smithy4s.Lazy.scala Maven / Gradle / Ivy
/*
* Copyright 2021-2024 Disney Streaming
*
* Licensed under the Tomorrow Open Source Technology License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://disneystreaming.github.io/TOST-1.0.txt
*
* 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 smithy4s
final class Lazy[A](make: () => A) {
private[this] var thunk: () => A = make
lazy val value: A = {
val result = thunk()
thunk = null
result
}
def map[B](f: A => B): Lazy[B] = new Lazy(() => f(make()))
}
object Lazy {
def apply[A](a: => A): Lazy[A] = new Lazy(() => a)
}