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Language	Haskell2010

Control.Monad.Trans.Unlift

Contents

Trans
Base
Reexports

Description

See overview in the README.md

Synopsis

class (MonadTransControl t, Forall (Identical t)) => MonadTransUnlift t
newtype Unlift t = Unlift {
- unlift :: forall a n. Monad n => t n a -> n a
}
askUnlift :: forall t m. (MonadTransUnlift t, Monad m) => t m (Unlift t)
askRun :: (MonadTransUnlift t, Monad (t m), Monad m) => t m (t m a -> m a)
class (MonadBaseControl b m, Forall (IdenticalBase m)) => MonadBaseUnlift b m | m -> b
newtype UnliftBase b m = UnliftBase {
- unliftBase :: forall a. m a -> b a
}
askUnliftBase :: forall b m. MonadBaseUnlift b m => m (UnliftBase b m)
askRunBase :: MonadBaseUnlift b m => m (m a -> b a)
class MonadTrans (t :: (Type -> Type) -> Type -> Type) where
- lift :: Monad m => m a -> t m a
class (Applicative b, Applicative m, Monad b, Monad m) => MonadBase (b :: Type -> Type) (m :: Type -> Type) | m -> b where
- liftBase :: b α -> m α
class MonadTrans t => MonadTransControl (t :: (Type -> Type) -> Type -> Type) where
- type StT (t :: (Type -> Type) -> Type -> Type) a
- liftWith :: Monad m => (Run t -> m a) -> t m a
- restoreT :: Monad m => m (StT t a) -> t m a
class MonadBase b m => MonadBaseControl (b :: Type -> Type) (m :: Type -> Type) | m -> b where
- type StM (m :: Type -> Type) a
- liftBaseWith :: (RunInBase m b -> b a) -> m a
- restoreM :: StM m a -> m a

Trans

class (MonadTransControl t, Forall (Identical t)) => MonadTransUnlift t Source #

A monad transformer which can be unlifted, obeying the monad morphism laws.

Since 0.1.0

Instances

Instances details

(MonadTransControl t, Forall (Identical t)) => MonadTransUnlift t Source #
Instance details Defined in Control.Monad.Trans.Unlift

newtype Unlift t Source #

A function which can move an action down the monad transformer stack, by providing any necessary environment to the action.

Note that, if ImpredicativeTypes worked reliably, this type wouldn't be necessary, and askUnlift would simply include a more generalized type.

Since 0.1.0

Constructors

Unlift
Fields unlift :: forall a n. Monad n => t n a -> n a

askUnlift :: forall t m. (MonadTransUnlift t, Monad m) => t m (Unlift t) Source #

Get the Unlift action for the current transformer layer.

Since 0.1.0

askRun :: (MonadTransUnlift t, Monad (t m), Monad m) => t m (t m a -> m a) Source #

A simplified version of askUnlift which addresses the common case where polymorphism isn't necessary.

Since 0.1.0

Base

class (MonadBaseControl b m, Forall (IdenticalBase m)) => MonadBaseUnlift b m | m -> b Source #

A monad transformer stack which can be unlifted, obeying the monad morphism laws.

Since 0.1.0

Instances

Instances details

(MonadBaseControl b m, Forall (IdenticalBase m)) => MonadBaseUnlift b m Source #
Instance details Defined in Control.Monad.Trans.Unlift

newtype UnliftBase b m Source #

Similar to Unlift, but instead of moving one layer down the stack, moves the action to the base monad.

Since 0.1.0

Constructors

UnliftBase
Fields unliftBase :: forall a. m a -> b a

askUnliftBase :: forall b m. MonadBaseUnlift b m => m (UnliftBase b m) Source #

Get the UnliftBase action for the current transformer stack.

Since 0.1.0

askRunBase :: MonadBaseUnlift b m => m (m a -> b a) Source #

A simplified version of askUnliftBase which addresses the common case where polymorphism isn't necessary.

