// In header: <boost/log/sources/channel_logger.hpp>
template<typename ChannelT = std::wstring> 
class wchannel_logger_mt : public basic_composite_logger< wchar_t, wchannel_logger< ChannelT >, multi_thread_model< implementation_defined >, features< channel< ChannelT > > >
{
public:
  // construct/copy/destruct
  wchannel_logger_mt();
  wchannel_logger_mt(wchannel_logger_mt const &);
  template<typename... ArgsT> explicit wchannel_logger_mt(ArgsT...const &);
  explicit wchannel_logger_mt(ChannelT const &);
  wchannel_logger_mt & operator=(wchannel_logger_mt const &);
};