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🔥 the MonadDead module.

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Rob Rix 2018-03-01 16:06:56 -05:00
parent ab9e129778
commit e1a45b9997
2 changed files with 0 additions and 24 deletions
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semantic-diff.cabal
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@ -38,7 +38,6 @@ library
, Control.Effect
-- Effects used for program analysis
-- , Control.Monad.Effect.Cache
-- , Control.Monad.Effect.Dead
, Control.Monad.Effect.Fresh
-- , Control.Monad.Effect.GC
-- , Control.Monad.Effect.NonDet

23
src/Control/Monad/Effect/Dead.hs
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@ -1,23 +0,0 @@
{-# LANGUAGE GeneralizedNewtypeDeriving, MultiParamTypeClasses, TypeOperators, UndecidableInstances #-}
module Control.Monad.Effect.Dead where
import Prologue
import Data.Set (delete)
import Control.Monad.Effect
import Control.Monad.Effect.State
-- | A set of “dead” (unreachable) terms.
newtype Dead a = Dead { unDead :: Set a }
deriving (Eq, Foldable, Semigroup, Monoid, Ord, Show)
-- | 'Monad's offering a readable & writable set of 'Dead' terms.
class Monad m => MonadDead t m where
-- | Update the current 'Dead' set.
killAll :: Dead t -> m ()
-- | Revive a single term, removing it from the current 'Dead' set.
revive :: Ord t => t -> m ()
instance (State (Dead t) :< fs) => MonadDead t (Eff fs) where
killAll = put
revive t = modify (Dead . delete t . unDead)