Friend class and function

Friend class and function

I need to know what the class or function called “friend” is. My teacher explained it in class, but I don’t quite understand how to call it and declare it.

A friend function is allowed to access all the protected and privatemembers of a class, just like any other member function. If the wholeclass is declared as a friend, any member function of that class canaccess the private and public members of the original class.

Here is an example:

class X{   X ();};class A{public:   A ();   friend class B; // friend class declaration   friend void foo (); // friend function   friend X::X (); // friend member function of another classprivate:   int i; // private member.};void bar () // non-friend{   A a;   a.i = 10; // **error** A::i is private}void foo (){   A a;   a.i = 10; // **OKAY*** foo is a friend}

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