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News: Read this please.The Great Kangaroo Escape Looking for reviews of the 4th ed on Amazon!   Twitter:  @skochan

+ Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
|-+ Old Stuff
| |-+ Answers to Exercises
| | |-+ Chapter 11
| | | |-+ Ex 11-5 question.
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Author Topic: Ex 11-5 question. (Read 962 times)
Nick Harvey
Posts: 19

on: March 19, 2012, 11:11:37 PM

I have completed Exercise 11-5 to declare my Square class as a rectangle with some of the rectangle's methods (area and perimeter) and add those that pertain to a square (side, setSide and initWithSide).

This removes access to all of the other methods I have written for the Rectangle class including ones used in my XYPoint and GraphicObject classes.

What I really need in my Square class is to inherit all methods from my Rectangle class and only disable those Rectangle methods that are not applicable to a square (initWithWidth andHeight, setWidth andHeight). All other Rectangle methods I have are applicable to a Square.

I can declare all Rectangle methods (and XYPoint and GraphicObject methods) I need in my Square class but this seems like a lot of work to effectively disable two Rectangle methods that do not apply for a Square.

Is there a way to do this: declare a subclass and disable some inherited methods that do not apply?
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