Generic function with type bounds

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I am trying to write a generic function which takes a generic container that implements "++", however I can't seem to get the syntax right.

def pagedRequest[A, C[_] <: Iterable](url: String, accumulator: C[A])(parser: (WSResponse) => C[A]): Future[Either[Result, C[A]]] = {
  WS.url(url).get().flatMap { response =>
    response.status match {
      case OK =>
        val data = accumulator ++ parser(response)

        (response.json \ "paging" \ "next").asOpt[String] match {
          case None => Future.successful(Right(data))
          case Some(next) => pagedRequest(next, data)(parser)
        }

      case _ =>
        Future.successful(Left(ProxiedResult(response)))
    }
  }
}

The type of "data" keeps being Iterable[A], instead of C[A].

asked 37 secs ago

Jeff

10

Generic function with type bounds