Luís Oliveira wrote:
>I suppose defcenum shouldn't force the user to use keywords though?
Certainly not! Where would you get their value from if they are interned into
the keyword package.
BTW, I think a SWITCH macro would be a useful companion to ENUM. It's CASE
where you can put such things into the selector clauses.
Instead of
(case event-type
(#.SDL-keyboard-event[-enum] (do-this)) ...
...
or
(cond
((if (eql event-type SDL-keyboard-event[-enum]) ...
((if ...
or
(cond
((if (enum-eq? event-type SDL-keyboard-event) ...)
...
BTW, I hate enums in Lisp and the explosion of constants etc. that they cause.
I'm not convinced DEFCONSTANT is appropriate. Maybe all is needed is a mapping
from name to values (and vice-versa, the CLISP FFI has it), and nice useable
forms like the above SWITCH to hide ugliness.
BTW, DEFCONSTANT won't help with types like (:array :character MAX_PATH)
which once again, shows that it's not a good translation of C. It's just
widespread.
(:array :character #.MAX_PATH) is also ugly, but I've never thought about
finding something better.
FWIW, remember to wrap such uses of defconstant into EVAL-when also compile.
Regards,
Jörg Höhle
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