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make Control.Category a superclass of GArrow
[ghc-base.git]
/
GHC
/
HetMet
/
GArrow.hs
diff --git
a/GHC/HetMet/GArrow.hs
b/GHC/HetMet/GArrow.hs
index
93d2886
..
9853637
100644
(file)
--- a/
GHC/HetMet/GArrow.hs
+++ b/
GHC/HetMet/GArrow.hs
@@
-1,4
+1,4
@@
-{-# OPTIONS -XRankNTypes -XMultiParamTypeClasses -XNoMonomorphismRestriction -XTypeOperators -XFlexibleInstances #-}
+{-# OPTIONS -XRankNTypes -XMultiParamTypeClasses -XNoMonomorphismRestriction -XTypeOperators -XFlexibleInstances -XFunctionalDependencies #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.HetMet.GArrow
-----------------------------------------------------------------------------
-- |
-- Module : GHC.HetMet.GArrow
@@
-19,10
+19,9
@@
module GHC.HetMet.GArrow (
GArrowReflect(..)
) where
import Control.Arrow
GArrowReflect(..)
) where
import Control.Arrow
+import Control.Category
-class GArrow g (**) where
- ga_id :: g x x
- ga_comp :: g x y -> g y z -> g x z
+class Category g => GArrow g (**) | g -> (**) where
ga_first :: g x y -> g (x ** z) (y ** z)
ga_second :: g x y -> g (z ** x) (z ** y)
ga_cancell :: g (()**x) x
ga_first :: g x y -> g (x ** z) (y ** z)
ga_second :: g x y -> g (z ** x) (z ** y)
ga_cancell :: g (()**x) x
@@
-42,7
+41,7
@@
class GArrow g (**) => GArrowSwap g (**) where
ga_swap :: g (x**y) (y**x)
-- implementation of ga_second for GArrowSwap instances
ga_swap :: g (x**y) (y**x)
-- implementation of ga_second for GArrowSwap instances
-ga_swap_second f = ga_comp (ga_comp ga_swap (ga_first f)) ga_swap
+ga_swap_second f = ga_swap >>> ga_first f >>> ga_swap
class GArrow g (**) => GArrowLoop g (**) where
ga_loop :: g (x**z) (y**z) -> g x y
class GArrow g (**) => GArrowLoop g (**) where
ga_loop :: g (x**z) (y**z) -> g x y
@@
-64,8
+63,6
@@
class GArrow g (**) => GArrowReflect g (**) where
-- GArrow instances for Control.Arrow
instance Arrow a => GArrow a (,) where
-- GArrow instances for Control.Arrow
instance Arrow a => GArrow a (,) where
- ga_id = arr Prelude.id
- ga_comp = (>>>)
ga_first = first
ga_second = second
ga_cancell = arr (\((),x) -> x)
ga_first = first
ga_second = second
ga_cancell = arr (\((),x) -> x)
@@
-84,7
+81,7
@@
instance Arrow a => GArrowCopy a (,) where
instance Arrow a => GArrowSwap a (,) where
ga_swap = arr (\(x,y) -> (y,x))
instance Arrow a => GArrowSwap a (,) where
ga_swap = arr (\(x,y) -> (y,x))
-instance Arrow a => GArrowLiteral a (,) where
+instance Arrow a => GArrowLiteral a (,) b where
ga_literal x = arr (\() -> x)
instance Arrow a => GArrowReify a (,) where
ga_literal x = arr (\() -> x)
instance Arrow a => GArrowReify a (,) where
@@
-94,3
+91,5
@@
instance ArrowLoop a => GArrowLoop a (,) where
ga_loop = loop
ga_loop = loop
+
+