[{"data":1,"prerenderedAt":353},["ShallowReactive",2],{"post-17_kotlin_nothing":3,"blog-categories":156,"blog-sidebar-banners":352},{"post":4},{"id":5,"date":6,"date_gmt":7,"guid":8,"modified":10,"modified_gmt":11,"slug":12,"status":13,"type":14,"link":15,"title":16,"content":18,"excerpt":21,"author":23,"featured_media":24,"comment_status":25,"ping_status":26,"sticky":20,"template":27,"format":28,"meta":29,"categories":31,"tags":33,"acf":34,"aioseo_notices":35,"_links":36,"_embedded":78},522,"2025-06-06T15:30:28","2025-06-06T06:30:28",{"rendered":9},"https://blog.cloco.co.jp/?p=522","2025-06-06T15:30:30","2025-06-06T06:30:30","17_kotlin_nothing","publish","post","https://blog.cloco.co.jp/17_kotlin_nothing/",{"rendered":17},"Kotlin における Nothing の徹底解析",{"rendered":19,"protected":20},"\n\u003Cp>Kotlin の Type システムには、一見神秘的でありながら極めて重要な特殊な型である \u003Ccode>Nothing\u003C/code> が存在します。\u003C/p>\n\n\n\n\u003Cp>この型は Kotlin 開発において独自の役割を果たしています。\u003C/p>\n\n\n\n\u003Cdiv id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n\u003Cdiv class=\"ez-toc-title-container\">\n\u003Cp class=\"ez-toc-title \" >目次\u003C/p>\n\u003Cspan class=\"ez-toc-title-toggle\">\u003Ca href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\">\u003Cspan class=\"ez-toc-js-icon-con\">\u003Cspan class=\"\">\u003Cspan class=\"eztoc-hide\" style=\"display:none;\">Toggle\u003C/span>\u003Cspan class=\"ez-toc-icon-toggle-span\">\u003Csvg style=\"fill: #424242;color:#424242\" xmlns=\"http://www.w3.org/2000/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\">\u003Cpath d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\">\u003C/path>\u003C/svg>\u003Csvg style=\"fill: #424242;color:#424242\" class=\"arrow-unsorted-368013\" xmlns=\"http://www.w3.org/2000/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\">\u003Cpath d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"/>\u003C/svg>\u003C/span>\u003C/span>\u003C/span>\u003C/a>\u003C/span>\u003C/div>\n\u003Cnav>\u003Cul class='ez-toc-list ez-toc-list-level-1 ' >\u003Cli class='ez-toc-page-1 ez-toc-heading-level-2'>\u003Ca class=\"ez-toc-link ez-toc-heading-1\" href=\"https://blog.cloco.co.jp/17_kotlin_nothing/#1_Nothing_%E3%81%A8%E3%81%AF%E4%BD%95%E3%81%8B%EF%BC%9F\" title=\"1. Nothing とは何か？\">1. Nothing とは何か？\u003C/a>\u003C/li>\u003Cli class='ez-toc-page-1 ez-toc-heading-level-2'>\u003Ca class=\"ez-toc-link ez-toc-heading-2\" href=\"https://blog.cloco.co.jp/17_kotlin_nothing/#2_NOTHING_%E3%81%AE%E4%BD%BF%E7%94%A8%E4%BE%8B\" title=\"2. NOTHING の使用例\">2. NOTHING の使用例\u003C/a>\u003C/li>\u003Cli class='ez-toc-page-1 ez-toc-heading-level-2'>\u003Ca class=\"ez-toc-link ez-toc-heading-3\" href=\"https://blog.cloco.co.jp/17_kotlin_nothing/#%E7%B5%90%E8%AB%96\" title=\"結論\">結論\u003C/a>\u003C/li>\u003Cli class='ez-toc-page-1 ez-toc-heading-level-2'>\u003Ca class=\"ez-toc-link ez-toc-heading-4\" href=\"https://blog.cloco.co.jp/17_kotlin_nothing/#%E3%82%B7%E3%82%B9%E3%83%86%E3%83%A0%E9%96%8B%E7%99%BA%E3%81%AE%E3%81%8A%E6%82%A9%E3%81%BF%E3%81%AFcloco%E3%81%AB%E3%81%94%E7%9B%B8%E8%AB%87%E3%81%8F%E3%81%A0%E3%81%95%E3%81%84%EF%BC%81\" title=\"システム開発のお悩みはclocoにご相談ください！\">システム開発のお悩みはclocoにご相談ください！\u003C/a>\u003C/li>\u003C/ul>\u003C/nav>\u003C/div>\n\u003Ch2 class=\"wp-block-heading\">\u003Cspan class=\"ez-toc-section\" id=\"1_Nothing_%E3%81%A8%E3%81%AF%E4%BD%95%E3%81%8B%EF%BC%9F\">\u003C/span>1. Nothing とは何か？\u003Cspan class=\"ez-toc-section-end\">\u003C/span>\u003C/h2>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">1.1 ソースコードから Nothing を見る\u003C/h3>\n\n\n\n\u003Cp>\u003Ccode>Nothing\u003C/code> は \u003Ccode>class\u003C/code> ですが、インスタンスを生成することはできません。