At Thu, 31 Mar 2016 15:00:35 -0700 (PDT), Pedro Caldeira wrote: > Hello everyone, > > I am trying to use a set of bindings to SDL2 and I am at loss on how to use C > unions. > > If I understood correctly both make-union-type and _union procedures create a > new ctype; but how do you actually create instances of these unions?
One way is to use `malloc` to allocate space and `ptr-ref` to treat the memory as a union: #lang racket (require ffi/unsafe) (define _iord (_union _int64 _double)) (define u (ptr-ref (malloc _iord) _iord)) (union-set! u 1 4.2) (union-ref u 0) -- 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]. For more options, visit https://groups.google.com/d/optout.
