Hi François,

Thanks for the links.

I can't really pass a list since the first function is expecting the object
I am passing, then it calls some other functions that were supposed to
extract the meta. The problem is, functions that are called later can be
executed in a different thread.



On Sat, Aug 30, 2014 at 4:29 PM, François Rey <fmj...@gmail.com> wrote:

>  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
>
> 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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-- 
Kind Regards,
Atamert Ölçgen

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