ruby-dev

まつもと ゆきひろです

In message "[ruby-dev:328] Re: virtual class [Re: [Q] [Re: [BUG] method index] ]"
    on 97/08/29, 石塚圭樹 <keiju@bc.mbn.or.jp> writes:

|けいじゅ＠日本ラショナルソフトウェアです.

|>つまり同じオブジェクトに対して2回以上仮想クラスを生成したと
|>して，前回設定した定数やインスタンス変数が残っていることは保
|>証しない(現在の実装では残っているけど)ということで良いですか？
|
|いえいえ. インスタンス変数は保証しないが, クラス定数は保証して欲しいん
|ですけど... 

そうなんですか？ まあ，現状では沿うなっているんで構わないと
言えば構わないんですが．

|インスタンス変数はclass<<の中でしかアクセスできないので, 別のclass<<で
|値が変わっても変ではないですが(変数の連続性がない), クラス定数はインス
|タンスから常にアクセスできますので(変数の連続性がある), class<<毎に値
|が変わるってのも変ですよね?

クラス定数も class << から end までの間でしか参照できません
けど．あれ，もしかして

  class << self
    Foo = 25
  end

  def self.foo
    p Foo
  end
  self.foo

で25が参照できると思っておいでですか？ 定数の参照スコープは
もっと静的です．

# 半端に動的ですけど．

|>  $vsave, $VERBOSE = $VERBOSE, FALSE
|>  ..
|>  $VERBOSE = $vsave
|>
|>で囲んでおきましょう．jcode.rbも．
|
|おお. こんな技が... 私も設定しておこう.

例外が発生する可能性がある場合はbegin .. ensure .. endを使う
必要がありますね．
                                まつもと ゆきひろ /:|)

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[#103] Re: tail recursion (Re: LaTeX ruby documents) — keiju@... (石塚圭樹 )

[#104] Re: meta programming features — keiju@... (石塚圭樹 )

[#105] Re: meta programming features — matz@... (Yukihiro Matsumoto)

[#106] Re: tail recursion (Re: LaTeX ruby documents) — matz@... (Yukihiro Matsumoto)

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[#114] Re: meta programming features — matz@... (Yukihiro Matsumoto)

[#115] Re: meta programming features — WATANABE Hirofumi <watanabe@...>

[#116] Re: meta programming features — matz@... (Yukihiro Matsumoto)

[#117] Re: tail recursion (Re: LaTeX ruby documents) — keiju@... (石塚圭樹 )

[#118] Re: [!?] local variable and accessor — keiju@... (石塚圭樹 )

[#121] Re: meta programming features — keiju@... (石塚圭樹 )

[#123] ruby 1.1 alpha0 released — matz@... (Yukihiro Matsumoto)

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[#185] Re: [ruby-list:3720] Re: Class#eval [Re: ftplib.rb revision 1.4] — keiju@... (石塚圭樹 )

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[#288] ruby 1.1 alpha3 released — matz@... (Yukihiro Matsumoto)

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[ruby-dev:329] Re: virtual class [Re: [Q] [Re: [BUG] method index] ]

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[#167] argument default value — shugo@... (前田修吾 / maeda shugo)

[#272] [Bug] default argument value — shugo@... (前田修吾 / maeda shugo)

[#291] illegal here document — shugo@... (前田修吾 / maeda shugo)