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Algebraic Effect Handlers for Clojure

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# Cleff

Cleff provides a framework for extensible handling of computational effects.

The design is heavily inspired by the Eff programming language. This project
aims to provide a proof of concept implementation of all of the examples in
[Programming with Algebraic Effects and Handlers][1] by Bauer and Pretnar.

## Status

The basics of first-class effects and handlers are working.

Here's a simple non-deterministic choice effect:

```clojure
(defn choose-all [c]
  (handler
    (value [x] [x])
    c
    (decide []
      (concat (continue true) (continue false)))))

(let [c (choice)]
  (handle-with (choose-all c)
    (let [x (if (effect c 'decide) 10 20)
          y (if (effect c 'decide) 0 5)]
      (- x y))))
;;=> (10 5 20 15)
```

Lots left to do:

- Polish up the syntax
- defprotocol-style defeffect
- Subroutines for coping with core.async's lexical IOC

See the `test/` directory for some more examples.

## License

Distributed under the Eclipse Public License, the same as Clojure.

[1]: http://math.andrej.com/2012/03/08/programming-with-algebraic-effects-and-handlers/

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