Inheritance allows you to define a new class with all the properties of the
parent class and to add new data and functions.
Example: derive a new class myVector2 from class Vector2.
class myVector2: public Vector2
[inherited public members of Vector2...]
[add new public members here...]
[inherited protected members of Vector2...]
[add new protected members here...]
[private members here...]
private members of the parent class are not