Since 0.1.0

Reexports

class MonadTrans (t :: (Type -> Type) -> Type -> Type) where #

Methods

lift :: Monad m => m a -> t m a #

Instances

Instances details

MonadTrans ListT
Instance details Defined in Control.Monad.Trans.List Methods lift :: Monad m => m a -> ListT m a #
MonadTrans MaybeT
Instance details Defined in Control.Monad.Trans.Maybe Methods lift :: Monad m => m a -> MaybeT m a #
Monoid w => MonadTrans (WriterT w)
Instance details Defined in Control.Monad.Trans.Writer.Lazy Methods lift :: Monad m => m a -> WriterT w m a #
MonadTrans (StateT s)
Instance details Defined in Control.Monad.Trans.State.Lazy Methods lift :: Monad m => m a -> StateT s m a #
MonadTrans (ReaderT r)
Instance details Defined in Control.Monad.Trans.Reader Methods lift :: Monad m => m a -> ReaderT r m a #
MonadTrans (ExceptT e)
Instance details Defined in Control.Monad.Trans.Except Methods lift :: Monad m => m a -> ExceptT e m a #
MonadTrans (ErrorT e)
Instance details Defined in Control.Monad.Trans.Error Methods lift :: Monad m => m a -> ErrorT e m a #
MonadTrans (IdentityT :: (Type -> Type) -> Type -> Type)
Instance details Defined in Control.Monad.Trans.Identity Methods lift :: Monad m => m a -> IdentityT m a #
Monoid w => MonadTrans (AccumT w)
Instance details Defined in Control.Monad.Trans.Accum Methods lift :: Monad m => m a -> AccumT w m a #
MonadTrans (SelectT r)
Instance details Defined in Control.Monad.Trans.Select Methods lift :: Monad m => m a -> SelectT r m a #
MonadTrans (StateT s)
Instance details Defined in Control.Monad.Trans.State.Strict Methods lift :: Monad m => m a -> StateT s m a #
Monoid w => MonadTrans (WriterT w)
Instance details Defined in Control.Monad.Trans.Writer.Strict Methods lift :: Monad m => m a -> WriterT w m a #
MonadTrans (ContT r)
Instance details Defined in Control.Monad.Trans.Cont Methods lift :: Monad m => m a -> ContT r m a #
Monoid w => MonadTrans (RWST r w s)
Instance details Defined in Control.Monad.Trans.RWS.Lazy Methods lift :: Monad m => m a -> RWST r w s m a #
Monoid w => MonadTrans (RWST r w s)
Instance details Defined in Control.Monad.Trans.RWS.Strict Methods lift :: Monad m => m a -> RWST r w s m a #

class (Applicative b, Applicative m, Monad b, Monad m) => MonadBase (b :: Type -> Type) (m :: Type -> Type) | m -> b where Source #

Methods

liftBase :: b α -> m α Source #

Lift a computation from the base monad

Instances

Instances details

MonadBase [] []
Instance details Defined in Control.Monad.Base Methods liftBase :: [α] -> [α] Source #
MonadBase Maybe Maybe
Instance details Defined in Control.Monad.Base Methods liftBase :: Maybe α -> Maybe α Source #
MonadBase IO IO
Instance details Defined in Control.Monad.Base Methods liftBase :: IO α -> IO α Source #
MonadBase STM STM
Instance details Defined in Control.Monad.Base Methods liftBase :: STM α -> STM α Source #
MonadBase Identity Identity
Instance details Defined in Control.Monad.Base Methods liftBase :: Identity α -> Identity α Source #
MonadBase b m => MonadBase b (MaybeT m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> MaybeT m α Source #
MonadBase b m => MonadBase b (ListT m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> ListT m α Source #
(Monoid w, MonadBase b m) => MonadBase b (WriterT w m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> WriterT w m α Source #
(Monoid w, MonadBase b m) => MonadBase b (WriterT w m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> WriterT w m α Source #
MonadBase b m => MonadBase b (StateT s m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> StateT s m α Source #
MonadBase b m => MonadBase b (StateT s m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> StateT s m α Source #
MonadBase b m => MonadBase b (SelectT r m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> SelectT r m α Source #
MonadBase b m => MonadBase b (ReaderT r m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> ReaderT r m α Source #
MonadBase b m => MonadBase b (IdentityT m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> IdentityT m α Source #
MonadBase b m => MonadBase b (ExceptT e m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> ExceptT e m α Source #
(Error e, MonadBase b m) => MonadBase b (ErrorT e m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> ErrorT e m α Source #
(Monoid w, MonadBase b m) => MonadBase b (AccumT w m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> AccumT w m α Source #
MonadBase b m => MonadBase b (ContT r m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> ContT r m α Source #
(Monoid w, MonadBase b m) => MonadBase b (RWST r w s m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> RWST r w s m α Source #
(Monoid w, MonadBase b m) => MonadBase b (RWST r w s m)
Instance details Defined in Control.Monad.Base Methods liftBase :: b α -> RWST r w s m α Source #
MonadBase (Either e) (Either e)
Instance details Defined in Control.Monad.Base Methods liftBase :: Either e α -> Either e α Source #
MonadBase (ST s) (ST s)
Instance details Defined in Control.Monad.Base Methods liftBase :: ST s α -> ST s α Source #
MonadBase (ST s) (ST s)
Instance details Defined in Control.Monad.Base Methods liftBase :: ST s α -> ST s α Source #
MonadBase ((->) r :: Type -> Type) ((->) r :: Type -> Type)
Instance details Defined in Control.Monad.Base Methods liftBase :: (r -> α) -> r -> α Source #

