In the second case , the size of vptr will be added to each and every object
.
1st class = one int :4
2nd class = one int +one int from base + vptr =12
3rd class = one int + one int from base + vptr =12
4th class =one int from each base class + one int from each of the grand
parent +one vptr =20
On Sun, Jul 3, 2011 at 2:43 PM, himanshu kansal <himanshukansal...@gmail.com
> 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"...
>
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