Private inheritance can be achieved has a relationship, which is included.
Private inheritance:
1. The public and protected members of the parent class into subclasses private members in the subclass,
1.1 This means that inherit from the parent class over those members (public / protected), a member of the subclass can call it;
But the object subclasses will not be able to call it;
Further understanding is that the subclass can call parent class (public / private) interface, but these interfaces are not exposed to .
This feature just realized features include (composite) of.
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