Created
February 8, 2018 10:19
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trait Eq[A] { | |
val eq: String | |
} | |
trait Ord[A] { | |
val ord: String | |
} | |
implicit val eqInt: Eq[Int] | |
= new Eq[Int] { val eq = "eqInt"} | |
implicit val ordInt: Ord[Int] | |
= new Ord[Int] { val ord = "ordInt" } | |
implicit val eqString: Eq[String] | |
= new Eq[String] { val eq = "eqString" } | |
trait Sortable[A] { | |
def sortMe(l: List[A]): String | |
} | |
trait LowPrio { | |
implicit def sortEq[A](implicit ev: Eq[A]): Sortable[A] | |
= new Sortable[A] { | |
def sortMe(l: List[A]) = "sorted using " + ev.eq | |
} | |
} | |
object HighPrio extends LowPrio { | |
implicit def sortOrd[A](implicit ev: Ord[A]): Sortable[A] | |
= new Sortable[A] { | |
def sortMe(l: List[A]) = "sorted using " + ev.ord | |
} | |
} | |
import HighPrio._ | |
def sort[A](l: List[A])(implicit ev: Sortable[A]): String | |
= ev.sortMe(l) | |
println(sort(List(1,2,3))) | |
// sorted using ordInt | |
println(sort(List("a","b","c"))) | |
// sorted using eqString |
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