Uncle Bob's Agile Development Corner
OBSERVEREvolving into a pattern, Part 2
by Robert C. Martin
Listing 3. ObservableClock.cc (C++).
class ObservableClock : public Clock, public TimeSource
virtual void tic()
virtual void setTime(int hours, int minutes, int seconds)
Clock::setTime(hours, minutes, seconds);
TimeSource::notify(hours, minutes, seconds);
Robert C. Martin is president of Object Mentor Inc., a firm that offers high-level, OO software design consulting, training, and development services. He is the author of Designing Object Oriented C++ Applications Using the Booch Method. He can be contacted at firstname.lastname@example.org.