class MonadTrans t => MonadTransControl (t :: (Type -> Type) -> Type -> Type) where Source #

The MonadTransControl type class is a stronger version of MonadTrans:

Instances of MonadTrans know how to lift actions in the base monad to the transformed monad. These lifted actions, however, are completely unaware of the monadic state added by the transformer.

MonadTransControl instances are aware of the monadic state of the transformer and allow to save and restore this state.

This allows to lift functions that have a monad transformer in both positive and negative position. Take, for example, the function

withFile :: FilePath -> IOMode -> (Handle -> IO r) -> IO r

MonadTrans instances can only lift the return type of the withFile function:

withFileLifted :: MonadTrans t => FilePath -> IOMode -> (Handle -> IO r) -> t IO r
withFileLifted file mode action = lift (withFile file mode action)

However, MonadTrans is not powerful enough to make withFileLifted accept a function that returns t IO. The reason is that we need to take away the transformer layer in order to pass the function to withFile. MonadTransControl allows us to do this:

withFileLifted' :: (Monad (t IO), MonadTransControl t) => FilePath -> IOMode -> (Handle -> t IO r) -> t IO r
withFileLifted' file mode action = liftWith (\run -> withFile file mode (run . action)) >>= restoreT . return

Associated Types

type StT (t :: (Type -> Type) -> Type -> Type) a Source #

Monadic state of t.

The monadic state of a monad transformer is the result type of its run function, e.g.:

runReaderT :: ReaderT r m a -> r -> m a
StT (ReaderT r) a ~ a

runStateT :: StateT s m a -> s -> m (a, s)
StT (StateT s) a ~ (a, s)

runMaybeT :: MaybeT m a -> m (Maybe a)
StT MaybeT a ~ Maybe a

Provided type instances:

StT IdentityT    a ~ a
StT MaybeT       a ~ Maybe a
StT (ErrorT e)   a ~ Error e => Either e a
StT (ExceptT e)  a ~ Either e a
StT ListT        a ~ [a]
StT (ReaderT r)  a ~ a
StT (StateT s)   a ~ (a, s)
StT (WriterT w)  a ~ Monoid w => (a, w)
StT (RWST r w s) a ~ Monoid w => (a, s, w)

Methods

liftWith :: Monad m => (Run t -> m a) -> t m a Source #

liftWith is similar to lift in that it lifts a computation from the argument monad to the constructed monad.

Instances should satisfy similar laws as the MonadTrans laws:

liftWith . const . return = return

liftWith (const (m >>= f)) = liftWith (const m) >>= liftWith . const . f

The difference with lift is that before lifting the m computation liftWith captures the state of t. It then provides the m computation with a Run function that allows running t n computations in n (for all n) on the captured state, e.g.

withFileLifted :: (Monad (t IO), MonadTransControl t) => FilePath -> IOMode -> (Handle -> t IO r) -> t IO r
withFileLifted file mode action = liftWith (\run -> withFile file mode (run . action)) >>= restoreT . return

If the Run function is ignored, liftWith coincides with lift:

lift f = liftWith (const f)

Implementations use the Run function associated with a transformer:

liftWith :: Monad m => ((Monad n => ReaderT r n b -> n b) -> m a) -> ReaderT r m a
liftWith f = ReaderT (r -> f (action -> runReaderT action r))

liftWith :: Monad m => ((Monad n => StateT s n b -> n (b, s)) -> m a) -> StateT s m a
liftWith f = StateT (s -> liftM (x -> (x, s)) (f (action -> runStateT action s)))

liftWith :: Monad m => ((Monad n => MaybeT n b -> n (Maybe b)) -> m a) -> MaybeT m a
liftWith f = MaybeT (liftM Just (f runMaybeT))

restoreT :: Monad m => m (StT t a) -> t m a Source #

Construct a t computation from the monadic state of t that is returned from a Run function.

