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