commit
6dc3043254
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@ -0,0 +1,33 @@
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steps:
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- simple_align:
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cases: true
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top_level_patterns: true
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records: true
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- imports:
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align: file
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list_align: after_alias
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pad_module_names: false
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long_list_align: new_line_multiline
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empty_list_align: inherit
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list_padding: 2
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separate_lists: false
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space_surround: false
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- language_pragmas:
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style: vertical
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align: false
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remove_redundant: true
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- tabs:
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spaces: 2
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- trailing_whitespace: {}
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columns: 120
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newline: native
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language_extensions:
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- FlexibleContexts
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- MultiParamTypeClasses
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@ -33,7 +33,7 @@ library
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Control.Effect.Exception
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build-depends:
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base >= 4.7 && < 5
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, fused-effects >= 1
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, fused-effects >= 1.1
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, transformers >= 0.4 && < 0.6
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test-suite test
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@ -1,4 +1,12 @@
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{-# LANGUAGE FlexibleInstances, GeneralizedNewtypeDeriving, MultiParamTypeClasses, RankNTypes, TypeOperators, UndecidableInstances #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE GADTs #-}
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{-# LANGUAGE GeneralizedNewtypeDeriving #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeOperators #-}
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{-# LANGUAGE UndecidableInstances #-}
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{- | A carrier for the 'State' effect. It uses an 'IORef' internally to handle its state, and thus is safe to use with "Control.Carrier.Resource". Underlying 'IORef' operations are performed with 'readIORef' and 'writeIORef'.
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@ -14,8 +22,8 @@ module Control.Carrier.State.IORef
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, module Control.Effect.State
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) where
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import Control.Applicative (Alternative (..))
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import Control.Algebra
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import Control.Applicative (Alternative(..))
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import Control.Carrier.Reader
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import Control.Effect.State
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import Control.Monad (MonadPlus(..))
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@ -62,11 +70,12 @@ execState s = fmap fst . runState s
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newtype StateC s m a = StateC { runStateC :: ReaderC (IORef s) m a }
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deriving (Alternative, Applicative, Functor, Monad, Fail.MonadFail, MonadFix, MonadIO, MonadPlus)
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instance (MonadIO m, Algebra sig m, Effect sig) => Algebra (State s :+: sig) (StateC s m) where
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alg (L act) = do
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ref <- StateC ask
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case act of
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Put s k -> liftIO (writeIORef ref s) *> k
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Get k -> liftIO (readIORef ref) >>= k
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alg (R other) = StateC (alg (R (handleCoercible other)))
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instance (MonadIO m, Algebra sig m) => Algebra (State s :+: sig) (StateC s m) where
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alg hdl sig ctx = case sig of
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L act -> do
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ref <- StateC (ask @(IORef s))
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(<$ ctx) <$> case act of
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Put s -> liftIO (writeIORef ref s)
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Get -> liftIO (readIORef ref)
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R other -> StateC (alg (runStateC . hdl) (R other) ctx)
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{-# INLINE alg #-}
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@ -92,13 +92,13 @@ throwTo thread = sendM . Exc.throwTo thread
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--
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-- @since 1.0.0.0
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catch :: (Exc.Exception e, Has (Lift IO) sig m) => m a -> (e -> m a) -> m a
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catch m h = liftWith $ \ ctx run -> run (m <$ ctx) `Exc.catch` (run . (<$ ctx) . h)
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catch m h = liftWith $ \ run ctx -> run (m <$ ctx) `Exc.catch` (run . (<$ ctx) . h)
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-- | See @"Control.Exception".'Exc.catches'@.
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--
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-- @since 1.0.0.0
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catches :: Has (Lift IO) sig m => m a -> [Handler m a] -> m a
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catches m hs = liftWith $ \ ctx run ->
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catches m hs = liftWith $ \ run ctx ->
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Exc.catches (run (m <$ ctx)) (map (\ (Handler h) -> Exc.Handler (run . (<$ ctx) . h)) hs)
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-- | See @"Control.Exception".'Exc.Handler'@.
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@ -118,7 +118,7 @@ catchJust
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-> m a
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-> (b -> m a)
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-> m a
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catchJust p m h = liftWith $ \ ctx run -> Exc.catchJust p (run (m <$ ctx)) (run . (<$ ctx) . h)
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catchJust p m h = liftWith $ \ run ctx -> Exc.catchJust p (run (m <$ ctx)) (run . (<$ ctx) . h)
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-- | See @"Control.Exception".'Exc.handle'@.
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--
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@ -159,8 +159,8 @@ evaluate = sendM . Exc.evaluate
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--
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-- @since 1.0.0.0
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mask :: Has (Lift IO) sig m => ((forall a . m a -> m a) -> m b) -> m b
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mask with = liftWith $ \ ctx run -> Exc.mask $ \ restore ->
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run (with (\ m -> liftWith $ \ ctx' run' -> restore (run' (m <$ ctx'))) <$ ctx)
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mask with = liftWith $ \ run ctx -> Exc.mask $ \ restore ->
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run (with (\ m -> liftWith $ \ run' ctx' -> restore (run' (m <$ ctx'))) <$ ctx)
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-- | See @"Control.Exception".'Exc.mask_'@.
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--
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@ -172,8 +172,8 @@ mask_ m = mask $ const m
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--
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-- @since 1.0.0.0
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uninterruptibleMask :: Has (Lift IO) sig m => ((forall a . m a -> m a) -> m b) -> m b
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uninterruptibleMask with = liftWith $ \ ctx run -> Exc.uninterruptibleMask $ \ restore ->
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run (with (\ m -> liftWith $ \ ctx' run' -> restore (run' (m <$ ctx'))) <$ ctx)
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uninterruptibleMask with = liftWith $ \ run ctx -> Exc.uninterruptibleMask $ \ restore ->
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run (with (\ m -> liftWith $ \ run' ctx' -> restore (run' (m <$ ctx'))) <$ ctx)
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-- | See @"Control.Exception".'Exc.uninterruptibleMask_'@.
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--
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--
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-- @since 1.0.0.0
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interruptible :: Has (Lift IO) sig m => m a -> m a
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interruptible m = liftWith $ \ ctx run -> Exc.interruptible (run (m <$ ctx))
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interruptible m = liftWith $ \ run ctx -> Exc.interruptible (run (m <$ ctx))
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-- | See @"Control.Exception".'Exc.allowInterrupt'@.
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--
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