a value of type STRef s a is a mutable variable in state thread s, containing a value of type a
Instances
Typeable2 STRef Eq (STRef s a)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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