William Tanksley wrote:
> I have a question for the more historically literate than myself:
> would these more accurately be called "FP combinators" rather than
> "concatenative combinators"? My understanding is that this combinator
> style originated with the applicative FP/FL languages.
Hi William,
This style is definately close to FP, FL etc. (For those interested in
FP check out the "Furry Paws" FP compiler.)
FP's "construction" operator is like Factor's 'cleave', but closer to a
"cleave to array".
I listed 'bi' as:
(define (bi f g c)
(lambda (x)
(c (f x)
(g x))))
What about 'cleave' in Scheme? As a macro it's:
(define-syntax cleave
(lambda (stx)
(syntax-case stx ()
( (cleave (f ...) c)
(with-syntax (((x ...) (generate-temporaries (syntax (f ...)))))
(syntax
(lambda (x ...)
(c (f x)
...)))) ))))
> ((cleave (sqrt sin cos) list) 4 0 0)
(2 0 1)
>
Ed
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