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

Description

Mutable references in the (strict) 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)

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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