1 MORE QUES....HOW IS "DELEGATED TO SISTER CLASS" IMPLEMENTED...MEANS HOW
CAN ONE CLASS CALL ANOTHER CLASS'S FUNCTION WITHOUT KNOWING ANYTHING ABOUT
IT....
On Sun, Jul 3, 2011 at 2:43 PM, himanshu kansal <[email protected]
> wrote:
> class Base
> {
> public:
> int a;
> };
>
> class X: public Base
> {
> public:
> int x;
> };
>
> class Y: public Base
> {
> public:
> int y;
> };
>
> class Z:public X,public Y
> {
> };
>
> int main()
> {cout<<sizeof(Base)<<endl;
> cout << sizeof(X) <<endl;
> cout << sizeof(Y) <<endl;
> cout << sizeof(Z) <<endl;
> }
> o/p is 4
> 8
> 8
> 16...
> which is absolutely fine.....
>
> but the problem arises here....
> class Base
> {
> public:
> int a;
> };
>
> class X:virtual public Base
> {
> public:
> int x;
> };
>
> class Y:virtual public Base
> {
> public:
> int y;
> };
>
> class Z:public X,public Y
> {
> };
>
> int main()
> {cout<<sizeof(Base)<<endl;
> cout << sizeof(X) <<endl;
> cout << sizeof(Y) <<endl;
> cout << sizeof(Z) <<endl;
> }
>
> o/p is 4
> 12
> 12
> 20
> why the size is 12 and 20 for x and Z....does this is because that
> some sort of VPTR IS maintained in the class....if yes then then what
> does that points to....
>
> PS:HERE.....i am talking about virtual inheritance....NOT ABOUT
> "VIRTUAL FUNCTIONS"...
>
--
Regards
Himanshu Kansal
Msc Comp. sc.
(University of Delhi)
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