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Move ccase_SList into All class #149

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Move ccase_SList into All class #149

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31 changes: 18 additions & 13 deletions sop-core/src/Data/SOP/Constraint.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -73,28 +73,33 @@ class (AllF c xs, SListI xs) => All (c :: k -> Constraint) (xs :: [k]) where
-> (forall y ys . (c y, All c ys) => r ys -> r (y ': ys))
-> r xs

-- | Constrained case distinction on a type-level list.
--
-- @since 0.4.0.0
--
ccase_SList ::
All c xs
=> proxy c
-> ((xs ~ '[]) => r '[])
-> (forall y ys . (c y, All c ys, (y ': ys) ~ xs) => r (y ': ys))
-> r xs

instance All c '[] where
cpara_SList _p nil _cons = nil
{-# INLINE cpara_SList #-}

ccase_SList _p nil _cons =
nil
{-# INLINE ccase_SList #-}

instance (c x, All c xs) => All c (x ': xs) where
cpara_SList p nil cons =
cons (cpara_SList p nil cons)
{-# INLINE cpara_SList #-}

-- | Constrained case distinction on a type-level list.
--
-- @since 0.4.0.0
--
ccase_SList ::
All c xs
=> proxy c
-> r '[]
-> (forall y ys . (c y, All c ys) => r (y ': ys))
-> r xs
ccase_SList p nil cons =
cpara_SList p nil (const cons)
{-# INLINE ccase_SList #-}
ccase_SList _p _nil cons =
cons
{-# INLINE ccase_SList #-}

-- | Type family used to implement 'All'.
--
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