Question

Say I have CFooer and it implements method void foo().

I then have ISomething that has virtual void foo() = 0.

I now create a class:

class CSuperFoo : public CBase, public CFooer, public ISomething
{
};

When I instance CSuperFoo, will I get a cannot instance abstract class error, or would this use CFooer’s implementation to satisfy ISomething. If this does not work, why doesn’t it?

Thanks

Answer 1

You will have to provide an implementation in the Derived class CSuperFoo to be able to create objects of it, otherwise it will be an Abstract class.

The method foo() from the Base class ISomething needs to be overridden in the deriving class CSuperFoo explicitly because compiler cannot see any relation between method from class CFooer and ISomething::foo() as there is no relation between CFooer & ISomething, SO it demands the specific method being implemented in the derived class so that it is not an Abstract class anymore.

Does’nt work on Ideone.