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{-# LANGUAGE ExistentialQuantification, DeriveDataTypeable #-}
module GLDriver ( Driver(..)
, Event
, SomeEvent(..)
, QuitEvent(..)
, fromEvent
) where
import Data.Typeable
class Driver a where
initialized :: a -> Bool
initGL :: a -> IO a
deinitGL :: a -> IO ()
nextEvent :: a -> IO (Maybe SomeEvent)
class Typeable a => Event a
data SomeEvent = forall a. Event a => SomeEvent a
fromEvent :: Event a => SomeEvent -> Maybe a
fromEvent (SomeEvent a) = cast a
data QuitEvent = QuitEvent deriving Typeable
instance Event QuitEvent
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