// In header: <boost/log/sinks/debug_output_backend.hpp>
template<typename CharT> 
class basic_debug_output_backend :
  public basic_formatted_sink_backend< CharT, concurrent_feeding >
{
public:
  // types
  typedef base_type::char_type   char_type;    // Character type. 
  typedef base_type::string_type string_type;  // String type to be used as a message text holder. 
  // construct/copy/destruct
  basic_debug_output_backend();
  ~basic_debug_output_backend();
  // public member functions
  void consume(record_view const &, string_type const &);
};