I mentioned one such example about 6 hours before your post. As the other reply stated, when you mostly want to keep the base class but over-ride a small speci

I mentioned one such example about 6 hours before your post. As the other reply stated, when you mostly want to keep the base class but over-ride a small specific subset of what it does. E.G. The base class uses class member functions to do save/load records from a store. You want to implement a variant of that class which instead works well with a database engine you like. You can then derive a class and define JUST the storage and recall functions, and inherit everything else.