Question

我正在使用带有Scala插件的JetBrains IntelliJ IDEA，我在main/scala/myparallel目录中有一个package.scala文件，其中包含以下代码：

package myparallel

import java.util.concurrent._
import scala.util.DynamicVariable

object primitives {

  def time[R](block: => R): R = {
    val t0 = System.nanoTime()
    val result = block    // call-by-name
    val t1 = System.nanoTime()
    println("Elapsed time: " + (t1 - t0)/1000000 + "ms")
    result
  }

  val forkJoinPool = new ForkJoinPool

  abstract class TaskScheduler {
    def schedule[T](body: => T): ForkJoinTask[T]
    def parallel[A, B](taskA: => A, taskB: => B): (A, B) = {
      val right = task {
        taskB
      }
      val left = taskA
      (left, right.join())
    }
  }

  class DefaultTaskScheduler extends TaskScheduler {
    def schedule[T](body: => T): ForkJoinTask[T] = {
      val t = new RecursiveTask[T] {
        def compute = body
      }
      forkJoinPool.execute(t)
      t
    }
  }

  val scheduler =
    new DynamicVariable[TaskScheduler](new DefaultTaskScheduler)

  def task[T](body: => T): ForkJoinTask[T] = {
    scheduler.value.schedule(body)
  }

  def parallel[A, B](taskA: => A, taskB: => B): (A, B) = {
    scheduler.value.parallel(taskA, taskB)
  }

  def parallel[A, B, C, D](taskA: => A, taskB: => B, taskC: => C, taskD: => D): (A, B, C, D) = {
    val ta = task { taskA }
    val tb = task { taskB }
    val tc = task { taskC }
    val td = taskD
    (ta.join(), tb.join(), tc.join(), td)
  }

}

我通过将import myparallel.primitives._导入此代码，在各种.sc工作表文件中使用此代码，例如以下示例：

import myparallel.primitives._
import scala.util.Random

val threshold = 10000

def mapArrPar[A,B](inp: Array[A], left: Int, right: Int,
                   f : A => B, out: Array[B]): Unit = {
  if (right - left < threshold)
    mapArr(inp, left, right, f, out)
  else {
    val mid = left + (right - left)/2
    parallel(mapArrPar(inp, left, mid, f, out),
      mapArrPar(inp, mid, right, f, out))
  }
}

val vectIn = Array.fill(100000)(1).map(_ * scala.util.Random.nextInt)
val vectOut = new Array[Double](100000)

time(mapArrPar(vectIn, 0, vectIn.length, (x:Int) => Math.pow(x, 19), vectOut))

lint不会给我任何错误，但是如果我尝试执行工作表，则会遇到一系列错误，第一个错误是Error:not found: value myparallel import myparallel.primitives._。此外，每次使用前面提到的程序包中定义的功能都存在其他错误，例如Error:(51, 6) not found: value parallel parallel(mapArrPar(inp, left, mid, f, out),

包或导入语句有什么问题？

导入语句中出现“错误：未找到：值myparallel”

0 个答案: