Consumer

Value Members

1. final def !=(arg0: Any): Boolean

   

   Definition Classes

   Any

2. final def ##(): Int

   

   Definition Classes

   Any

3. final def ==(arg0: Any): Boolean

   

   Definition Classes

   Any

4. final def asInstanceOf[T0]: T0

   

   Definition Classes

   Any

5. val consume: (A) ⇒ F[Unit]

   

6. def getClass(): Class[_ <: AnyVal]

   

   Definition Classes

   AnyVal → Any

7. final def isInstanceOf[T0]: Boolean

   

   Definition Classes

   Any

8. def runTell[B](f: (FunctorTell[F, A]) ⇒ B)(implicit F: Functor[F]): B

   

   Execute an operation that can "log" values of type A using this Consumer

   Execute an operation that can "log" values of type A using this Consumer

   N.B.: unlike most FunctorTell instances, this one does not require any constraints on A

   As an example, a simple async logger that only blocks if a previous message is still being processed, to ensure correct ordering:

   def greeter(name: String)(implicit ev: FunctorTell[IO, String]): IO[Unit] =
     ev.tell(s"Long time no see, $name") >> IO.sleep(1.second)
   
   def forever[A](ioa: IO[A]): IO[Nothing] = ioa >> forever(ioa)
   
   for {
      mVar <- MVar.empty[IO, String]
      logger = forever(mVar.take.flatMap(s => IO(println(s)))
      _ <- logger.start // Do logging in background
      _ <- Consumer(mVar.put).runTell { implicit tell =>
        forever(greeter("Oleg"))
      }
   } yield ()

9. def tellInstance(implicit F: Functor[F]): FunctorTell[F, A]

   

   Directly return an instance for FunctorTell that is based on this Consumer

   Directly return an instance for FunctorTell that is based on this Consumer

   Returned instance would call the Consumer function as its tell operation

   See also

   runTell for potentially more convenient usage

10. def toString(): String

    

    Definition Classes

    Any