Re: [m-users.] lists and sets, unordered or ordered.
"Sean Charles (emacstheviking)" <[email protected]>
| Newsgroups | gmane.comp.lang.mercury.general |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> 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 >> _______________________________________________ >> users mailing list >> [email protected] >> https://lists.mercurylang.org/listinfo/users > > _______________________________________________ > users mailing list > [email protected] > https://lists.mercurylang.org/listinfo/users _______________________________________________ users mailing list [email protected] https://lists.mercurylang.org/listinfo/users