| Portability | portable |
|---|---|
| Stability | provisional |
| Maintainer | Edward Kmett <ekmett@gmail.com> |
| Safe Haskell | None |
Control.Comonad.Hoist.Class
Description
Documentation
class ComonadHoist t where
Methods
cohoist :: Comonad w => t w a -> t Identity a
Ideally we would offer a way to lift comonad homomorphisms but this isn't Haskell 98, so we settle for the most common case here.
liftTrans :: (forall a. w a -> v a) -> t w a -> t v a cohoist = liftTrans (Identity . extract)
Instances
| ComonadHoist IdentityT | |
| ComonadHoist (EnvT e) | |
| ComonadHoist (StoreT s) | |
| (Semigroup m, Monoid m) => ComonadHoist (TracedT m) |