ruby-dev

けいじゅ＠日本ラショナルソフトウェアです.

In [ruby-dev :00285 ] the message: "[ruby-dev:285] Re: [BUG] MLF ", on
Aug/27 18:33(JST) matz@netlab.co.jp (Yukihiro Matsumoto) writes:

>まつもと ゆきひろです

>|>ここで定義したfailはException2MessageMapperの特異メソッドに
>|>なります．
>|>
>|>	public :fail
>|>
>|>ここでpublicにするfailはObject#failです．ですから，
>|
>|え? 何でそうなるんですか? 良く理解できないんですが...
>
>なんでわかんないかな？

だってぇ....

>  Module#module_evalの中でのdefはそのモジュール(あるいはクラ
>  ス)にメソッドを定義しますが，Object#instane_evalの中での
>  defはそのオブジェクトの特異メソッドを定義します．

>  ですから，module_evalを使った時とinstance_evalを使った時と
>  ではdefによるメソッドの定義先が明らかに異なるわけですね．

そうですね. ここまではOK.

>  一方，どちらでもselfはそのクラスですから，同じpublicメソッ
>  ドが起動されます．Module#publicはそのモジュール(またはクラ
>  ス)のメソッド(特異メソッドではない)をpublicにしますから，
>  instance_evalを使った場合，(Exception2MessageMapperでは
>  failが定義されていないので，クラス階層を遡って)Object#fail
>  をpublicにします．module_evalを使った場合にはfailが
>  Exception2MessageMapperで定義されていますから，そのメソッ
>  ドをpublicにします．

うーん. なるほどぅ... 

  class << Exception2MessageMapper
    public :XX
  end

が必要になるんですね...

object.instance_eval ... と class << object って定義に関しては同じ動作
なのに, 変数のアクセスに関しては違ってくるんですね...

>という説明でわかりますか？

どもでした(__;;;

# 勉強になりました.

__
................................石塚 圭樹＠日本ラショナルソフトェア...
----------------------------------->> e-mail: keiju@bc.mbn.or.jp <<---

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[ruby-dev:286] Re: [BUG] MLF

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