On 18 Oct 2017, at 08:32 , James Ladd <ladd.james@gmail.com> wrote:

What if accessors were generated but not mutators?

The point is that, once a method exists, there is not way to restrict who can send a message that will execute it.  So if one were forces to generate a reader method, or a writer method, just to give access to a subclass, then every object n the system would also gain access.

Andrew