hscurses-1.3: NCurses bindings for Haskell Contents Index

UI.HSCurses.MonadException

Documentation

class Monad m => MonadExc m where

Methods catchM :: m a -> (Exception -> m a) -> m a blockM :: m a -> m a unblockM :: m a -> m a Instances MonadExc IO MonadExc m => MonadExc (StateT s m)

class (MonadIO m, MonadExc m) => MonadExcIO m

Instances MonadExcIO IO (MonadExc m, MonadIO m) => MonadExcIO (StateT s m)

catchJustM

:: MonadExc m => Exception -> Maybe b Predicate to select exceptions -> m a Computation to run -> b -> m a Handler -> m a

handleM :: MonadExc m => (Exception -> m a) -> m a -> m a

handleJustM :: MonadExc m => (Exception -> Maybe b) -> (b -> m a) -> m a -> m a

tryM :: MonadExc m => m a -> m (Either Exception a)

tryJustM :: MonadExc m => (Exception -> Maybe b) -> m a -> m (Either b a)

catchDynM :: (MonadExc m, Typeable exc) => m a -> (exc -> m a) -> m a

bracketM

:: MonadExc m => m a computation to run first ("acquire resource") -> a -> m b computation to run last ("release resource") -> a -> m c computation to run in-between -> m c

bracketM_ :: MonadExc m => m a -> m b -> m c -> m c

finally

:: => IO a computation to run first -> IO b computation to run afterward (even if an exception was raised) -> IO a

modifyState :: MonadExc m => (s -> m (a, s)) -> StateT s m a

catchState :: MonadExc m => StateT s m a -> (Exception -> StateT s m a) -> StateT s m a

unblockState :: MonadExc m => StateT s m a -> StateT s m a

blockState :: MonadExc m => StateT s m a -> StateT s m a

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