ruby-dev

けいじゅ＠日本ラショナルソフトウェアです.

In [ruby-dev :6187 ] the message: "[ruby-dev:6187] Re: Range (Re:
array[last..first] (Re: Subseq of Array)) ", on Mar/10 16:14(JST)
Yukihiro Matsumoto writes:

>まつもと ゆきひろです

すんません. ちゃんとフォローしていなかったもので(__;;;

>|(a..b).step(n)でRangeでなく別のクラスのオブジェクトを生成するというの
>|はどうでしょう?
>
>え，青山案でのstepというのは a..b という範囲から step個おき
>に要素を取り出すイテレータという意味なんではないでしょうか．
>オブジェクトの属性と考えちゃうのもひとつの手なんですが．

そういう意味だったみたいですね.

>現状のRangeの問題は
>
>  始点と終点を必ず含む(長さ0の範囲が不自然)
>  sizeの計算が文字列に対して成立しない
>  uptoに依存している(だめじゃないけど)
>  a..bでa>bの時の長さが0(だめじゃないけど)
>
>ではないかと思ってます．で，始点を含み終点を含まないRangeと
>して原さんの提案された a...b があるわけです．個人的には「悪
>いアイディアじゃないけど，実装が大変だなあ」と思ってます．

組合せも多くなりますしね.
  
  [a, b]
  [a, b)
  (a, b]
  (a, b)

>で，青山さんはそれとは(ある程度)独立に a>b の件について取り
>上げているんだと思います．しかし，最初の青山案には
>
>  a>b の時の Range#size (b-a+1(現状)でも，abs(b-a)+1でもなんか変)
>
>とか，現状との非互換とか気になる点もかなりあります．

こっちの案は完全に取り下げたと思って良いんですね?

>後の青山案 (a..b).step(n) というのはオブジェクトの性質を変えるのかイ
>テレータなのかちょっと読み取れませんでしたが，イテレータなのだとする
>と，それほど悪くないかな，と思います．

そうですね. 

>石塚案はオブジェクトの性質(というかクラス)を変えるもので，組
>合せが増えて私が大変というものですね．いや，別にダメじゃない
>けど．

やはりはまりそうですし(^^;;; 

__
................................石塚 圭樹＠日本ラショナルソフトェア...
----------------------------------->> e-mail: keiju@rational.com <<---

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