SortedCollection with IdentitySet and Index - an alternative ?

Is it possible to use an IdentitySet with index structure as some kind of SortedCollection ? Has anyone tried this ? Is the index structure available to get the first or the last item of that Set ?

| set stream |

set := IdentitySet withAll: #(1 3 5 7 9).

set createEqualityIndexOn: '' withLastElementClass: Integer.

set equalityIndexedPaths.

stream := set selectAsStream: {:each | each > 0}.

stream next -> stream reversed next "1 -> 9"

Yes I know this and I have to investigate this further on - perhaps in the next release of our software I can change all my SortedCollection to IdentitySets with equality indices and I hope to get much better performance and translog behaviour.

Normally I just need some kind of next, first, removeFirst, last, removeLast and stuff like this ...

Marten

I've writte a blog entry about this topic:

https://schrievkrom.wordpress.com/2018/04/14/gemstone-s-3-4-0-speed-comparision-sortedcollection-against-identityset/

Marten