On 22 April 2005 16:18, Dimitry Golubovsky wrote:

I am trying to generalize my knowledge about FFI declarations when dealing with pointers to pointers (import from C to Haskell). Maybe these are silly questions, but It seems to me, I am missing some understanding.

Per the FFI Addendum:

For a variable, we use "&" import:

int bar;

foreign import ccall "&" bar :: Ptr CInt

The syntax you want is foreign import ccall "&bar" :: Ptr CInt But note that GHC 6.4 has a bug whereby this doesn't work as expected when compiling via C. Either use the native code generator (-fasm) or wait for 6.4.1. Cheers, Simon