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はじめに

移植やってます

init (Python)

class IteratorContextManager(NoOpBaseReader):
    def __init__(self, *args, **kwargs):
        self._func = kwargs.pop('parser_func')
        self._args = args
        self._kwargs = kwargs
        if type(self) == IteratorContextManager:
            self.reset()
        super(IteratorContextManager, self).__init__(*args, **kwargs)

インスタンスを生成されるときに呼び出されます。
しかし、super.__init__ってなかなか凄いですね。

initialize (Ruby)

class A
  def initialize(*args)
    puts "A initialize"
    __init__(args)
  end

  def __init__(*args)
    puts "A __init__" + args.to_s
  end
end

class B < A
  def initialize(*args)
    puts "B initialize"
    __init__(args)
  end

  def __init__(*args)
    puts "B __init__" + args.to_s
    super()
    super
  end
end

b = B.new("instance")
b.__init__("method")

# B initialize
# B __init__[["instance"]]
# A __init__[]
# A __init__[["instance"]]
# B __init__["method"]    
# A __init__[]
# A __init__["method"]   

initializeをprivateからpublicにしようかなとも思いましたが、__init__メソッドを用意して呼び出す形にする予定。

class IteratorContextManager < NoOpBaseReader
  def initialize(*args, **kwargs)
    __init__(args, kwargs)
  end

  def __init__(*args, **kwargs)
    @_func = kwargs.delete('parser_func')
    @_args = args
    @_kwargs = kwargs
    reset() if self.class == IteratorContextManager
    super
  end
end

単一継承かつ引数が同じなので、superでよさそう。

メモ

  • Python の __init__ を学習した
  • 道のりは遠そう
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