t0218.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 13 行

trait APQ {  
  class Placement {
  }

  type P <: Placement

  type PP = P

  def pq(numQueens: int, numRows: int) : List[Placement] = {
    List(new PP) 
  }
}