On 28 January 2010 23:30, Timothy Pratley <[email protected]> wrote:
> 2010/1/29 Michael Wood <[email protected]>:
>>> (doseq [d data-seq]
>>>  (.submit clojure.lang.Agent/pooledExecutor (cast Callable #(foo d))))
>>
>> What's the purpose of the cast here?
>>
>> #(...) is an fn, which is Callable by definition, isn't it?  So
>> wouldn't that line be equivalent to:
>> (.submit clojure.lang.Agent/pooledExecutor #(foo d)))
>
> Yes and no... submit is overloaded on Callable and Runnable and #(foo
> d) implements both.
> user=> (.submit clojure.lang.Agent/pooledExecutor #(inc 1))
> java.lang.IllegalArgumentException: More than one matching method found: 
> submit
>
> The cast was just a quick hack to make the example work.

Ah, OK.  Thanks for the explanation.

-- 
Michael Wood <[email protected]>

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