* (define* (((f a) b) c) ...)
@ 2011-03-13 15:49 Dan Gildea
2011-03-15 8:37 ` Ludovic Courtès
0 siblings, 1 reply; 2+ messages in thread
From: Dan Gildea @ 2011-03-13 15:49 UTC (permalink / raw)
To: guile-user
In guile 2.0, I need to use "define*" to define second-order functions
such as:
(define* ((f a) b)
...)
But define* doesn't work for higher-order functions, or for more
complicated definitions of second-order functions, such as:
(define* (((f a) b) c)
...)
(define* ((f #:optional a) b)
...)
These forms are very common in the scmutils mechanics functions.
Is there any way around this, other than using lambda, as in:
(define* ((f a) b)
(lambda (c)
...))
(define* (f #:optional a)
(lambda (b)
...))
?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: (define* (((f a) b) c) ...)
2011-03-13 15:49 (define* (((f a) b) c) ...) Dan Gildea
@ 2011-03-15 8:37 ` Ludovic Courtès
0 siblings, 0 replies; 2+ messages in thread
From: Ludovic Courtès @ 2011-03-15 8:37 UTC (permalink / raw)
To: Dan Gildea; +Cc: guile-user
Hi,
Dan Gildea <gildea@cs.rochester.edu> writes:
> In guile 2.0, I need to use "define*" to define second-order functions
> such as:
>
> (define* ((f a) b) ...)
You should use (ice-9 curried-definitions) for this (see NEWS), and...
> But define* doesn't work for higher-order functions, or for more
> complicated definitions of second-order functions, such as:
>
> (define* (((f a) b) c) ...)
>
> (define* ((f #:optional a) b) ...)
it also works for optional/keyword arguments:
--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> (use-modules(ice-9 curried-definitions))
scheme@(guile-user)> (define* ((f #:optional a) b) (list a b))
scheme@(guile-user)> ((f) 2)
$2 = (#f 2)
scheme@(guile-user)> ((f 1) 2)
$3 = (1 2)
--8<---------------cut here---------------end--------------->8---
Hope this helps,
Ludo’.
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