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Add instances for (GHC.Generics.:+:) #75

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8 changes: 8 additions & 0 deletions universe-some/src/Data/Universe/Some.hs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE Safe #-}
module Data.Universe.Some (
Expand All @@ -12,6 +13,7 @@ import Data.Some (Some, mapSome, mkSome, foldSome)
import Data.Type.Equality ((:~:) (..))
import Data.Universe.Class (Universe (..), Finite (..))
import Data.Universe.Helpers (Tagged (..), Natural, (+++))
import GHC.Generics ((:+:) (..))

import qualified Data.Some.GADT as G
import qualified Data.Some.Newtype as N
Expand Down Expand Up @@ -95,6 +97,12 @@ instance (UniverseSome f, UniverseSome g) => UniverseSome (Sum f g) where
instance (FiniteSome f, FiniteSome g) => FiniteSome (Sum f g) where
universeFSome = map (mapSome InL) universeFSome ++ map (mapSome InR) universeFSome

instance (UniverseSome f, UniverseSome g) => UniverseSome (f :+: g) where
universeSome = map (mapSome L1) universeSome +++ map (mapSome R1) universeSome

instance (FiniteSome f, FiniteSome g) => FiniteSome (f :+: g) where
universeFSome = map (mapSome L1) universeFSome ++ map (mapSome R1) universeFSome

-- Note: Product instance is tricky, we could for special cases.
-- e.g. '(GEq f, f ~ g) => UnvierseSome (Product f g)', but this is boring
-- instance as we'd 'Pair' equal instances only.