Armed with new knowledge of Traits gained from the excellent "Squeak By Example" I tried: Smalltalk allClasses select: [:each | each hasTraitComposition]
which gave:
an OrderedCollection(ActionSequence BalloonBezierSimulation BalloonEngine BalloonEngineConstants BasicRequestor Behavior BrowserProvider ....WorldMenuProvider XMLTokenizer ZipConstants ZipFileConstants)
However browsing to a random class say "ActionSquence", doesn't show any evidence of Trait composition. Is this a problem with the current browser? Also is there a way to browse a Trait say TPureBehavior
My image is based on: sq3.9-7067web07.08.1
Thanks
Nick
Hi Nick,
on Tue, 25 Sep 2007 02:00:50 +0200, you wrote:
Armed with new knowledge of Traits gained from the excellent "Squeak By Example" I tried: Smalltalk allClasses select: [:each | each hasTraitComposition]
which gave:
an OrderedCollection(ActionSequence BalloonBezierSimulation BalloonEngine BalloonEngineConstants BasicRequestor Behavior BrowserProvider ....WorldMenuProvider XMLTokenizer ZipConstants ZipFileConstants)
However browsing to a random class say "ActionSquence", doesn't show any evidence of Trait composition. Is this a problem with the current browser?
You're right, (TraitComposition allInstances reject: [:each | each isEmpty]) size gives just 17 in my squeak-web image but TraitComposition allInstances size reports 325. Could you report your find on bugs.squeak.org, this should be investigated if empty TraitComposition should really populate the image. Perhaps #traitComposition was used unconditional.
Also is there a way to browse a Trait say TPureBehavior
Just select that name and alt-b opens a browser on TPureBehavior.
/Klaus
My image is based on: sq3.9-7067web07.08.1
Thanks
Nick
On Sep 25, 2007, at 2:00 , Nick Ager wrote:
Armed with new knowledge of Traits gained from the excellent "Squeak By Example" I tried: Smalltalk allClasses select: [:each | each hasTraitComposition]
which gave:
an OrderedCollection(ActionSequence BalloonBezierSimulation BalloonEngine BalloonEngineConstants BasicRequestor Behavior BrowserProvider ....WorldMenuProvider XMLTokenizer ZipConstants ZipFileConstants)
However browsing to a random class say "ActionSquence", doesn't show any evidence of Trait composition. Is this a problem with the current browser?
No. #hasTraitComposition only checks if the traitCompositions variable is not nil - the composition may still be empty. Which can happen quite easily since that variable is lazily initialized by sending #traitCompositions.
This appears to be by design, the codebase is scattered with #hasTraitComposition checks. But missing only one occurrence where #traitCompositions is sent unguarded by #hasTraitComposition will get the variable populated. And it will never get reset to nil as far as I can tell.
- Bert -
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