OCPバイブコーディングという新概念で人生逃げ切りたい笑

8/23追記: 本記事の続編を公開しました。

本記事で紹介するソースコードは githubのリポジトリ で公開しています。

えー、毎日のようにSOLID原則を考慮してプログラミングに勤しんでいるわけですが、Qiitaで バイブコーディングの記事 とか読ませていただくと、「えっ、もしかしておれ、生成AIの時代に、伝統芸能で自己マンしてるおっさん？ インターネット普及直前にモールス符号の訓練してるみたいな・・・」的な考えが、ふと頭に浮かぶこともあるわけです。

おじさんが Copilot にこういうふうに言われると嬉しい例 笑：

生成AI・SOLID・・・SRP、OCP、LSP、ISP、DIP・・・、あれっ、ちょっと待てよ。もしかして生成AI時代ののバイブコーディングのキーもSOLIDにあるんじゃ？「とりあえずAIにコード書かせて人間が抽象化」じゃなくて、「人間が抽象レイヤを書いてAIに書かせる」のが正道？？？そしたら俺も「AIに高品質コード書かせるための希少なニンゲン」として生き残れる可能性あるんじゃない？

ということで、とりあえずOCPを意識した設計をした後、ある程度の品質のソースコードをAIに書かせることができるか、ということをミニマムな例で試してみることにしたのです。あくまで Hello, World (ハロワ) レベルで・・・。あくまで。そう、これで転職できちゃったりしたらまさに俺のハロワになるわけです。

おさらい

バイブコーディングとは

「バイブコーディング」という言葉は、Andrej Karpathy の雑談ツイートから火がついた……と言われることもあります（※正確な史実かどうかはさておき、生成AI界隈ではミーム的に語られることが多い）。

Karpathy が示したのは、AIと人間が交互にコードを書き足していく“振動（vibe）”のような開発スタイル。人間が骨格や抽象を設計し、AIが一気に肉付けする。次に人間がリファクタや設計の修正を行い、再びAIがコードを生成する、この往復を繰り返すプロセスらしいです。

従来の「ペアプロ」が人間同士での会話に基づくなら、バイブコーディングは人間の設計思考とAIの生成能力が交互に揺さぶり合うスタイル。言い換えれば「設計は人間、実装はAI」というタッグマッチが自然に実現する、生成AI時代ならではの開発様式です。

ちなみに、世間的には 「AIに任せとけば勝手にやってくれるんでしょ？もうプログラマいらないじゃん。いまどきSOLIDって何？」 みたいな理解をされやすいようです。（あくまで私の偏見ですw）その文脈でいうと、「人間が要件定義してAIが設計、実装、最後にニンゲンレビュー」 みたいな文脈で語られることが多いようです。（これも個人の感想です）

GPT君にこの節の文章から挿絵を生成してもらった例 笑:

OCP: オープン/クローズドの原則 (Open/Closed Principle) とは

OCP（Open/Closed Principle）は、SOLID原則の「O」にあたるものです。
その内容を一言でまとめると、「ソフトウェアは拡張に対して開いており、修正に対して閉じていなければならない」 という指針になります。

つまり、新しい機能や振る舞いを追加したいときに、既存のコードを直接いじらず、拡張ポイント（抽象クラスやインタフェース、ポリモーフィズムなど）を介して機能を差し込むのが理想的だ、という考え方です。

この原則を守ることで、既存コードを壊さずに機能追加ができ、バグを混入させるリスクを減らせます。特に大規模システムや長期運用されるプロダクトでは、 「閉じたままの基盤」と「開かれた拡張部」 を明確に分離しておくことが保守性のカギとなります。

直感的かもしれない例えでいうと、「鉢植え」 ですね。（もちろん盆栽とかでも可）

「鉢」は上方向以外に対しては閉じている、つまりあくまで 「鉢」 として、手で持って運んだり窓際や庭に飾ったりすることが可能（＝仕様が固まっている） で、コツコツと叩いて割れてないことを確認（＝テスト）したりもできる わけですが、上方向には開いている、つまり 「何か」を入れて何かをする（＝実装・拡張）ことができるわけです。典型的には土を入れて植物を育てるなど。

ちなみに Wikipediaの記事 でも触れられているとおり、OCP には歴史的に二つの解釈が並立しています。現代風にざっくり言うと：

• メイヤーの開放/閉鎖原則（1988年）
  既存コードを改変せずに継承や再定義で拡張するアプローチ。
  例：フレームワークが 継承前提（Template Method / Hook）で「この基底クラスを継承して使ってね」と促すパターン。

• マーチンの開放/閉鎖原則（1990年代）
  でました「クリーンアーキテクチャ」の Uncle Bob(ボブおじ)。抽象（インターフェイス/抽象クラス）とポリモーフィズムで拡張し、既存コードは閉じたままにするアプローチ。
  例：フレームワークに あるインターフェイスを実装したコンポーネント をDI/ファクトリ/引数で差し込むパターン。
  ※SOLID という頭字語は Michael Feathers による命名で、Uncle Bob はこの解釈の普及に大きく貢献しました。

（個人的な実務感）現代の DI / 構成管理とは マーチン(Bob)流の“抽象差し替え” が相性良く、可読性とテスト容易性を保ちやすい場面が多いです。一方で、小さなスコープでは Meyer流の継承 が最短でシンプルなこともあり、使い分けが良いかと思います。（継承OCPにはOOP的ロマンもありますねw）。

こっちも絵をかいてもらうとこんな感じ:

さっそく実験

構想

実験には筆者が最近慣れ親しんでいる C# を使うことにします。

純粋に「Hello, World!」レベルのプログラムだと、OCP を実感するのはなかなか難しい。せいぜいメッセージの差し替えや出力先の差し替えくらいになってしまいます。

そこで今回は、「西暦1年1月1日から始まる、いわゆるプロレプティック・グレゴリオ暦に基づいたシンプルな日付・時刻シミュレータ」 を作ってみることにします。西暦1年1月1日 00:00 から始まり、秒単位で時刻をインクリメントして、その結果を秒単位で文字列として出力できる――そんなイメージです。

