catcheffect.LocalForIOLocal.scala Maven / Gradle / Ivy
/*
* Copyright 2024 Valdemar Grange
*
* 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 catcheffect
import cats._
import cats.effect._
import org.tpolecat.sourcepos.SourcePos
object LocalForIOLocal {
def localForIOLocal[A](iol: IOLocal[A]): Local[IO, A] =
new Local[IO, A] {
override def set[B](fa: IO[B])(c: A)(implicit sp: SourcePos): IO[B] =
iol.get.flatMap(a => iol.set(c) *> fa <* iol.set(a))
override def applicative: Applicative[IO] = implicitly
override def ask(implicit sp: SourcePos): IO[A] = iol.get
override def local[B](fa: IO[B])(f: A => A)(implicit sp: SourcePos): IO[B] =
iol.get.flatMap(p => iol.set(f(p)) *> fa <* iol.set(p))
}
def localForIOLocalDefault[A](a: A): IO[Local[IO, A]] =
IOLocal(a).map(localForIOLocal(_))
}