我希望有一个sequence
的版本,它不对32个元素进行分块。当前,此代码将输出
(def peek #(doto % (print " ")))
(def pause #(do (Thread/sleep 10)
%))
(take 2 (->> (range 100)
(sequence (comp (map peek)
(map pause)
(map inc)))))
;; prints 0 1 2 3 4 <..etc..> 32
;; => (0, 1)
(take 2 (->> (range 100)
(iter-sequence (comp (map peek)
(map pause)
(map inc)))))
;; prints 0 1
;; => (0, 1)
有办法做到这一点吗?
我不得不改变一些东西来让它工作。第一个步骤是剪切和粘贴sequence
代码,并将clojure.lang.rt/chunkiteratorseq
替换为公开了公共构造函数方法的clojure.lang.iteratorseq的替代版本。
原因是clojure.lang.iteratorseq/create
对L27上的iter.next()
有一个检查,如果源代码阻塞,这个检查将阻塞。
(defn seqiter
{:added "1.0"
:static true}
([coll] coll)
([xform coll]
(IteratorSeq.
(TransformerIterator/create xform (clojure.lang.RT/iter coll))))
([xform coll & colls]
(IteratorSeq.
(TransformerIterator/createMulti
xform
(map #(clojure.lang.RT/iter %) (cons coll colls))))))
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