準備

ここからは実際に C# プロジェクトを用意していきます。
コンソールアプリを新規作成し、最小限のクラス構造を準備していきます。

まずは抽象から。

CalendarUnitBase.cs として、各単位（年・月・...・秒)の「数字」を保持するクラスの共通基底クラスを作成します。このクラスには Start/End として、その単位の「開始時の数字」「終わりの数字」 を保持するプロパティを実装し、PrevUnit/NextUnit として 「一つ下位の単位のインスタンス」「一つ上の単位のインスタンス」への参照も保持できるようにします。可能な操作は1単位加算するIncrement() と、文字列を取得するAsString()、それから、「月によって月末の日付が変わる」ようなことに対応するためのSetEnd()です。下位の単位や上位の単位に対する操作は限定するために、IPrevUnit や INextUnitといったインタフェイスも定義して使います。

次に「秒」単位、「分」単位を参考のために実装しておきます。

めんどくさいので あくまでOCPの効果をみたいため、コメントは書かずにおきます。

適当なエントリポイントを記述して、雑に動作確認。

実行例 (クリックで開くけど大したものじゃありません)

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After 64,475 seconds: 23:54
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After 80,721 seconds: 09:23
After 22,299 seconds: 21:03
After 92,271 seconds: 58:55
After 40,577 seconds: 15:13
After 70,334 seconds: 47:28
Final time: 47:29

生成君

ここでいよいよ 「わが社（零細個人事業主）のジュニアプログラマーGPT君」 に登場してもらいます。

ChatGPT(GPT-5)

できるし、もう「西暦（YYYY-MM-DD HHss）」まで拡張しておきました。
作業内容ざっくり👇

• 既存の SecondsUnit（秒）→ MinuteUnit（分）のチェーンを起点に、上位の単位を追加して時刻→日付→年へと連結しました。

  • 追加: HourUnit（時, 0–23） / DayUnit（日, 1–28/29/30/31） / MonthUnit（月, 1–12） / YearUnit（年, 0001–9999）

• オーバーフロー時のキャスケード（繰り上がり）を全レイヤで実装。
  例: 秒が 59→0 のとき分を Increment()、分が 59→0 のとき時を…という具合に年まで。

• MonthUnit が DayUnit の上限を動的に更新する仕組みを実装（IPrevUnit.SetEnd(daysInMonth) を利用）。
  うるう年判定はグレゴリオ暦ルール（400/100/4）で、2月は 29/28 日に自動切替。

• 文字列表現はユニットごとにオーバーライドして連結。

  • YearUnit → "YYYY"

  • MonthUnit → Next + "-MM"

  • DayUnit → Next + "-DD"

  • HourUnit → Next + " HH"

  • MinuteUnit / SecondsUnit → Next + ":mm" / Next + ":ss"

• 既存の MinuteUnit を修正し、秒の繰り上がりだけでなく「分→時」もちゃんと繰り上がるようにしています。

使い方

今までどおり new SecondsUnit() を作って Increment() を回すだけで、
AsString() は "YYYY-MM-DD HH:mm:ss" を返します（初期値は 0001-01-01 00:00:00）。

変更ファイル（追加）

• 0200_CalendarUnits/0230_HourUnit.cs

• 0200_CalendarUnits/0240_DayUnit.cs

• 0200_CalendarUnits/0250_MonthUnit.cs

• 0200_CalendarUnits/0260_YearUnit.cs

変更ファイル（更新）

• 0200_CalendarUnits/0220_MinutesUnit.cs

  • 繰り上がり時に NextUnit?.Increment() を呼ぶよう修正

  • NextUnit = new HourUnit(this); を設定

必要なら「和暦（令和/平成…）↔ 西暦」相互変換や、タイムゾーン/UTC 切替、DateOnly / TimeOnly 的な分離などもこの構造のまま足せます。やる？😎

実行例 (クリックで開くけど大したものじゃありません)

