Frequently Asked Questions

• Some Boost.Locale functions throw std::bad_cast exception?
  
  Answer: You probably try to use an incorrect std::locale object. All Boost.Locale tools rely on std::locale object's facets. The locale object should be generated with the generator class and then passed to the function or alternatively global locale should be set using the std::locale::global() function such that global locale (and default created one) would have the required facets.
• I have installed global locale, but when I try to write something to a stream I still get the wrong output? For example:

  #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;
  }

  Prints a number instead of a date.
  Answer: You forget to imbue the locale to the stream. Changing the global locale does not affect the locale in existing iostream objects. Thus, because std::out and other global streams were created before changing the global locale, Boost.Locale manipulators have no effect. You need to write:

  #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;
  }