ruby-dev

まつもと ゆきひろです

In message "[ruby-dev:757] Re: The default def. of "hash""
    on 97/10/20, Shin-ichiro HARA <sinara@blade.nagaokaut.ac.jp> writes:

|原です。
|> |def hash; 0; end

|逆に最も効率の悪いハッシュに「なっている」のでは？

むぅ，確かに…．どうしよう．

ちょっと考えてみたのですが，原案(「げんあん」ではなく「はら
あん」)のメリットは

  * eql?だけ定義してhashの再定義を忘れてもなんとか動く

というものですね．このメリットより

  * ユーザ定義のクラスのインスタンスがeql?を再定義しないこと
    には現実的な速度で動作しない

デメリットの方が大きいように思えます．eql?を再定義したら，
hashも書き換えるべし，というのはドキュメントにも載ってるし．

# って書いてたら原さんから自己フォローがあった．

                                まつもと ゆきひろ /:|)

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[ruby-dev:759] Re: The default def. of "hash"

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