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... is implemented by ...

module Quux where

import Foreign.C.Types

foreign export ccall quux :: CFloat -> IO CFloat

quux :: CFloat -> IO CFloat
quux f = return (f * f * f);

... plus a load of ugly C wrapper code. Requires: 'ghc', 'gcc', 'pd', 'make', and probably quite some luck to get it to compile and work...

References:

• Haskell
• The Haskell 98 Foreign Function Interface 1.0
• Using FFI with GHC
• Pure-data
• HOWTO write an External for Pd
• py/pyext - python script objects for Pd (the inspiration for all this)