Scalaで一番よく使うローンパターン - Qiita

import java.io.Writer import scala.io.Source object Using { def apply[A, B](resource: A)(process: A => B)(implicit closer: Closer[A]): B = try { process(resource) } finally { closer.close(resource) } } case class Closer[-A](close: A => Unit) object Closer { implicit val sourceCloser: Closer[Source] = Closer(_.close()) implicit val writerCloser: Closer[Writer] = Closer(_.close()) }

[kooyoo]

参考になった