Does Squeak include a generic node class?

Joe Davison jwdavison at
Fri Oct 23 13:23:56 UTC 1998

Les Tyrrell said: 
> One of the reasons I would not favor a TreeNode abastract class
> is that the thing I want to reuse is the pattern, and possibly
> multiple times within the same class.
> That's why I do not bother with a commonly used TreeNode, but instead
> manually do the work that a parameterized mixin could do for me.  I
> do the rubberstamping because I currently do not have a facility within
> the system to accomplish the same goal.  Such a facility would have to
> manage more than simply stamping out code- I would want it to do
> things in a manner such that good software engineering and reuse
> practices become a natural part of working with the environment.
> As far as running inheritance ( delegation, actually ) through
> patterns... that would be an interesting project for someone.
> The motivation is based on the observation that many patterns
> are used again and again, that there are variations in implementation
> of these patterns, and that quite often I am able to parameterize
> them and stamp them out on a grand scale.  At that point I am not
> writing individual methods nor specifying individual instance variables,
> I am saying "put this pattern into that class".  That is a different
> mode of programming, and it will require a different set of tools
> to facilitate it.  One aspect of that might be that it would be
> BTW, I am sure that this is a somewhat different connotation for the
> word "pattern" than that used by the Patterns people... the problem 
> is that "pattern" is such an appropriate name for what I have in mind,
> but unfortunately it was appropriated decades ago and I don't have
> a decent replacement term to use instead.  So keep that in mind...
> I don't intend to redefine the term, I just haven't found a better name
> for what I'm after.

I agree, this is a different use of "Pattern".  I think what you're
describing is what Gregory Kiczales calles "Aspect Oriented Programming".

Joe Davison 	jwdavison at

	Sure it doesn't work as well as it used to, 
		but think of all the money we're saving.

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