What Is The Use Of Friend Class?

What is a friend function Why do we use it?

In object-oriented programming, a friend function, that is a “friend” of a given class, is a function that is given the same access as methods to private and protected data.

A friend function is declared by the class that is granting access, so friend functions are part of the class interface, like methods..

What is definition of a friend?

1 : a person who has a strong liking for and trust in another person. 2 : a person who is not an enemy friend or foe. 3 : a person who helps or supports something She was a friend to environmental causes.

What are the 3 types of friendship?

The 3 Kinds of Friendships Friendships of utility: exist between you and someone who is useful to you in some way. … Friendships of pleasure: exist between you and those whose company you enjoy. … Friendships of the good: are based on mutual respect and admiration.

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.

Are Friend Classes bad?

Many people think of a friend function as something outside the class. … A friend function in the class declaration doesn’t violate encapsulation any more than a public member function violates encapsulation: both have exactly the same authority with respect to accessing the class’s non-public parts.

How do you declare a friend function?

To make a function as a friend of a class, it is declared inside the class either in private or in public section with keyword friend before its declaration as follows. }; Here temp is a friend function of the class Temperature. So, it can access all the private and protected members of the class.

What are the features of friend function?

Characteristics of a Friend function:The function is not in the scope of the class to which it has been declared as a friend.It cannot be called using the object as it is not in the scope of that class.It can be invoked like a normal function without using the object.More items…

Can a friend function be a member of another class?

A function or class cannot declare itself as a friend of any class. In a class definition, use the friend keyword and the name of a non-member function or other class to grant it access to the private and protected members of your class.

Can a friend function be virtual?

Virtual functions cannot be static and also cannot be a friend function of another class. Virtual functions should be accessed using pointer or reference of base class type to achieve run time polymorphism. The prototype of virtual functions should be same in base as well as derived class.

What are the advantages of using friend classes?

What are friend classes? What are advantages of using friend classes?Provides additional functionality which is kept outside the class.Provides functions that need data which is not normally used by the class.Allows sharing private class information by a non member function. Next Page »

What is the another name of friend?

SYNONYMS FOR friend 1 comrade, chum, crony, confidant. 2 backer, advocate. 4 ally, associate, confrere, compatriot.

How do you know if someone is a friend?

If you want to chat or hang out, they claim to be too busy. But if they want a favor they somehow have all the time in the world. While any of one of us can claim to be busy, a true friend will make time for you. Maybe they can’t talk right now, but if you need to they will find time to call you back promptly.

What is a friend function What are the merits and demerits of friend function?

What are the merits and demerits of friend function? A friend function is the friend of the given class which can access all the public, private and protected variables of that class in which it is declared. … It is able to access members without need of inheriting the class.

What is the difference between friend class and friend function?

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.

Which rule will not affect the friend function?

In principle, private and protected members of a class cannot be accessed from outside the same class in which they are declared. However, this rule does not affect friends.