ruby-dev

けいじゅ＠日本ラショナルです.

In [ruby-dev :00194 ] the message: "[ruby-dev:194] Re: Class#eval [Re:
ftplib.rb revision 1.4] ", on Aug/20 17:50(JST) matz@netlab.co.jp
(Yukihiro Matsumoto) writes:

>まつもと ゆきひろです

>|>  foo.single_eval ... はfooの特異メソッドを定義します
>|>  Foo.single_eval ... はFooの特異メソッド(クラスメソッド)を定義します

>|クラス定数はどうなるんでしょうか? メソッドの定義と同じくなる?
>
>そうですね．single_evalで定義されたメソッドからしか参照でき
>ない定数になると思います．

こっちは了解しました.

>|>  Foo.eval("...", binding) ≡ eval("...", binding)
>|うーん. それって, Fooを無視しているわけね. 

>ええ．

ですよねえ...

>  eval "...", binding

>で通常のevalが呼び出せることを念頭に置いてのことです．もとも
>とModule#evalとObject#eval(private)の挙動の違いが問題になっ
>ていたわけですから．

そうですね.

>|ローカル変数などのコンテキストはbindingから持ってきて, メソッド定義な
>|どはレシーバ(Foo)に行うのが良いんじゃないか? っていいたかったんです.
>
>まあ，この方がきれいであるのかも知れませんが，実用上あまり重
>要でない機能のためにevalまわりの実装を全書き換えする必要まで
>は無い気がするんですねえ．

そういう話しになるんですか? よくわからん??

Object#eval(private)の定義はそのままで, Class#evalの動作を上記のように
すれば良いと思うのですが? 

確認ですが, 現在予定されているeval関連メソッド

* Object#eval(private)
* Class#eval
* Object#single-eval

の3種なんですよね?

# 何か重大な誤解があるのかな?

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

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