Scala example source code file (ComonadStore.scala)

This example Scala source code file (ComonadStore.scala) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Scala by Example" ^TM.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

comonadstore, functor

The ComonadStore.scala Scala example source code

package scalaz

////
/**
 *
 */
////
trait ComonadStore[F[_], S] extends Comonad[F] { self =>
  ////
  def pos[A](w: F[A]): S
  def peek[A](s: S, w: F[A]): A

  def peeks[A](s: S => S, w: F[A]): A =
    peek(s(pos(w)), w)

  def seek[A](s: S, w: F[A]): F[A] =
    peek(s, cojoin(w))

  def seeks[A](s: S => S, w: F[A]): F[A] =
    peeks(s, cojoin(w))

  def experiment[G[_], A](s: S => G[S], w: F[A])(implicit FG: Functor[G]): G[A] =
    FG.map(s(pos(w)))(peek(_, w))
  ////

}

object ComonadStore {
  @inline def apply[F[_], S](implicit F: ComonadStore[F, S]): ComonadStore[F, S] = F

  ////

  ////
}