Thanks for the advice, Timothy. I think this is probably much cleaner than
where I ended up, and good advice. I'll let you know how it goes.
On Fri, Apr 24, 2015 at 10:45 AM, Timothy Baldridge <tbaldri...@gmail.com>
wrote:
> This is a situation where I reach for eval. Construct your reify call as
> if you were inside a macro, but instead of returning data from the macro,
> call (eval form). The call to reify will be slow (and could cause permgen
> problems), but if you wrap the form in a function you can cache the
> function and avoid that problem. Something like:
>
>
> (let [cache (atom {})]
> (defn implement-at-runtime [interface-name method-name & body]
> (if-let [result (@cache [interface-name method-name body])]
> (result)
> (let [f (eval `(fn []
> (reify
> ~interface-name
> (~method-name ~@body))))]
> (swap! cache assoc [interface-name method-name body] f)
> (f)))))
>
> @(implement-at-runtime 'clojure.lang.IDeref 'deref '[this] 42)
> ;; returns 42
>
> Timothy
>
> On Fri, Apr 24, 2015 at 8:14 AM, Steven Deobald <ste...@nilenso.com>
> wrote:
>
>> Okay, Brian. I'll bite. :)
>>
>> I don't have the answer for you, but I'm definitely curious what your use
>> case is. Whatcha upto?
>>
>> Steven Deobald -- ⌀ -- nilenso.com
>>
>> On Fri, Apr 24, 2015 at 7:18 PM, Brian Guthrie <btguth...@gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> Is there a good way to reify protocols programmatically, i.e., by
>>> passing data structures rather than dropping down into a macro? reify
>>> bottoms out in reify*, which doesn't help much.
>>>
>>> Thanks,
>>>
>>> Brian
>>>
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>
>
>
> --
> “One of the main causes of the fall of the Roman Empire was that–lacking
> zero–they had no way to indicate successful termination of their C
> programs.”
> (Robert Firth)
>
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