Instances should satisfy:

liftWith (\run -> run t) >>= restoreT . return = t

restoreT is usually implemented through the constructor of the monad transformer:

ReaderT  :: (r -> m a) -> ReaderT r m a
restoreT ::       m a  -> ReaderT r m a
restoreT action = ReaderT { runReaderT = const action }

StateT   :: (s -> m (a, s)) -> StateT s m a
restoreT ::       m (a, s)  -> StateT s m a
restoreT action = StateT { runStateT = const action }

MaybeT   :: m (Maybe a) -> MaybeT m a
restoreT :: m (Maybe a) -> MaybeT m a
restoreT action = MaybeT action

Example type signatures:

restoreT :: Monad m             => m a            -> IdentityT m a
restoreT :: Monad m             => m (Maybe a)    -> MaybeT m a
restoreT :: (Monad m, Error e)  => m (Either e a) -> ErrorT e m a
restoreT :: Monad m             => m (Either e a) -> ExceptT e m a
restoreT :: Monad m             => m [a]          -> ListT m a
restoreT :: Monad m             => m a            -> ReaderT r m a
restoreT :: Monad m             => m (a, s)       -> StateT s m a
restoreT :: (Monad m, Monoid w) => m (a, w)       -> WriterT w m a
restoreT :: (Monad m, Monoid w) => m (a, s, w)    -> RWST r w s m a

Instances

Instances details

MonadTransControl ListT
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT ListT a Source # Methods liftWith :: Monad m => (Run ListT -> m a) -> ListT m a Source # restoreT :: Monad m => m (StT ListT a) -> ListT m a Source #
MonadTransControl MaybeT
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT MaybeT a Source # Methods liftWith :: Monad m => (Run MaybeT -> m a) -> MaybeT m a Source # restoreT :: Monad m => m (StT MaybeT a) -> MaybeT m a Source #
Monoid w => MonadTransControl (WriterT w)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (WriterT w) a Source # Methods liftWith :: Monad m => (Run (WriterT w) -> m a) -> WriterT w m a Source # restoreT :: Monad m => m (StT (WriterT w) a) -> WriterT w m a Source #
MonadTransControl (StateT s)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (StateT s) a Source # Methods liftWith :: Monad m => (Run (StateT s) -> m a) -> StateT s m a Source # restoreT :: Monad m => m (StT (StateT s) a) -> StateT s m a Source #
MonadTransControl (ReaderT r)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (ReaderT r) a Source # Methods liftWith :: Monad m => (Run (ReaderT r) -> m a) -> ReaderT r m a Source # restoreT :: Monad m => m (StT (ReaderT r) a) -> ReaderT r m a Source #
MonadTransControl (ExceptT e)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (ExceptT e) a Source # Methods liftWith :: Monad m => (Run (ExceptT e) -> m a) -> ExceptT e m a Source # restoreT :: Monad m => m (StT (ExceptT e) a) -> ExceptT e m a Source #
Error e => MonadTransControl (ErrorT e)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (ErrorT e) a Source # Methods liftWith :: Monad m => (Run (ErrorT e) -> m a) -> ErrorT e m a Source # restoreT :: Monad m => m (StT (ErrorT e) a) -> ErrorT e m a Source #
MonadTransControl (IdentityT :: (Type -> Type) -> Type -> Type)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT IdentityT a Source # Methods liftWith :: Monad m => (Run IdentityT -> m a) -> IdentityT m a Source # restoreT :: Monad m => m (StT IdentityT a) -> IdentityT m a Source #
MonadTransControl (StateT s)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (StateT s) a Source # Methods liftWith :: Monad m => (Run (StateT s) -> m a) -> StateT s m a Source # restoreT :: Monad m => m (StT (StateT s) a) -> StateT s m a Source #
Monoid w => MonadTransControl (WriterT w)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (WriterT w) a Source # Methods liftWith :: Monad m => (Run (WriterT w) -> m a) -> WriterT w m a Source # restoreT :: Monad m => m (StT (WriterT w) a) -> WriterT w m a Source #
Monoid w => MonadTransControl (RWST r w s)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (RWST r w s) a Source # Methods liftWith :: Monad m => (Run (RWST r w s) -> m a) -> RWST r w s m a Source # restoreT :: Monad m => m (StT (RWST r w s) a) -> RWST r w s m a Source #
Monoid w => MonadTransControl (RWST r w s)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StT (RWST r w s) a Source # Methods liftWith :: Monad m => (Run (RWST r w s) -> m a) -> RWST r w s m a Source # restoreT :: Monad m => m (StT (RWST r w s) a) -> RWST r w s m a Source #

class MonadBase b m => MonadBaseControl (b :: Type -> Type) (m :: Type -> Type) | m -> b where Source #

Writing instances

The usual way to write a MonadBaseControl instance for a transformer stack over a base monad B is to write an instance MonadBaseControl B B for the base monad, and MonadTransControl T instances for every transformer T. Instances for MonadBaseControl are then simply implemented using ComposeSt, defaultLiftBaseWith, defaultRestoreM.

