Object "A" inherited object "B". And you need to return the object link "B".

[Mihail Lorenko via Digitalmars-d-learn]

Hello!
Interested in a question.
Object "A" inherited object "B". And you need to return the 
object link "B". Is this possible in this language? Here is an 
example:

class B
{
   protected int a;
   public void step() {};
}

class A : B
{
   public override step()
   {
       import std.random;
       a = uniform(5,100);
   }
}

void main()
{
    B* b;
    A  a;
    a.step();
    b = a.B; // @FixMe: Here you need a link to object B from 
object A.
}

Sorry to trouble you, thanks in advance!