Hello :) 2013/11/30 Mark H Weaver <m...@netris.org>
> > Although it's not in the manual, we already have this. It's called > 'match-lambda' and 'match-lambda*' in (ice-9 match). 'match-lambda' > creates a procedure that accepts a single argument, and does pattern > matching on that argument. 'match-lambda*' matches the entire argument > list. > > (use-modules (ice-9 match)) > (define f (match-lambda ((a . b) (+ a b)))) > (f (cons 3 4)) => 7 > > My implementation actually does use the match-lambda* macro. The whole idea was to extend the possibilities of the "regular" lambda, just like the (ice-9 curried-definitions) extends the way the define form can be used. For the time being, the notation (lambda ((x y)) ...) is illegal, although I believe that it's quite comprehensible and natural, and using it doesn't decrease the understandability of the program, while making it more concise.
