If you wanted to take a mutable object and make it immutable and be
able to go back again to mutable,
how could you do that?
In particular the part that has me as a smalltalk beginner stumped is
how to disallow any messages
that would result in a state change while still allowing messages that
only read state.
Do you have to handle on a message by message basis? ( Eeek lots and
lots of work )
Or is there something you could work into a superclass and use in its
descendents? ( ideal for what I need. )
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