Hi,
since IFn is a Java interface and not a protocol, I'm afraid there is no
better way to define this. However I would write the macro slightly
differently. I find this more approachable. YMMV.
(def max-arities 20)
(defmacro definvokable
[type fields & deftype-tail]
(let [f (fields 0)
args (repeatedly max-arities gensym)
arity (fn [n]
(let [args (take n args)]
`(invoke [this# ~@args] ((. this# ~f) ~@args))))
vararg `(invoke [this# ~@args more#]
(apply (. this# ~f) ~@args more#))
apply-to `(applyTo [this# args#] (apply (. this# ~f) args#))]
`(deftype ~type
~fields
clojure.lang.IFn
~@(map arity (range (inc max-arities)))
~vararg
~apply-to
~@deftype-tail)))
Sincerely
Meikel
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