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Rubyのクラスにおいてインスタンス変数のスコープや暮らす変数の挙動について
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Rubyの継承について
1.
Ruby の継承について
2.
1. インスタンス変数 ・「@」を付けて宣言 ・スコープはプライベート ※ ただしJavaで言う所の
protectedに近い
3.
1. インスタンス変数 サブクラス内からアクセス可能
4.
2. クラス変数 ・「@@」を付けて宣言 ・スコープはプライベート ・全てのサブクラスで「共有」 ※ ただしJavaで言う所の
protectedに近い
5.
class Base @@name =
‘base’ def name puts @@name end end class User < Base @@name = ‘user’ end classTweet < Base @@name = ‘tweet’ end
6.
実行結果
7.
3. クラスインスタンス変数 ・「@」を付けて宣言 ・スコープは private ・宣言したクラス内でのみ利用可能 ※
ただしJavaで言う所の protectedに近い
8.
クラス変数として利用出来る 3. クラスインスタンス変数 Javaで言う所の
9.
4. privateメソッド ・Java の
protected に近い ・レシーバを指定せずに呼び出す
10.
5. protecedメソッド ・Java の
protected に近い ・レシーバは self のみ
11.
結論 Ruby で継承はツライ
12.
結論 ・ private が
private じゃない ・予期せぬ Override
13.
解決方法
14.
解決方法 継承よりも コンポジション(委譲)
15.
class Base @@name =
‘base’ def name puts @@name end end class User def initialize @base = Base.new(‘user’) end def name @base.name end end
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