ruby-dev

えぐち＠エスアンドイー です。

>>> In message [ruby-dev:7562] Re: NaN#<=>
    On Sun, 8 Aug 1999 19:25:52 +0900, Shugo Maeda <shugo@netlab.co.jp> said:

shugo> 前田です。
shugo> 
shugo> At Sun, 8 Aug 1999 19:13:47 +0900,
shugo> EGUCHI Osamu <eguchi@shizuokanet.ne.jp> wrote:
shugo> > shugo> いっそのこと、NaN.<=>の時点で例外をraiseするというのはいかがでしょう。
shugo> > shugo> # 何かまずいことありますかね。
shugo> > 
shugo> > これは例えば、
shugo> > 
shugo> > 	1.0 <=> NaN
shugo> > 
shugo> > も例外を raise するという事でしょうか？(そうですよね)
shugo> 
shugo> ええ、要は、えぐちさんのパッチでfalseを返しているところを、例外を
shugo> raiseするように変更するという意味です。
shugo> a == b も a > b も a < b もすべて偽になるというのはまさに例外的な
shugo> 状況ですよね。

まさに、その通りですね。

shugo> > ちょっと考えた範囲では、問題なさそうですが、どうなんでしょう、
shugo> > <=> って sort ぐらいしか使い道が思い当たらないけど、
shugo> > 他に影響受ける所がありそうでしょうか？
shugo> 
shugo> どうなんでしょう。

影響を受けるとしたら、いままでも NaN の影響を「比較が正しくない」
という形で受けていたのだから、変更を躊躇する理由はないですね。

	えぐち

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[#7542] Re: [PATCH] for mswin32 final — KIMURA Koichi <kbk@...>

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[#7569] Re: [PATCH] for ruby-1.3.7 (mswin32) — KIMURA Koichi <kbk@...>

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[ruby-dev:7578] Re: NaN#<=>

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[#7544] Re: [PATCH] for mswin32 final — 助田　雅紀 <masaki.suketa@...>