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post.scala

object Show {

  def apply[A](implicit sh: Show[A]): Show[A] = sh

  object ops {
    def show[A: Show](a: A) = Show[A].show(a)

    implicit class ShowOps[A: Show](a: A) {
      def show = Show[A].show(a)
    }
  }

  implicit val intCanShow: Show[Int] =
    int => s"int $int"

  implicit val stringCanShow: Show[String] =
    str => s"string $str"

}