ghc-7.10.2: The GHC API

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) |
Functor (IOEnv m) |
Applicative (IOEnv m) |
MonadPlus IO => Alternative (IOEnv env) |
MonadPlus IO => MonadPlus (IOEnv env) |
MonadIO (IOEnv env) |
ContainsModule env => HasModule (IOEnv env) |
ContainsDynFlags env => HasDynFlags (IOEnv env) |

module MonadUtils

failM :: IOEnv env a Source

failWithM :: String -> IOEnv env a Source

data IOEnvFailure Source

Constructors

IOEnvFailure |

Instances

Show 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

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

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`.