Scala Tuple10 隐式排序不起作用

Question

我可以让比较方法工作到 Tuple9，如下所示：

  import scala.math.Ordered.orderingToOrdered
  (1,2,"ab",4,5,6.0,7l,"de",1.0) compare (1,2,"ab",4,5,6.0,7l,"de",1.0)

但是使用 Tuple10 我得到编译错误：

  import scala.math.Ordered.orderingToOrdered
  (1,2,"ab",4,5,6.0,7l,"de",1.0,2) compare (1,2,"ab",4,5,6.0,7l,"de",1.0,2) // >> compile error: value compare is not a member of (Int, Int, String, Int, Int, Double, Long, String, Double, Int)

我尝试了另一种方法，但这也给出了隐含的错误：

implicitly[Ordering[Tuple10[Int, Int, String, Int, Int, Double, Long, String, Double, Double]]].compare((1,2,"ab",4,5,6.0,7l,"de",1.0,4), (1,2,"ab",4,5,6.0,7l,"de",1.0,4)) 

compiler error:
No implicit Ordering defined for (Int, Int, String, Int, Int, Double, Long, String, Double, Double).
not enough arguments for method implicitly: (implicit e: Ordering[(Int, Int, String, Int, Int, Double, Long, String, Double, Double)])Ordering[(Int, Int, String, Int, Int, Double, Long, String, Double, Double)]. Unspecified value parameter e.

看起来 Ordering 仅在 Tuple9 之前定义。如果我错了，请纠正我。

Answer 1

从source code 可以看出，你是对的，它只适用于 Tuple9。但是在您看到每次迭代中的模式之后，您应该能够根据需要复制和扩展它。