protected inheritance

Question

Why protected and private inheritance are defined and proposed? I understand some cases private inheritance could be used but it is not recommended. How about protected inhe

Answer 1

I generally don't use protected inheritance. In fact, I don't generally use private inheritance. If something does not satisfy the Liskov Substitution Principle then I don't see a reason to use inheritance of any kind; and if it does satisfy LSP then you use public inheritance.

However, the language distinguishes between private and protected only from the class's point of view (that is, code using the class can't tell the difference).

You should use protected inheritance when you want it's semantics, and you should use private when you don't want protected.