cleanup

[hs-rrdtool.git] / Data / HList / Prelude.hs

diff --git a/Data/HList/Prelude.hs b/Data/HList/Prelude.hs
index b3e6b95bd4da779bced5e300c757b9a534b72866..b3a88fdb0c2371d20828f9ecf802f993a431d264 100644 (file)
--- a/Data/HList/Prelude.hs
+++ b/Data/HList/Prelude.hs
@@ -1,9 +1,11 @@
 module Data.HList.Prelude
     ( HList
+
     , HNil(..)
     , hNil
-    , (:*:)(..)
-    , (.*.)
+
+    , HCons(..)
+    , hCons
 
     , HExtendable(..)
     , HAppendable(..)
@@ -36,31 +38,31 @@ instance HList HNil
 hNil :: HNil
 hNil = HNil
 
--- :*:
-infixr 2 :*:
-infixr 2 .*.
-
-data e :*: l
-    = e :*: l
+-- HCons
+data HCons e l
+    = HCons e l
       deriving (Show, Eq, Ord, Read, Typeable)
 
-instance HList l => HList (e :*: l)
+instance HList l => HList (HCons e l)
 
-(.*.) :: HList l => e -> l -> e :*: l
-(.*.) = (:*:)
+hCons :: HList l => e -> l -> HCons e l
+hCons = HCons
 
 -- HExtendable
+infixr 2 :*:
+infixr 2 .*.
+
 class HExtendable e l where
-    type HExtend e l
-    hExtend :: e -> l -> HExtend e l
+    type e :*: l
+    (.*.) :: e -> l -> e :*: l
 
 instance HExtendable e HNil where
-    type HExtend e HNil = e :*: HNil
-    hExtend e nil = e .*. nil
+    type e :*: HNil = HCons e HNil
+    e .*. nil = hCons e nil
 
-instance HList l => HExtendable e (e' :*: l) where
-    type HExtend e (e' :*: l) = e :*: e' :*: l
-    hExtend e (e' :*: l) = e .*. e' .*. l
+instance HList l => HExtendable e (HCons e' l) where
+    type e :*: HCons e' l = HCons e (HCons e' l)
+    e .*. HCons e' l = hCons e (hCons e' l)
 
 -- HAppendable
 infixr 1 :++:
@@ -74,11 +76,11 @@ instance HList l => HAppendable HNil l where
     type HNil :++: l = l
     _ .++. l = l
 
-instance ( HAppendable l l'
-         , HList (l :++: l')
-         ) => HAppendable (e :*: l) l' where
-    type (e :*: l) :++: l' = e :*: (l :++: l')
-    (e :*: l) .++. l' = e .*. (l .++. l')
+instance ( HList (l :++: l')
+         , HAppendable l l'
+         ) => HAppendable (HCons e l) l' where
+    type HCons e l :++: l' = HCons e (l :++: l')
+    (HCons e l) .++. l' = hCons e (l .++. l')
 
 -- Applyable
 class Applyable f a where
@@ -115,9 +117,9 @@ instance HFoldrable f v HNil where
 
 instance ( HFoldrable f v l
          , Applyable2 f e (HFoldr f v l)
-         ) => HFoldrable f v (e :*: l) where
-    type HFoldr f v (e :*: l) = Apply2 f e (HFoldr f v l)
-    hFoldr f v (e :*: l) = apply2 f e (hFoldr f v l)
+         ) => HFoldrable f v (HCons e l) where
+    type HFoldr f v (HCons e l) = Apply2 f e (HFoldr f v l)
+    hFoldr f v (HCons e l) = apply2 f e (hFoldr f v l)
 
 -- HConcatable
 class HConcatable ls where
@@ -135,11 +137,11 @@ class HMappable f l where
 
 instance HMappable f HNil where
     type HMap f HNil = HNil
-    hMap _ _ = HNil
+    hMap _ _ = hNil
 
-instance ( HList (HMap f xs)
-         , Applyable f x
+instance ( Applyable f x
          , HMappable f xs
-         ) => HMappable f (x :*: xs) where
-    type HMap f (x :*: xs) = Apply f x :*: HMap f xs
-    hMap f (x :*: xs) = apply f x .*. hMap f xs
+         , HList (HMap f xs)
+         ) => HMappable f (HCons x xs) where
+    type HMap f (HCons x xs) = HCons (Apply f x) (HMap f xs)
+    hMap f (HCons x xs) = hCons (apply f x) (hMap f xs)