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]

On Wednesday, April 12, 2023 at 6:15:36 PM UTC-7, 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.

A clarification, I meant that two instances of 35km and 35km would be equivalent
objects. And likewise for 18m/s2 and 18m/s2. As expected, 35km and 18m/s2 are
not equivalent.

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

>>>>> "TR" == Tom Russ <taruss@google.com> writes:

TR> One simple answer (for symbols) would be:
TR> (defconstant foo 'foo)

now i'm feeling stupid. ☺

that accomplished exactly what i was thiking of.

thanks.

-JimC
--
James Cloos <cloos@jhcloos.com> OpenPGP: 0x997A9F17ED7DAEA6