scodec-stackoverflow.scala

package ex

import scodec.{Codec, codecs}
import scodec.codecs.{Discriminated, uint8}

object ASD extends App {
  
  sealed trait Expr
  case class INT(i: Int)             extends Expr
  case class SUM(i1: Expr, i2: Expr) extends Expr

  import codecs.implicits._

  implicit def d    = Discriminated[Expr, Int](uint8)
  implicit def dInt = d.bind[INT](0)
  implicit def dSum = d.bind[SUM](1)

  val codec = Codec[Expr]

  val term = (1 to 100000).foldLeft[Expr](INT(0))((acc, _) => SUM(acc, INT(1)))
  codec.encode(term)
}