ghc-6.10.1: The GHC API Contents Index

Maybes

Documentation

data MaybeErr err val

Constructors Succeeded val Failed err Instances Monad (MaybeErr err)

failME :: err -> MaybeErr err val

isSuccess :: MaybeErr err val -> Bool

orElse :: Maybe a -> a -> a

mapCatMaybes :: (a -> Maybe b) -> [a] -> [b]

allMaybes :: [Maybe a] -> Maybe [a]

firstJust :: [Maybe a] -> Maybe a

expectJust :: String -> Maybe a -> a

maybeToBool :: Maybe a -> Bool

newtype MaybeT m a

Constructors MaybeT runMaybeT :: m (Maybe a) Instances Monad m => Monad (MaybeT m) Functor m => Functor (MaybeT m)

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