Copyright	Josef Svenningsson 2008-2010 (c) The University of Glasgow 1994-2000
License	BSD
Maintainer	josef.svenningsson@gmail.com, Andreas Abel
Stability	stable
Portability	non-portable (GHC Extensions)
Safe Haskell	Safe-Inferred
Language	Haskell2010

Control.Monad.ST.Trans.Internal

Description

This module provides the implementation of the STT type for those occasions where it is needed in order to implement new liftings through operations in other monads.

Warning! This monad transformer should not be used with monads that can contain multiple answers, like the list monad. The reason is that the will be duplicated across the different answers and this cause Bad Things to happen (such as loss of referential transparency). Safe monads include the monads State, Reader, Writer, Maybe and combinations of their corresponding monad transformers.

Synopsis

newtype STT s m a = STT (State# s -> m (STTRet s a))
unSTT :: STT s m a -> State# s -> m (STTRet s a)
data STTRet s a = STTRet (State# s) a
liftST :: Applicative m => ST s a -> STT s m a
liftSTT :: STT s m a -> State# s -> m (STTRet s a)

Documentation

newtype STT s m a Source #

STT is the monad transformer providing polymorphic updateable references

Constructors

STT (State# s -> m (STTRet s a))

Instances

Instances details

(MonadError e m, Functor m) => MonadError e (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods throwError :: e -> STT s m a # catchError :: STT s m a -> (e -> STT s m a) -> STT s m a #
(MonadReader r m, Functor m) => MonadReader r (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods ask :: STT s m r # local :: (r -> r) -> STT s m a -> STT s m a # reader :: (r -> a) -> STT s m a #
(MonadState s m, Functor m) => MonadState s (STT s1 m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods get :: STT s1 m s # put :: s -> STT s1 m () # state :: (s -> (a, s)) -> STT s1 m a #
(MonadWriter w m, Functor m) => MonadWriter w (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods writer :: (a, w) -> STT s m a # tell :: w -> STT s m () # listen :: STT s m a -> STT s m (a, w) # pass :: STT s m (a, w -> w) -> STT s m a #
MonadTrans (STT s) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods lift :: Monad m => m a -> STT s m a #
(Applicative m, Monad m) => MArray (STUArray s) Int16 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Int16 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Int16 -> STT s m Int newArray :: Ix i => (i, i) -> Int16 -> STT s m (STUArray s i Int16) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int16) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int16) unsafeRead :: Ix i => STUArray s i Int16 -> Int -> STT s m Int16 unsafeWrite :: Ix i => STUArray s i Int16 -> Int -> Int16 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Int32 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Int32 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Int32 -> STT s m Int newArray :: Ix i => (i, i) -> Int32 -> STT s m (STUArray s i Int32) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int32) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int32) unsafeRead :: Ix i => STUArray s i Int32 -> Int -> STT s m Int32 unsafeWrite :: Ix i => STUArray s i Int32 -> Int -> Int32 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Int64 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Int64 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Int64 -> STT s m Int newArray :: Ix i => (i, i) -> Int64 -> STT s m (STUArray s i Int64) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int64) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int64) unsafeRead :: Ix i => STUArray s i Int64 -> Int -> STT s m Int64 unsafeWrite :: Ix i => STUArray s i Int64 -> Int -> Int64 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Int8 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Int8 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Int8 -> STT s m Int newArray :: Ix i => (i, i) -> Int8 -> STT s m (STUArray s i Int8) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int8) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int8) unsafeRead :: Ix i => STUArray s i Int8 -> Int -> STT s m Int8 unsafeWrite :: Ix i => STUArray s i Int8 -> Int -> Int8 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Word16 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Word16 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Word16 -> STT s m Int newArray :: Ix i => (i, i) -> Word16 -> STT s m (STUArray s i Word16) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word16) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word16) unsafeRead :: Ix i => STUArray s i Word16 -> Int -> STT s m Word16 unsafeWrite :: Ix i => STUArray s i Word16 -> Int -> Word16 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Word32 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Word32 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Word32 -> STT s m Int newArray :: Ix i => (i, i) -> Word32 -> STT s m (STUArray s i Word32) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word32) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word32) unsafeRead :: Ix i => STUArray s i Word32 -> Int -> STT s m Word32 unsafeWrite :: Ix i => STUArray s i Word32 -> Int -> Word32 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Word64 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Word64 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Word64 -> STT s m Int newArray :: Ix i => (i, i) -> Word64 -> STT s m (STUArray s i Word64) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word64) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word64) unsafeRead :: Ix i => STUArray s i Word64 -> Int -> STT s m Word64 unsafeWrite :: Ix i => STUArray s i Word64 -> Int -> Word64 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Word8 (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Word8 -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Word8 -> STT s m Int newArray :: Ix i => (i, i) -> Word8 -> STT s m (STUArray s i Word8) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word8) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word8) unsafeRead :: Ix i => STUArray s i Word8 -> Int -> STT s m Word8 unsafeWrite :: Ix i => STUArray s i Word8 -> Int -> Word8 -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Bool (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Bool -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Bool -> STT s m Int newArray :: Ix i => (i, i) -> Bool -> STT s m (STUArray s i Bool) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Bool) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Bool) unsafeRead :: Ix i => STUArray s i Bool -> Int -> STT s m Bool unsafeWrite :: Ix i => STUArray