Associated Types

type StM (m :: Type -> Type) a Source #

Monadic state that m adds to the base monad b.

For all base (non-transformed) monads, StM m a ~ a:

StM IO         a ~ a
StM Maybe      a ~ a
StM (Either e) a ~ a
StM []         a ~ a
StM ((->) r)   a ~ a
StM Identity   a ~ a
StM STM        a ~ a
StM (ST s)     a ~ a

If m is a transformed monad, m ~ t b, StM is the monadic state of the transformer t (given by its StT from MonadTransControl). For a transformer stack, StM is defined recursively:

StM (IdentityT  m) a ~ ComposeSt IdentityT m a ~ StM m a
StM (MaybeT     m) a ~ ComposeSt MaybeT    m a ~ StM m (Maybe a)
StM (ErrorT e   m) a ~ ComposeSt ErrorT    m a ~ Error e => StM m (Either e a)
StM (ExceptT e  m) a ~ ComposeSt ExceptT   m a ~ StM m (Either e a)
StM (ListT      m) a ~ ComposeSt ListT     m a ~ StM m [a]
StM (ReaderT r  m) a ~ ComposeSt ReaderT   m a ~ StM m a
StM (StateT s   m) a ~ ComposeSt StateT    m a ~ StM m (a, s)
StM (WriterT w  m) a ~ ComposeSt WriterT   m a ~ Monoid w => StM m (a, w)
StM (RWST r w s m) a ~ ComposeSt RWST      m a ~ Monoid w => StM m (a, s, w)

Methods

liftBaseWith :: (RunInBase m b -> b a) -> m a Source #

liftBaseWith is similar to liftIO and liftBase in that it lifts a base computation to the constructed monad.

Instances should satisfy similar laws as the MonadIO and MonadBase laws:

liftBaseWith . const . return = return

liftBaseWith (const (m >>= f)) = liftBaseWith (const m) >>= liftBaseWith . const . f

The difference with liftBase is that before lifting the base computation liftBaseWith captures the state of m. It then provides the base computation with a RunInBase function that allows running m computations in the base monad on the captured state:

withFileLifted :: MonadBaseControl IO m => FilePath -> IOMode -> (Handle -> m a) -> m a
withFileLifted file mode action = liftBaseWith (\runInBase -> withFile file mode (runInBase . action)) >>= restoreM
                             -- = control $ \runInBase -> withFile file mode (runInBase . action)
                             -- = liftBaseOp (withFile file mode) action

liftBaseWith is usually not implemented directly, but using defaultLiftBaseWith.

restoreM :: StM m a -> m a Source #

Construct a m computation from the monadic state of m that is returned from a RunInBase function.

Instances should satisfy:

liftBaseWith (\runInBase -> runInBase m) >>= restoreM = m

restoreM is usually not implemented directly, but using defaultRestoreM.

