Are there plans to include C99 'complex' type in Foreign, maybe as CFloatComplex, CDoubleComplex A separate library for new types to add to Foreign would be the easiest way forward. Just put the foreign-c99 package on Hackage? (...) I could actually have some arbitrary sized parameter as argument to a function or as a return value (and not its pointer), what did I saw wrong? I understand only Foreign.C.C* types or forall a. => Foreign.Ptr.Ptr a can be used like that. Oh, you mean you need to teach the compiler about unboxed complex types?
I'm sorry, maybe I didn't understand you well. Are you saying that I could get this 'CComplex' type using unboxed types and other things already available?
Yes, because the C standard guarantees that a complex <type> is stored as <type>[2].
I have been using the following, for binding to FFTW:
The way you wrote CComplex a, is it possible to write foreign import ccall "somename" somename :: CComplex CDouble -> IO CComplex CDouble ? Thanks, Maurício