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{-# LANGUAGE ExistentialQuantification, DeriveDataTypeable, StandaloneDeriving #-}
module Phi.Phi ( Phi
, Message
, DefaultMessage(..)
, fromMessage
, initPhi
, sendMessage
, receiveMessage
) where
import Control.Concurrent.Chan
import Control.Monad
import Data.Typeable
data Phi = Phi (Chan Message)
data Message = forall a. (Typeable a, Show a) => Message a
deriving instance Show Message
data DefaultMessage = Repaint deriving (Typeable, Show)
fromMessage :: (Typeable a, Show a) => Message -> Maybe a
fromMessage (Message m) = cast m
initPhi :: IO Phi
initPhi = liftM Phi newChan
sendMessage :: (Typeable a, Show a) => Phi -> a -> IO ()
sendMessage (Phi chan) = writeChan chan . Message
receiveMessage :: Phi -> IO Message
receiveMessage (Phi chan) = readChan chan
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