Portability | portable |
---|---|

Stability | provisional |

Maintainer | Edward Kmett <ekmett@gmail.com> |

The trace comonad transformer (aka the cowriter or exponential comonad transformer).

- type Traced m = TracedT m Identity
- traced :: (m -> a) -> Traced m a
- runTraced :: Monoid m => Traced m a -> m -> a
- newtype TracedT m w a = TracedT {
- runTracedT :: w (m -> a)

- trace :: (Comonad w, Monoid m) => 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