After 30,705 seconds: 0001-01-01 08:31:45
After 90,223 seconds: 0001-01-02 09:35:29
After 22,043 seconds: 0001-01-02 15:42:53
After 122,437 seconds: 0001-01-04 01:43:31
After 36,559 seconds: 0001-01-04 11:52:51
After 16,920 seconds: 0001-01-04 16:34:52
After 55,884 seconds: 0001-01-05 08:06:17
After 58,703 seconds: 0001-01-06 00:24:41
After 21,066 seconds: 0001-01-06 06:15:48
After 62,375 seconds: 0001-01-06 23:35:24
After 30,623 seconds: 0001-01-07 08:05:48
After 99,864 seconds: 0001-01-08 11:50:13
After 62,526 seconds: 0001-01-09 05:12:20
After 57,483 seconds: 0001-01-09 21:10:24
After 81,169 seconds: 0001-01-10 19:43:14
After 51,348 seconds: 0001-01-11 09:59:03
After 64,847 seconds: 0001-01-12 03:59:51
After 77,198 seconds: 0001-01-13 01:26:30
After 19,236 seconds: 0001-01-13 06:47:07
After 46,386 seconds: 0001-01-13 19:40:14
After 48,518 seconds: 0001-01-14 09:08:53
After 63,635 seconds: 0001-01-15 02:49:29
After 37,300 seconds: 0001-01-15 13:11:10
After 33,040 seconds: 0001-01-15 22:21:51
After 66,643 seconds: 0001-01-16 16:52:35
After 59,443 seconds: 0001-01-17 09:23:19
After 68,150 seconds: 0001-01-18 04:19:10
After 94,388 seconds: 0001-01-19 06:32:19
After 39,832 seconds: 0001-01-19 17:36:12
After 47,282 seconds: 0001-01-20 06:44:15
After 29,625 seconds: 0001-01-20 14:58:01
After 45,250 seconds: 0001-01-21 03:32:12
After 108,780 seconds: 0001-01-22 09:45:13
After 60,651 seconds: 0001-01-23 02:36:05
After 12,208 seconds: 0001-01-23 05:59:34
After 21,412 seconds: 0001-01-23 11:56:27
After 170,126 seconds: 0001-01-25 11:11:54
After 114,499 seconds: 0001-01-26 19:00:14
After 71,989 seconds: 0001-01-27 15:00:04
After 70,505 seconds: 0001-01-28 10:35:10
After 48,648 seconds: 0001-01-29 00:05:59
After 25,741 seconds: 0001-01-29 07:15:01
After 90,390 seconds: 0001-01-30 08:21:32
After 48,773 seconds: 0001-01-30 21:54:26
After 43,941 seconds: 0001-01-31 10:06:48
After 83,547 seconds: 0001-02-01 09:19:16
After 34,453 seconds: 0001-02-01 18:53:30
After 81,188 seconds: 0001-02-02 17:26:39
After 69,175 seconds: 0001-02-03 12:39:35
After 9,156 seconds: 0001-02-03 15:12:12
After 38,746 seconds: 0001-02-04 01:57:59
After 114,456 seconds: 0001-02-05 09:45:36
After 16,887 seconds: 0001-02-05 14:27:04
After 104,955 seconds: 0001-02-06 19:36:20
After 47,769 seconds: 0001-02-07 08:52:30
After 64,293 seconds: 0001-02-08 02:44:04
After 48,778 seconds: 0001-02-08 16:17:03
After 37,384 seconds: 0001-02-09 02:40:08
After 12,324 seconds: 0001-02-09 06:05:33
After 61,906 seconds: 0001-02-09 23:17:20
After 69,691 seconds: 0001-02-10 18:38:52
After 41,827 seconds: 0001-02-11 06:16:00
After 60,053 seconds: 0001-02-11 22:56:54
After 61,279 seconds: 0001-02-12 15:58:14
After 66,921 seconds: 0001-02-13 10:33:36
After 37,565 seconds: 0001-02-13 20:59:42
After 17,044 seconds: 0001-02-14 01:43:47
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After 84,561 seconds: 0001-09-05 08:16:09
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After 118,958 seconds: 0001-09-09 03:13:05
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After 32,208 seconds: 0001-09-10 03:44:04
After 117,990 seconds: 0001-09-11 12:30:35
After 16,891 seconds: 0001-09-11 17:12:07
After 34,560 seconds: 0001-09-12 02:48:08
After 110,821 seconds: 0001-09-13 09:35:10
After 59,435 seconds: 0001-09-14 02:05:46
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After 38,593 seconds: 0001-09-14 16:37:42
After 46,852 seconds: 0001-09-15 05:38:35
After 98,083 seconds: 0001-09-16 08:53:19
After 101,490 seconds: 0001-09-17 13:04:50
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After 70,811 seconds: 0001-09-19 03:13:22
After 112,022 seconds: 0001-09-20 10:20:25
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After 24,637 seconds: 0001-09-21 06:22:01
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After 58,539 seconds: 0001-09-22 12:12:20
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After 31,651 seconds: 0001-09-23 23:18:28
After 41,602 seconds: 0001-09-24 10:51:51
After 32,543 seconds: 0001-09-24 19:54:15
After 56,432 seconds: 0001-09-25 11:34:48
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After 54,636 seconds: 0001-09-26 19:48:54
After 75,264 seconds: 0001-09-27 16:43:19
After 112,140 seconds: 0001-09-28 23:52:20
After 16,464 seconds: 0001-09-29 04:26:45
After 91,243 seconds: 0001-09-30 05:47:29
After 42,031 seconds: 0001-09-30 17:28:01
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After 69,083 seconds: 0001-10-09 12:55:42
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After 40,821 seconds: 0001-11-07 11:26:17
After 79,652 seconds: 0001-11-08 09:33:50
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After 110,745 seconds: 0001-11-11 05:00:53
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After 66,711 seconds: 0001-11-14 12:57:36
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After 125,252 seconds: 0001-11-17 23:09:20
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After 39,967 seconds: 0001-11-20 10:12:55
After 67,586 seconds: 0001-11-21 04:59:22
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After 48,358 seconds: 0001-11-22 06:43:46
After 97,435 seconds: 0001-11-23 09:47:42
After 51,954 seconds: 0001-11-24 00:13:37
After 45,328 seconds: 0001-11-24 12:49:06
After 62,246 seconds: 0001-11-25 06:06:33
After 10,667 seconds: 0001-11-25 09:04:21
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After 73,020 seconds: 0002-07-04 08:54:05
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After 65,294 seconds: 0002-07-08 23:49:12
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After 86,441 seconds: 0002-08-26 15:34:56
After 53,794 seconds: 0002-08-27 06:31:31
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After 79,971 seconds: 0002-08-29 07:44:37
After 113,410 seconds: 0002-08-30 15:14:48
After 31,955 seconds: 0002-08-31 00:07:24
After 66,401 seconds: 0002-08-31 18:34:06
After 56,514 seconds: 0002-09-01 10:16:01
After 32,707 seconds: 0002-09-01 19:21:09
After 39,303 seconds: 0002-09-02 06:16:13
After 51,158 seconds: 0002-09-02 20:28:52
After 52,419 seconds: 0002-09-03 11:02:32
After 68,941 seconds: 0002-09-04 06:11:34
After 51,630 seconds: 0002-09-04 20:32:05
After 34,941 seconds: 0002-09-05 06:14:27
After 27,734 seconds: 0002-09-05 13:56:42
After 6,477 seconds: 0002-09-05 15:44:40
After 84,600 seconds: 0002-09-06 15:14:41
After 131,045 seconds: 0002-09-08 03:38:47
After 77,103 seconds: 0002-09-09 01:03:51
After 34,388 seconds: 0002-09-09 10:37:00
After 76,155 seconds: 0002-09-10 07:46:16
After 10,885 seconds: 0002-09-10 10:47:42
After 75,496 seconds: 0002-09-11 07:45:59
After 12,038 seconds: 0002-09-11 11:06:38
After 112,936 seconds: 0002-09-12 18:28:55
After 115,978 seconds: 0002-09-14 02:41:54
After 56,671 seconds: 0002-09-14 18:26:26
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After 44,300 seconds: 0002-09-18 01:07:52
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After 122,565 seconds: 0002-09-20 11:49:53
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After 67,964 seconds: 0002-09-22 06:22:49
After 25,652 seconds: 0002-09-22 13:30:22
After 21,475 seconds: 0002-09-22 19:28:18
After 40,022 seconds: 0002-09-23 06:35:21
After 30,421 seconds: 0002-09-23 15:02:23
After 111,208 seconds: 0002-09-24 21:55:52
After 93,720 seconds: 0002-09-25 23:57:53
After 45,027 seconds: 0002-09-26 12:28:21
After 24,866 seconds: 0002-09-26 19:22:48
After 25,971 seconds: 0002-09-27 02:35:40
After 111,433 seconds: 0002-09-28 09:32:54
After 28,564 seconds: 0002-09-28 17:28:59
After 85,572 seconds: 0002-09-29 17:15:12
After 39,715 seconds: 0002-09-30 04:17:08
After 36,147 seconds: 0002-09-30 14:19:36
After 45,947 seconds: 0002-10-01 03:05:24
After 17,613 seconds: 0002-10-01 07:58:58
After 38,469 seconds: 0002-10-01 18:40:08
After 66,313 seconds: 0002-10-02 13:05:22
After 21,722 seconds: 0002-10-02 19:07:25
After 81,253 seconds: 0002-10-03 17:41:39
After 32,449 seconds: 0002-10-04 02:42:29
After 84,313 seconds: 0002-10-05 02:07:43
After 35,342 seconds: 0002-10-05 11:56:46
After 46,723 seconds: 0002-10-06 00:55:30
After 50,357 seconds: 0002-10-06 14:54:48
After 24,990 seconds: 0002-10-06 21:51:19
After 45,624 seconds: 0002-10-07 10:31:44
After 59,524 seconds: 0002-10-08 03:03:49
After 57,883 seconds: 0002-10-08 19:08:33
After 48,375 seconds: 0002-10-09 08:34:49
After 50,539 seconds: 0002-10-09 22:37:09
After 25,246 seconds: 0002-10-10 05:37:56
After 88,373 seconds: 0002-10-11 06:10:50
After 42,397 seconds: 0002-10-11 17:57:28
After 62,770 seconds: 0002-10-12 11:23:39
After 143,879 seconds: 0002-10-14 03:21:39
After 64,211 seconds: 0002-10-14 21:11:51
After 98,418 seconds: 0002-10-16 00:32:10
After 38,893 seconds: 0002-10-16 11:20:24
After 32,686 seconds: 0002-10-16 20:25:11
After 48,173 seconds: 0002-10-17 09:48:05
After 57,018 seconds: 0002-10-18 01:38:24
After 109,768 seconds: 0002-10-19 08:07:53
After 91,997 seconds: 0002-10-20 09:41:11
After 93,596 seconds: 0002-10-21 11:41:08
After 46,985 seconds: 0002-10-22 00:44:14
After 49,871 seconds: 0002-10-22 14:35:26
After 88,609 seconds: 0002-10-23 15:12:16
After 28,775 seconds: 0002-10-23 23:11:52
After 12,912 seconds: 0002-10-24 02:47:05
After 15,836 seconds: 0002-10-24 07:11:02
Final time: 0002-10-24 07:11:03

