Virtual Inheritance

[news-east]

It's probably a silly question, but if there exists a base class A, and from
it derives classes B and C, and a further class D multiply-inherits from B
and C. Let's say B derives virtually from A, and C derives non-virtually.

What should the compiler behaviour be on instantiation of an object of type
D* ?



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[Victor Bazarov]

Re: Virtual Inheritance

"news-east" <Aidend@None> wrote...[color=blue]
> It's probably a silly question, but if there exists a base class A, and
> from it derives classes B and C, and a further class D multiply-inherits
> from B and C. Let's say B derives virtually from A, and C derives
> non-virtually.
>
> What should the compiler behaviour be on instantiation of an object of
> type D* ?[/color]

An object of type D* is a pointer. Instantiating it does not depend on the
base classes of D (and their base classes, and so on).

In case you made a typo and didn't intend to write D*, then there should be
two objects of class A in a D. One that comes from B and the other from C.
The Standard specifies so in 10.1/4.

V