Back when I was trying to design an ECS engine I had a class Prefab<T...> which you would inherit from using CRTP to define entities with stronger static typing

Back when I was trying to design an ECS engine I had a class Prefab<T...> which you would inherit from using CRTP to define entities with stronger static typing. For example, Player would be class Player: public Prefab<PlayerController, Transform, Sprite> {}; or something like that. C++ is infinitely flexible in that regard. I was never quite able to work out what would happen if you were to add/remove components at runtime to such Prefab classes. The semantics never quite made sense to me in terms of static typing, because it's no longer static.