Two Classes Accessing Private Data To Each Other
Sometimes private data members are needed to be accessed and used by two different classes. In that case, friend class (or friend function) can be used. Friend class can access all data members of both the classes, even private and protected data.
For that purpose, each class should be declared as friend in the other class. They should not be member of any one of the classes.
Read more about this topic: Friend Class
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