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simplify typeclass

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This commit is contained in:
jilen 2024-12-29 20:19:07 +08:00
parent 7f5092c396
commit 47cf808e8f
1 changed files with 10 additions and 11 deletions
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21
src/main/scala/minisql/util/Show.scala
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@ -1,21 +1,20 @@
package minisql.util package minisql.util
object Show { trait Show[T] {
trait Show[T] { extension (v: T) {
def show(v: T): String def show: String
} }
}
object Show { object Show {
def apply[T](f: T => String) = new Show[T] {
def show(v: T) = f(v) def apply[T](f: T => String) = new Show[T] {
extension (v: T) {
def show: String = f(v)
} }
} }
implicit class Shower[T](v: T)(implicit shower: Show[T]) { given listShow[T](using shower: Show[T]): Show[List[T]] =
def show = shower.show(v)
}
implicit def listShow[T](implicit shower: Show[T]): Show[List[T]] =
Show[List[T]] { Show[List[T]] {
case list => list.map(_.show).mkString(", ") case list => list.map(_.show).mkString(", ")
} }