// In header: <boost/log/sources/severity_logger.hpp>
template<typename LevelT = int> 
class wseverity_logger_mt : public basic_composite_logger< wchar_t, wseverity_logger_mt< LevelT >, multi_thread_model< implementation_defined >, features< severity< LevelT > > >
{
public:
  // construct/copy/destruct
  wseverity_logger_mt();
  wseverity_logger_mt(wseverity_logger_mt const &);
  template<typename... ArgsT> explicit wseverity_logger_mt(ArgsT...const &);
  explicit wseverity_logger_mt(LevelT);
  wseverity_logger_mt & operator=(wseverity_logger_mt const &);
};