Multiple inheritance allows to specify that one  class is a subclass of several other classes.

Some languages allow multiple inheritance for arbitrary classes,   others restrict it to interfaces,   some don't allow it at all.



Task

Write two classes (or interfaces) Camera and MobilePhone,   then write a class CameraPhone which is both a Camera and a MobilePhone.

There is no need to implement any functions for those classes.




Camera := Object clone
Camera click := method("Taking snapshot" println)
 
MobilePhone := Object clone
MobilePhone call := method("Calling home" println)
 
CameraPhone := Camera clone
CameraPhone appendProto(MobilePhone)
 
myPhone := CameraPhone clone
myPhone click	// --> "Taking snapshot"
myPhone call	// --> "Calling home"