Tools

					_PATTERNS AND SOFTWARE DESIGN_
by Richard Helm and Erich Gamma

Listing One

class DigitalTimeDisplay;
class Timer {
public:
   Timer(DigitalTimeDisplay*);
   long CurrentTime() const;
   void Tick();
private:
   DigitalTimeDisplay* _display;
   long _currentTime;
};

class DigitalTimeDisplay {
public:
   DigitalTimeDisplay();
   void DisplayTime();
   void UpdateTime(long time);
};

void ...