scala - 如何使 "this"隐式？

Question

我有一个类实例，应该在此类的方法中隐式传递该实例。像这样:

class Game(player: Player) {
  protected implicit val implicitThis = this // This is the workaround I use now

  def play = player.makeMove() // makeMove takes an implicit game: Game
}

Answer 1

你可以把它打包成一个trait。

trait ImplicitMe {
  protected implicit def implicitMe: this.type = this
}

class Game extends ImplicitMe {
  private def foo(implicit g: Game) = g
  def bar = foo
}

(可能还想在特征上添加 @inline。)