quick LISP question

[RichieZ]

How do you specify default values for a keywords?

for example:

(defun test (&key x y)
(list x y))

how do i make the default value for x 1 and y 2

an example given in the book i'm using looks something like this:

(defun test (&key x y) '(🙂x 1)🙂y 2))
(list x y))

but this doesn't do anything, x and y are still both nil

I'm using Allegro CL

 

[JSClark]

I assume you're talking about a LISP routine for AutoCAD? You can look in AutoCAD's support directory and look at the file acad.mns (I think - its been a while), and that should be a good example there...

 

[RichieZ]

never mind i got it, its just like optional arguments.

I HATE ANSI COMMON LISP BY PAUL GRAHAM!

 

[JSClark]

Originally posted by: RichieZ
never mind i got it, its just like optional arguments.

I HATE ANSI COMMON LISP BY PAUL GRAHAM!

LOL, I didn't have a book when I was editing AutoLISP routines for my old company. I had to use the online help resource that came with Land Development Desktop 2000i 😀