This is an extensible effects library for Haskell taking inspiration from the Eff language http://www.eff-lang.org/.

See these papers for the ideas and theory behind the library:

• O. Kammar et al: Handlers in Action! http://homepages.inf.ed.ac.uk/slindley/papers/handlers.pdf

• A. Bauer, M. Pretnar: Programming with Algebraic Effects and Handlers http://arxiv.org/abs/1203.1539

• O Kiselyov, A Sabry, C Swords: Extensible Effects http://dl.acm.org/citation.cfm?id=2503791

Implementation wise it's most close to extensible-effects http://hackage.haskell.org/package/extensible-effects (also see the Extensible Effects paper) but it implements deep handlers instead of shallow.

import Control.Effects.Cont.Eff
import Control.Effects.Cont.Reader
import Control.Effects.Cont.Exception

program = do
  v <- ask
  if v < 15
  then throw $ show v
  else return (v+1)

run n = runPure . handle exceptionHandler . handle (readerHandler n)

res :: Integer -> Either String Integer
res n = run n program

---

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