Generic enum using case class in scala

Question

I have created the following enum objects

sealed trait MsgMapping[T] {def mycode: T;}

object Type1 {

  sealed trait msg[Int] extends MsgMapping[Int]

  case object A extends msg[Int]{val myCode = 0;}
  case object B extends msg[Int]{val myCode = 1;}

}

 object Type2 {

  sealed trait msgtype[String] extends MsgMapping[String]

  case object C extends msgtype[String]{val myCode = "xyz";}
  case object D extends msgtype[String]{val myCode = "def";}
 }

I want to create a generic case class that can except any type of MessageMapping ,it can be an Integer/String or any data type

But this line gives error as it expects the type.

           case class EumType(valueType: MsgMapping [T])

The below works

 case class EumType1(valueType: MsgMapping [Int])
 case class EumType2(valueType: MsgMapping [String])
 case class TestEnum(value:EumType1)
 case class Test(val:TestEnum)

But I do not want to create EumType1 and EumType2 .Can anyone help to me to create a generic code for this

Update

As per suggestion

 case class EnumType[T](valueType: MsgMapping[T])

 case class TestEnum(value:EnumType[T]) 

 It will throw compile error since it expects type 
 here but i want to pass the type on this line   
 case class Test(val:TestEnum) ,whether it is Type1 /Type2

What if you just add the type parameter, case class EnumType[T](valueType: MessageMapping[T]) ? — slouc
@cchantep.nice link .Any suggestion if I want to do it without enumeratum — coder25

Alvaro Carrasco Alvaro Carrasco · Accepted Answer · 2017-08-10T02:02:04

0

votes

Try using an existential type:

case class EumType(valueType: MessageMapping [_])

Generic enum using case class in scala

1 Answers