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+%
+% (c) The AQUA Project, Glasgow University, 1994-1998
+%
+\section[UniqSet]{Specialised sets, for things with @Uniques@}
+
+Based on @UniqFMs@ (as you would expect).
+
+Basically, the things need to be in class @Uniquable@.
+
+\begin{code}
+module UniqSet (
+	UniqSet,    -- abstract type: NOT
+
+	mkUniqSet, uniqSetToList, emptyUniqSet, unitUniqSet,
+	addOneToUniqSet, addListToUniqSet, delOneFromUniqSet, delListFromUniqSet,
+	unionUniqSets, unionManyUniqSets, minusUniqSet,
+	elementOfUniqSet, mapUniqSet, intersectUniqSets,
+	isEmptyUniqSet, filterUniqSet, sizeUniqSet, foldUniqSet,
+	elemUniqSet_Directly, lookupUniqSet, hashUniqSet
+    ) where
+
+#include "HsVersions.h"
+
+import {-# SOURCE #-} Name ( Name )
+
+import Maybes		( maybeToBool )
+import UniqFM
+import Unique		( Unique, Uniquable(..) )
+
+#if ! OMIT_NATIVE_CODEGEN
+#define IF_NCG(a) a
+#else
+#define IF_NCG(a) {--}
+#endif
+\end{code}
+
+%************************************************************************
+%*									*
+\subsection{The @UniqSet@ type}
+%*									*
+%************************************************************************
+
+We use @UniqFM@, with a (@getUnique@-able) @Unique@ as ``key''
+and the thing itself as the ``value'' (for later retrieval).
+
+\begin{code}
+--data UniqSet a = MkUniqSet (FiniteMap Unique a) : NOT
+
+type UniqSet a = UniqFM a
+#define MkUniqSet {--}
+
+emptyUniqSet :: UniqSet a
+emptyUniqSet = MkUniqSet emptyUFM
+
+unitUniqSet :: Uniquable a => a -> UniqSet a
+unitUniqSet x = MkUniqSet (unitUFM x x)
+
+uniqSetToList :: UniqSet a -> [a]
+uniqSetToList (MkUniqSet set) = eltsUFM set
+
+foldUniqSet :: (a -> b -> b) -> b -> UniqSet a -> b
+foldUniqSet k z (MkUniqSet set) = foldUFM k z set 
+
+mkUniqSet :: Uniquable a => [a]  -> UniqSet a
+mkUniqSet xs = MkUniqSet (listToUFM [ (x, x) | x <- xs])
+
+addOneToUniqSet :: Uniquable a => UniqSet a -> a -> UniqSet a
+addOneToUniqSet (MkUniqSet set) x = MkUniqSet (addToUFM set x x)
+
+delOneFromUniqSet :: Uniquable a => UniqSet a -> a -> UniqSet a
+delOneFromUniqSet (MkUniqSet set) x = MkUniqSet (delFromUFM set x)
+
+delListFromUniqSet :: Uniquable a => UniqSet a -> [a] -> UniqSet a
+delListFromUniqSet (MkUniqSet set) xs = MkUniqSet (delListFromUFM set xs)
+
+addListToUniqSet :: Uniquable a => UniqSet a -> [a] -> UniqSet a
+addListToUniqSet (MkUniqSet set) xs = MkUniqSet (addListToUFM set [(x,x) | x<-xs])
+
+unionUniqSets :: UniqSet a -> UniqSet a -> UniqSet a
+unionUniqSets (MkUniqSet set1) (MkUniqSet set2) = MkUniqSet (plusUFM set1 set2)
+
+unionManyUniqSets :: [UniqSet a] -> UniqSet a
+	-- = foldr unionUniqSets emptyUniqSet ss
+unionManyUniqSets []	 = emptyUniqSet
+unionManyUniqSets [s]	 = s
+unionManyUniqSets (s:ss) = s `unionUniqSets` unionManyUniqSets ss
+
+minusUniqSet  :: UniqSet a -> UniqSet a -> UniqSet a
+minusUniqSet (MkUniqSet set1) (MkUniqSet set2) = MkUniqSet (minusUFM set1 set2)
+
+filterUniqSet :: (a -> Bool) -> UniqSet a -> UniqSet a
+filterUniqSet pred (MkUniqSet set) = MkUniqSet (filterUFM pred set)
+
+intersectUniqSets :: UniqSet a -> UniqSet a -> UniqSet a
+intersectUniqSets (MkUniqSet set1) (MkUniqSet set2) = MkUniqSet (intersectUFM set1 set2)
+
+elementOfUniqSet :: Uniquable a => a -> UniqSet a -> Bool
+elementOfUniqSet x (MkUniqSet set) = maybeToBool (lookupUFM set x)
+
+lookupUniqSet :: Uniquable a => UniqSet a -> a -> Maybe a
+lookupUniqSet (MkUniqSet set) x = lookupUFM set x
+
+elemUniqSet_Directly :: Unique -> UniqSet a -> Bool
+elemUniqSet_Directly x (MkUniqSet set) = maybeToBool (lookupUFM_Directly set x)
+
+sizeUniqSet :: UniqSet a -> Int
+sizeUniqSet (MkUniqSet set) = sizeUFM set
+
+hashUniqSet :: UniqSet a -> Int
+hashUniqSet (MkUniqSet set) = hashUFM set
+
+isEmptyUniqSet :: UniqSet a -> Bool
+isEmptyUniqSet (MkUniqSet set) = isNullUFM set {-SLOW: sizeUFM set == 0-}
+
+mapUniqSet :: (a -> a) -> UniqSet a -> UniqSet a
+  -- VERY IMPORTANT: *assumes* that the function doesn't change the unique
+mapUniqSet f (MkUniqSet set) = MkUniqSet (mapUFM f set)
+\end{code}
+
+\begin{code}
+#if __GLASGOW_HASKELL__
+{-# SPECIALIZE
+    addOneToUniqSet :: UniqSet Unique -> Unique -> UniqSet Unique
+    #-}
+{- SPECIALIZE
+    elementOfUniqSet :: Name -> UniqSet Name -> Bool
+		      , Unique -> UniqSet Unique -> Bool
+    -}
+{- SPECIALIZE
+    mkUniqSet :: [Name] -> UniqSet Name
+    -}
+
+{- SPECIALIZE
+    unitUniqSet :: Name -> UniqSet Name
+		 , Unique -> UniqSet Unique
+    -}
+#endif
+\end{code}