Friend Function - Class
What are Friend Function in C++?
How to bridge between two classes in C++?
A Friend Function
is a function that can have access to even the private, protected members of a class. This can be an ordinary function or a member of another class. It acts as a bridge between two classes.
friend int sum ( friendcl x);
void set( int w, int q);
void friendcl:: set( int w, int q)
int sum (friendcl x)
return x.a + x.b;
cout << "The sum of the values is::" << sum (r);
The sum of the values is::13
In the above example the class "sum" is a friend function for the class "friendcl". So this can use even the private variables "a,b" of the class "friendcl". The function "sum" is not a member of any class. The "x" is an object of the class "friendcl" function, which is declared in the friend function to pass arguments.
Thus, a bridge between two classes, i.e. "sum" and "friendcl" can be established.