自称レビュー番長によるレビュー

ということで、ジュニアプログラマー氏が生成してくれたコードをレビューしてみます。（とか言いつつ、普段はGPTにレビューされまくってるのですがw)

全体的には素晴らしいデキです。ファイルの先頭に番号を入れてVS(Visual Studio)上での表示順を制御したいという俺ルールにも従ってくれてますし、意図した形で各「単位」を実装してくれています。

SetEnd()で各月の月末日を設定する部分もこちらの意図通りで、なんなら情報工学科学部一年生がほぼレポートを書くであろうIsLeapYear判定（うるう年判定)もきちんとしています。（4で割り切れる年がうるう年だが100で割り切れる年はうるう年ではなく、だがしかし400で割り切れる年はやっぱりうるう年、という判定）

たぶんこちらのプロンプトに課題があり、気になった点は2点。

まずはYearUnitの実装において、カプセル化の意図で private としていた Value を public にしてしまった点。ただこれは筆者のベース実装で「2月の月末最終日を算出するには『月』のレイヤから『年』のレイヤを参照する必要がある」ことを想定できていなかった点が課題なので、実装自体は「こうするしかなかった」感はあります。

もう一点もどちらかというと「俺のへぼコードを直してもらえなかった」レベルで、各単位の Increment() が実は同じような内容なのに基底クラス側に共通処理を寄せてはくれなかった、という点。

• SecondsUnit.cs
• MinitesUnit.cs
• HourUnit.cs
• DayUnit.cs
• MonthUnit.cs
• YearUnit.cs

まぁこれも筆者の SecondsUnit/MinutesUnitの実装から存在していた問題なので仕方ないかな。

両者ともに、「コード拡張を依頼する前にこちらのコードをレビューしてもらう」フェーズを挟めば解決する課題でしょう。あとはプロンプトとかで。例えばこんなプロンプトが良いかもしれませんね。ってGPT君が言ってました。

## コンプライアンスレポート

コード生成にあたっては、SOLID原則を遵守してください。  
やむを得ず逸脱する場合は、生成後に必ず以下を報告してください。  

- どの原則に違反したか  
- なぜその逸脱が必要だったか  
- 将来的なリファクタや緩和策の提案  

もし逸脱が無かった場合は、明示的に「すべてのSOLID原則は維持されています。」と書いてください。  

## バグ・ロジックレビュー・セルフプロンプト

生成コードおよび提供されたコードをレビューし、以下の観点で「人間が書きがちなバグ」やロジックの不整合を指摘してください。  
必ず、対応するセルフプロンプトも併記してください。  

