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69 | <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/> | |
70 | <br/> | |
71 | <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> | |
72 | <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"><div class="line"><span class="preprocessor">#include <boost/locale.hpp></span></div> | |
73 | <div class="line"><span class="preprocessor">#include <iostream></span></div> | |
74 | <div class="line"><span class="keywordtype">int</span> main()</div> | |
75 | <div class="line">{</div> | |
76 | <div class="line"> <a class="code" href="classboost_1_1locale_1_1generator.html">boost::locale::generator</a> gen;</div> | |
77 | <div class="line"> std::locale::global(gen(<span class="stringliteral">""</span>));</div> | |
78 | <div class="line"> 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;</div> | |
79 | <div class="line">}</div> | |
80 | </div><!-- fragment --> Prints a number instead of a date. <br/> | |
81 | <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"><div class="line"><span class="preprocessor">#include <boost/locale.hpp></span></div> | |
82 | <div class="line"><span class="preprocessor">#include <iostream></span></div> | |
83 | <div class="line"><span class="keywordtype">int</span> main()</div> | |
84 | <div class="line">{</div> | |
85 | <div class="line"> <a class="code" href="classboost_1_1locale_1_1generator.html">boost::locale::generator</a> gen;</div> | |
86 | <div class="line"> std::locale l = gen(<span class="stringliteral">""</span>);</div> | |
87 | <div class="line"> std::locale::global(l);</div> | |
88 | <div class="line"> std::cout.imbue(l);</div> | |
89 | <div class="line"> 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;</div> | |
90 | <div class="line">}</div> | |
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97 | © 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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