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• ZipStream.scala

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cats.data.ZipStream.scala Maven / Gradle / Ivy

package cats
package data

class ZipStream[A](val value: Stream[A]) extends AnyVal

object ZipStream {

  def apply[A](value: Stream[A]): ZipStream[A] = new ZipStream(value)

  implicit val catsDataAlternativeForZipStream: Alternative[ZipStream] with CommutativeApplicative[ZipStream] =
    new Alternative[ZipStream] with CommutativeApplicative[ZipStream] {
      def pure[A](x: A): ZipStream[A] = new ZipStream(Stream.continually(x))

      override def map[A, B](fa: ZipStream[A])(f: (A) => B): ZipStream[B] =
        ZipStream(fa.value.map(f))

      def ap[A, B](ff: ZipStream[A => B])(fa: ZipStream[A]): ZipStream[B] =
        ZipStream((ff.value, fa.value).zipped.map(_.apply(_)))

      override def product[A, B](fa: ZipStream[A], fb: ZipStream[B]): ZipStream[(A, B)] =
        ZipStream(fa.value.zip(fb.value))

      def empty[A]: ZipStream[A] = ZipStream(Stream.empty[A])

      def combineK[A](x: ZipStream[A], y: ZipStream[A]): ZipStream[A] =
        ZipStream(cats.instances.stream.catsStdInstancesForStream.combineK(x.value, y.value))
    }

  implicit def catsDataEqForZipStream[A: Eq]: Eq[ZipStream[A]] =
    Eq.by((_: ZipStream[A]).value)(cats.kernel.instances.stream.catsKernelStdEqForStream[A])
}