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{-# LANGUAGE ScopedTypeVariables #-}
module ControlMaybe where
-- import GHC.IO.Exception (IOException(..))
import Control.Exception as Exception (IOException(..),catch)
withJust :: Monad m => Maybe x -> (x -> m ()) -> m ()
withJust (Just x) f = f x
withJust Nothing f = return ()
whenJust :: Monad m => m (Maybe x) -> (x -> m ()) -> m ()
whenJust acn f = do
x <- acn
withJust x f
catchIO_ :: IO a -> IO a -> IO a
catchIO_ a h = Exception.catch a (\(_ :: IOException) -> h)
catchIO :: IO a -> (IOException -> IO a) -> IO a
catchIO body handler = Exception.catch body handler
handleIO_ :: IO a -> IO a -> IO a
handleIO_ = flip catchIO_
handleIO :: (IOException -> IO a) -> IO a -> IO a
handleIO = flip catchIO
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