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What is the point of friend class in C++?

What is the point of friend class in C++?

In this article, you learned about the friend class in C++ and how it allows one class to access private and protected members of another class. You can use this to share data members with derived classes while maintaining the essence of inheritance.

When should I use friend classes?

In general, friend classes are useful in designs where there is intentional strong coupling: you need to have a special relationship between two classes. More specifically, one class needs access to another classes’s internals and you don’t want to grant access to everyone by using the public access specifier.

Can we call friend to another class in C++?

A class Y must be defined before any member of Y can be declared a friend of another class. In the following example, the friend function print is a member of class Y and accesses the private data members a and b of class X . You can declare an entire class as a friend.

When would you use a friend function C++?

They are used in situations where we want a certain class to have access to another class’s private and protected members. Classes declared as friends to any another class will have all the member functions become friend functions to the friend class. Friend functions are used to work as a link between the classes.

What are the advantages of friend function in C++?

Advantages of Friend Function in C++ It allows the sharing of private class information by a non-member function. It accesses the non-public members of a class easily. It is widely used in cases when two or more classes contain the interrelated members relative to other parts of the program.

What is the difference between friend function and friend class?

A friend function is used for accessing the non public member of a class. A class can allow non-member function and other classes to access its own private data by making them friend A Friend class has full access of private data members of another class without being member of that class.

What are Friend classes What are advantages of using friend classes?

It allows to generate more efficient code. It provides additional functionality which is not normally used by the class. It allows to share private class information by a non member function.

Which is false about friend function?

Explanation: Friend functions are not in the scope of a class and hence cannot be called through a class object. A friend function can access all types of members of the class.

Why do we need the friend class and function?

A friend class is a class that can access the private and protected members of a class in which it is declared as friend. This is needed when we want to allow a particular class to access the private and protected members of a class.

What are Friend classes What are advantages of using friend classes *?

1. Provides additional functionality which is kept outside the class. 2. Provides functions that need data which is not normally used by the class.

What is virtual function and friend function in C++?

Virtual Function. It is non-member functions that usually have private access to class representation. It is a base class function that can be overridden by a derived class. It is used to access private and protected classes.

What is the advantage of friend function in C++?