GHC.Data.IOEnv

The IO Monad with an environment

The environment is passed around as a Reader monad but as its in the IO monad, mutable references can be used for updating state.

Documentation

data IOEnv env a

Instances

MonadFail (IOEnv m)

Defined in GHC.Data.IOEnv

Methods

fail :: String -> IOEnv m a

MonadFix (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

mfix :: (a -> IOEnv env a) -> IOEnv env a

MonadIO (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

liftIO :: IO a -> IOEnv env a

Alternative (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

empty :: IOEnv env a

(<|>) :: IOEnv env a -> IOEnv env a -> IOEnv env a

some :: IOEnv env a -> IOEnv env [a]

many :: IOEnv env a -> IOEnv env [a]

Applicative (IOEnv m)

Defined in GHC.Data.IOEnv

Methods

pure :: a -> IOEnv m a

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

liftA2 :: (a -> b -> c) -> IOEnv m a -> IOEnv m b -> IOEnv m c

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

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

Functor (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

fmap :: (a -> b) -> IOEnv env a -> IOEnv env b

(<$) :: a -> IOEnv env b -> IOEnv env a

Monad (IOEnv m)

Defined in GHC.Data.IOEnv

Methods

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

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

return :: a -> IOEnv m a

MonadPlus (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

mzero :: IOEnv env a

mplus :: IOEnv env a -> IOEnv env a -> IOEnv env a

MonadCatch (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

catch :: Exception e => IOEnv env a -> (e -> IOEnv env a) -> IOEnv env a

MonadMask (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

mask :: ((forall a. IOEnv env a -> IOEnv env a) -> IOEnv env b) -> IOEnv env b

uninterruptibleMask :: ((forall a. IOEnv env a -> IOEnv env a) -> IOEnv env b) -> IOEnv env b

generalBracket :: IOEnv env a -> (a -> ExitCase b -> IOEnv env c) -> (a -> IOEnv env b) -> IOEnv env (b, c)

MonadThrow (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

throwM :: Exception e => e -> IOEnv env a

ContainsHooks env => HasHooks (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

getHooks :: IOEnv env Hooks

ContainsDynFlags env => HasDynFlags (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

getDynFlags :: IOEnv env DynFlags

ContainsModule env => HasModule (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

getModule :: IOEnv env Module

ContainsLogger env => HasLogger (IOEnv env)

Defined in GHC.Data.IOEnv

Methods

getLogger :: IOEnv env Logger

module GHC.Utils.Monad

failM :: IOEnv env a

failWithM :: String -> IOEnv env a

data IOEnvFailure

Constructors

IOEnvFailure

Instances

Exception IOEnvFailure

Defined in GHC.Data.IOEnv

Methods

toException :: IOEnvFailure -> SomeException

fromException :: SomeException -> Maybe IOEnvFailure

displayException :: IOEnvFailure -> String

Show IOEnvFailure

Defined in GHC.Data.IOEnv

Methods

showsPrec :: Int -> IOEnvFailure -> ShowS

show :: IOEnvFailure -> String

showList :: [IOEnvFailure] -> ShowS

getEnv :: IOEnv env env

setEnv :: env' -> IOEnv env' a -> IOEnv env a

Perform a computation with a different environment

updEnv :: (env -> env') -> IOEnv env' a -> IOEnv env a

Perform a computation with an altered environment

runIOEnv :: env -> IOEnv env a -> IO a

unsafeInterleaveM :: IOEnv env a -> IOEnv env a

uninterruptibleMaskM_ :: IOEnv env a -> IOEnv env a

tryM :: IOEnv env r -> IOEnv env (Either IOEnvFailure r)

tryAllM :: IOEnv env r -> IOEnv env (Either SomeException r)

tryMostM :: IOEnv env r -> IOEnv env (Either SomeException r)

fixM :: (a -> IOEnv env a) -> IOEnv env a

data IORef a

A mutable variable in the IO monad

Instances

NFData1 IORef

Since: deepseq-1.4.3.0

Defined in Control.DeepSeq

Methods

liftRnf :: (a -> ()) -> IORef a -> ()

NFData (IORef a)

NOTE: Only strict in the reference and not the referenced value.

Since: deepseq-1.4.2.0

Defined in Control.DeepSeq

Methods

rnf :: IORef a -> ()

Eq (IORef a)

Pointer equality.

Since: base-4.0.0.0

Defined in GHC.IORef

Methods

(==) :: IORef a -> IORef a -> Bool

(/=) :: IORef a -> IORef a -> Bool

newMutVar :: a -> IOEnv env (IORef a)

readMutVar :: IORef a -> IOEnv env a

writeMutVar :: IORef a -> a -> IOEnv env ()

updMutVar :: IORef a -> (a -> a) -> IOEnv env ()

updMutVarM :: IORef a -> (a -> IOEnv env a) -> IOEnv env ()

atomicUpdMutVar :: IORef a -> (a -> (a, b)) -> IOEnv env b

Atomically update the reference. Does not force the evaluation of the new variable contents. For strict update, use atomicUpdMutVar'.

atomicUpdMutVar' :: IORef a -> (a -> (a, b)) -> IOEnv env b

Strict variant of atomicUpdMutVar.