Along the lines of Nicolas' hint, here's one example of what you can *not*
do, and expect to work (just the other way around):
GLMPagerScrollBrick pagerModel: aModel
pagerModel := aModel.
-snip-
pagerModel announcer weak
when: GLMPagePushed send: #onPagePushed: to: self.
-snip-
In a workspace:
pager:= GLMPagerModel new.
brick := GLMPagerScrollBrick new.
brick pagerModel: pager.
brick := nil.
Smalltalk garbageCollect.
pager announcer subscriptions numberOfSubscriptions. --> 8
And, with a small addition of early exit after nilling pagerModel if aModel
is nil:
(pager announcer subscriptions instVarNamed: #subscriptions) anyOne
subscriber pagerModel: nil.
Smalltalk garbageCollect.
pager announcer subscriptions numberOfSubscriptions. --> 0
In other words: You can NOT hold references to Announcers in an object that
subscribes to it weakly.
Cheers,
Henry
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