It is possible to declare an entire class as a friend of another class.

Name: It is possible to declare an entire class as a friend of another class.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

By declaring a class as a friend of another class, all the member functions and member data of the friend class become accessible by the declaring class as if they were part of its own implementation. This means that it is possible to declare the entire class as a friend of another class.

It Is Possible to Declare an Entire Class as a Friend