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Re: srfi-39 implementation

From: Kevin Ryde
Subject: Re: srfi-39 implementation
Date: Sun, 09 May 2004 10:48:04 +1000
User-agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux)

Jose A Ortega Ruiz <address@hidden> writes:
> I'd be glad to transfer the copyright to the FSF (if needed; it's
> barely 30 loc without comments)

Paperwork will be required if adopted.

> together with a little test program.

Tests are vital, you'll never know if it works if you don't exercise
all features.

>   #:use-module (ice-9 syncase)

I believe syncase is pretty big and not very fast.  define-macro or
similar is probably a better idea.  (And with enough quasiquote might
hide all helpers :).

> (define make-parameter
>   (case-lambda
>     ((val) (make-parameter/helper val (lambda (x) x)))
`identity' in boot-9.

> (define get-fluid-tag (lambda () 'get-fluid)) ;; arbitrary unique (as per 
> eq?) value

make-symbol perhaps.

> (define (make-parameter/helper val conv)

How does this stand in comparison to make-mutable-parameter in boot-9?
Similar but not quite the same?

>          ((eq? (car new-value) get-fluid-tag) value)
>          ((eq? (car new-value) get-conv-tag) conv)

Perhaps primitive-make-property or something to associate these,
instead of a function call.  (If I understand what it's trying to do.)

> (define (check a b a-val b-val)
>   (if (not (eqv? (a) a-val)) (error "failure -- a" (a) a-val))
>   (if (not (eqv? (b) b-val)) (error "failure -- b" (b) b-val)))

No, you should use the test-suite/lib.scm framework.

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