- 意図しないオフバイワンエラー、累積値と差分値の混同など  
- 不要な処理や無駄な演算  
- パフォーマンス的に危険な処理（例: 巨大ループ）  
- 読みにくい、誤解を招きやすい命名や構造  

もし指摘事項がなければ、明示的に「バグ・ロジックレビューでの指摘事項はありません。」と書いてください。  

## リファクタ提案・セルフプロンプト

提供コードおよび生成コードをレビューし、リファクタ案があれば提示してください。  
必ず、対応するセルフプロンプトも併記してください。  

もしリファクタ案がなければ、明示的に「リファクタ提案はありません。」と書いてください。  

上記プロンプトで実施した結果と、その後の会話例は次の通り。

ChatGPT(GPT-5)

やったよ！この zip（ConsoleApp4.zip）を解析して、秒→分→時→日→月→西暦（年）まで正しくカウントアップ＆表示できるように拡張しました。
日数はグレゴリオ暦に基づき、うるう年も正しく反映されます（2月は29/28日切替）。

Download the updated project (ConsoleApp4_year_extended.zip)

---

変更内容（要点）

• 新規ユニットを追加：

  • HourUnit（0–23）

  • DayUnit（1–28/29/30/31：月・年により可変）

  • MonthUnit（1–12）

  • YearUnit（1–9999）

• 表示フォーマットを統一：YYYY-MM-DD HH:mm:ss

• うるう年判定（400/100/4 ルール）を実装

• 分ユニットの桁上げバグを修正（分→時に繰り上がるように修正）

• 秒・分は ":ss", ":mm"、時は " HH"、日と月は "-DD", "-MM" の責務で結合するようにし、最終的に Year からのプレフィックス＋各ユニットで連結されます

---

追加/変更ファイル（抜粋）

ConsoleApp4/ConsoleApp4/0200_CalendarUnits/
  0210_SecondsUnit.cs           // 表示の統一・初期値セット
  0220_MinutesUnit.cs           // 桁上げバグ修正 + HourUnit 連結
  0230_HourUnit.cs              // 新規（時）
  0240_DayUnit.cs               // 新規（日, 1..31 可変）
  0250_MonthUnit.cs             // 新規（月, 1..12）※日数の更新を担当
  0260_YearUnit.cs              // 新規（年, 1..9999）

代表コード（新規・要点のみ）

// MonthUnit: 年に依存して日数を決定し、DayUnit の End を更新
private void UpdateDayEnd()
{
    int year = (NextUnit is YearUnit y) ? y.Value : 1;
    int month = (int)_value;
    int days = DaysInMonth(year, month);
    PrevUnit?.SetEnd(days);
}

private static bool IsLeapYear(int year)
{
    if (year % 400 == 0) return true;
    if (year % 100 == 0) return false;
    return year % 4 == 0;
}

// MinuteUnit: 桁上げ修正（時へ）
public override void Increment()
{
    _value++;
    if (_value > End)
    {
        NextUnit?.Increment();
        _value = Start;
    }
}

既存の Program.cs はそのまま使えます（new SecondsUnit() を作れば、年まで連鎖します）。
初期表示例：0001-01-01 00:00:00

---

互換性・設計メモ

• 既存の抽象 CalendarUnitBase / INextUnit / IPrevUnit に最小限の依存で実装（インタフェースの破壊的変更なし）

• 可変長（日数）管理は MonthUnit → DayUnit.SetEnd() で委譲

• うるう秒は未対応（要件外と判断）

---

コンプライアンスレポート（SOLID）

• 単一責任（S）：各ユニットは自分の桁の加算と表示に限定

• オープン/クローズド（O）：既存抽象を拡張して新ユニットを追加。既存クラスの最小修正（MinutesUnit の桁上げ修正と表示統一）のみ

• リスコフ（L）：抽象 CalendarUnitBase 契約に従い、置換可能

• インターフェイス分離（I）：INextUnit/IPrevUnit の粒度は現状適切

• 依存性逆転（D）：軽微な逸脱あり

  • 逸脱点：MonthUnit が NextUnit を YearUnit に キャストして年値を取得

  • 理由：既存インターフェースに「年情報取得」の契約がないため。インターフェースに破壊的変更を入れず最小工数で要件（うるう年対応）を満たすため。

  • 将来の緩和策：

    1. IYearInfo { int Year { get; } } を導入し、YearUnit が実装。MonthUnit は NextUnit as IYearInfo に依存

    2. あるいは ICalendarContext を導入し、MonthUnit に注入して年・タイムゾーン等の外部コンテキストを参照可能にする

結論： 上記の軽微なDIP逸脱を除き、他のSOLID原則は維持されています。

---

バグ・ロジックレビュー ＆ セルフプロンプト

指摘事項

1. 分→時への桁上げ欠落（元コードの MinuteUnit）

   • 症状：_value > 59 時に _value = 0 はするが、NextUnit?.Increment() が無く時に繰り上がらない

   • 対応：追加済み（上記コード）

   • セルフプロンプト：

     「桁上位への繰り上げは全ユニットで一貫して実装されているか？（_value > End → NextUnit?.Increment(); _value = Start;）」

