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Use Sequence instead of List in Floodgate #80

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Use Sequence instead of List in Floodgate #80

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7 changes: 4 additions & 3 deletions src/Polysemy/Floodgate.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ module Polysemy.Floodgate
) where

import Control.Monad
import Data.Sequence (Seq, (|>))
import GHC.Types
import Polysemy
import Polysemy.State
Expand All @@ -36,17 +37,17 @@ makeSem ''Floodgate
runFloodgate
:: Sem (Floodgate ': r) a
-> Sem r a
runFloodgate = fmap snd . runState @[Any] [] . reinterpretH
runFloodgate = fmap snd . runState @(Seq Any) Seq.empty . reinterpretH
( \case
Hold m -> do
m' <- fmap void $ runT m
-- These 'Any's are here because the monadic action references 'r', and
-- if we exposed that, 'r' would be an infinite type
modify (unsafeCoerce @_ @Any (raise $ runFloodgate m') :)
modify (unsafeCoerce @_ @Any (raise $ runFloodgate m') |>)
getInitialStateT

Release -> do
ms' <- gets @[Any] (fmap unsafeCoerce . reverse)
ms' <- gets @(Seq Any) (fmap unsafeCoerce)
sequence_ ms'
getInitialStateT
)
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