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CommutativeApplicative.scala
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CommutativeApplicative.scala
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/*
* Copyright (c) 2015 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package cats
import cats.kernel.CommutativeMonoid
/**
* Commutative Applicative.
*
* Further than an Applicative, which just allows composition of independent effectful functions,
* in a Commutative Applicative those functions can be composed in any order, which guarantees
* that their effects do not interfere.
*
* Must obey the laws defined in cats.laws.CommutativeApplicativeLaws.
*/
trait CommutativeApplicative[F[_]] extends Applicative[F] with CommutativeApply[F]
object CommutativeApplicative {
def commutativeMonoidFor[F[_]: CommutativeApplicative, A: CommutativeMonoid]: CommutativeMonoid[F[A]] =
new CommutativeMonoid[F[A]] {
override def empty: F[A] =
CommutativeApplicative[F]
.pure(CommutativeMonoid[A].empty)
override def combine(x: F[A], y: F[A]): F[A] =
CommutativeApplicative[F]
.map2(x, y)(CommutativeMonoid[A].combine)
}
/**
* Summon an instance of [[CommutativeApplicative]] for `F`.
*/
@inline def apply[F[_]](implicit instance: CommutativeApplicative[F]): CommutativeApplicative[F] = instance
@deprecated("Use cats.syntax object imports", "2.2.0")
object ops {
implicit def toAllCommutativeApplicativeOps[F[_], A](
target: F[A]
)(implicit tc: CommutativeApplicative[F]): AllOps[F, A] {
type TypeClassType = CommutativeApplicative[F]
} =
new AllOps[F, A] {
type TypeClassType = CommutativeApplicative[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
trait Ops[F[_], A] extends Serializable {
type TypeClassType <: CommutativeApplicative[F]
def self: F[A]
val typeClassInstance: TypeClassType
}
trait AllOps[F[_], A] extends Ops[F, A] with Applicative.AllOps[F, A] with CommutativeApply.AllOps[F, A] {
type TypeClassType <: CommutativeApplicative[F]
}
trait ToCommutativeApplicativeOps extends Serializable {
implicit def toCommutativeApplicativeOps[F[_], A](target: F[A])(implicit tc: CommutativeApplicative[F]): Ops[F, A] {
type TypeClassType = CommutativeApplicative[F]
} =
new Ops[F, A] {
type TypeClassType = CommutativeApplicative[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
@deprecated("Use cats.syntax object imports", "2.2.0")
object nonInheritedOps extends ToCommutativeApplicativeOps
}