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<div class="title">Working with multiple locales </div>  </div>
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<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>
<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>
<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>
<p>For example:</p>
<div class="fragment"><div class="line">generator gen;</div>
<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>
<div class="line">gen(<span class="stringliteral">&quot;en_US.UTF-8&quot;</span>);</div>
<div class="line">gen(<span class="stringliteral">&quot;de_DE.UTF-8&quot;</span>);</div>
<div class="line">gen(<span class="stringliteral">&quot;ja_JP.UTF-8&quot;</span>);</div>
<div class="line"><span class="comment">// Create all locales</span></div>
<div class="line"></div>
<div class="line">std::locale en=gen(<span class="stringliteral">&quot;en_US.UTF-8&quot;</span>); </div>
<div class="line"><span class="comment">// Fetch an existing locale from the cache</span></div>
<div class="line">std::locale ar=gen(<span class="stringliteral">&quot;ar_EG.UTF-8&quot;</span>);</div>
<div class="line"><span class="comment">// Because ar_EG not in the cache, a new locale is generated (and cached)</span></div>
</div><!-- fragment --><p>Then these locales can be imbued to <code>iostreams</code> or used directly as parameters to various functions. </p>
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