Newbie: copy, assignment of class instances

[Larry Luther]

Thank you for the clarifications.
I'm trying to do a shallow copy.

After reading Simen & bearophile, I would add a "copy" member function:

  class A {
    int x, y;

    void copy (in A a) {
      x = a.x;
      y = a.y;
    }
  }

  class B : A {
    int z;

    void copy (in B b) {
      super.copy( b);
      z = b.z;
    }
  }

  B foo = new B,
  B bar = new B;

Q:  Do I copy the member variables contributed by class A
    from "foo" to "bar", this way:  "(cast(A) bar).copy( foo);"?
    Or maybe "bar.A.copy( foo);"?

Larry
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