module GHC.STRef (
STRef(..),
newSTRef, readSTRef, writeSTRef
) where
import GHC.ST
import GHC.Base
data STRef s a = STRef (MutVar# s a)
newSTRef :: a -> ST s (STRef s a)
newSTRef init = ST $ \s1# ->
case newMutVar# init s1# of { (# s2#, var# #) ->
(# s2#, STRef var# #) }
readSTRef :: STRef s a -> ST s a
readSTRef (STRef var#) = ST $ \s1# -> readMutVar# var# s1#
writeSTRef :: STRef s a -> a -> ST s ()
writeSTRef (STRef var#) val = ST $ \s1# ->
case writeMutVar# var# val s1# of { s2# ->
(# s2#, () #) }
instance Eq (STRef s a) where
STRef v1# == STRef v2# = sameMutVar# v1# v2#
\end{code}
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4