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| <li><a class="anchor" id="faq_bad_cast"></a><b>I try to use some Boost.Locale functions and I get an <code>std::bad_cast</code> exception thrown?</b> <br/> |
| <br/> |
| <b>Answer:</b> You probably try to use incorrect <code>std::locale</code> object. All Boost.Locale tools relay on <code>std::locale</code> object's facets. The locale object should be generated with <a class="el" href="classboost_1_1locale_1_1generator.html">generator</a> class and then passed to the function or alternatively global locale should be set using <code>std::locale::global()</code> function such that global locale (and default created one) would have required facets to use.</li> |
| <li><a class="anchor" id="faq_number"></a><b>I had installed global locale and try to write something to stream but still get wrong output?</b> For example: <div class="fragment"><pre class="fragment"><span class="preprocessor"> #include <boost/locale.hpp></span> |
| <span class="preprocessor"> #include <iostream></span> |
| <span class="keywordtype">int</span> main() |
| { |
| <a class="code" href="classboost_1_1locale_1_1generator.html" title="the major class used for locale generation">boost::locale::generator</a> gen; |
| std::locale::global(gen(<span class="stringliteral">""</span>)); |
| std::cout << <a class="code" href="group__manipulators.html#gae05b82e6658dc573521518fed5f5c77f">boost::locale::as::date</a> << <a class="code" href="group__manipulators.html#gae669b101cbeaed6f6d246ebdcaa8f39c">std::time</a>(0) << std::endl; |
| } |
| </pre></div> Prints a number instead of a date. <br/> |
| <b>Answer:</b> You forget to imbue the locale to the stream. Changing the global locale does not affect the locale in existing <code>iostream</code> objects. Thus because <code>std::out</code> and other global streams were created before changing the global locale Boost.Locale manipulators have no effect. You need to write: <div class="fragment"><pre class="fragment"><span class="preprocessor"> #include <boost/locale.hpp></span> |
| <span class="preprocessor"> #include <iostream></span> |
| <span class="keywordtype">int</span> main() |
| { |
| <a class="code" href="classboost_1_1locale_1_1generator.html" title="the major class used for locale generation">boost::locale::generator</a> gen; |
| std::locale l = gen(<span class="stringliteral">""</span>); |
| std::locale::global(l); |
| std::cout.imbue(l); |
| std::cout << <a class="code" href="group__manipulators.html#gae05b82e6658dc573521518fed5f5c77f">boost::locale::as::date</a> << <a class="code" href="group__manipulators.html#gae669b101cbeaed6f6d246ebdcaa8f39c">std::time</a>(0) << std::endl; |
| } |
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| © 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. |
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