FRIEND FUNCTIONS AND FRIEND CLASS

Friend Functions and Friend Class:

a) The private members of a class are not accessible outside the class.
 b) The only exception to this is friend functions and friend class.

Friend Function:
a) The function which is declared in a class as friend can access the private members of the class.
 b) The friend function cannot access the this pointer.

 class A
 {
 private:
 int i, y;
 public:
 friend void fri_function();
 };
void fri_function()
 {
 A a;
 a.i = 1;
 a.y = 2;
 }

Friend Class:
a) A class can be declared as a friend to another class.
 b) The member functions of the container class can access the private members of the friend class by creating an object of the friend class.

 class A;
 class B
 {
 public:
 friend A;
 };

 Thus A becomes a friend of B.

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