base-4.2.0.1: Basic librariesSource codeContentsIndex
Data.STRef
Portabilitynon-portable (uses Control.Monad.ST)
Stabilityexperimental
Maintainerlibraries@haskell.org
Contents
STRefs
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 Source
a value of type STRef s a is a mutable variable in state thread s, containing a value of type a
show/hide Instances
newSTRef :: a -> ST s (STRef s a)Source
Build a new STRef in the current state thread
readSTRef :: STRef s a -> ST s aSource
Read the value of an STRef
writeSTRef :: STRef s a -> a -> ST s ()Source
Write a new value into an STRef
modifySTRef :: STRef s a -> (a -> a) -> ST s ()Source
Mutate the contents of an STRef
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