type_class_sample.scala

trait Util {
  trait AttributeResolver[T] {
    def get(): T
  }

  implicit object StringResolver extends AttributeResolver[String] {
    def get(): String = "Alpha"
  }
  implicit object IntResolver extends AttributeResolver[Int] {
    def get(): Int = 47
  }

  def get[T]()(implicit resolver: AttributeResolver[T]): T = resolver.get()
  // alternatively:
  //def get[T: AttributeResolver](): T = implicitly[AttributeResolver[T]].get()
}


object Foo extends Util {

  def main (args: Array[String]) {
    val x: String = get()
    //val x: Int = get()
    //val x: Double = get()
    println(x)
  }
}