bluenote10

import os, threadpool

proc spawnBackgroundJob[T](f: iterator (): int): TChannel[T] =

  type Args = tuple[iter: iterator (): T, channel: ptr TChannel[T]]
  #type Args = tuple
  #  iter: iterator (): T
  #  channel: ptr TChannel[T]

  proc threadFunc(args: Args) {.thread.} =

bluenote10

trait CrossProduct[A,B,C] {
  def cross( as: Traversable[A], bs: Traversable[B] ): Traversable[C]
}

trait LowPriorityCrossProductImplicits {
  private type TV[X] = Traversable[X]

  implicit def crosser2[A,B] = new CrossProduct[A,B,(A,B)] {
    def cross( as: TV[A], bs: TV[B] ): TV[(A,B)] = for { a <- as; b <- bs } yield (a, b)
  }