thank you, Claude! Vasili
On Th, Jun 5, 2008 at 4:21 AM, Claude Heiland-Allen < [EMAIL PROTECTED]> wrote: > Galchin, Vasili wrote: > >> Hello, >> >> I want to model a Haskell function that is a callback from C. I have >> only found one example in the unix package's Semaphore.hsc, which >> apparently >> is not used. I want to be able to marshall a Haskell function that is a >> first class citizen residing in a Haskell data type and pass to a C >> function >> via FFI. Are there examples of this? >> > > Attached is a simple example. > > The main thing to note is 'foreign import ccall "wrapper"' which gives you > a factory for turning Haskell functions into foreign function pointers. > > More information: > > http://www.cse.unsw.edu.au/~chak/haskell/ffi/<http://www.cse.unsw.edu.au/%7Echak/haskell/ffi/> > > > Claude > -- > http://claudiusmaximus.goto10.org > > > CallBacker: CallBacker.hs callerback.c callerback.h > ghc -O2 -Wall -fffi -o CallBacker CallBacker.hs callerback.c > >
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