// In header: <boost/log/sinks/text_ostream_backend.hpp>
template<typename CharT> 
class basic_text_ostream_backend : public basic_formatted_sink_backend< CharT, combine_requirements< synchronized_feeding, flushing >::type >
{
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. 
  typedef std::basic_ostream< char_type > stream_type;  // Output stream type. 
  // construct/copy/destruct
  basic_text_ostream_backend();
  ~basic_text_ostream_backend();
  // public member functions
  void add_stream(shared_ptr< stream_type > const &);
  void remove_stream(shared_ptr< stream_type > const &);
  void auto_flush(bool = true);
  void consume(record_view const &, string_type const &);
  void flush();
};