CODEWITHSUNDEEP
scalatraitsselfcase-class
kboom
kboom

Reputation: 2339

Scala self not recognized from case class inside a Trait

Why self symbol is not recognized in here? I'm using Scala 2.12.

trait Parsers[ParseError, Parser[+_]] {

  def or[A](s1: Parser[A], s2: Parser[A]): Parser[A]

  case class ParserOps[A](p: Parser[A]) {
    def |[B>:A](p2: Parser[B]): Parser[B] = self.or(p,p2)
    def or[B>:A](p2: => Parser[B]): Parser[B] = self.or(p,p2)
  }

}

Upvotes: 0

Views: 166

Answers (1)

Ankur
Ankur

Reputation: 33637

You haven't defined self. Define it and it will work.

trait Parsers[ParseError, Parser[+_]] { self => 

  def or[A](s1: Parser[A], s2: Parser[A]): Parser[A]

  case class ParserOps[A](p: Parser[A]) {
    def |[B>:A](p2: Parser[B]): Parser[B] = self.or(p,p2)
    def or[B>:A](p2: => Parser[B]): Parser[B] = self.or(p,p2)
  }

}

Upvotes: 5

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