ParMap方法替代方法
问题描述:
ParMap(在Scala 2.9中)似乎没有.values方法。为什么会这样,如果我特别热衷于维护并行处理链,如何能够解决这个问题?ParMap方法替代方法
myParSeq.collect{case i: Interesting => i}.groupBy(_.content).values. ...
答
显然是疏忽。
Adding the missing ParMap and GenMap methods.
$ scala
Welcome to Scala version 2.10.0-RC2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_06).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import collection.parallel.immutable._
import collection.parallel.immutable._
scala> ParMap("a"->1)
res0: scala.collection.parallel.immutable.ParMap[String,Int] = ParMap(a -> 1)
scala> res0.values
res1: scala.collection.parallel.ParIterable[Int] = ParIterable(1)
如何:
$ scala29
Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_22).
Type in expressions to have them evaluated.
Type :help for more information.
scala> Map("a"->1, "b"->2).par
res0: scala.collection.parallel.immutable.ParMap[java.lang.String,Int] = ParMap(a -> 1, b -> 2)
scala> .unzip._2
res1: scala.collection.parallel.immutable.ParIterable[Int] = ParVector(1, 2)
你为什么不能代替'.values'用'.MAP(_._ 2)'? –
虽然没有,会做。只是感到惊讶,它不在那里。 – Pengin