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CoflatMap Instance for Applicative #2112

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Dec 16, 2017
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CoflatMap Instance for Applicative #2112

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7d42367
Add Function for CoflatMap for Applicative
ChristopherDavenport Dec 15, 2017
36b428a
Add Documentation for Applicative coflatMap usage
ChristopherDavenport Dec 15, 2017
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8 changes: 8 additions & 0 deletions core/src/main/scala/cats/Applicative.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -207,6 +207,14 @@ object Applicative {
*/
implicit def catsApplicativeForArrow[F[_, _], A](implicit F: Arrow[F]): Applicative[F[A, ?]] =
new ArrowApplicative[F, A](F)


def coflatMap[F[_]](implicit F: Applicative[F]): CoflatMap[F] =
new CoflatMap[F] {
def coflatMap[A, B](fa: F[A])(f: F[A] => B): F[B] = F.pure(f(fa))
def map[A, B](fa: F[A])(f: A => B): F[B] = F.map(fa)(f)
}

}

private[cats] class ApplicativeMonoid[F[_], A](f: Applicative[F], monoid: Monoid[A]) extends ApplySemigroup(f, monoid) with Monoid[F[A]] {
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13 changes: 13 additions & 0 deletions tests/src/test/scala/cats/tests/ApplicativeSuite.scala
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Expand Up @@ -2,6 +2,9 @@ package cats
package tests

import cats.Applicative
import cats.data.{Validated, Const}
import cats.laws.discipline.arbitrary._
import cats.laws.discipline.CoflatMapTests


class ApplicativeSuite extends CatsSuite {
Expand Down Expand Up @@ -36,4 +39,14 @@ class ApplicativeSuite extends CatsSuite {
}
}

implicit val listwrapperApplicative = ListWrapper.applicative
implicit val listwrapperCoflatMap = Applicative.coflatMap[ListWrapper]
checkAll("Applicative[ListWrapper].coflatMap", CoflatMapTests[ListWrapper].coflatMap[String, String, String])

implicit val validatedCoflatMap = Applicative.coflatMap[Validated[String, ?]]
checkAll("Applicative[Validated].coflatMap", CoflatMapTests[Validated[String, ?]].coflatMap[String, String, String])

implicit val constCoflatMap = Applicative.coflatMap[Const[String, ?]]
checkAll("Applicative[Const].coflatMap", CoflatMapTests[Const[String, ?]].coflatMap[String, String, String])

}