“私有[语法]"在斯卡拉 [英] "private[syntax]" in Scala

问题描述

这个私有[语法]"语言特性是什么?

What is this "private[syntax]" language feature?

/** Wraps a value `self` and provides methods related to `Show` */
final class ShowOps[F] private[syntax](val self: F)(implicit val F: Show[F]) extends Ops[F] {
  ////
  final def show: Cord = F.show(self)
  final def shows: String = F.shows(self)
  final def print: Unit = Console.print(shows)
  final def println: Unit = Console.println(shows)
  ////
}

^ 位置:scalaz-series-7.3.x/core/src/main/scala/scalaz/syntax/ShowSyntax.scala

^ Location: scalaz-series-7.3.x/core/src/main/scala/scalaz/syntax/ShowSyntax.scala

推荐答案

private[packageX] 表示以下方法/类/对象/构造函数只能从该包内访问 - 在这种情况下 syntax 是包名，这个构造函数只能从 syntax 包内的其他代码访问.

private[packageX] means the following method/class/object/constructor is accessible only from within that package - in this case syntax is the package name, and this constructor is only accessible from other code inside syntax package.

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