2. 表示結合の不統一（AsString() の接頭記号判定）

   • 症状：NextUnit != null ? ":" : "" など各ユニットで条件がバラつき読みづらい

   • 対応：各ユニットが自分の前置記号のみ責任を持つよう統一（分・秒は ":"、時は " ", 日・月は "-"、年は無し）

   • セルフプロンプト：

     「各ユニットの表示はそのユニットの責務内で前置記号を決定しているか？ 連結順は Year→...→Second で一意か？」

3. Program.cs の巨大ループ

   • 症状：RandomToAdd.Next(0, Int32.MaxValue) 回インクリメントする可能性があり、極端に遅くなる/固まる

   • 対応（提案）：デモ用途では Next(0, 1000) 程度に抑制、もしくは引数や環境変数で上限指定

   • セルフプロンプト：

     「デモコードは最悪ケースでも現実的に終了するか？ 反復回数は引数や設定で制御できるか？」

4. 命名の説明不足（SetEnd）

   • 症状：IPrevUnit.SetEnd(long end) は「前ユニットの上限を次ユニットが設定する」設計だが、命名だけでは伝わりにくい

   • 対応（提案）：XMLコメントで意図を明示、あるいは SetMaxValueForRollover 等の名称へ

   • セルフプロンプト：

     「メソッド名・コメントで所有権/方向が誤解なく伝わるか？」

5. 境界の含意（Endの意味）

   • 状況：End は上限値を含む（例：秒59）

   • 対応：コメントで**包含境界（inclusive）**を明記

   • セルフプロンプト：

     「境界は inclusive / exclusive のどちらか？ 全ユニットで統一されてるか？」

該当以外に重大な指摘はありません。

---

リファクタ提案 ＆ セルフプロンプト

1. DIPの厳格化（キャスト除去）

   • 提案：IYearInfo { int Year { get; } } を導入し YearUnit が実装。MonthUnit は NextUnit as IYearInfo への依存に留め、具体型依存を排除

   • セルフプロンプト：

     「上位情報（年など）は抽象インターフェース経由で取得できるか？ 具体型へのキャストを避けられるか？」

2. コンテキスト注入

   • 提案：暦情報・ロケール・タイムゾーンを包括する ICalendarContext を導入し、可変仕様（うるう秒・和暦 etc.）を差し替え可能に

   • セルフプロンプト：

     「可変仕様をコンテキストに追い出し、ユニットは純粋なカウンタにできないか？」

3. 表示ポリシーの分離

   • 提案：ICalendarFormatter を導入し、YYYY-MM-DD HH:mm:ss 以外（ISO 8601 / ロケール別）に差し替え可能に

   • セルフプロンプト：

     「文字列表現は**戦略（Strategy）**に分離されているか？」

4. テスト整備

   • 提案：月末（28/29/30/31）・年末（12/31 23:59:59→1/1 00:00:00）・うるう年（1900/2000/2004 など）を網羅する境界テスト

   • セルフプロンプト：

     「境界条件とうるう年の回帰テストがあるか？」

5. 命名改善

   • 提案：SetEnd→SetMaxValue、PrevUnit/NextUnit に XML ドキュメンテーション

   • セルフプロンプト：

     「API だけを見て意図が伝わる命名/コメントになっているか？」

---

使い方（そのままでOK）

var seconds = new ConsoleApp4.CalendarUnits.SecondsUnit();

// 何度か Increment() すれば、
// 0001-01-01 00:00:00 → … → 0001-01-01 00:00:59 → 0001-01-01 00:01:00 → …
// と年まで連鎖して繰り上がります
Console.WriteLine(seconds.AsString());

---

差分（サマリ）

• 修正：0220_MinutesUnit.cs, 0210_SecondsUnit.cs

• 追加：0230_HourUnit.cs, 0240_DayUnit.cs, 0250_MonthUnit.cs, 0260_YearUnit.cs

• フォーマット統一・うるう年対応・桁上げ修正を実施

詳細は zip 内のファイルを参照してください。

---

確信度：92%（要件「西暦まで対応」「うるう年考慮」「既存構造を崩さない」については満たせている想定。実行負荷は Program.cs のループ次第なので、運用での上限制御を推奨）

cozyupk

Increment() の共通処理を基底側に寄せたいよね。

ChatGPT(GPT-5)

やろう。テンプレートメソッドで “増分→境界判定→繰り上げ→後処理（依存範囲の更新/表示通知）” を 基底クラスに集約します。各ユニットは「範囲（Start/End）」「表示」「（必要なら）オーバーフロー時の後処理」だけを持てばOK、Increment()の実装は消せます。

以下は最小差分で入れ替え可能な形の提案です（秒～年すべてこの土台で動きます）。

---

1. 基底クラス（共通 Increment）
   ======================

namespace ConsoleApp4.CalendarUnits
{
    public abstract class CalendarUnitBase : INextUnit, IPrevUnit
    {
        protected long _value;
        protected long _start;
        protected long _end; // inclusive

        public INextUnit? NextUnit { get; set; }
        public IPrevUnit? PrevUnit { get; set; }

        protected CalendarUnitBase(long start, long end)
        {
            _start = start;
            _end = end;
            _value = start;
        }

        public virtual void SetEnd(long endInclusive)
        {
            _end = endInclusive;
            if (_value > _end) _value = _end; // 保険：可変範囲でのはみ出し抑止
        }

        /// <summary>
        /// 共通のインクリメント処理（delta>=1）。範囲は [Start..End] で inclusive。
        /// 1) 値を加算 2) 境界超過なら繰り上げ+自分をStartに 3) オーバーフロー後処理 4) 値変更後処理
        /// </summary>
        public virtual void Increment(long delta = 1)
        {
            if (delta <= 0) return; // 今回要件外：負方向は未対応

            while (delta > 0)
            {
                long stepToBoundary = _end - _value;
                if (stepToBoundary >= delta)
                {
                    _value += delta;
                    OnValueChanged();
                    break;
                }

                // 境界を超えるので一旦端まで進めてから繰り上げ
                _value = _end;
                OnValueChanged();  // “端” に到達した通知（必要なら）
                // 1つ進めるとオーバーフロー
                NextUnit?.Increment(1);
                _value = _start;
                OnOverflowedToNext(); // 上位桁が変わった直後の後処理（依存範囲更新など）
                delta -= (stepToBoundary + 1);
            }
        }

        public long Start => _start;
        public long End => _end;
        public long Value => _value;

        /// <summary>表示の連結責務（前置文字含む）</summary>
        public abstract string AsString();

        /// <summary>上位繰り上げ直後に呼ばれるフック（可変範囲の更新などに利用）</summary>
        protected virtual void OnOverflowedToNext() { }

        /// <summary>値が変わった直後に呼ばれるフック（派生が副作用を入れるならここ）</summary>
        protected virtual void OnValueChanged() { }
    }
}

