%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[UniqSupply]{The @UniqueSupply@ data type and a (monadic) supply thereof}
UniqSupply, -- Abstractly
- getUnique, getUniques, -- basic ops
+ uniqFromSupply, uniqsFromSupply, -- basic ops
UniqSM, -- type: unique supply monad
- initUs, thenUs, returnUs, fixUs,
+ initUs, thenUs, thenUs_, returnUs, fixUs, getUs, setUs,
+ getUniqueUs, getUniquesUs,
mapUs, mapAndUnzipUs, mapAndUnzip3Us,
thenMaybeUs, mapAccumLUs,
mkSplitUniqSupply :: Char -> IO UniqSupply
splitUniqSupply :: UniqSupply -> (UniqSupply, UniqSupply)
-getUnique :: UniqSupply -> Unique
-getUniques :: Int -> UniqSupply -> [Unique]
+uniqFromSupply :: UniqSupply -> Unique
+uniqsFromSupply :: Int -> UniqSupply -> [Unique]
\end{code}
\begin{code}
\end{code}
\begin{code}
-getUnique (MkSplitUniqSupply (I# n) _ _) = mkUniqueGrimily n
+uniqFromSupply (MkSplitUniqSupply (I# n) _ _) = mkUniqueGrimily n
-getUniques (I# i) supply = i `get_from` supply
+uniqsFromSupply (I# i) supply = i `get_from` supply
where
get_from 0# _ = []
get_from n (MkSplitUniqSupply (I# u) _ s2)
%************************************************************************
\begin{code}
-type UniqSM result = UniqSupply -> result
+type UniqSM result = UniqSupply -> (result, UniqSupply)
-- the initUs function also returns the final UniqSupply
initUs :: UniqSupply -> UniqSM a -> a
-initUs init_us m = m init_us
+initUs init_us m = case m init_us of { (r,_) -> r }
{-# INLINE thenUs #-}
{-# INLINE returnUs #-}
\begin{code}
fixUs :: (a -> UniqSM a) -> UniqSM a
fixUs m us
- = r where r = m r us
+ = (r,us') where (r,us') = m r us
thenUs :: UniqSM a -> (a -> UniqSM b) -> UniqSM b
-
thenUs expr cont us
- = case (splitUniqSupply us) of { (s1, s2) ->
- case (expr s1) of { result ->
- cont result s2 }}
-\end{code}
+ = case (expr us) of { (result, us') -> cont result us' }
+
+thenUs_ :: UniqSM a -> UniqSM b -> UniqSM b
+thenUs_ expr cont us
+ = case (expr us) of { (_, us') -> cont us' }
-\begin{code}
returnUs :: a -> UniqSM a
-returnUs result us = result
+returnUs result us = (result, us)
+
+getUs :: UniqSM UniqSupply
+getUs us = (us, panic "getUs: bad supply")
+setUs :: UniqSupply -> UniqSM ()
+setUs us old_us = ((), us)
+
+getUniqueUs :: UniqSM Unique
+getUniqueUs us = case splitUniqSupply us of
+ (us1,us2) -> (uniqFromSupply us1, us2)
+
+getUniquesUs :: Int -> UniqSM [Unique]
+getUniquesUs n us = case splitUniqSupply us of
+ (us1,us2) -> (uniqsFromSupply n us1, us2)
+\end{code}
+
+\begin{code}
mapUs :: (a -> UniqSM b) -> [a] -> UniqSM [b]
mapUs f [] = returnUs []