[project @ 2001-09-26 15:12:33 by simonpj]

[ghc-hetmet.git] / ghc / compiler / utils / OrdList.lhs

diff --git a/ghc/compiler/utils/OrdList.lhs b/ghc/compiler/utils/OrdList.lhs
index 3e68eb7..d093e43 100644 (file)
--- a/ghc/compiler/utils/OrdList.lhs
+++ b/ghc/compiler/utils/OrdList.lhs
@@ -11,7 +11,7 @@ can be appended in linear time.
 module OrdList (
        OrdList, 
         nilOL, isNilOL, unitOL, appOL, consOL, snocOL, concatOL,
-        fromOL, toOL, foldOL
+        fromOL, toOL, foldrOL, foldlOL
 ) where
 
 infixl 5  `appOL`
@@ -48,11 +48,17 @@ appOL None bs   = bs
 appOL as   None = as
 appOL as   bs   = Two as bs
 
-foldOL :: (a->b->b) -> b -> OrdList a -> b
-foldOL k z None        = z
-foldOL k z (One x)     = k x z
-foldOL k z (Two b1 b2) = foldOL k (foldOL k z b2) b1
-foldOL k z (Many xs)   = foldr k z xs
+foldrOL :: (a->b->b) -> b -> OrdList a -> b
+foldrOL k z None        = z
+foldrOL k z (One x)     = k x z
+foldrOL k z (Two b1 b2) = foldrOL k (foldrOL k z b2) b1
+foldrOL k z (Many xs)   = foldr k z xs
+
+foldlOL :: (b->a->b) -> b -> OrdList a -> b
+foldlOL k z None        = z
+foldlOL k z (One x)     = k z x
+foldlOL k z (Two b1 b2) = foldlOL k (foldlOL k z b1) b2
+foldlOL k z (Many xs)   = foldl k z xs
 
 fromOL :: OrdList a -> [a]
 fromOL ol