// In header: <boost/log/sources/severity_feature.hpp>
template<typename BaseT, typename LevelT = int> 
class basic_severity_logger : public BaseT {
public:
  // types
  typedef base_type::char_type                                                                     char_type;           // Character type. 
  typedef base_type::final_type                                                                    final_type;          // Final type. 
  typedef base_type::threading_model                                                               threading_model;     // Threading model being used. 
  typedef LevelT                                                                                   severity_level;      // Severity level type. 
  typedef unspecified                                                                              severity_attribute;  // Severity attribute type. 
  typedef strictest_lock< typename base_type::open_record_lock, no_lock< threading_model > >::type open_record_lock;    // Lock requirement for the open_record_unlocked method. 
  typedef unspecified                                                                              swap_lock;           // Lock requirement for the swap_unlocked method. 
  // construct/copy/destruct
  basic_severity_logger();
  basic_severity_logger(basic_severity_logger const &);
  basic_severity_logger(basic_severity_logger &&);
  template<typename ArgsT> explicit basic_severity_logger(ArgsT const &);
  // public member functions
  severity_level default_severity() const;
  // protected member functions
  severity_attribute const & get_severity_attribute() const;
  template<typename ArgsT> record open_record_unlocked(ArgsT const &);
  void swap_unlocked(basic_severity_logger &);
};