What Is A Friend Class C++?

Is Friend a keyword in C++?

friend is a keyword in C++ that is used to share the information of a class that was previously hidden.

For example, the private members of a class are hidden from every other class and cannot be modified except through getters or setters..

What is a class type C++?

A class in C++ is a user-defined type or data structure declared with keyword class that has data and functions (also called member variables and member functions) as its members whose access is governed by the three access specifiers private, protected or public. By default access to members of a C++ class is private.

What is friend function with example?

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. … Friend functions allow alternative syntax to use objects, for instance f(x) instead of x.f() , or g(x,y) instead of x.g(y) .

How do you declare a friend function?

A friend function can access the private and protected data of a class. We declare a friend function using the friend keyword inside the body of the class.

How do you declare a friend 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. In a template definition, a type parameter can be declared as a friend.

Why friend function should be avoided?

1) Friends should be used only for limited purpose. too many functions or external classes are declared as friends of a class with protected or private data, it lessens the value of encapsulation of separate classes in object-oriented programming. 2) Friendship is not mutual.

What is a friend function C++?

A friend function of a class is defined outside that class’ scope but it has the right to access all private and protected members of the class. … A friend can be a function, function template, or member function, or a class or class template, in which case the entire class and all of its members are friends.

What is friend class in C++ with example?

A friend class can access all the private and protected members of other class. In order to access the private and protected members of a class into friend class we must pass on object of a class to the member functions of friend class.

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

One advantage of the friend function or class is that we can access the private and protected data of the class. For Example, if we are implementing a linked list, then we can make the linked list class as a friend of the node class and access its data as the linked list consists of nodes.

Where does keyword friend should be placed?

Explanation: The keyword friend is placed only in the function declaration of the friend function and not in the function definition because it is used toaccess the member of a class.

What is friend function and its advantages?

What are advantages of using friend classes? – The friend function is a ‘non member function’ of a class. It can access non public members of the class. A friend function is external to the class definition. … Allows sharing private class information by a non member function.

Are Friend Classes bad?

At least friendship restricts the reduced encapsulation to the explicitly specified classes that need the extra access. The fact that the two classes are now tightly coupled need not be a bad thing, they can be considered a single unit of the overall design. No, not at all. … Friend classes exist for a reason.