Sujet : Re: defining self-evaluating objects
De : HenHanna (at) *nospam* dev.null (HenHanna)
Groupes : comp.lang.lisp comp.lang.schemeDate : 21. Oct 2024, 23:36:08
Autres entêtes
Organisation : novaBBS
Message-ID : <245b3f586d6d45b8d64786399ec4d3f5@www.novabbs.com>
References : 1 2
User-Agent : Rocksolid Light
On Thu, 13 Apr 2023 1:15:33 +0000, Tom Russ wrote:
On Wednesday, April 12, 2023 at 9:41:10 AM UTC-7, James Cloos wrote:
does cl support defining new self-evaluating objects
(other than keywords)?
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if so, how?
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What sort of "defining" did you have in mind.
One simple answer (for symbols) would be:
(defconstant foo 'foo)
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There may be other things you could do via reader macros.
One example of that is https://github.com/lispm/measures [*], which
defined
numbers with dimensions and optional reader macros so that something
like
35km or 18m/s2 would evaluate to equivalent objects, although not in an
EQ sense.
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>
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[* Software by Rainer Joswig that I extended while at ISI]
Do we have Defconstant in Scheme ???
Re: defining self-evaluating objects