[m-users.] lists and sets, unordered or ordered.

[Sean Charles (emacstheviking)]

Indeed. nothing in my drafts folder and I swear it was complete before I hit send... well,
basically,
is there a reason you can't get an unsorted de-duped list from a set?

That's all...   :D

> On 3 Oct 2023, at 21:53, Volker Wysk <post at volker-wysk.de> wrote:
> 
> Hi, Sean
> 
> Your message suddenly stops in the middle of a sentence.
> 
> Volker
> 
> Am Dienstag, dem 03.10.2023 um 21:39 +0100 schrieb Sean Charles
> (emacstheviking):
>> I've just completed a generic typeclass based collision detection system and learned quite a bit doing it!
>> 
>> As I was reading the module docs, it seems that there is no 'unordered set without duplicates' unless I missed it, which is entirely reasonable.
>> 
>> The output from the collision detection  is two sets of integers, these are the identifiers of the missiles and the things that were hit at the moment. I now want to take this list and then set the '^hit' flag for every missile in that list, for example, the existing code will then no longer render it and remove it on the next iteration.
>> 
>> I used sets because they de-dupe as you go, meaning that my checking process is simply iterating two loops, m x n, m missiles and n moving targets, for now it is naive and will probably always be fine given the limited numbers of things on screen at any one time.
>> 
>> There seems to be no way to get an unordered, deduplicated list from a set, I can use set_unordlist but that leaves duplicates.
>> 
>> 
>> For now I've decided to use set_unordlist, at the cost of maybe updating the same missile record more than once poost-collision detection, it's not going to kill anything really but mentally, and from a purity point of view it feels 'less optimal' than I wanted. Failing that I might just usr  list.member and use lists for everything like I did!
>> 
>> I just wondered what the reasons were for not having the ability to get an unsorted 
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