THEff: TH implementation of effects.

[ bsd3, control, effect, library, th- ] [ Propose Tags ] [ Report a vulnerability ]

This package implements effects, as alternative to monad transformers. Actually, the effects themselves are created without the use of TH, but the binding of nested effects described by mkEff splice. For example.

mkEff "MyReader"    ''Reader    ''Int       ''Lift
mkEff "SomeState"   ''State     ''Bool      ''MyReader
mkEff "OtherRdr"    ''Reader    ''Float     ''SomeState

main:: IO ()
main = do
    r <- runMyReader  100
       $ runSomeState False
       $ runOtherRdr  pi  $ do
            i :: Int   <- ask                    -- MyReader
            f :: Float <- ask                    -- OtherRdr
            b <- get                             -- SomeState
            put $ not b                          -- SomeState
            lift $ putStrLn "print from effect!" -- Lift
            return $ show $ fromIntegral i * f
    print r

For more information about extensible effects , see the original paper at http://okmij.org/ftp/Haskell/extensible/exteff.pdf. But, this package is significantly different from the original. It uses a chains of ordinary GADTs created by TH. No Typeable, no unsafe... , no ExistentialQuantification ...


[Skip to Readme]

Downloads

Maintainer's Corner

Package maintainers

For package maintainers and hackage trustees

Candidates

Versions [RSS] 0.1.0.1, 0.1.1.0, 0.1.3, 0.1.4
Change log changelog
Dependencies base (>=4.7 && <5), template-haskell (>=2.11) [details]
License BSD-3-Clause
Author Kolodezny Diver
Maintainer kolodeznydiver@gmail.com
Category Control, Effect, TH
Source repo head: git clone https://github.com/KolodeznyDiver/THEff.git
Uploaded by kolodeznydiver at 2017-01-22T20:05:07Z
Distributions
Reverse Dependencies 1 direct, 0 indirect [details]
Downloads 3178 total (3 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Docs available [build log]
Last success reported on 2017-01-22 [all 1 reports]

Readme for THEff-0.1.3

[back to package description]

THEff

This package implements effects, as alternative to monad transformers. Actually, the effects themselves are created without the use of TH, but the binding of nested effects described by mkEff splice. For more information about extensible effects , see the original paper at http://okmij.org/ftp/Haskell/extensible/exteff.pdf. But, this package is significantly different from the original. It uses a chains of ordinary GADTs created by TH. No Typeable, unsafe... , ExistentialQuantification ...