Design Patter by PHP[2]: Adapter

Date: 2006-10-16 (Mon)
Category: Design Pattern | Tech | php

前回のイテレータパターンからはだいぶ時間が空いてしまいました。本を友人に貸していたからなんですが、まぁ言い訳はこのくらいにして。

未だ Chpater 2: Adapter Pattern です。今回からは（昨日から運用開始した）Subversion を使ってレポジトリを公開〜。まだ非常に稚拙なコードですが、興味のある人は、

http://svn.nydd.org/dpxphp/

をどうぞ。

今回の気づき

Java の super() は PHP で parent:: となる。
- PHP4 では class 名と同じ function がコンストラクタに、いわゆる Java と同じ形式だけだったのに、PHP5 から Object に __construct() という特殊関数ができて、誰が使うんだろーなー、と正直思っていたけれど、なるほど確かに parent::__construct() を呼ぶのに、統一的かつ合理的にするには __construct() を使うべきだと思いました。ちなみにマニュアルにはこう書いてあります。
  For backwards compatibility, if PHP 5 cannot find a __construct() function for a given class, it will search for the old-style constructor function, by the name of the class. Effectively, it means that the only case that would have compatibility issues is if the class had a method named __construct() which was used for different semantics.
  実際実験してみましたが、__construct() を class 宣言の中に含めなくても parent::__construct() で呼び出すことができています。
PHP とは関係なく、svnX の使い勝手の問題なんですが、Working Copies ウィンドウから開けるところで、Update ボタンを押すと、"Are you sure you want to update this working copy to the latest revision?" って聞いてくれるのだけれども、Yes を押すと、どれが変わるとかは言ってくれないで、黙ってアップデートされてるのがすこし気になった。

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