ghc-6.12.3: The GHC API Source code Contents Index

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 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) Functor (IOEnv m) MonadPlus IO => MonadPlus (IOEnv env) Applicative (IOEnv m) Quasi (IOEnv (Env TcGblEnv TcLclEnv)) MonadIO (IOEnv env) MonadUnique (IOEnv (Env gbl lcl)) MonadThings (IOEnv (Env TcGblEnv TcLclEnv)) MonadThings (IOEnv (Env DsGblEnv DsLclEnv))

module MonadUtils

failM :: IOEnv env a Source

failWithM :: String -> IOEnv env a Source

data IOEnvFailure Source

Constructors IOEnvFailure Instances Show IOEnvFailure Typeable IOEnvFailure Exception IOEnvFailure

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

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 Typeable1 IORef Eq (IORef a)

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.

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