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In c++ what is the main purpose of the Inheritance.
Which is the best Inheritance.

In C++, there are 3 kind of inheritance, public (most used), protected(rarely used) or private

You could make "capacity" an object attribute. Non-containers would have a value of 0.

Why the hesitance to use RTTI?

I like the idea of making "capacity" an object attribute.

In c++ there are three type of types of inheritance.
Private
Protected
Public