faith_and_brave https://blog.hatena.ne.jp/faith_and_brave/ Faith and Brave - C++で遊ぼう https://faithandbrave.hateblo.jp/ Scala ScalaにもEitherあったんだな、と。 object Main { def foo(x : Int) : Either[String, Int] = x match { case 0 => Left("invalid arguments!") case _ => Right(x) } def result(a : Either[String, Int]) : Unit = a match { case Left(msg) => println("Error : " + msg) case Right(x) => println(x) } def main(args: Array[Stri… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Ffaithandbrave.hateblo.jp%2Fentry%2F20101014%2F1287040025" title=" Either - Faith and Brave - C++で遊ぼう" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2010-10-14 16:07:05 rich https://faithandbrave.hateblo.jp/entry/20101014/1287040025 1.0 100%