如何在一种情况下对每个数字类进行模式匹配? [英] How to pattern-match against every numeric class in one case?

问题描述

假设我有

def foo(x: Any) = x match {
  case s: String => println(0)
  case i: Int => println(1)
  case l: Long => println(2)
  //...
}

有没有什么办法可以制作如下内容?

Is there any way to make something like the following?

def foo(x: Any) = x match {
  case s: String => println(0)
  case i: Numeric => println("Numeric")
}

推荐答案

你可以匹配Number接口:

def foo(x: Any) = x match {
  case s: String => println(0)
  case i: java.lang.Number => println("Numeric")
}

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