dev.tauri.choam.laws.RefLaws.scala Maven / Gradle / Ivy
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/*
* SPDX-License-Identifier: Apache-2.0
* Copyright 2016-2024 Daniel Urban and contributors listed in NOTICE.txt
*
* 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 dev.tauri.choam
package laws
import cats.kernel.Order
import cats.laws.IsEq
import cats.laws.IsEqArrow
import cats.syntax.all._
sealed trait RefLaws {
def equalsItself[A](r: Ref[A]): IsEq[Boolean] =
Order[Ref[A]].eqv(r, r) <-> true
def uniqueIdsSameType[A](x: Ref[A], y: Ref[A]): IsEq[Boolean] = {
((x eq y) || (x.loc.id =!= y.loc.id)) <-> true
}
def uniqueIdsDifferentType[A, B](x: Ref[A], y: Ref[B]): IsEq[Boolean] = {
((x eq y) || (x.loc.id =!= y.loc.id)) <-> true
}
def hashCodeBasedOnId[A](r: Ref[A]): IsEq[Int] =
r.## <-> r.loc.id.toInt
def orderConsistentWithIdentity[A](x: Ref[A], y: Ref[A]): IsEq[Boolean] =
Order[Ref[A]].eqv(x, y) <-> (x eq y)
def updWithRetIsUpd[A, B, C](x: Ref[A], f: A => A, g: B => C): IsEq[Rxn[B, C]] = {
val uw = x.updWith[B, C] { (a, b) => Rxn.ret((f(a), g(b))) }
val u = x.upd[B, C] { (a, b) => (f(a), g(b)) }
uw <-> u
}
}
object RefLaws {
def newRefLaws: RefLaws =
new RefLaws {}
}