UnliftIO.Resource

Unlifted Control.Monad.Trans.Resource.

Since: 0.1.0.0

Documentation

data ResourceT m a :: (* -> *) -> * -> *

The Resource transformer. This transformer keeps track of all registered actions, and calls them upon exit (via runResourceT). Actions may be registered via register, or resources may be allocated atomically via allocate. allocate corresponds closely to bracket.

Releasing may be performed before exit via the release function. This is a highly recommended optimization, as it will ensure that scarce resources are freed early. Note that calling release will deregister the action, so that a release action will only ever be called once.

Since 0.3.0

Instances

MMonad ResourceT

Since 0.4.7

Methods

embed :: Monad n => (forall a. m a -> ResourceT n a) -> ResourceT m b -> ResourceT n b

MonadTrans ResourceT

Methods

lift :: Monad m => m a -> ResourceT m a

MonadTransControl ResourceT

Associated Types

type StT (ResourceT :: (* -> *) -> * -> *) a :: *

Methods

liftWith :: Monad m => (Run ResourceT -> m a) -> ResourceT m a

restoreT :: Monad m => m (StT ResourceT a) -> ResourceT m a

MonadRWS r w s m => MonadRWS r w s (ResourceT m)

MonadBaseControl b m => MonadBaseControl b (ResourceT m)

Associated Types

type StM (ResourceT m :: * -> *) a :: *

Methods

liftBaseWith :: (RunInBase (ResourceT m) b -> b a) -> ResourceT m a

restoreM :: StM (ResourceT m) a -> ResourceT m a

MonadBase b m => MonadBase b (ResourceT m)

Methods

liftBase :: b α -> ResourceT m α

MonadError e m => MonadError e (ResourceT m)

Methods

throwError :: e -> ResourceT m a

catchError :: ResourceT m a -> (e -> ResourceT m a) -> ResourceT m a

MonadReader r m => MonadReader r (ResourceT m)

Methods

ask :: ResourceT m r

local :: (r -> r) -> ResourceT m a -> ResourceT m a

reader :: (r -> a) -> ResourceT m a

MonadState s m => MonadState s (ResourceT m)

Methods

get :: ResourceT m s

put :: s -> ResourceT m ()

state :: (s -> (a, s)) -> ResourceT m a

MonadWriter w m => MonadWriter w (ResourceT m)

Methods

writer :: (a, w) -> ResourceT m a

tell :: w -> ResourceT m ()

listen :: ResourceT m a -> ResourceT m (a, w)

pass :: ResourceT m (a, w -> w) -> ResourceT m a

Monad m => Monad (ResourceT m)

Methods

(>>=) :: ResourceT m a -> (a -> ResourceT m b) -> ResourceT m b

(>>) :: ResourceT m a -> ResourceT m b -> ResourceT m b

return :: a -> ResourceT m a

fail :: String -> ResourceT m a

Functor m => Functor (ResourceT m)

Methods

fmap :: (a -> b) -> ResourceT m a -> ResourceT m b

(<$) :: a -> ResourceT m b -> ResourceT m a

MonadFix m => MonadFix (ResourceT m)

Since: 1.1.8

Methods

mfix :: (a -> ResourceT m a) -> ResourceT m a

Applicative m => Applicative (ResourceT m)

Methods

pure :: a -> ResourceT m a

(<*>) :: ResourceT m (a -> b) -> ResourceT m a -> ResourceT m b

(*>) :: ResourceT m a -> ResourceT m b -> ResourceT m b

(<*) :: ResourceT m a -> ResourceT m b -> ResourceT m a

Alternative m => Alternative (ResourceT m)

Since 1.1.5

Methods

empty :: ResourceT m a

(<|>) :: ResourceT m a -> ResourceT m a -> ResourceT m a

some :: ResourceT m a -> ResourceT m [a]

many :: ResourceT m a -> ResourceT m [a]

MonadPlus m => MonadPlus (ResourceT m)

Since 1.1.5

Methods

mzero :: ResourceT m a

mplus :: ResourceT m a -> ResourceT m a -> ResourceT m a

MonadIO m => MonadIO (ResourceT m)

Methods

liftIO :: IO a -> ResourceT m a

MonadThrow m => MonadThrow (ResourceT m)

Methods

throwM :: Exception e => e -> ResourceT m a

MonadCatch m => MonadCatch (ResourceT m)

Methods

catch :: Exception e => ResourceT m a -> (e -> ResourceT m a) -> ResourceT m a

MonadMask m => MonadMask (ResourceT m)

Methods

mask :: ((forall a. ResourceT m a -> ResourceT m a) -> ResourceT m b) -> ResourceT m b

uninterruptibleMask :: ((forall a. ResourceT m a -> ResourceT m a) -> ResourceT m b) -> ResourceT m b

MonadLogger m => MonadLogger (ResourceT m)

Methods

monadLoggerLog :: ToLogStr msg => Loc -> LogSource -> LogLevel -> msg -> ResourceT m ()

MonadLoggerIO m => MonadLoggerIO (ResourceT m)

Methods

askLoggerIO :: ResourceT m (Loc -> LogSource -> LogLevel -> LogStr -> IO ())

MonadCont m => MonadCont (ResourceT m)

Methods

callCC :: ((a -> ResourceT m b) -> ResourceT m a) -> ResourceT m a

(MonadThrow m, MonadBase IO m, MonadIO m, Applicative m) => MonadResource (ResourceT m)

Methods

liftResourceT :: ResourceT IO a -> ResourceT m a

MFunctor * ResourceT

Since 0.4.7

Methods

hoist :: Monad m => (forall a. m a -> n a) -> t m b -> t n b

type StT ResourceT a

type StT ResourceT a = a

type StM (ResourceT m) a

type StM (ResourceT m) a = StM m a

runResourceT :: MonadUnliftIO m => ResourceT m a -> m a

Unlifted version of runResourceT.

Since: 0.1.0.0

liftResourceT :: MonadIO m => ResourceT IO a -> ResourceT m a

Lifted version of liftResourceT.

Since: 0.1.0.0