On Fri, Mar 25, 2011 at 11:48 PM, James Reeves <[email protected]>wrote:
>
> (defprotocol Identifiable
> (id [self] "Return an object's unique id"))
>
> (deftype DBRef [db-id data]
> Identifiable
> (id [_] db-id)
> clojure.lang.IDeref
> (deref [_] data))
>
> (defn db-ref [id data]
> (DBRef. id data))
>
> Then we can get information about the reference, and deref it to get
> its contents:
>
> (def user
> (db-ref 193 {:login "fred"}))
>
> => (id user)
> 193
> => @user
> {:login fred}
Wow, this is incredibly cool!
I guess I just saw Ref's as a really special case, this shows how easy it is
to make one, and extend it! :)
Ambrose
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