monad-io-adapter alternatives and similar packages
Based on the "monad" category
Do you think we are missing an alternative of monad-io-adapter or a related project?
This Haskell package provides utilities for converting between computations parameterized via two different typeclasses, both of which can be used to abstract over monad transformer stacks with
IO at the base. Unfortunately, both classes are frequently used in the Haskell ecosystem, since they have minor differences:
MonadIOcomes from the
basepackage (as of
baseversion 126.96.36.199), and it provides a
liftIOoperation. It is an extremely simple typeclass, focusing exclusively on lifting
IOactions through transformer stacks with
IOat the base.
MonadBasecomes from the
transformers-basepackage, and it is a generalized version of
MonadIO. It provides a more general
liftBasefunction, which allows lifting to an arbitrary base monad.
Generally, this additional power isn’t especially useful, but
MonadBaseappears most often through
MonadBaseControl, a subclass from the
monad-controlpackage that enables lifting operations that accept an action in negative position. This class has no
IO-specialized equivalent (not directly, at least), so it often appears in lifted “control” operations.
Due to these typeclasses being unrelated, it’s not entirely uncommon to end up with type signatures like
(MonadIO m, MonadBaseControl IO m) => ..., which are a little silly, since
MonadBaseControl IO really includes all the power of
For more information, see the documentation on Hackage.