com.spotify.scio.testing.EqInstances.scala Maven / Gradle / Ivy
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/*
* Copyright 2020 Spotify AB.
*
* 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 com.spotify.scio.testing
import cats.kernel.Eq
import scala.annotation.nowarn
sealed trait FallbackEqInstances {
implicit def fallbackEq[A]: Eq[A] = new Eq[A] {
def eqv(x: A, y: A): Boolean =
(x, y) match {
case (x: Array[_], y: Array[_]) => x.sameElements(y): @nowarn
case _ => Eq.fromUniversalEquals[A].eqv(x, y)
}
}
}
trait EqInstances extends FallbackEqInstances {
// == does not compare arrays for value equality, but for reference equality.
implicit def arrayEq[T](implicit eqT: Eq[T]): Eq[Array[T]] =
new Eq[Array[T]] {
def eqv(xs: Array[T], ys: Array[T]): Boolean =
(xs.length == ys.length) &&
xs.zip(ys).forall { case (x, y) => eqT.eqv(x, y) }
}
}
object EqInstances extends EqInstances