Instances

Instances details

MonadBaseControl [] []
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM [] a Source # Methods liftBaseWith :: (RunInBase [] [] -> [a]) -> [a] Source # restoreM :: StM [] a -> [a] Source #
MonadBaseControl Maybe Maybe
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM Maybe a Source # Methods liftBaseWith :: (RunInBase Maybe Maybe -> Maybe a) -> Maybe a Source # restoreM :: StM Maybe a -> Maybe a Source #
MonadBaseControl IO IO
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM IO a Source # Methods liftBaseWith :: (RunInBase IO IO -> IO a) -> IO a Source # restoreM :: StM IO a -> IO a Source #
MonadBaseControl STM STM
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM STM a Source # Methods liftBaseWith :: (RunInBase STM STM -> STM a) -> STM a Source # restoreM :: StM STM a -> STM a Source #
MonadBaseControl Identity Identity
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM Identity a Source # Methods liftBaseWith :: (RunInBase Identity Identity -> Identity a) -> Identity a Source # restoreM :: StM Identity a -> Identity a Source #
MonadBaseControl b m => MonadBaseControl b (MaybeT m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (MaybeT m) a Source # Methods liftBaseWith :: (RunInBase (MaybeT m) b -> b a) -> MaybeT m a Source # restoreM :: StM (MaybeT m) a -> MaybeT m a Source #
MonadBaseControl b m => MonadBaseControl b (ListT m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (ListT m) a Source # Methods liftBaseWith :: (RunInBase (ListT m) b -> b a) -> ListT m a Source # restoreM :: StM (ListT m) a -> ListT m a Source #
(Monoid w, MonadBaseControl b m) => MonadBaseControl b (WriterT w m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (WriterT w m) a Source # Methods liftBaseWith :: (RunInBase (WriterT w m) b -> b a) -> WriterT w m a Source # restoreM :: StM (WriterT w m) a -> WriterT w m a Source #
(Monoid w, MonadBaseControl b m) => MonadBaseControl b (WriterT w m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (WriterT w m) a Source # Methods liftBaseWith :: (RunInBase (WriterT w m) b -> b a) -> WriterT w m a Source # restoreM :: StM (WriterT w m) a -> WriterT w m a Source #
MonadBaseControl b m => MonadBaseControl b (StateT s m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (StateT s m) a Source # Methods liftBaseWith :: (RunInBase (StateT s m) b -> b a) -> StateT s m a Source # restoreM :: StM (StateT s m) a -> StateT s m a Source #
MonadBaseControl b m => MonadBaseControl b (StateT s m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (StateT s m) a Source # Methods liftBaseWith :: (RunInBase (StateT s m) b -> b a) -> StateT s m a Source # restoreM :: StM (StateT s m) a -> StateT s m a Source #
MonadBaseControl b m => MonadBaseControl b (ReaderT r m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (ReaderT r m) a Source # Methods liftBaseWith :: (RunInBase (ReaderT r m) b -> b a) -> ReaderT r m a Source # restoreM :: StM (ReaderT r m) a -> ReaderT r m a Source #
MonadBaseControl b m => MonadBaseControl b (IdentityT m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (IdentityT m) a Source # Methods liftBaseWith :: (RunInBase (IdentityT m) b -> b a) -> IdentityT m a Source # restoreM :: StM (IdentityT m) a -> IdentityT m a Source #
MonadBaseControl b m => MonadBaseControl b (ExceptT e m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (ExceptT e m) a Source # Methods liftBaseWith :: (RunInBase (ExceptT e m) b -> b a) -> ExceptT e m a Source # restoreM :: StM (ExceptT e m) a -> ExceptT e m a Source #
(Error e, MonadBaseControl b m) => MonadBaseControl b (ErrorT e m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (ErrorT e m) a Source # Methods liftBaseWith :: (RunInBase (ErrorT e m) b -> b a) -> ErrorT e m a Source # restoreM :: StM (ErrorT e m) a -> ErrorT e m a Source #
(Monoid w, MonadBaseControl b m) => MonadBaseControl b (RWST r w s m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (RWST r w s m) a Source # Methods liftBaseWith :: (RunInBase (RWST r w s m) b -> b a) -> RWST r w s m a Source # restoreM :: StM (RWST r w s m) a -> RWST r w s m a Source #
(Monoid w, MonadBaseControl b m) => MonadBaseControl b (RWST r w s m)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (RWST r w s m) a Source # Methods liftBaseWith :: (RunInBase (RWST r w s m) b -> b a) -> RWST r w s m a Source # restoreM :: StM (RWST r w s m) a -> RWST r w s m a Source #
MonadBaseControl (Either e) (Either e)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (Either e) a Source # Methods liftBaseWith :: (RunInBase (Either e) (Either e) -> Either e a) -> Either e a Source # restoreM :: StM (Either e) a -> Either e a Source #
MonadBaseControl (ST s) (ST s)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (ST s) a Source # Methods liftBaseWith :: (RunInBase (ST s) (ST s) -> ST s a) -> ST s a Source # restoreM :: StM (ST s) a -> ST s a Source #
MonadBaseControl (ST s) (ST s)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (ST s) a Source # Methods liftBaseWith :: (RunInBase (ST s) (ST s) -> ST s a) -> ST s a Source # restoreM :: StM (ST s) a -> ST s a Source #
MonadBaseControl ((->) r :: Type -> Type) ((->) r :: Type -> Type)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM ((->) r) a Source # Methods liftBaseWith :: (RunInBase ((->) r) ((->) r) -> r -> a) -> r -> a Source # restoreM :: StM ((->) r) a -> r -> a Source #