xort.scala

import cats.data.XorT
import cats.std.future._

import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration.Duration
import scala.concurrent.{ Await, Future }

object XorDemo extends App {
  sealed trait Error

  def f1(): XorT[Future, Error, Int] = XorT.right[Future, Error, Int] {
    Future.successful(3)
  }

  def f2(): XorT[Future, Error, Int] = XorT.right[Future, Error, Int] {
    Future.successful(5)
  }

  def f3(): XorT[Future, Error, Int] = {
    for {
      x <- f1()
      y <- f2()
    } yield x + y
  }

  println(Await.result(f3().value, Duration.Inf))
}