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Add runNonDetFinal [WIP] #493

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Add runNonDetFinal [WIP] #493

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17 changes: 17 additions & 0 deletions src/Polysemy/NonDet.hs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,9 @@
{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE UndecidableInstances #-}

-- | Description: Interpreters for 'NonDet'
module Polysemy.NonDet
Expand All @@ -18,6 +22,7 @@ import Data.Maybe

import Polysemy
import Polysemy.Error
import Polysemy.Final (Final, interpretFinal, liftS, runS)
import Polysemy.Internal
import Polysemy.Internal.NonDet
import Polysemy.Internal.Union
Expand Down Expand Up @@ -72,6 +77,18 @@ nonDetToError (e :: e) = interpretH $ \case
{-# INLINE nonDetToError #-}


------------------------------------------------------------------------------
-- | Run a 'NonDet' effect in terms of the 'Final' 'Alternative' @m@.
runNonDetFinal :: (Member (Final m) r, Alternative m) => Sem (NonDet ': r) a -> Sem r a
runNonDetFinal = interpretFinal $ \case
Empty -> liftS empty
Choose semA semB -> do
a <- runS semA
b <- runS semB
pure $ a <|> b
{-# INLINE runNonDetFinal #-}


--------------------------------------------------------------------------------
-- This stuff is lifted from 'fused-effects'. Thanks guys!
runNonDetC :: (Alternative f, Applicative m) => NonDetC m a -> m (f a)
Expand Down