Can a poninter of base class hold object of class derived from the derived class

[sarbhatt]

I have a question, in multilevel inheritance:

Class Base
{
};

Class derv1:public Base
{
}

Class derv2:public derv1
{
}

Is ptrBase = &objderv2; valid?

If yes, then if we have virtual method in Base class will VTABLE of granchild(derv2 ) class have function address of this virtual method?

Thanks

[Laharl]

Base* ptrBase = &objDerv2; is fine. If you add a virtual method to Base, derv1 and derv2 must redefine those by the rules of virtual functions, but once that happens, the Vtable will include it.

[weaknessforcats]

If you add a virtual method to Base, derv1 and derv2 must redefine those by the rules of virtual functions

This only applies to pure virtual functions. Otherwise, the virtual function is inherited like any other function and its address ends up in the derived class VTBL.

[sarbhatt]

Thanks for the reply.