I have seen implementations of type erasure/delegates that store an instance pointer and pointer-to-member-function as an instance and pointer-to-member-functio

I have seen implementations of type erasure/delegates that store an instance pointer and pointer-to-member-function as an instance and pointer-to-member-function of a dummy type with the same calling convention. It's interesting how many different member function pointer sizes Windows has. Undefined behavior and compiler dependent, but consistent.