s i Bool -> Int -> Bool -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Char (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Char -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Char -> STT s m Int newArray :: Ix i => (i, i) -> Char -> STT s m (STUArray s i Char) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Char) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Char) unsafeRead :: Ix i => STUArray s i Char -> Int -> STT s m Char unsafeWrite :: Ix i => STUArray s i Char -> Int -> Char -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Double (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Double -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Double -> STT s m Int newArray :: Ix i => (i, i) -> Double -> STT s m (STUArray s i Double) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Double) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Double) unsafeRead :: Ix i => STUArray s i Double -> Int -> STT s m Double unsafeWrite :: Ix i => STUArray s i Double -> Int -> Double -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Float (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Float -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Float -> STT s m Int newArray :: Ix i => (i, i) -> Float -> STT s m (STUArray s i Float) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Float) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Float) unsafeRead :: Ix i => STUArray s i Float -> Int -> STT s m Float unsafeWrite :: Ix i => STUArray s i Float -> Int -> Float -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Int (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Int -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Int -> STT s m Int newArray :: Ix i => (i, i) -> Int -> STT s m (STUArray s i Int) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Int) unsafeRead :: Ix i => STUArray s i Int -> Int -> STT s m Int unsafeWrite :: Ix i => STUArray s i Int -> Int -> Int -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) Word (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i Word -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i Word -> STT s m Int newArray :: Ix i => (i, i) -> Word -> STT s m (STUArray s i Word) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i Word) unsafeRead :: Ix i => STUArray s i Word -> Int -> STT s m Word unsafeWrite :: Ix i => STUArray s i Word -> Int -> Word -> STT s m ()
(Applicative m, Monad m) => MArray (STArray s) e (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STArray s i e -> STT s m (i, i) # getNumElements :: Ix i => STArray s i e -> STT s m Int newArray :: Ix i => (i, i) -> e -> STT s m (STArray s i e) # newArray_ :: Ix i => (i, i) -> STT s m (STArray s i e) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STArray s i e) unsafeRead :: Ix i => STArray s i e -> Int -> STT s m e unsafeWrite :: Ix i => STArray s i e -> Int -> e -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) (FunPtr a) (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i (FunPtr a) -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i (FunPtr a) -> STT s m Int newArray :: Ix i => (i, i) -> FunPtr a -> STT s m (STUArray s i (FunPtr a)) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i (FunPtr a)) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i (FunPtr a)) unsafeRead :: Ix i => STUArray s i (FunPtr a) -> Int -> STT s m (FunPtr a) unsafeWrite :: Ix i => STUArray s i (FunPtr a) -> Int -> FunPtr a -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) (Ptr a) (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i (Ptr a) -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i (Ptr a) -> STT s m Int newArray :: Ix i => (i, i) -> Ptr a -> STT s m (STUArray s i (Ptr a)) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i (Ptr a)) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i (Ptr a)) unsafeRead :: Ix i => STUArray s i (Ptr a) -> Int -> STT s m (Ptr a) unsafeWrite :: Ix i => STUArray s i (Ptr a) -> Int -> Ptr a -> STT s m ()
(Applicative m, Monad m) => MArray (STUArray s) (StablePtr a) (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods getBounds :: Ix i => STUArray s i (StablePtr a) -> STT s m (i, i) # getNumElements :: Ix i => STUArray s i (StablePtr a) -> STT s m Int newArray :: Ix i => (i, i) -> StablePtr a -> STT s m (STUArray s i (StablePtr a)) # newArray_ :: Ix i => (i, i) -> STT s m (STUArray s i (StablePtr a)) # unsafeNewArray_ :: Ix i => (i, i) -> STT s m (STUArray s i (StablePtr a)) unsafeRead :: Ix i => STUArray s i (StablePtr a) -> Int -> STT s m (StablePtr a) unsafeWrite :: Ix i => STUArray s i (StablePtr a) -> Int -> StablePtr a -> STT s m ()
(MonadFail m, Functor m) => MonadFail (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods fail :: String -> STT s m a #
(MonadFix m, Functor m) => MonadFix (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods mfix :: (a -> STT s m a) -> STT s m a #
(MonadIO m, Functor m) => MonadIO (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods liftIO :: IO a -> STT s m a #
(Monad m, Alternative m) => Alternative (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods empty :: STT s m a # (<\|>) :: STT s m a -> STT s m a -> STT s m a # some :: STT s m a -> STT s m [a] # many :: STT s m a -> STT s m [a] #
(Monad m, Functor m) => Applicative (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods pure :: a -> STT s m a # (<>) :: STT s m (a -> b) -> STT s m a -> STT s m b # liftA2 :: (a -> b -> c) -> STT s m a -> STT s m b -> STT s m c # (>) :: STT s m a -> STT s m b -> STT s m b # (<*) :: STT s m a -> STT s m b -> STT s m a #
Functor m => Functor (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods fmap :: (a -> b) -> STT s m a -> STT s m b # (<$) :: a -> STT s m b -> STT s m a #
(Monad m, Functor m) => Monad (STT s m) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods (>>=) :: STT s m a -> (a -> STT s m b) -> STT s m b # (>>) :: STT s m a -> STT s m b -> STT s m b # return :: a -> STT s m a #

unSTT :: STT s m a -> State# s -> m (STTRet s a) Source #

data STTRet s a Source #

STTRet is needed to encapsulate the unboxed state token that GHC passes around. This type is essentially a pair, but an ordinary pair is not not allowed to contain unboxed types.

Constructors

STTRet (State# s) a

Instances

Instances details

Functor (STTRet s) Source #
Instance details Defined in Control.Monad.ST.Trans.Internal Methods fmap :: (a -> b) -> STTRet s a -> STTRet s b # (<$) :: a -> STTRet s b -> STTRet s a #

liftST :: Applicative m => ST s a -> STT s m a Source #

Lifting the ST monad into STT. The library uses this function extensively to be able to reuse functions from ST.

liftSTT :: STT s m a -> State# s -> m (STTRet s a) Source #