Coincidentally, I just found this in
clojure/core/protocols.clj<https://github.com/clojure/clojure/blob/master/src/clj/clojure/core/protocols.clj>
(not
that this is necessarily the best way to do this):
(def arr-impl
'(internal-reduce
[a-seq f val]
(let [arr (.array a-seq)]
(loop [i (.index a-seq)
val val]
(if (< i (alength arr))
(let [ret (f val (aget arr i))]
(if (reduced? ret)
@ret
(recur (inc i) ret)))
val)))))
(defn- emit-array-impls*
[syms]
(apply
concat
(map
(fn [s]
[(symbol (str "clojure.lang.ArraySeq$ArraySeq_" s))
arr-impl])
syms)))
(defmacro emit-array-impls
[& syms]
`(extend-protocol InternalReduce
~@(emit-array-impls* syms)))
(emit-array-impls int long float double byte char boolean)
On Saturday, February 23, 2013 4:03:02 AM UTC-8, Jim foo.bar wrote:
>
> I seem to be unable to quote a form and then repeatedly pass it inside
> the extend-protocol macro...something like this:
>
> (def ^:private co-stub
> '(run [this ^String text]
> (let [ann (edu.stanford.nlp.pipeline.Annotation. text)]
> (.annotate this ann) ann)))
>
>
> (extend-protocol IComponent
> edu.stanford.nlp.pipeline.POSTaggerAnnotator co-stub
> edu.stanford.nlp.pipeline.PTBTokenizerAnnotator co-stub
> edu.stanford.nlp.pipeline.WordsToSentencesAnnotator co-stub
> edu.stanford.nlp.pipeline.CleanXmlAnnotator co-stub
> edu.stanford.nlp.pipeline.MorphaAnnotator co-stub
> edu.stanford.nlp.pipeline.NERCombinerAnnotator co-stub
> edu.stanford.nlp.pipeline.RegexNERAnnotator co-stub
> edu.stanford.nlp.pipeline.TrueCaseAnnotator co-stub
> edu.stanford.nlp.pipeline.ParserAnnotator co-stub
> edu.stanford.nlp.pipeline.DeterministicCorefAnnotator co-stub
> )
>
> neither quoted version nor the back-quoted version work...The former
> throws :
> ClassCastException clojure.lang.PersistentList cannot be cast to
> java.lang.Class clojure.core/implements? (core_deftype.clj:512)
>
> and the latter throws:
>
> ClassCastException clojure.lang.Cons cannot be cast to java.lang.Class
> clojure.core/implements? (core_deftype.clj:512)
>
> any macro-gurus around?
>
> Jim
>
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