Control.Comonad.Trans.Traced

The trace comonad builds up a result by prepending monoidal values to each other.

This module specifies the traced comonad transformer (aka the cowriter or exponential comonad transformer).

Traced comonad

type Traced m = TracedT m Identity

traced :: (m -> a) -> Traced m a

runTraced :: Traced m a -> m -> a

Traced comonad transformer

newtype TracedT m w a

Constructors

TracedT

Fields

• runTracedT :: w (m -> a)

Instances

(ComonadEnv e w, Monoid m) => ComonadEnv e (TracedT m w)

Methods

ask :: TracedT m w a -> e

(ComonadStore s w, Monoid m) => ComonadStore s (TracedT m w)

Methods

pos :: TracedT m w a -> s

peek :: s -> TracedT m w a -> a

peeks :: (s -> s) -> TracedT m w a -> a

seek :: s -> TracedT m w a -> TracedT m w a

seeks :: (s -> s) -> TracedT m w a -> TracedT m w a

experiment :: Functor f => (s -> f s) -> TracedT m w a -> f a

(Comonad w, Monoid m) => ComonadTraced m (TracedT m w)

Methods

trace :: m -> TracedT m w a -> a

ComonadHoist (TracedT m)

Methods

cohoist :: (Comonad w, Comonad v) => (forall x. w x -> v x) -> TracedT m w a -> TracedT m v a

Monoid m => ComonadTrans (TracedT m)

Methods

lower :: Comonad w => TracedT m w a -> w a

Functor w => Functor (TracedT m w)

Methods

fmap :: (a -> b) -> TracedT m w a -> TracedT m w b

(<$) :: a -> TracedT m w b -> TracedT m w a

Applicative w => Applicative (TracedT m w)

Methods

pure :: a -> TracedT m w a

(<*>) :: TracedT m w (a -> b) -> TracedT m w a -> TracedT m w b

(*>) :: TracedT m w a -> TracedT m w b -> TracedT m w b

(<*) :: TracedT m w a -> TracedT m w b -> TracedT m w a

Distributive w => Distributive (TracedT m w)

Methods

distribute :: Functor f => f (TracedT m w a) -> TracedT m w (f a)

collect :: Functor f => (a -> TracedT m w b) -> f a -> TracedT m w (f b)

distributeM :: Monad m => m (TracedT m w a) -> TracedT m w (m a)

collectM :: Monad m => (a -> TracedT m w b) -> m a -> TracedT m w (m b)

(ComonadApply w, Monoid m) => ComonadApply (TracedT m w)

Methods

(<@>) :: TracedT m w (a -> b) -> TracedT m w a -> TracedT m w b

(@>) :: TracedT m w a -> TracedT m w b -> TracedT m w b

(<@) :: TracedT m w a -> TracedT m w b -> TracedT m w a

(Comonad w, Monoid m) => Comonad (TracedT m w)

Methods

extract :: TracedT m w a -> a

duplicate :: TracedT m w a -> TracedT m w (TracedT m w a)

extend :: (TracedT m w a -> b) -> TracedT m w a -> TracedT m w b

Operations

trace :: Comonad w => m -> TracedT m w a -> a

listen :: Functor w => TracedT m w a -> TracedT m w (a, m)

listens :: Functor w => (m -> b) -> TracedT m w a -> TracedT m w (a, b)

censor :: Functor w => (m -> m) -> TracedT m w a -> TracedT m w a