Control.Carrier.Trace.Returning

A carrier for the Trace effect that aggregates and returns all traced values.

Since: 1.0.0.0

Trace carrier

runTrace :: Functor m => TraceC m a -> m ([String], a)

Run a Trace effect, returning all traces as a list.

runTrace (pure a) = pure ([], a)

runTrace (trace s) = pure ([s], ())

Since: 1.0.0.0

newtype TraceC m a

Since: 1.0.0.0

Constructors

TraceC (WriterC (Endo [String]) m a)

Instances

MonadTrans TraceC

Defined in Control.Carrier.Trace.Returning

Methods

lift :: Monad m => m a -> TraceC m a

Monad m => Monad (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

(>>=) :: TraceC m a -> (a -> TraceC m b) -> TraceC m b

(>>) :: TraceC m a -> TraceC m b -> TraceC m b

return :: a -> TraceC m a

Functor m => Functor (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

fmap :: (a -> b) -> TraceC m a -> TraceC m b

(<$) :: a -> TraceC m b -> TraceC m a

MonadFix m => MonadFix (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

mfix :: (a -> TraceC m a) -> TraceC m a

MonadFail m => MonadFail (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

fail :: String -> TraceC m a

Monad m => Applicative (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

pure :: a -> TraceC m a

(<*>) :: TraceC m (a -> b) -> TraceC m a -> TraceC m b

liftA2 :: (a -> b -> c) -> TraceC m a -> TraceC m b -> TraceC m c

(*>) :: TraceC m a -> TraceC m b -> TraceC m b

(<*) :: TraceC m a -> TraceC m b -> TraceC m a

MonadIO m => MonadIO (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

liftIO :: IO a -> TraceC m a

(Alternative m, Monad m) => Alternative (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

empty :: TraceC m a

(<|>) :: TraceC m a -> TraceC m a -> TraceC m a

some :: TraceC m a -> TraceC m [a]

many :: TraceC m a -> TraceC m [a]

(Alternative m, Monad m) => MonadPlus (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

mzero :: TraceC m a

mplus :: TraceC m a -> TraceC m a -> TraceC m a

Algebra sig m => Algebra (Trace :+: sig) (TraceC m)

Defined in Control.Carrier.Trace.Returning

Methods

alg :: forall ctx (n :: Type -> Type) a. Functor ctx => Handler ctx n (TraceC m) -> (Trace :+: sig) n a -> ctx () -> TraceC m (ctx a)

Trace effect

module Control.Effect.Trace