Peter Fitzgibbons wrote:
>>> Hi Robert.  I don't understand the difference between your explanation
>> and
>>> re-opening the class on the instanciated Object?  Does this get into
>> $SAFE
>>> level?
>> The difference is whether you have a single instance (which you then
>> modify) or two instances (where you can leave the original unmodified).
>> At times it's not allowed / desirable to change another instance / class
>> and for these cases delegation is better.  Also, as long as we do not
>> have selector namespaces, several added methods to a class / instance
>> may run into naming conflicts which won't happen if ever part of the
>> code that wants to add a set of functionality creates their own
>> delegator.  Of course there are drawbacks to delegation (i.e. the
>> multiplication of objects which can make it hard to find the delegators
>> from the original object).
> Thanks Robert.  I think I get it now.  Is there a text somewhere that I can
> read up on the theory of object-delegation ?

You're welcome.  The concept is so ubiquitous that any decent book on OO 
theory will cover it.

Some links to start with
http://en.wikipedia.org/wiki/Delegation_pattern
http://c2.com/cgi-bin/wiki?DelegationPattern
http://c2.com/cgi-bin/wiki?search=delegation

Kind regards

	robert