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> Haskell Core Libraries (base package) Parent Contents Index Data.IORef Portability portable Stability experimental Maintainer libraries@haskell.org Description Mutable references in the IO monad. Synopsis data IORef a newIORef :: a -> IO (IORef a) readIORef :: IORef a -> IO a writeIORef :: IORef a -> a -> IO () modifyIORef :: IORef a -> (a -> a) -> IO () mkWeakIORef :: IORef a -> IO () -> IO (Weak (IORef a)) IORefs data IORef a A mutable variable in the IO monad Instances (Typeable a) => Typeable (IORef a) newIORef :: a -> IO (IORef a) Build a new IORef readIORef :: IORef a -> IO a Read the value of an IORef writeIORef :: IORef a -> a -> IO () Write a new value into an IORef modifyIORef :: IORef a -> (a -> a) -> IO () Mutate the contents of an IORef mkWeakIORef :: IORef a -> IO () -> IO (Weak (IORef a)) Make a Weak pointer to an IORef Produced by Haddock version 0.4