Accessing Data Members Through Object Pointer

C++ provides another operator ->* for use exclusively with pointers to members called member dereferencing operator. This operator is used to access a member using a pointer to it with pointer to the object. For example

Class X

{

int y;

public:

int a;

int b;

}

void main()

{

X *PO;

int X::*ptr; //

ptr = &PO::a; // int X::*ptr = &X::a;

PO->*ptr = 20;

int k = PO->*ptr;

}