From: matz@... (Yukihiro Matsumoto)
Date: 1999-02-25T14:38:00+09:00
Subject: [ruby-dev:5669] Re: Hash.new

まつもと ゆきひろです

In message "[ruby-dev:5667] Re: Hash.new"
    on 99/02/25, Yukihiro Matsumoto <matz@netlab.co.jp> writes:

|そうですねえ．こんな感じでしょうか．

ちょっと違うか．

|class Hash2<Hash
|  def initialize(ifnone, &block)
|    if ifnone != nil && block != nil
|      raise ArgumentError, "specify either ifnone or block"
|    end
     @block = block
     @ifnone = block || ifnone
|  end
|  def [](key)
     if @ifnone && !self.key?(key)
       if @block
         self[key] = @block.call
       else
         self[key] = @ifnone
       end
|    end
|    super
|  end
|  def default
|    @ifnone
|  end
|end