// In header: <boost/log/sources/severity_channel_logger.hpp>
template<typename LevelT = int, typename ChannelT = std::wstring> 
class wseverity_channel_logger : public basic_composite_logger< wchar_t, wseverity_channel_logger< LevelT, ChannelT >, single_thread_model, features< severity< LevelT >, channel< ChannelT > > >
{
public:
  // construct/copy/destruct
  wseverity_channel_logger();
  wseverity_channel_logger(wseverity_channel_logger const &);
  template<typename... ArgsT> 
    explicit wseverity_channel_logger(ArgsT...const &);
  wseverity_channel_logger & operator=(wseverity_channel_logger const &);
};