neither-0.1.0: Provide versions of Either with good monad and applicative instances. Source code Contents Index

Control.Monad.Invert

Contents Typeclass Exceptions Memory allocation

Synopsis

class MonadIO m => MonadInvertIO m where data InvertedIO m :: * -> * type InvertedArg m invertIO :: m a -> InvertedArg m -> IO (InvertedIO m a) revertIO :: (InvertedArg m -> IO (InvertedIO m a)) -> m a finally :: MonadInvertIO m => m a -> m b -> m a catch :: (Exception e, MonadInvertIO m) => m a -> (e -> m a) -> m a block :: MonadInvertIO m => m a -> m a unblock :: MonadInvertIO m => m a -> m a bracket :: MonadInvertIO m => m a -> (a -> m b) -> (a -> m c) -> m c bracket_ :: MonadInvertIO m => m a -> m b -> m c -> m c onException :: MonadInvertIO m => m a -> m b -> m a alloca :: (Storable a, MonadInvertIO m) => (Ptr a -> m b) -> m b allocaBytes :: MonadInvertIO m => Int -> (Ptr a -> m b) -> m b withForeignPtr :: MonadInvertIO m => ForeignPtr a -> (Ptr a -> m b) -> m b

Typeclass

class MonadIO m => MonadInvertIO m where Source

Associated Types data InvertedIO m :: * -> * Source type InvertedArg m Source Methods invertIO :: m a -> InvertedArg m -> IO (InvertedIO m a) Source revertIO :: (InvertedArg m -> IO (InvertedIO m a)) -> m a Source Instances MonadInvertIO IO MonadInvertIO m => MonadInvertIO (IdentityT m) (Monoid w, MonadInvertIO m) => MonadInvertIO (WriterT w m) MonadInvertIO m => MonadInvertIO (StateT s m) MonadInvertIO m => MonadInvertIO (ReaderT r m) (Error e, MonadInvertIO m) => MonadInvertIO (ErrorT e m) MonadInvertIO m => MonadInvertIO (MEitherT e m)

Exceptions

finally :: MonadInvertIO m => m a -> m b -> m a Source

catch :: (Exception e, MonadInvertIO m) => m a -> (e -> m a) -> m a Source

block :: MonadInvertIO m => m a -> m a Source

unblock :: MonadInvertIO m => m a -> m a Source

bracket :: MonadInvertIO m => m a -> (a -> m b) -> (a -> m c) -> m c Source

There is a very important distinction between this function and bracket_: in this version, the monadic side effects from the initialization function and kept, while in bracket_ they are discarded.

bracket_ :: MonadInvertIO m => m a -> m b -> m c -> m c Source

See bracket.

onException :: MonadInvertIO m => m a -> m b -> m a Source

Memory allocation

alloca :: (Storable a, MonadInvertIO m) => (Ptr a -> m b) -> m b Source

allocaBytes :: MonadInvertIO m => Int -> (Ptr a -> m b) -> m b Source

withForeignPtr :: MonadInvertIO m => ForeignPtr a -> (Ptr a -> m b) -> m b Source

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