From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Ichbiah 2022 compiler mode
Date: Sat, 14 Sep 2024 01:18:25 -0500 [thread overview]
Message-ID: <vc39rl$1b1jo$1@dont-email.me> (raw)
In-Reply-To: vbvpmt$esm6$7@dont-email.me
"Lawrence D'Oliveiro" <ldo@nz.invalid> wrote in message
news:vbvpmt$esm6$7@dont-email.me...
> On Wed, 11 Sep 2024 23:39:27 -0500, Randy Brukardt wrote:
>
>> "Lawrence D'Oliveiro" <ldo@nz.invalid> wrote in message
>> news:vbdk2t$hj0r$6@dont-email.me...
>>> On Thu, 5 Sep 2024 19:03:22 -0500, Randy Brukardt wrote:
>> ...
>>>> (10) Variable-returning functions are introduced.
>>>
>>> Is this like updater functions in POP-11, or "setf" in Lisp?
>>
>> No, it is a function that returns a variable, meaning you can assign
>> into the function result.
>
> I think an updater function would be more generally useful. Because some
> things you want to update might not (depending on the implementation) live
> independently in an explicit variable. And it seems good not to constrain
> implementations unnecessarily.
Unfortunately, "updater" functions don't work with the Ada model of
components, because you can't tell what to do when a component appears or
disappears in an assignment. (That's why Ada doesn't allow overloading
":=".) And composition is very important to Ada -- stand-alone objects are
pretty rare outside of those for scalar types. I don't think something that
only worked with stand-alone objects would be very useful (can't use those
with ODTs, for instance)..
Randy.
next prev parent reply other threads:[~2024-09-14 6:18 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-05 11:52 Ichbiah 2022 compiler mode Kevin Chadwick
2024-09-05 13:40 ` Jeffrey R.Carter
2024-09-05 13:49 ` Bill Findlay
2024-09-05 19:22 ` Jeffrey R.Carter
2024-09-05 14:05 ` Kevin Chadwick
2024-09-05 16:08 ` Kevin Chadwick
2024-09-05 19:24 ` Jeffrey R.Carter
2024-09-06 0:03 ` Randy Brukardt
2024-09-06 0:58 ` Lawrence D'Oliveiro
2024-09-12 4:39 ` Randy Brukardt
2024-09-12 22:24 ` Lawrence D'Oliveiro
2024-09-14 6:18 ` Randy Brukardt [this message]
2024-09-14 7:18 ` Lawrence D'Oliveiro
2024-09-06 21:22 ` Simon Wright
2024-09-07 17:13 ` Niklas Holsti
2024-09-07 20:34 ` Nioclás Pól Caileán de Ghloucester
2024-09-12 4:46 ` Randy Brukardt
2024-09-12 7:42 ` Niklas Holsti
2024-09-12 9:07 ` Dmitry A. Kazakov
2024-09-12 12:36 ` Kevin Chadwick
2024-09-12 15:43 ` Niklas Holsti
2024-09-13 20:45 ` Nioclás Pól Caileán de Ghloucester
2024-09-12 9:04 ` J-P. Rosen
2024-09-12 11:35 ` Niklas Holsti
2024-09-14 6:13 ` Randy Brukardt
2024-09-14 6:47 ` Dmitry A. Kazakov
2024-09-14 7:19 ` Lawrence D'Oliveiro
2024-09-14 8:12 ` Niklas Holsti
2024-09-06 11:07 ` Jeffrey R.Carter
2024-09-06 20:26 ` Nioclás Pól Caileán de Ghloucester
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