Den ons. 27. maj 2020 kl. 19.27 skrev George Neuner <[email protected]>:
> > On 5/27/2020 6:34 AM, Jens Axel Søgaard wrote: > > > > In standard Racket an application doesn't communicate how many values > > a function is expected to produce. > > You can ask: see procedure-result-arity > https://docs.racket-lang.org/reference/procedures.html I think procedure-result-arity answers the question "how many values could this procedure return?" and not "how many values is the procedure expected to return in this context?". > > I have written a small proof-of-concept of an assignment operator := > > that communicates to a function how many extra values it is expected > > to produce (and still works with standard functions). > > > > Are there alternative solutions that are better than the "use a > > keyword" approach? > > You can use call-with-values which connects the function that produces > with the one that consumes, but they have to agree on the number of > values being passed or it won't work. > My problem is that the producer still needs to be told how many values to produce. /Jens Axel -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CABefVgwy4YEPcswLjLEf-FN2sZMa2xbPqOWxOJ%3DdOEnEUF6_Hg%40mail.gmail.com.
