// In header: <boost/date_time/time_formatting_streams.hpp>
template<typename time_duration_type, typename charT = char> 
class ostream_time_duration_formatter {
public:
  // types
  typedef std::basic_ostream< charT >                 ostream_type;           
  typedef time_duration_type::fractional_seconds_type fractional_seconds_type;
  // public static functions
  static void duration_put(const time_duration_type &, ostream_type &);
};