如何制作＆＃34;这个＆＃34;隐？

Question

我有一个类实例应该在这个类的方法中隐式传递。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

您可以将其打包成特质。

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

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

（可能还要在特质上添加@inline。）