multicall

Like multimethods, but can register multiple calls with the same dispatch value.

Usage

(use 'multicall.core)
(defmulticall add (fn [x _] x))
(defcall add with-inc 1 [_ y] (inc y))
(defcall add with-plus 1 [_ y] (+ 1 y))
(add 1 2)
=> (3 3)

(defmulticall kind identity)
(defcall kind :food/olive [_] :fruit)
(defcall kind :fruit/* [_] :fruit)
(kind :food/olive)
=> (:fruit)
(kind :fruit/apple)
=> (:fruit)

Please refer to the unit tests for more examples.

Limitations in comparison with multimethods

Hierarchies are not supported.

Registered call inspection/removal can be done manually by accessing the registry atom but no functions are provided.

The default case always is a no-op.

License

Copyright © 2019 Paweł Stroiński

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.