Building A Virtual Table for a Subclass
When a subclass is created, a new virtual method table is generated.
Methods that are inherited point to the same function as the parent class.
(and are found in the same offset in the virtual method table).
Methods that are overridden occupy the same offset location, but
point to the new function, instead of the version in the parent class.
Intro OOP, Chapter 27, Slide 14