C + + pure virtual destructor

Virtual 0;

This is a pure virtual destructor, and this definition is allowed.

Generally pure virtual functions do not allow entities, but because all of the parent classes are completely refactored during the process of a class, each class must have a destructor.

So. the pure virtual destructor needs to provide the implementation of the function, but the general pure virtual function cannot have the realization

C + + pure virtual destructor