TypeTag和比较运算符？

Question

I don't really understand why you can't work with a TypeTag object itself, can someone explain why the below code doesn't work? I'm also asking why the TypeTag object doesn't directly support operators like =:= . I know this has something to do with the typeOf[T] function, but frustratingly I can't seem to grab this directly either (example myTT.typeOf )

Thanks

import scala.reflect.runtime.universe._

object TestRun extends App {

  class Matcher[T:TypeTag] {
    def test[U](x: U)(implicit tag: TypeTag[U]) = {
      val myTT = implicitly[TypeTag[T]]

      println("=:=" + myTT =:= tag) //error
    }
  }
}

Answer 1

You need the tpe method:

println("=:=" + (myTT.tpe =:= tag.tpe))

(You also need another set of parentheses because of the left-associativity of + )