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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

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