[Dev] collections and notifications meetup

[Andi Vajda]

On Wed, 8 Feb 2006, Morgen Sagen wrote:

>
> On Feb 8, 2006, at 10:12 PM, Katie Capps Parlante wrote:
>
>> Several folks have expressed interest in getting people together to talk 
>> about collections and notifications, and what we should do in 0.7.
>> 
>> Here's a short list of problems as I understand them:
>> 
>> Any others to add to the list?
>
> A small detail we need to fix:  ListCollection doesn't maintain its intrinsic 
> sort order after an index has been added.

The problem is that a ListCollection has no intrinsic order. It wraps a Set 
around a ref collection. A ref collection has intrinsic order but a Set does 
not. For performance reasons, when a Set (hence any Collection item) is 
iterated, and it has an index, the index is iterated instead. This could of 
course be changed but it seems that the requirements are conflicting a bit 
here.
This touches also on the age-old debate about the point of having hardwired 
collection items (ListCollection is hardwired around an attribute called 
'refCollection', and all collection items are hardwired around a 'rep' Set 
attribute). I suspect this might also come up in the meeting Katie just 
called.

Andi..

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