monad-control: Lift control operations, like exception catching, through monad transformers

This package defines the type class MonadBaseControl, a subset of MonadBase into which generic control operations such as catch can be lifted from IO or any other base monad. Instances are based on monad transformers in MonadTransControl, which includes all standard monad transformers in the transformers library except ContT.

See the lifted-base package which uses monad-control to lift IO operations from the base library (like catch or bracket) into any monad that is an instance of MonadBase or MonadBaseControl.

Note that this package is a rewrite of Anders Kaseorg's monad-peel library. The main difference is that this package provides CPS style operators and exploits the RankNTypes and TypeFamilies language extensions to simplify and speedup most definitions.

The following criterion based benchmark shows that monad-control is on average about 99% faster than monad-peel:

git clone https://github.com/basvandijk/bench-monad-peel-control

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Flags

Automatic Flags

Name	Description	Default
instancest	If enabled this package will export MonadBaseControl instances for the lazy and strict ST monad. If disabled these instances are only exported when base >= 4.4. If enabled it is required that the transformer-base package exports MonadBase instances for ST. It will do this by default.	Enabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• monad-control-0.3.2.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

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Package maintainers

• BasVanDijk, phadej

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Candidates

• 1.0.2.3