monad-wrap: Wrap functions such as catch around different monads

This package allows you to invoke a function on one monadic type passing it an argument of a different monadic type. The canonical example of this is wanting to use a function such as finally :: IO a -> IO a to catch exceptions thrown by a computation x :: ReaderT MyConfig IO b. If x uses the ReaderT function ask, it cannot be re-written to run in the IO monad, and hence cannot be executed with a construction like lift (x `finally` cleanup). Instead, you must use the wrap method, provide by module Control.Monad.Wrap. This package contains two further modules: Control.Monad.MultiWrap implements mwrap, a method that behaves like wrap but allows wrapping through multiple nested layers of monad transformer. The module Control.Monad.MultiLift provides mlift, a version of lift that similarly lifts through multiple nested monad transformers.

Modules

[Index]

Downloads

• monad-wrap-0.0.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• DavidMazieres

For package maintainers and hackage trustees

• edit package information

Candidates

• No Candidates