ruby-dev

まつもと ゆきひろです

In message "[ruby-dev:207] Re: Class#eval [Re: ftplib.rb revision 1.4]"
    on 97/08/22, 石塚圭樹 <keiju@bc.mbn.or.jp> writes:

|けいじゅ＠日本ラショナルです.

|>こっちは良いんですよ．コストだけでメリットがはっきりしてます
|>から．Module#evalとかModule#includeなどはコストが掛かるし，
|>メリットもはっきりしないんでふんぎりがつかないんですよね．
|
|そうですねえ... メリットの問題もありますけどね. 
|
|# evalを大幅に直すとバグがまた大量発生したりして(^^;;;

それも恐いですし，それにもともとの目的である「eval関数と互換
の機能を呼び出したい」が実現できないと意味が無いので．

|現状だと, Class#evalは
|
|* レシーバの指定がないとObject#evalと同じ動作
|* レシーバの指定があってbindingがないと, レシーバへの登録
|* レシーバの指定があってbindingがあると, Object#evalと同じ動作
|
|になっているんですね?

違います．

* bindingがないと, モジュールのコンテキストでeval
* bindingがあると, Object#evalと同じ動作

です．前にも行ったように現状のrubyではレシーバの指定があるか
ないかで挙動を変えることは出来ません．privateにすることは出
来ますけど．

|いっそのこと, 名前を変えた方がいいのかな? 
|
|Object#eval(source, binding)
|Class#class_eval(source)
|Object#single_eval(source)
|
|と.

まあ，それが一番確実な手なんですけど．いろいろ考えて決めるこ
とにしましょう．

                                まつもと ゆきひろ /:|)

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[ruby-dev:209] Re: Class#eval [Re: ftplib.rb revision 1.4]

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

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