On 30/08/14 05:15, Atamert Ölçgen wrote:
Obviously I can't.
But I need to add this capability to an object. During testing I
attach meta to this object that contains an atom. Then I pass this
object to other functions, known in runtime. I can't use a dynamic var
because all this happens within a mock function that may be retried
and run in different threads.
In my case I used a list, e.g. (list obj), and used destructuring on the
other side when needed, e.g. [obj :as wobj].
I have seen this:
http://stackoverflow.com/questions/20724219/simplest-possible-clojure-object-that-can-accept-a-primitive-and-metadata
but can't deref it since I can't change the functions that will use it
later. If I wrap this object I need to be able to delegate all of its
functionality to the original object.
I don't think there's a quick solution without changing the contract.
Whatever solution is chosen you need to keep in mind how this will
affect things like equality, hashing, and instanceof?
Perhaps these links could be a start:
https://groups.google.com/forum/#!topic/clojure/9zCGdW_Q7o8
<https://groups.google.com/forum/#%21topic/clojure/9zCGdW_Q7o8>
http://stackoverflow.com/questions/9086926/create-a-proxy-for-an-specific-instance-of-an-object-in-clojure
Also, if the meta data is just for you own use, then you might want to
store it yourself in a map with weak references, or just use WeakHashMap
<http://docs.oracle.com/javase/7/docs/api/java/util/WeakHashMap.html>
directly. But then you'll be stateful...
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