ui factory - what should it do?

[Aaron Bentley]

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Martin Pool wrote:
>>W.r.t. the reuse of member variables: We're not talking about having
>>these objects around for indefinite periods : I don't think coding every
>>one of them for serial-calls is sensible, I'd ignore the issue until you
>>have a use case for reusing an instance of one of these objects.
> 
> 
> I think the discomfort there comes from having references in a
> long-lived object that are only meaningful for the duration of a single
> call.  (It sounds like I'm talking about gc but I'm thinking of the
> burden on the developer not on the system.)  If the class is hidden
> from most callers behind a function it's less of a problem but 

Yes, that's pretty much it.  As a related issue, most of the operations
on TreeTransforms become invalid after TreeTransform.apply() is called.
 But the TreeTransform object is meant to have many operations performed
on it, so *something* will have a reference to it.

Aaron
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