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3rdparty/boost_1_81_0/libs/locale/doc/faq.txt 1.81 KB
73ef4ff3   Hu Chunming   提交三方库
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  //
  // Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
  //
  // Distributed under the Boost Software License, Version 1.0.
  // https://www.boost.org/LICENSE_1_0.txt
  
  /*!
  \page faq Frequently Asked Questions
  
  -   \anchor faq_bad_cast <b>Some Boost.Locale functions throw \c std::bad_cast exception?</b>
      \n
      \n
      \b Answer: You probably try to use an incorrect \c std::locale object. All Boost.Locale tools rely on \c std::locale object's facets.
      The locale object should be generated with the \ref boost::locale::generator "generator" class and then passed to
      the function or alternatively global locale should be set using the \c std::locale::global() function such that
      global locale (and default created one) would have the required facets.
  -   \anchor faq_number <b>I have installed global locale, but when I try to write something to a stream I still get the wrong output?</b>
      For example:
      \code
      #include <boost/locale.hpp>
      #include <iostream>
      int main()
      {
          boost::locale::generator gen;
          std::locale::global(gen(""));
          std::cout << boost::locale::as::date << std::time(0) << std::endl;
      }
      \endcode
      Prints a number instead of a date.
      \n
      \b Answer: You forget to imbue the locale to the stream. Changing the global locale does not affect the
      locale in existing \c iostream objects. Thus, because \c std::out and other global streams were created
      before changing the global locale, Boost.Locale manipulators have no effect. You need to write:
      \code
      #include <boost/locale.hpp>
      #include <iostream>
      int main()
      {
          boost::locale::generator gen;
          std::locale l = gen("");
          std::locale::global(l);
          std::cout.imbue(l);
          std::cout << boost::locale::as::date << std::time(0) << std::endl;
      }
      \endcode
  
  */