OK, so I happened to stumble across a fix to my program, but I still
wonder whether this is intentional behavior in 1.3 alpha1 or not.
If I change the name 'nbody' in these lines:
(let [^Body nbody other
dx (- x (.x nbody)) ; first reflection warning here
dy (- y (.y nbody)) ; second here
dz (- z (.z nbody)) ; third here
to some name that is not the name of the namespace, like 'nbo', then
the reflection warnings go away:
(let [^Body nbo other
dx (- x (.x nbo)) ; first reflection warning here
dy (- y (.y nbo)) ; second here
dz (- z (.z nbo)) ; third here
If I then change the ns declaration at the top to "ns nbo", the
reflection warnings come back again.
Easy to avoid the problem, once you know.
Andy
On Sep 27, 2010, at 1:58 PM, Andy Fingerhut wrote:
The following program compiles and runs perfectly fine in both 1.2
and 1.3 alpha1. It has no reflection warnings in 1.2, but it does
in 1.3 alpha1. I have tried several variations, but I haven't yet
been able to figure out how to write type declarations that avoid
reflection in 1.3 alpha1. Does anyone know whether this is a bug?
Or perhaps code like this ought to be structured completely
differently in order to avoid reflection, and it was just a fluke
that it worked in 1.2?
Thanks,
Andy
(ns nbody
(:gen-class))
(set! *warn-on-reflection* true)
(definterface IBody
(^double x [])
(^double y [])
(^double z [])
(^double dist [other]))
(deftype Body [^{:unsynchronized-mutable true :tag double} x
^{:unsynchronized-mutable true :tag double} y
^{:unsynchronized-mutable true :tag double} z ]
IBody
(x [this] x)
(y [this] y)
(z [this] z)
(dist [this other]
(let [^Body nbody other
dx (- x (.x nbody)) ; first reflection warning here
dy (- y (.y nbody)) ; second here
dz (- z (.z nbody)) ; third here
dsq (+ (* dx dx)
(+ (* dy dy)
(* dz dz)))]
(Math/sqrt dsq))))
(defn -main [& args]
(let [b (Body. 0 0 0)]
(println "pos:" (.x b) (.y b) (.z b))))
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