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Data.STRef.Lazy Portability non-portable (requires non-portable module ST) Stability experimental Maintainer libraries@haskell.org

Description

Mutable references in the lazy ST monad.

Synopsis

data STRef 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 ()

STRefs

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 Instances (Typeable a, Typeable b) => Typeable (STRef a b) Eq (STRef 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 ()

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