Friend function & friend class

FRIEND FUNCTION & FRIEND
CLASS

Abhishek Wadhwa
Bharati Vidyapeeth‟s Institute of Computer Application
Management(BVICAM)

Who is a Friend?

A friend is one who has access to all your
“PRIVATE” stuff

What is Friend Function?
 A non member function

 Has access to all the Private and Protected
Members of a class

How is it different from normal
function?
 A member is access “through” the object

Ex : sample object;
object.getdata();

 Whereas A Friend function requires object to
be passed by value or by reference as a
parameter

Ex : void getdata(sample object);

Code Snippet:
class demo
{
int x;
public:
demo(int xx)
{
x=xx;
}
friend void display(demo); //Declaration inside the class
};

void display(demo dd1) //Definition outside the class
{
cout<<dd1.x;
}

What are its Disadvantages?
 Violates Data Hiding

 Violates encapsulation

Friend class
 Provides the same feature as that of Friend
Fn.

 Allows „member fn” of one class to friend of
other class

 i.e. the private member of the class will be
accessible to the friend class

Code snippet:
class xxx
{
int x;
public:
xxx(int xx)
{
x=xx;
}
friend class yyy;
};
class yyy
{
public:
void f1(xxx obj)
{cout<<“x=”<<obj.x;}
};

Thank You
www.programming90.blogspot.in

www.ipnotes.blogspot.in
Abhishek wadhwa

Friend function & friend class

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