inheritance, pointercast

[Rasmus]

Hi, here a quick question:

I have class A,B,C where B and C is extended from A.

I would like to construct A objects like:

A *a3 = new A(a1, a2);

and a3 should be an object of type B or C.

Is this possible?
| true: How?
| false: Can you give me a nice solution?

Thanks for your time
Rasmus