Yes, I can. Thanks. Just forget my idea, with this I can provide all those types in a library. I'm confused. When is it possible to use a type as a parameter to a foreign function call? My first guess was that I had to provide an instance for class Storable, but after I tried writing a complex-like type that way GHC told me my type was unaceptable. So I thought only types allowed by the compiler (including forall a. Ptr a) could be used that way. What is the rule? I've read all of FFI report and found nothing. Did I miss something? How can I make a type of mine acceptable? Why are Data.Int acceptable, and how could I know that? Thanks, Maurício
I think you can use Data.Word and Data.Int types for this, that is. (...)
After reading an ISO draft for standard C, I found a few types that could be usefull when binding to libraries (these are from
): int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, int64_t, uint64_t
(...)