c++friend-class

Vice Versa Of friendship(accessibility) in class is true or not In C++?

A friend class can access the members of the class containing the friend function. Is Its vice-versa i.e. the class can also access the members of it friend class is true?

Solution

  • Is Its vice-versa i.e. the class can also access the members of it friend class is true?

    No, they can't. The friend keyword is unidirectional.

    To provide friend functionality in a bidirectional way, you have to specify both classes as friend for each other. This actually requires a forward declaration of at least one of these candidate classes:

    class B; // Forward declare
class A {
    friend class B;
};

class B {
    friend class A;
};