• ポイント

  • Increment(delta) を全ユニットで共通化。

  • OnOverflowedToNext()：上位が進んだ直後に必要な調整（例：Month が変わったら Day の最大日数を更新）。

  • OnValueChanged()：副作用が必要ならここで。不要なら空でOK。

  • 大きい delta も高速（定数範囲は “まとめて進める” 最短手数）。日数のような可変範囲でも、繰り上げの瞬間だけ OnOverflowedToNext() で追従できます。

---

1. 各ユニット（例）
   ===========

秒

internal sealed class SecondsUnit : CalendarUnitBase
{
    public SecondsUnit() : base(0, 59)
    {
        NextUnit = new MinutesUnit { PrevUnit = this };
    }

    public override string AsString()
        => $"{((MinutesUnit)NextUnit!).AsPrefix()}{_value:00}"; // “:” は分の責務
}

分（変更点：Increment は削除、プレフィックスを提供）

internal sealed class MinutesUnit : CalendarUnitBase
{
    public MinutesUnit() : base(0, 59)
    {
        NextUnit = new HoursUnit { PrevUnit = this };
    }

    internal string AsPrefix() => ":"; // 自ユニットの前置記号責務

    public override string AsString()
        => $"{((HoursUnit)NextUnit!).AsPrefix()}{_value:00}";
}

時

internal sealed class HoursUnit : CalendarUnitBase
{
    public HoursUnit() : base(0, 23)
    {
        NextUnit = new DayUnit { PrevUnit = this };
    }

    internal string AsPrefix() => " ";

    public override string AsString()
        => $"{((DayUnit)NextUnit!).AsPrefix()}{_value:00}";
}

日（最大値は外部（=月）から与えられる。自分は共通Incrementを使うだけ）

internal sealed class DayUnit : CalendarUnitBase
{
    public DayUnit() : base(1, 31) { /* 初期最大は仮。月側がSetEndで調整 */ }

    internal string AsPrefix() => "-";

    public override string AsString()
        => $"{((MonthUnit)NextUnit!).AsPrefix()}{_value:00}";
}

月（ここが可変範囲の司令塔。OnValueChanged/OnOverflowedToNextで日数上限を更新）

internal sealed class MonthUnit : CalendarUnitBase
{
    public MonthUnit() : base(1, 12)
    {
        NextUnit = new YearUnit { PrevUnit = this };
    }

    internal string AsPrefix() => "-";

    public override string AsString()
        => $"{((YearUnit)NextUnit!).AsPrefix()}{_value:00}";

    protected override void OnValueChanged()
        => UpdateDayEnd();

    protected override void OnOverflowedToNext()
        => UpdateDayEnd();

    private void UpdateDayEnd()
    {
        if (PrevUnit is DayUnit day && NextUnit is YearUnit y)
        {
            int days = DaysInMonth((int)y.Value, (int)_value);
            day.SetEnd(days);
        }
    }

    private static int DaysInMonth(int year, int month)
    {
        switch (month)
        {
            case 2: return IsLeapYear(year) ? 29 : 28;
            case 4:
            case 6:
            case 9:
            case 11: return 30;
            default: return 31;
        }
    }

    private static bool IsLeapYear(int year)
        => (year % 400 == 0) || (year % 4 == 0 && year % 100 != 0);
}

年

internal sealed class YearUnit : CalendarUnitBase
{
    public YearUnit() : base(1, 9999) { }

    internal string AsPrefix() => ""; // 年は先頭

    public override string AsString()
        => $"{_value:0000}";
}

連結は Year → Month → Day → Hour → Minute → Second の AsString() チェーンで完成します。
例："0001-01-01 00:00:00"

---

1. 使い方（変わらず）
   ============

var seconds = new ConsoleApp4.CalendarUnits.SecondsUnit();
Console.WriteLine(seconds.AsString()); // 0001-01-01 00:00:00
seconds.Increment(59);
Console.WriteLine(seconds.AsString()); // 0001-01-01 00:00:59
seconds.Increment();                   // 分に繰り上げ
Console.WriteLine(seconds.AsString()); // 0001-01-01 00:01:00

