withOpen.scala

def withOpen(fileName: String, mode: String, encoding: String)(fp: Iterator[String] => Unit ): Unit = {
    import scala.io.Source
    val source = Source.fromFile(fileName)
    val lines = source.getLines()
    fp(lines)
    source.close
}

withOpen("myfile.txt", "r", "utf-8") { lines =>
    lines.foreach(println)
}