cpp03
inheritance https://www.youtube.com/watch?v=-W-TYjL0aFE&t=626s https://www.youtube.com/watch?v=X8nYM8wdNRE multiple inheritance https://www.youtube.com/watch?v=2DKRmhBmH7E https://www.geeksforgeeks.org/multiple-inheritance-in-c/ hybrid inheritance https://www.youtube.com/watch?v=1VdYat6Yqxs virtual destructors https://www.youtube.com/watch?v=jELbKhGkEi0 https://www.geeksforgeeks.org/virtual-destructor/