[Newbies] Character allInstances size=0 for 5.3 latest

K K Subbu kksubbu.ml at gmail.com
Sun Mar 1 05:07:13 UTC 2020


On 01/03/20 1:41 AM, Vaidotas Did┼żbalis wrote:
> Thank you for your explanations, but ... but we have characters in the 
> image. Having a characters in the image means that Character has 
> instances. If alInstances method cannot report about them, it shall fire 
> exception perhaps, or, name allInstances must be changed to something 
> else, isn't it?

Instance has two meanings.

* the first one is as you explain it. This is usually the meaning 
intended in all textbooks and applies to the overall object model (e.g. 
$a isKindOf: Object is true).

* The second one is an object allocated in memory and is the one of most 
interest in practice. Such objects need memory allocation, reference 
counting and garbage collection services. The method allInstances uses 
the word instances in the latter sense. Immediate objects don't need 
these services, so they are not considered. (e.g. $a class 
isImmediateClass is true).

This is like calling 45, 045 or 0045 as two digit numbers because 
leading zeros are not significant in practice.

Could you explain the context behind your question?

Regards .. Subbu


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