20.6 Private Inheritance and Names

• Inheritance normally implies an "is-a" relationship
  • Substitution principle: If B inherits from A, then B can be used wherever A is expected
  • Interface for the base class becomes a basis for the i/f for the derived class
• We occasionally use inheritance even when the "is-a" relationship doesn't hold (see example)
  • A solution is to declare that Set inherits privately from List
  • With private inheritance all inherited attributes become private in the derived class
  • The base class' interface does not flow through to the derived class

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