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Inheritance Issues

• Are declarations local to superclass also visible to subclass?
  • public inheritance in C++.
  • Violates static scoping laws!
• Overrriding of class methods:
  • class T = record proc P = ...end;
    class U = inherits T
       with record proc P = ...end;
    var X: U in call X.P
  • P of U is invoked.
• Multiple inheritance
  • class T = record proc P = ...end;
    class U = record proc P = ...end;
    class R = inherits T, inherits U
       with ...end;
    var X: R in call X.P
  • Which P is selected?