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Relationships between Classes

• Inheritance, although useful, can be over-used.
• Should a class Tire be derived from a Circle class?
• Conceptually, the arrangement does not make sense.
• A tire has a circle as it's boundary.

  class Tire
  {
     ...
  private:
     string rating;
     Circle boundary;
  };
  

• The term for this relationship is association.

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