its two ints from X and Y classes :8
2 copies of int from Base class via Class X and Class Y :8
surender
On Tue, Jul 5, 2011 at 10:39 PM, oppilas . <jatka.oppimi...@gmail.com>wrote:
> @T3rminal
> Then how would you explain size of Z in case of normal inheritance(
> sizeof(Z)=16
>
> On Mon, Jul 4, 2011 at 4:08 AM, T3rminal <piyush....@gmail.com> wrote:
>
>> @abc abc
>> 4th class= two ints from X and Y classes + one int from base class( as
>> this class is shared ) + 2 virtual pointers of X and Y classes.
>>
> According to your logic it should be 12
>
>>
>> On Jul 3, 2:24 pm, abc abc <may.i.answ...@gmail.com> wrote:
>> > 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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