A friend class in C++, can access the "private" and "protected" members of the class in which it is declared as a friend. On declaration of friend class all member function of the friend class become friend of the class in which the friend class was declared. Friend status is not inherited; every friendship has to be explicitly declared. Friend classes can help in improving Encapsulation if used wisely.
Read more about Friend Class: Declaration, Advantages of Using Friend Class, Two Classes Accessing Private Data To Each Other, Scope, Features, Friend and Encapsulation
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