C++ Friend Function2 min read

There are private and protected members in a class that is inaccessible from outside of the class, constituting one of the concepts of object-oriented programming i.e. data hiding. However, these rules can be broken by a friend function.

A function defined with a friend keyword is called a friend function. It can access both the private and protected members from outside the class.

Declaration of friend function:

  • A friend can be a member’s function, function template, or function, or a class or class template,  in which case the entire class and all of its members are friends.
  • Although the friend function appears inside the class, they are not membersfunction.
  • They can be declared anywhere in the class.

Example: C++ program for a friend function


C++ friend class

friend keyword is also used to declare a friend class in C++. When a class is declared a friend class, all the member functions of the friend class become friend functions.

In the above example, class Two is a friend class of class One indicating that we can access all the members of class One from class Two. However, vice-versa is not granted.

Example: C++ program for a friend class.



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