On Wednesday, September 12, 2012 8:03:58 AM UTC-6, jarppe wrote:
>
> I have a function that generatwed unique ID's, something like this:
>
> (def k (atom 0))
> (defn generate-id [] (swap! k inc))
>
> and I try to use it like this:
>
> {(generate-id) "foo"
> (generate-id) "bar"}
>
> How ever, I get
>
> IllegalArgumentException Duplicate key: (generate-id)
> clojure.lang.PersistentArrayMap.createWithCheck (PersistentArrayMap.java:70)
>
> This works as expected.
>
> (let [id1 (generate-id)
> id2 (generate-id)]
> {id1 "foo" id2 "bar})
>
> Should I be able to call generate-id in map literal?
>
> --
> -jarppe
>
>
This also fails:
{ (gensym) "foo"
(gensym) "bar" }
>From the stack trace I get it looks like the reader macro that handles map
literals is only looking at the function call, not the result of the
function call. This makes sense as it is the reader, not the evaluator.
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