objects are stored as structs with pointers to: 1. a struct that holds its properties 2. a struct that holds its methods
A subclass's prop struct contains the struct of its super class at the very begining of the memory block allocated to it.
struct Person_Properties{ Properties super; char * name; };
This allows for easy inheritance and casting. Simply casting Person_Properties * p to (Properties *)p provides easy access to the properties of the super class.
I have implemented method inheritance in a similar way.
Polymorphism is implemented as well. I replace pointers to functions in the super method struct with new methods to override them and provide polymorphism.
I wanted to learn how object-oriented programming was implemented in C. I enjoy deriving complex things on my own to really understand the inner-workings.