Introduction to OOP Chapter 14: Polymorphism and Software Reuse: next previous audio real text

Using Composition

Everything must be redefined, but implementation can make use of the list data structure.

class Set {
	void add(int);
	int  includes(int);
	void remove(int);
	int firstElement();
	List data;

	void Set::add (int x)
		if (! data.includes(x))

	int Set::includes (int x)
		{ return data.includes(x); }

	void Set::remove (int x)
		{ data.remove(x); }

	int Set::firstElement ()
		{ return data.firstElement(); }

Intro OOP, Chapter 14, Slide 07