en_US.UTF-8"</span>); </div> 80<div class="line"><span class="comment">// Fetch an existing locale from the cache</span></div> 81<div class="line">std::locale ar=gen(<span class="stringliteral">"ar_EG.UTF-8"</span>);</div> 82<div class="line"><span class="comment">// Because ar_EG not in the cache, a new locale is generated (and cached)</span></div> 83</div><!-- fragment --><p>Then these locales can be imbued to <code>iostreams</code> or used directly as parameters to various functions. </p> 84</div></div><!-- contents --> 85</div><!-- doc-content --> 86 87 <li class="footer"> 88© Copyright 2009-2012 Artyom Beilis, Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License</a>, Version 1.0. 89 </li> 90 </ul> 91 </div> 92</body> 93</html> 94
