Hi,
maybe this gives you a hint, one why it happens:
user=> (let [k :xyz] (macroexpand-1 '(swizzle* Vec3 v k {})))
(new Vec3 (. v k) {})
The problem is that swizzle* is a macro. It has no access to runtime
information! It sees only the symbol not its value. Calling it with a
literal keyword works, thusly. You could hardwire some functions in case
the number of coordinates is always three:
(defmacro defswizzlers
[]
(let [v (gensym "v")]
`(do ~@(for [x "xyz"
y "xyz"
z "xyz"]
`(defn ~(symbol (str x y z))
[~(with-meta v {:tag `Vec3})]
(Vec3. ~@(map (fn [s] `(. ~v ~(symbol (str s)))) [x y z])
(meta ~v)))))))
(defswizzlers)
Then you can simply call like (zyx v) instead of (:zyx v).
But all that is very, very static.
Kind regards
Meikel
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