Email list hosting service & mailing list manager

iset-search implementations Wolfgang Corcoran-Mathe (08 Dec 2020 20:00 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (08 Dec 2020 20:18 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (09 Dec 2020 18:07 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (10 Dec 2020 12:00 UTC)
Re: iset-search implementations Arthur A. Gleckler (10 Dec 2020 16:40 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (10 Dec 2020 16:50 UTC)
Re: iset-search implementations Arthur A. Gleckler (10 Dec 2020 16:51 UTC)
Re: iset-search implementations John Cowan (11 Dec 2020 02:23 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (11 Dec 2020 02:47 UTC)
Re: iset-search implementations John Cowan (11 Dec 2020 03:04 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (11 Dec 2020 18:41 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (12 Dec 2020 10:59 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (14 Dec 2020 17:44 UTC)
Re: iset-search implementations John Cowan (16 Dec 2020 15:34 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (16 Dec 2020 15:42 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (31 Dec 2020 18:23 UTC)
Re: iset-search implementations John Cowan (07 Jan 2021 21:42 UTC)
Re: iset-search implementations Arthur A. Gleckler (08 Jan 2021 04:39 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (08 Jan 2021 13:31 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (08 Jan 2021 23:47 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (09 Jan 2021 13:28 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (10 Jan 2021 23:35 UTC)
Re: iset-search implementations Arthur A. Gleckler (11 Jan 2021 00:04 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (11 Jan 2021 06:33 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (11 Jan 2021 00:27 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (12 Jan 2021 14:34 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (12 Jan 2021 18:55 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (18 Jan 2021 09:13 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (19 Jan 2021 18:54 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (20 Jan 2021 10:53 UTC)
Re: iset-search implementations Wolfgang Corcoran-Mathe (21 Jan 2021 20:31 UTC)
Re: iset-search implementations Marc Nieper-Wißkirchen (11 Dec 2020 08:40 UTC)

Re: iset-search implementations Wolfgang Corcoran-Mathe 31 Dec 2020 18:23 UTC

On 2020-12-16 16:42 +0100, Marc Nieper-Wißkirchen wrote:
> > a) Remove the new-key argument altogether.
> >
> > b) Ignore the value of the new-key argument and always use the pre-existing key.
> >
> > c) Use the new-key argument, but make it an error to provide one that is not the same (in the sense of the equality predicate) as the old key.
> >
> > d) No PFNs needed; update the implementations to allow arbitrary new-key values.

I second Marc's wonder about option (c).  If the new key has to be
equal in the sense of the structure's equality relation, when does the
problem with eq? arise?

Unless I've missed something, (c) seems like the best option, for all
of the reasons already mentioned by John.  (d) is plausible, but it
will probably ruin the possibility of using *-search forms as general
traversers.  Taylor Campbell's comment on *-search without the same-key
restriction sums the situation up well, I think: "World's most
complicated lookup API that you have to define in terms of the simpler
ones!"

--
Wolfgang Corcoran-Mathe  <xxxxxx@sigwinch.xyz>

"As Will Rogers would have said, 'There is no such thing as a
free variable.'" --Alan J. Perlis