| Copyright | (C) 2008-2014 Edward Kmett |
|---|---|
| License | BSD-style (see the file LICENSE) |
| Maintainer | Edward Kmett <ekmett@gmail.com> |
| Stability | provisional |
| Portability | portable |
| Safe Haskell | Safe |
| Language | Haskell2010 |
Control.Comonad.Trans.Traced
Description
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).
- type Traced m = TracedT m Identity
- traced :: (m -> a) -> Traced m a
- runTraced :: Traced m a -> m -> a
- newtype TracedT m w a = TracedT {
- runTracedT :: w (m -> a)
- 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
Traced comonad
Traced comonad transformer
Constructors
| TracedT | |
Fields
| |
Instances
| (ComonadEnv e w, Monoid m) => ComonadEnv e (TracedT m w) | |
| (ComonadStore s w, Monoid m) => ComonadStore s (TracedT m w) | |
| (Comonad w, Monoid m) => ComonadTraced m (TracedT m w) | |
| Monoid m => ComonadTrans (TracedT m) | |
| Monoid m => ComonadHoist (TracedT m) | |
| Functor w => Functor (TracedT m w) | |
| Applicative w => Applicative (TracedT m w) | |
| Distributive w => Distributive (TracedT m w) | |
| (ComonadApply w, Monoid m) => ComonadApply (TracedT m w) | |
| (Comonad w, Monoid m) => Comonad (TracedT m w) | |
| Typeable (* -> (* -> *) -> * -> *) TracedT |