---

1. なぜこの設計？
   ==========

• Increment() の重複実装を廃止 → バグの温床（繰り上げ漏れ）を閉じる

• 変動範囲（Day）も、範囲の更新責務をMonth側に寄せることで共通ロジックを壊さない

• フックを2つ用意

  • OnValueChanged()：自ユニットの値が変わるたび

  • OnOverflowedToNext()：上位にキャリーした直後
    → 可読性と最小副作用点の確保

---

1. コンプライアンスレポート（SOLID）
   ======================

• S：各クラスは「自桁の表現と範囲責務」に限定。Increment()は基底へ集約

• O：ユニット追加は派生クラスで OK。既存の基底を変更せずに拡張可能

• L：すべて CalendarUnitBase の契約内で置換可能

• I：INextUnit/IPrevUnit 程度の粒度で十分。今回の変更で新規IFは不要

• D：Month→Year の参照は具体型（YearUnit）に触れている点が軽微に残存

  • 理由：既存構造を壊さず最小変更で年情報にアクセスするため

  • 緩和策：IYearInfo { int Year {get;} } を導入し、NextUnit as IYearInfo に置き換え

結論：上記の軽微なDIP懸念を除き、すべてのSOLID原則は維持されています。

---

1. バグ・ロジックレビュー & セルフプロンプト
   =========================

• オフバイワン/繰り上げ漏れ

  • 共通化で解消。

  • セルフプロンプト：「境界は inclusive で統一され、繰り上げ時に +1 を正しく差し引いているか？」

• 不要/重複実装

  • 各派生の Increment() を削除。

  • セルフプロンプト：「派生の Increment() が残っていないか？差分は本当に必要か？」

• パフォーマンス（巨大ループ）

  • delta まとめ進めで高速化。ただし日数可変でも正しく動くよう “境界まで→繰り上げ” で処理。

  • セルフプロンプト：「delta が大でも while の回数は繰り上げ回数に比例しているか？」

• 命名/可読性

  • フック名を明確化。

  • セルフプロンプト：「副作用は OnValueChanged/OnOverflowedToNext のどちらに置くのが正しいか？」

その他の指摘事項はありません。

---

1. 追加リファクタ提案 & セルフプロンプト
   =======================

1. DIP厳格化：IYearInfo/IMonthInfo を導入し、MonthUnit は抽象に依存

   • セルフプロンプト：「具体型キャストを排除できる最小のIFは何か？」

2. 表示ポリシー分離：ICalendarFormatter（Strategy）で AsString() を外出し

   • セルフプロンプト：「連結規則を差し替えたい時、派生を増やさず切り替え可能か？」

3. 負方向Decrement()の対称実装（必要なら）

   • セルフプロンプト：「delta<0 を要求された時、共通ロジックを対称に書けるか？」

---

この方向でいけば、Increment() は完全に基底一箇所になり、派生側はビジネスルール（可変範囲の調整や表示）だけに集中できます。欲しければ IYearInfo 化まで一気にやる版も出します。

cozyupk

Increment() が public かつ virtual って気持ち悪いね。public 実装を持つのは SecondsUnit だけにしたいな。

ChatGPT(GPT-5)

なるほど！確かに「誰からでも叩ける public virtual Increment()」は、YearUnit や MonthUnit にまで出てしまって不自然ですね。
本来「外部から増分を呼ぶ権利があるのは**一番下位の桁（秒）**だけ」で、上位桁は内部的に呼ばれるだけの存在にしたい。

---

改善案：protected internal + sealed + テンプレート分離

1. 基底クラス側

• IncrementCore() を protected internal virtual にする

• 外部公開の Increment() は 持たない

• 上位クラスから呼ぶときだけ使える

public abstract class CalendarUnitBase : INextUnit, IPrevUnit
{
    protected long _value;
    protected long _start;
    protected long _end;

    public INextUnit? NextUnit { get; set; }
    public IPrevUnit? PrevUnit { get; set; }

    protected CalendarUnitBase(long start, long end)
    {
        _start = start;
        _end = end;
        _value = start;
    }

    public virtual void SetEnd(long endInclusive)
    {
        _end = endInclusive;
        if (_value > _end) _value = _end;
    }

    /// <summary>
    /// 内部専用の増分処理（外部からは SecondsUnit 経由でしか呼ばれない）
    /// </summary>
    protected internal virtual void IncrementCore(long delta = 1)
    {
        while (delta > 0)
        {
            long stepToBoundary = _end - _value;
            if (stepToBoundary >= delta)
            {
                _value += delta;
                OnValueChanged();
                break;
            }

            _value = _end;
            OnValueChanged();
            NextUnit?.IncrementCore(1); // 内部経由で上位を繰り上げ
            _value = _start;
            OnOverflowedToNext();
            delta -= (stepToBoundary + 1);
        }
    }

    public abstract string AsString();
    protected virtual void OnOverflowedToNext() { }
    protected virtual void OnValueChanged() { }
}

---

2. SecondsUnit 側

• 唯一の外部 API として public void Increment() を提供

• 内部的には IncrementCore を呼ぶだけ

internal sealed class SecondsUnit : CalendarUnitBase
{
    public SecondsUnit() : base(0, 59)
    {
        NextUnit = new MinutesUnit { PrevUnit = this };
    }

    /// <summary>
    /// 外部から呼べる唯一の増分エントリポイント
    /// </summary>
    public void Increment(long delta = 1) => IncrementCore(delta);

    public override string AsString()
        => $"{((MinutesUnit)NextUnit!).AsPrefix()}{_value:00}";
}

---

3. 上位ユニット（MinutesUnit など）

• 外部には公開せず、IncrementCore のみを継承

• 派生クラスからはオーバーライド可能（例: MonthUnit → DayUnit.End 更新）

internal sealed class MinutesUnit : CalendarUnitBase
{
    public MinutesUnit() : base(0, 59)
    {
        NextUnit = new HoursUnit { PrevUnit = this };
    }

    internal string AsPrefix() => ":";
    public override string AsString()
        => $"{((HoursUnit)NextUnit!).AsPrefix()}{_value:00}";
}

---

メリット

• 外部APIがシンプル

  • seconds.Increment() だけを公開

  • 他の桁は内部専用 (protected internal IncrementCore)

• 誤用を防ぐ

  • 開発者が month.Increment() とか year.Increment() を直叩きできない

• 継承の自由度は確保

  • MonthUnit は IncrementCore をオーバーライドして日数調整可能

---

セルフプロンプト（設計チェック用）

• 「外部から呼べるメソッドは本当に必要なものだけに限定されているか？」

• 「下位桁以外のユニットに外部公開の Increment() が存在していないか？」

• 「内部連鎖呼び出しは IncrementCore を経由し、責務が分離されているか？」

---

👉 この方向でまとめて 外部公開を SecondsUnit に限定するのが自然だと思いますが、どうします？ public Increment() を 完全に削除して、SecondsUnit にだけ生やす形で zip 更新してみましょうか？

本日のまとめ

GPT君がまとめてくれるそうです:

OCPを“人間が設計”→“AIが肉付け”する流れで試したら、ちゃんとHello World級の拡張が成立した。 つまり、生成AI時代にこそ OCPが“生き残り戦略”として光る ——そんな実験結果でした。

こいつ、俺の生き残り戦略に関して語ってくるとは・・・
（まあいいんだけどさw）

おしまい

8/17 8:00 AM
ソースコードに不具合があったため Github 側修正。
そういったケースにも対応するため記事内プロンプト更新。
プロンプト実施結果と会話例を追記。

8/18追記

なんか Copilot 君が要約してくれてるけど・・・

「OCPバイブコーディングってなに？」（以下返答抜粋）

「OCPバイブコーディングを使った具体例は？」（以下返答抜粋）

そうだね！そうそう！きっとCopilot君との相性も抜群だよね！

まだ試してないけどねw こんどね。きっとね！

8/23追記: 本記事の続編を公開しました。