Safe Haskell	None
Language	Haskell2010

IOEnv

Synopsis

data IOEnv env a
module MonadUtils
failM :: IOEnv env a
failWithM :: String -> IOEnv env a
data IOEnvFailure = IOEnvFailure
getEnv :: IOEnv env env
setEnv :: env' -> IOEnv env' a -> IOEnv env a
updEnv :: (env -> env') -> IOEnv env' a -> IOEnv env a
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 :: * -> *
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 ()
atomicUpdMutVar :: IORef a -> (a -> (a, b)) -> IOEnv env b
atomicUpdMutVar' :: IORef a -> (a -> (a, b)) -> IOEnv env b

Documentation

data IOEnv env a Source #

Instances

Monad (IOEnv m) #
Instance details Methods (>>=) :: IOEnv m a -> (a -> IOEnv m b) -> IOEnv m b Source # (>>) :: IOEnv m a -> IOEnv m b -> IOEnv m b Source # return :: a -> IOEnv m a Source # fail :: String -> IOEnv m a Source #
Functor (IOEnv m) #
Instance details Methods fmap :: (a -> b) -> IOEnv m a -> IOEnv m b Source # (<$) :: a -> IOEnv m b -> IOEnv m a Source #
MonadFail (IOEnv m) #
Instance details Methods fail :: String -> IOEnv m a Source #
Applicative (IOEnv m) #
Instance details Methods pure :: a -> IOEnv m a Source # (<>) :: IOEnv m (a -> b) -> IOEnv m a -> IOEnv m b Source # liftA2 :: (a -> b -> c) -> IOEnv m a -> IOEnv m b -> IOEnv m c Source # (>) :: IOEnv m a -> IOEnv m b -> IOEnv m b Source # (<*) :: IOEnv m a -> IOEnv m b -> IOEnv m a Source #
MonadIO (IOEnv env) #
Instance details Methods liftIO :: IO a -> IOEnv env a Source #
Alternative (IOEnv env) #
Instance details Methods empty :: IOEnv env a Source # (<\|>) :: IOEnv env a -> IOEnv env a -> IOEnv env a Source # some :: IOEnv env a -> IOEnv env [a] Source # many :: IOEnv env a -> IOEnv env [a] Source #
MonadPlus (IOEnv env) #
Instance details Methods mzero :: IOEnv env a Source # mplus :: IOEnv env a -> IOEnv env a -> IOEnv env a Source #
ExceptionMonad (IOEnv a) #
Instance details Methods gcatch :: Exception e => IOEnv a a0 -> (e -> IOEnv a a0) -> IOEnv a a0 Source # gmask :: ((IOEnv a a0 -> IOEnv a a0) -> IOEnv a b) -> IOEnv a b Source # gbracket :: IOEnv a a0 -> (a0 -> IOEnv a b) -> (a0 -> IOEnv a c) -> IOEnv a c Source # gfinally :: IOEnv a a0 -> IOEnv a b -> IOEnv a a0 Source #
ContainsModule env => HasModule (IOEnv env) #
Instance details Methods getModule :: IOEnv env Module Source #
ContainsDynFlags env => HasDynFlags (IOEnv env) #
Instance details Methods getDynFlags :: IOEnv env DynFlags Source #

module MonadUtils

failM :: IOEnv env a Source #

failWithM :: String -> IOEnv env a Source #

data IOEnvFailure Source #

Constructors

IOEnvFailure

Instances

Show IOEnvFailure #
Instance details Methods showsPrec :: Int -> IOEnvFailure -> ShowS Source # show :: IOEnvFailure -> String Source # showList :: [IOEnvFailure] -> ShowS Source #
Exception IOEnvFailure #
Instance details Methods toException :: IOEnvFailure -> SomeException Source # fromException :: SomeException -> Maybe IOEnvFailure Source # displayException :: IOEnvFailure -> String Source #

getEnv :: IOEnv env env Source #

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

Perform a computation with a different environment

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

Perform a computation with an altered environment

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

unsafeInterleaveM :: IOEnv env a -> IOEnv env a Source #

uninterruptibleMaskM_ :: IOEnv env a -> IOEnv env a Source #

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

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

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

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

data IORef a :: * -> * Source #

A mutable variable in the IO monad

Instances

NFData1 IORef	Since: 1.4.3.0
Instance details Methods liftRnf :: (a -> ()) -> IORef a -> () Source #
Eq (IORef a)	Pointer equality. Since: 4.1.0.0
Instance details Methods (==) :: IORef a -> IORef a -> Bool # (/=) :: IORef a -> IORef a -> Bool #
NFData (IORef a)	NOTE: Only strict in the reference and not the referenced value. Since: 1.4.2.0
Instance details Methods rnf :: IORef a -> () Source #

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

readMutVar :: IORef a -> IOEnv env a Source #

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

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

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

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 Source #

Strict variant of atomicUpdMutVar.