值类引入不需要的公共方法 [英] Value classes introduce unwanted public methods

问题描述

查看我的库的一些 Scala 文档，在我看来，值类存在一些不需要的噪音.例如:

Looking at some scala-docs of my libraries, it appeared to me that there is some unwanted noise from value classes. For example:

implicit class RichInt(val i: Int) extends AnyVal {
  def squared = i * i
}

这引入了一个不需要的符号i:

This introduces an unwanted symbol i:

4.i   // arghh....

这些东西出现在 scala 文档和 IDE 自动完成中，这真的很糟糕.

That stuff appears both in the scala docs and in the IDE auto completion which is really not good.

那么...关于如何缓解这个问题的任何想法?我的意思是你可以使用 RichInt(val self: Int) 但这并没有让它变得更好(4.self，wth?)

So... any ideas of how to mitigate this problem? I mean you can use RichInt(val self: Int) but that doesn't make it any better (4.self, wth?)

编辑:

在下面的例子中，编译器是否擦除了中间对象?

In the following example, does the compiler erase the intermediate object, or not?

import language.implicitConversions

object Definition {
  trait IntOps extends Any { def squared: Int }
  implicit private class IntOpsImpl(val i: Int) extends AnyVal with IntOps {
    def squared = i * i
  }
  implicit def IntOps(i: Int): IntOps = new IntOpsImpl(i)  // optimised or not?
}

object Application {
  import Definition._
  // 4.i  -- forbidden
  4.squared
}

推荐答案

在 Scala 2.11 中，您可以将 val 设为私有，从而解决此问题:

In Scala 2.11 you can make the val private, which fixes this issue:

implicit class RichInt(private val i: Int) extends AnyVal {
  def squared = i * i
}

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