ruby-dev

At Thu, 14 Sep 2000 12:57:18 +0900,
matz@zetabits.com (Yukihiro Matsumoto) wrote:
> 
> |> # 親クラスで先に使う。
> |> class A
> |>   @@c='A'
> |>   C='A'
> |> end
> |> class B<A
> |>   @@c='B' # Aの@@cになる。
> |>   C='B'
> |> end
> |class C<A
> |  p @@c   #=> "B"
> |end
> |
> |これ、ちょっと驚きが多くないですかね？個人的には "A"を期待してしまうので
> |すが‥。
> 
> クラス変数ってのはアクセス範囲を限定したグローバル変数に過ぎ
> ず、でclass Bの定義の中で「代入」しているので"B"なのは当然だ
> と思いますが。驚くと言うのは定数と勘違いしているのでは。
> 
> 驚かない仕様があると言うのであれば、是非聞きたいです。

%rubyでいろいろばかな事を言ってたんですが、copy on writeな物が欲いのかも
しれません。「子供で書き変えた時点で親クラスから独立するクラス変数」

shellの environment variableとかも子供の変更は親には伝わらないですよね？

他の言語での「クラス変数」を知らないので、一般的な事を分ってないからなの
かもしれませんが、「クラス変数」と言う名前から勝手にそういう物だと思いこ
んでたみたいです。
--
        yashi

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