Haskell Core Libraries (base package)ParentContentsIndex
GHC.STRef
Portability non-portable (GHC Extensions)
Stability internal
Maintainer cvs-ghc@haskell.org
Description
References in the ST monad.
Synopsis
data STRef s a = STRef (MutVar# s a)
newSTRef :: a -> ST s (STRef s a)
readSTRef :: STRef s a -> ST s a
writeSTRef :: STRef s a -> a -> ST s ()
modifySTRef :: STRef s a -> (a -> a) -> ST s ()
Documentation
data STRef s a
a value of type STRef s a is a mutable variable in state thread s, containing a value of type a
Constructors
STRef (MutVar# s a)
Instances
(Typeable a, Typeable b) => Typeable (STRef a b)
Eq (STRef s a)
newSTRef :: a -> ST s (STRef s a)
Build a new STRef in the current state thread
readSTRef :: STRef s a -> ST s a
Read the value of an STRef
writeSTRef :: STRef s a -> a -> ST s ()
Write a new value into an STRef
modifySTRef :: STRef s a -> (a -> a) -> ST s ()
Mutate the contents of an STRef
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