Exercise 5.3
A type/subtype inheritance relationship in general reflects an is-a relationship: A range-checking ArrayRC is a kind of Array, a Book is a kind of LibraryRentalMaterial, an AudioBook is a kind of Book, and so on. Which of the following pairs reflects an is-a relationship?
(a) member function isA_kindOf function
This reflects an is-a relationship. A member function is a specialized instance of a function. Both have a return type, a name, a parameter list, and a definition. In addition, a member function belongs to a particular class, may or may not be a virtual, const, or static member function, and so on. Inheritance correctly models the relationship.
(b) member function isA_kindOf class
This does not reflect an is-a relationship. ...
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