Why do we actually need Private or Protected inheritance in C++?

Question

In C++, I can\'t think of a case in which I would like to inherit private/protected from a base class:

class Base;
class Derived1 : private Base;
class Deri         


        

Answer 1

I once implemented these data structures as classes:

• Linked list
• Generic array (abstract)
• Simple array (inherits from generic array)
• Big array (inherits from generic array)

The big array's interface would make it look like an array, however, it was actually a linked list of fixed-size simple arrays. So I declared it like this:

template 
class CBigArray : public IArray, private CLnkList {
    // ...