For general Lisp questions, the usenet group comp.lang.lisp is
probably more appropriate. But, to answer your question...
Paulo J. Matos writes:
> I'm trying to call an OR without using eval. The idea is that I
> have a function that returns a list of T's and NILs and I want to
> or the list. I've tried:
> * (apply #'or '(t t t nil))
>
> OR is a macro.
Yep. There are a variety of ways to accomplish what you want to do,
that don't involve APPLYing OR (using MEMBER, FIND-IF, EVERY, etc).
> The only way I found out is:
> * (eval `(or ,@(funcall #'(lambda () '(t t nil)))))
> T
To answer your question about how to apply something like OR, you can
wrap it in a function. EG:
(reduce #'(lambda (a b) (or a b))
'(t t nil))
or
(flet ((or-fn (&rest args)
(reduce #'(lambda (a b) args))))
(apply #'or-fn '(t t nil)))
> Anyway, people say eval shouldn't be used. Is there any other
> suggestion?
This is a good example of why people say that :). It's not that EVAL
is evil, but that until you're really comfortable with Lisp, you'll
probably be using it for something like this, that can be done better
another way.
--
/|_ .-----------------------.
,' .\ / | No to Imperialist war |
,--' _,' | Wage class war! |
/ / `-----------------------'
( -. |
| ) |
(`-. '--.)
`. )----'
