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LiftIO.scala
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LiftIO.scala
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/*
* Copyright 2020-2022 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.effect
import cats.{~>, Applicative, FlatMap, Functor}
import cats.data.{ContT, EitherT, IorT, Kleisli, OptionT, ReaderWriterStateT, StateT, WriterT}
import cats.kernel.Monoid
trait LiftIO[F[_]] {
def liftIO[A](ioa: IO[A]): F[A]
}
object LiftIO {
def apply[F[_]](implicit F: LiftIO[F]): F.type = F
/**
* [[LiftIO.liftIO]] as a natural transformation
*/
def liftK[F[_]](implicit F: LiftIO[F]): IO ~> F =
new (IO ~> F) { def apply[A](fa: IO[A]): F[A] = F.liftIO(fa) }
/**
* [[LiftIO]] instance built for `cats.data.EitherT` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsEitherTLiftIO[F[_], L](
implicit F: LiftIO[F],
FF: Functor[F]): LiftIO[EitherT[F, L, *]] =
new LiftIO[EitherT[F, L, *]] {
override def liftIO[A](ioa: IO[A]): EitherT[F, L, A] =
EitherT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.Kleisli` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsKleisliLiftIO[F[_], R](implicit F: LiftIO[F]): LiftIO[Kleisli[F, R, *]] =
new LiftIO[Kleisli[F, R, *]] {
override def liftIO[A](ioa: IO[A]): Kleisli[F, R, A] =
Kleisli.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.OptionT` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsOptionTLiftIO[F[_]](
implicit F: LiftIO[F],
FF: Functor[F]): LiftIO[OptionT[F, *]] =
new LiftIO[OptionT[F, *]] {
override def liftIO[A](ioa: IO[A]): OptionT[F, A] =
OptionT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.StateT` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsStateTLiftIO[F[_], S](
implicit F: LiftIO[F],
FA: Applicative[F]): LiftIO[StateT[F, S, *]] =
new LiftIO[StateT[F, S, *]] {
override def liftIO[A](ioa: IO[A]): StateT[F, S, A] =
StateT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.WriterT` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsWriterTLiftIO[F[_], L](
implicit F: LiftIO[F],
FA: Applicative[F],
L: Monoid[L]): LiftIO[WriterT[F, L, *]] =
new LiftIO[WriterT[F, L, *]] {
override def liftIO[A](ioa: IO[A]): WriterT[F, L, A] =
WriterT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.IorT` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsIorTLiftIO[F[_], L](
implicit F: LiftIO[F],
FA: Applicative[F]): LiftIO[IorT[F, L, *]] =
new LiftIO[IorT[F, L, *]] {
override def liftIO[A](ioa: IO[A]): IorT[F, L, A] =
IorT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.ReaderWriterStateT` values initialized with any
* `F` data type that also implements `LiftIO`.
*/
implicit def catsReaderWriterStateTLiftIO[F[_], E, L, S](
implicit F: LiftIO[F],
FA: Applicative[F],
L: Monoid[L]): LiftIO[ReaderWriterStateT[F, E, L, S, *]] =
new LiftIO[ReaderWriterStateT[F, E, L, S, *]] {
override def liftIO[A](ioa: IO[A]): ReaderWriterStateT[F, E, L, S, A] =
ReaderWriterStateT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance built for `cats.data.ContT` values initialized with any `F` data type
* that also implements `LiftIO`.
*/
implicit def catsContTLiftIO[F[_], R](
implicit F: LiftIO[F],
FF: FlatMap[F]): LiftIO[ContT[F, R, *]] =
new LiftIO[ContT[F, R, *]] {
override def liftIO[A](ioa: IO[A]): ContT[F, R, A] =
ContT.liftF(F.liftIO(ioa))
}
/**
* [[LiftIO]] instance for [[IO]] values.
*/
implicit val ioLiftIO: LiftIO[IO] =
new LiftIO[IO] { override def liftIO[A](ioa: IO[A]): IO[A] = ioa }
/**
* [[LiftIO]] instance for [[Resource]] values.
*/
implicit def catsEffectLiftIOForResource[F[_]](
implicit F00: LiftIO[F],
F10: Applicative[F]): LiftIO[Resource[F, *]] =
new ResourceLiftIO[F] {
def F0 = F00
def F1 = F10
}
abstract private class ResourceLiftIO[F[_]] extends LiftIO[Resource[F, *]] {
implicit protected def F0: LiftIO[F]
implicit protected def F1: Applicative[F]
def liftIO[A](ioa: IO[A]): Resource[F, A] =
Resource.eval(F0.liftIO(ioa))
}
}