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LocalLaws.scala
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LocalLaws.scala
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/*
* Copyright 2021 Typelevel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cats
package mtl
package laws
import cats.laws.IsEq
import cats.laws.IsEqArrow
trait LocalLaws[F[_], E] extends AskLaws[F, E] {
implicit def localInstance: Local[F, E]
override implicit def applicative = localInstance.applicative
// external laws:
def askReflectsLocal(f: E => E): IsEq[F[E]] =
localInstance.local(localInstance.ask)(f) <-> applicative.map(localInstance.ask)(f)
def localPureIsPure[A](a: A, f: E => E): IsEq[F[A]] =
localInstance.local(applicative.pure(a))(f) <-> applicative.pure(a)
def localDistributesOverAp[A, B](fa: F[A], ff: F[A => B], f: E => E): IsEq[F[B]] =
localInstance.local(applicative.ap(ff)(fa))(f) <-> applicative.ap(
localInstance.local(ff)(f))(localInstance.local(fa)(f))
// internal law:
def scopeIsLocalConst[A](fa: F[A], e: E): IsEq[F[A]] =
localInstance.scope(fa)(e) <-> localInstance.local(fa)(_ => e)
}
object LocalLaws {
def apply[F[_], E](implicit instance0: Local[F, E]): LocalLaws[F, E] = {
new LocalLaws[F, E] {
val localInstance: Local[F, E] = instance0
override val askInstance: Ask[F, E] = instance0
}
}
}