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