Scala 中的预期定义错误开始 [英] Expected start of definition error in Scala

问题描述

我正在尝试运行 this math.stackexchange post(请参阅第二个答案)，但似乎在以 implicit def....编译器告诉我 error: expected start of definition.

I'm trying to run the Scala code presented in this math.stackexchange post (please see the second answer), but seem to be running into issues in the line starting with implicit def.... The compiler is telling me error: expected start of definition.

有什么想法吗?谢谢！

我应该补充一点，我正在使用 http://www.tutorialspoint.com/compile_scala_online.php 运行我的代码.

I should add that I'm using http://www.tutorialspoint.com/compile_scala_online.php to run my code.

推荐答案

刚刚在 Scala REPL 上尝试了您的示例，它按预期对我有用.

Just tried your example on Scala REPL and it works for me as expected.

将 implicit def 移动到一个对象:

Move the implicit def to an object:

object MyImplicits {
  /** Pimp `Set[X]` with a few convenient operators */
  implicit def logicalSetOps[X](set: Set[X]) = new {
    def and(other: Set[X]) = set.intersect(other)
    def or(other: Set[X]) = set.union(other)
    def minus(other: Set[X]) = set.filterNot(other.contains)
  }
}

然后做:

import MyImplicits._

这应该对你有用.

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