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EffectLaws.scala
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EffectLaws.scala
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/*
* Copyright (c) 2017-2018 The Typelevel Cats-effect Project Developers
*
* 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 effect
package laws
import cats.laws._
trait EffectLaws[F[_]] extends AsyncLaws[F] {
implicit def F: Effect[F]
def runAsyncPureProducesRightIO[A](a: A) = {
val lh = IO.async[Either[Throwable, A]] { cb =>
F.runAsync(F.pure(a))(r => IO(cb(Right(r))))
.unsafeRunSync()
}
lh <-> IO.pure(Right(a))
}
def runAsyncRaiseErrorProducesLeftIO[A](e: Throwable) = {
val lh = IO.async[Either[Throwable, A]] { cb =>
F.runAsync(F.raiseError(e))(r => IO(cb(Right(r))))
.unsafeRunSync()
}
lh <-> IO.pure(Left(e))
}
def runAsyncIgnoresErrorInHandler[A](e: Throwable) = {
val fa = F.pure(())
F.runAsync(fa)(_ => IO.raiseError(e)).toIO <-> IO.pure(())
}
def toIOinverseOfLiftIO[A](ioa: IO[A]) =
F.toIO(F.liftIO(ioa)) <-> ioa
def toIORunAsyncConsistency[A](fa: F[A]) =
Effect.toIOFromRunAsync(fa) <-> F.toIO(fa)
def toIOStackSafety[A](iterations: Int)(fa: F[A]) = {
def loop(n: Int): IO[A] =
if (n > 0) F.toIO(fa).flatMap(_ => loop(n - 1))
else F.toIO(fa)
loop(iterations) <-> F.toIO(fa)
}
}
object EffectLaws {
def apply[F[_]](implicit F0: Effect[F]): EffectLaws[F] = new EffectLaws[F] {
val F = F0
}
}