On Apr 29, 5:58 pm, Stu Hood <stuh...@gmail.com> wrote:
> Instead of attaching the metadata directly to the object, what if the
> metadata was stored outside the object, in a global map of {object metadata,
> ...}? In order to handle garbage collection, something similar to Java's
> WeakHashMap could be used, with the object itself as the key.
Interesting idea.
There might be performance penalities, depending on how often metadata
is used. Metadata guarantees atomic updates (alter-meta!) so the
WeakHashMap might need to be wrapped in a synchronized map, at a
further penalty.
I've never needed metadata on non-Clojure types. Do you have a use in
mind?
This could be a library, too, sort of like:
(defn my-meta [object]
(if (instance? clojure.lang.IMeta object)
(meta object)
(*global-metadata* object)))
-SS
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