What is friend function explain with an example?

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What is friend function explain with an 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) .

What Is syntax of friend function?

The friend function is declared using the friend keyword inside the body of the class. Friend Function Syntax: class className { .. friend returnType functionName(arguments); .. } By using the keyword, the ‘friend’ compiler understands that the given function is a friend function.

Where we should declare a function as a friend to a class?

A friend function can be declared in the private or public section of the class.

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Why do we need the friend class and function?

A proper use of friend classes increases encapsulation, because it allows to extend the private access of a data-structure to its parts — which the data-structure owns — without allowing private access to any other external class.

What is the friend function in 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. Even though the prototypes for friend functions appear in the class definition, friends are not member functions.

What is friend function characteristics?

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.

What are the characteristics 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.
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Which keyboard is used to represent a friend function?

Which keyword is used to represent a friend function? Explanation: friend keyword is used to declare a friend function.

What is friend function What are its characteristics?

What is friend class and function in C++?

Friend class and function in C++. Friend Class A friend class can access private and protected members of other class in which it is declared as friend. It is sometimes useful to allow a particular class to access private members of other class.

What is the difference between friend function and member function?

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. Even though the prototypes for friend functions appear in the class definition, friends are not member functions. A friend can be a function, function template, or member function,…

How to declare a friend function while declaring a class?

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A friend function while declaring is preceded with the “friend” keyword as shown here: As shown in the above code, the friend function needs to be declared in the same class where the protected or private keyword has been declared for those data to be accessible outside the class.

What is a friend in Python?

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.