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>public class Nothing private constructor()\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>したがって、\u003Ccode>Nothing\u003C/code> 型の戻り値には、明示的な値を \u003Ccode>return\u003C/code> することができません。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun fetchNothing(): Nothing {\n  return ?\n}\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>では、なぜ \u003Ccode>Nothing\u003C/code> が必要なのでしょうか？\u003C/p>\n\n\n\n\u003Cp>なぜなら、\u003Ccode>Nothing\u003C/code> の存在は、\u003Ca href=\"https://blog.cloco.co.jp/13_kotlin_unit/#Unit_とは\" target=\"_blank\" rel=\"noopener\" title=\"\">前回の記事\u003C/a>で述べた「Everything is an Expression」という理念の最後のピースです。\u003C/p>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">1.2 Nothing は他の型のサブタイプである\u003C/h3>\n\n\n\n\u003Cp>下記のコードにおいて、関数 \u003Ccode>throwable\u003C/code> の戻り値の型は何でしょうか？\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun throwable() {\n    throw RuntimeException()\n}\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>前回の \u003Ccode>Unit\u003C/code> についての記事を読んだ方は、この \u003Ccode>throwable\u003C/code> の戻り値は \u003Ccode>Unit\u003C/code> だと思うかもしれませんが、 \u003Ccode>throwable\u003C/code> に \u003Ccode>Unit\u003C/code> を補完してみましょう。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun throwable() {\n    throw RuntimeException()\n    return Unit\n}\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>しかし、この時点で IDE は \u003Ccode>return Unit\u003C/code> が「Unreachable code」であると警告しています。\u003C/p>\n\n\n\n\u003Cp>つまり、関数 \u003Ccode>throwable\u003C/code> に戻り値がある場合、　\u003Ccode>throw RuntimeException()\u003C/code> の時点で既に戻り処理が完了しており、コンパイラによって自動補完される \u003Ccode>return Unit\u003C/code> に依存しているわけではないということです。\u003C/p>\n\n\n\n\u003Cp>次に、記述方法を次のように変更してみましょう。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun throwable() = throw RuntimeException()\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>警告は「’Nothing’ return type needs to be specified explicitly」になります。\u003C/p>\n\n\n\n\u003Cp>つまり、関数 \u003Ccode>throwable\u003C/code> の実際の戻り値の型は \u003Ccode>Unit\u003C/code> ではなく \u003Ccode>Nothing\u003C/code> であるということです。\u003C/p>\n\n\n\n\u003Cp>タイプを補完したら、次のようになります。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun throwable(): Nothing {\n    throw RuntimeException()\n}\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>しかし、この時、注意深い人は気づくかもしれません。\u003C/p>\n\n\n\n\u003Cp>\u003Ccode>Nothing\u003C/code> は省略可能であれば、なぜ IDE は \u003Ccode>Redundant 'Unit' return type\u003C/code> と同様に \u003Ccode>Redundant 'Nothing' return type\u003C/code> と警告しないのか。\u003C/p>\n\n\n\n\u003Cp>また、キーワード \u003Ccode>Nothing\u003C/code> もグレー表示にならないのかと。\u003C/p>\n\n\n\n\u003Cp>なぜなら、関数 \u003Ccode>throwable\u003C/code> の戻り値は実際には \u003Ccode>Unit\u003C/code> であるものの、この場合 \u003Ccode>Nothing\u003C/code> は \u003Ccode>Unit\u003C/code> のサブタイプとして返されるからです。\u003C/p>\n\n\n\n\u003Cp>同様に、\u003Ccode>Nothing\u003C/code> は \u003Ccode>Int\u003C/code> や \u003Ccode>String\u003C/code> などのサブタイプとして返されることが分かります。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun throwable(): Unit = throw RuntimeException()\nfun throwable(): Int = throw RuntimeException()\nfun throwable(): String = throw RuntimeException()\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>言い換えれば、 \u003Ccode>Nothing\u003C/code> は他のすべてのクラスとは異なり、すべての他の型のサブタイプであるということです！\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">\u003Cspan class=\"ez-toc-section\" id=\"2_NOTHING_%E3%81%AE%E4%BD%BF%E7%94%A8%E4%BE%8B\">\u003C/span>2. NOTHING の使用例\u003Cspan class=\"ez-toc-section-end\">\u003C/span>\u003C/h2>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">2.1 例外を投げる際に戻り値がないことを指示する場合\u003C/h3>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun throwable(): Nothing = throw RuntimeException("return Nothing!")