Look for evcase. -- Matthias
On Dec 21, 2014, at 11:58 PM, J Arcane wrote: > Up with a horrible ear-ache this morning I decided to include a FizzBuzz > example in Heresy, the Racket #lang I've been working on, and ran into an > unexpected behavior in the (case ...) statement. > > In many languages with case, you can make the testing value a constant, and > then make the matching clauses actual calculations which then match against > that constant. So when doing FizzBuzz in C-like languages you can do > something like "switch 0" and then "case x % 3" for the matching clauses. > > It turns out this doesn't work in Racket, because Racket quotes the values in > the matching clauses so they do not evaluate. Specifically, it narrows down > to doing this in (case/sequential-test ...): #`(equal? v 'k) > > I can implement an alternate version that works as I expect (and will > probably include it in Heresy) just by removing that quote in my version, but > I was curious as to the reasoning behind this behavior and if perhaps there's > some explanation for it that I may've missed. > > Any insights appreciated, > John Berry > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
