通过砖墙驱动单件类型
这是一个非常简洁的版本：
case class Brickwall[A](otherSide: A)
trait Monoman { def me(m: this.type): Unit }
def test(m: Monoman): Unit = m.me(Brickwall(m).otherSide)
-> error: type mismatch;
found : Monoman
required: m.type
没有找到相关结果
已邀请:
3 个回复
膛嵌墒缅欠
def test( m: Monoman ) { m.me( Brickwall[m.type]( m ).otherSide )}谷靛
trait Monoman { def me( m: this.type ) : Unit def createWall = Brickwall[this.type](this) } def test( m: Monoman ) { m.me(m.createWall.otherSide) }稳赣苍卯改
object Brickwall case class Brickwall[A](brick: A) trait Monoman { var wall: Ref[this.type, Brickwall[String]] def ref[V](v: V): Ref[this.type, V] } object Ref { implicit def unwrap[Repr](r: Ref[_, Repr]): Repr = r.repr implicit def wrap[A, Repr](repr: Repr): Ref[A, Repr] = new Impl[A, Repr](repr) private class Impl[A, Repr](val repr: Repr) extends Ref[A, Repr] } trait Ref[A, Repr] { def repr: Repr } def test(m: Monoman): Unit = { val w0 = m.wall val w1 = w0.copy(brick = "3.1415") m.wall = w1 // doesn't convert to Ref }永远不会被推断。