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gakuzzzz/gist:2426126

Created April 20, 2012 04:59
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scala の ConcurrentMap と withDefault
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gistfile1.scala
scala> import scala.collection._
import scala.collection._
scala> import scala.collection.JavaConverters._
import scala.collection.JavaConverters._
scala> val m: mutable.ConcurrentMap[Int, Int] = new java.util.concurrent.ConcurrentHashMap().asScala
m: scala.collection.mutable.ConcurrentMap[Int,Int] = Map()
scala> val m2 = m.withDefault(2*)
m2: scala.collection.mutable.Map[Int,Int] = Map()
scala> m2.get(4)
res0: Option[Int] = None
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get が default 使わないだけだった。
https://github.com/scala/scala/blob/master/src/library/scala/collection/Map.scala#L50

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