Re: Optional arguments for scheme functions

[Aaron Hill]

On 2020-04-26 10:01 am, David Kastrup wrote:
> Predicates used in argument parsing have to be "primary" in that they
> have to deliver a result for anything thrown at them.
>
> positive? only delivers results for numbers but throws an error for
> anything else.

Would there be harm in redefining an R5RS primitive?

;;;;
(define (positive? arg) (and (number? arg) (< 0 arg))
;;;;


-- Aaron Hill