\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>より一般的な使用方法\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun fetchValue(id: Int): String {\n  val result = findById(id)\n  if (result != null) {\n    return result\n  } else {\n    throw NullPointerException("ID cannot be null!")\n  }\n}\n\nfun fetchValue(id: Int): String = findById(id) ?: throw NotFoundException()\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>Kotlin 標準ライブラリの \u003Ccode>TODO\u003C/code> も \u003Ccode>Nothing\u003C/code> を利用して実装されています。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>@kotlin.internal.InlineOnly\npublic inline fun TODO(): Nothing = throw NotImplementedError()\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">2.2 型安全な空のコレクションを作成する場合\u003C/h3>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>val empty: List<Nothing> = listOf()\nvar items: List<Item> = empty\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Cp>Kotlin 標準ライブラリの \u003Ccode>EmptyList\u003C/code> も \u003Ccode>Nothing\u003C/code> を利用して実装されています。\u003C/p>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>internal object EmptyList : List<Nothing>, Serializable, RandomAccess\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">2.3 型安全な無限ループとして使用する場合\u003C/h3>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-kotlin\" data-lang=\"kotlin\">\u003Ccode>fun repeat(): Nothing {\n    while (true) {\n        // loop\n    }\n}\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">2.4 再帰の末尾として使用する場合\u003C/h3>\n\n\n\n\u003Cdiv class=\"hcb_wrap\">\u003Cpre class=\"prism line-numbers lang-plain\">\u003Ccode>sealed class LinkedList<out T>\nobject Empty : LinkedList<Nothing>()\ndata class Node<T>(val value: T, val next: LinkedList<T>) : LinkedList<T>()\n\nval list = Node(1, Node(2, Empty))\u003C/code>\u003C/pre>\u003C/div>\n\n\n\n\u003Ch3 class=\"wp-block-heading\">2.5 クロスプラットフォーム開発の場合\u003C/h3>\n\n\n\n\u003Cp>クロスプラットフォーム開発において、異なるプラットフォーム間で型システムの一貫性を保つために \u003Ccode>Nothing\u003C/code> を利用する場合があります。\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">\u003Cspan class=\"ez-toc-section\" id=\"%E7%B5%90%E8%AB%96\">\u003C/span>結論\u003Cspan class=\"ez-toc-section-end\">\u003C/span>\u003C/h2>\n\n\n\n\u003Cp>Tony Hoare（\u003Ccode>null\u003C/code> の創始者）が「I call it (null references) my billion-dollar mistake」と言ったように、Kotlin における「Everything is an Expression」という設計哲学は、　\u003Ccode>null references\u003C/code> を回避するための重要な理念です。\u003C/p>\n\n\n\n\u003Cp>\u003Ccode>Nothing\u003C/code> の登場は、すべてのコードパスに確定した型が存在することを保証する最後のピースとなります。\u003C/p>\n\n\n\n\u003Ch2 class=\"wp-block-heading\">\u003Cspan class=\"ez-toc-section\" id=\"%E3%82%B7%E3%82%B9%E3%83%86%E3%83%A0%E9%96%8B%E7%99%BA%E3%81%AE%E3%81%8A%E6%82%A9%E3%81%BF%E3%81%AFcloco%E3%81%AB%E3%81%94%E7%9B%B8%E8%AB%87%E3%81%8F%E3%81%A0%E3%81%95%E3%81%84%EF%BC%81\">\u003C/span>システム開発のお悩みはclocoにご相談ください！\u003Cspan class=\"ez-toc-section-end\">\u003C/span>\u003C/h2>\n\n\n\n\u003Cp>clocoはシステム開発の支援を行っています。\u003Cbr>最高のチームであなたのプロジェクトをお手伝いさせてください！\u003C/p>\n\n\n\n\u003Cp>少しでもclocoに興味を持っていただけたらぜひホームページを御覧ください。\u003C/p>\n\n\n\n\u003Cdiv style=\"height:24px\" aria-hidden=\"true\" class=\"wp-block-spacer\">\u003C/div>\n\n\n\n\u003Cdiv class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-1 wp-block-buttons-is-layout-flex\">\n\u003Cdiv class=\"wp-block-button has-custom-width wp-block-button__width-50 has-custom-font-size is-style-fill has-medium-font-size\">\u003Ca class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color has-text-align-center wp-element-button\" href=\"https://cloco.co.jp/index.html\" style=\"background-color:#f76a37\" target=\"_blank\" rel=\"noreferrer noopener\">\u003Cstrong>clocoについて詳しく見てみる\u003C/strong>\u003C/a>\u003C/div>\n\u003C/div>\n",false,{"rendered":22,"protected":20},"\u003Cp>Kotlin の Type システムには、一見神秘的でありながら極めて重要な特殊な型である Noth 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