XPost: comp.lang.scheme

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)?

if so, how?

What sort of "defining" did you have in mind.
One simple answer (for symbols) would be:
(defconstant foo 'foo)

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.

[* Software by Rainer Joswig that I extended while at ISI]

Do we have Defconstant in Scheme ???

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