On Mon, 22 Jan 2007 10:46:15 +0100
Andy Wingo <[EMAIL PROTECTED]> wrote:
> Have you tried generics? A couple minutes of tinkering didn't give me
> the right incantation, but it should be something like:
>
> (use-modules (oop goops))
> (define apply (ensure-generic apply))
> (define-method (apply proc (x <vector>)) ...)
Hi Andy
Many thanks for that! It hadn't occurred to me. The stuff below does
what I want with apply. Now I need to figure out how to get this version
of apply into the top-level REPL. At the moment:
guile> (define tvec (vector cos sin))
guile> (apply tvec '(3.1415))
#(-0.999999995707656 9.26535896609343e-5)
guile> (tvec 3.1415)
<unnamed port>:12:1: In expression (tvec 3.1415):
<unnamed port>:12:1: Wrong type to apply: #(#<procedure cos (z)>
#<procedure sin (z)>)
ABORT: (misc-error)
Type "(backtrace)" to get more information or "(debug)" to enter the
debugger.
guile>
I have tried starting a new (top-repl) after defining apply but that
doesn't work. Any ideas anyone?
Cheers
Ian
;; Here's the code
(use-modules (oop goops))
(define apply (ensure-generic apply))
(define (vapp vec args)
(list->vector (map (lambda (p) (apply p args)) (vector->list vec))))
(define-method (apply (vec <vector>) args) (vapp vec args))
;; To test:
(define tvec (vector cos sin))
(apply tvec '(3.1415))
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