monadclasses alternatives and similar packages
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monadvalidate
DISCONTINUED. (NOTE: REPOSITORY MOVED TO NEW OWNER: https://github.com/lexilambda/monadvalidate) A Haskell monad transformer library for data validation
InfluxDB  Power RealTime Data Analytics at Scale
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README
See this series of articles for the detailed description and motivation.
This is a more flexible version of mtl, the monad transformers library.
You can have many layers of e.g. state transformers in your stack, and you don't have to explicitly lift your
get
s andput
s, as soon as different state transformers carry different types of states.Example:
a :: (MonadState Bool m, MonadState Int m) => m () a = do put False  set the boolean state modify (+ (1 :: Int))  modify the integer state
mtl requires Θ(n2) instances (like
MonadReader e (StateT s m)
); monadclasses requires only Θ(n) of them (where n is the number of different transformer types).If you'd like to define your own monadclassesstyle class, you have to write much less boilerplate code.