Abstract classes

If there are two classes say A and B in which A is abstract and B is derived
from A.
I want Lua to know about A and B, how can they be registered?
I see in test_abstract_base you register an abstract class which is derived
from "abstract_wrap" and then "concrete" is defined in Lua code.
So correct me if I am wrong but this is not what I am after, could anyone
give me a snippet which would achieve letting Lua know about both A and B.
Thanks.

For clarity

struct A
{
virtual ~A(){}
virtual void bar()=0;
};

struct B : A
{
void bar(){}
};

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