From: Christoph <chr_news@...>
Date: 2002-04-13T14:59:02+09:00
Subject: Re: Rudy idiom for enumeranting parents of a node?

"Pete McBreen" <pete@mcbreen.ab.ca> wrote in
....
>
> I though that this one would be easy to answer until I realized that
> although there is a #block_given? method I don't know how to refer to an
> anonymous given block. A very crude hack is to say
>
> class Node
>   def initialize(parent, children=[])
>    @parent = parent
>    @children = children
>    @children.each { |child| child.parent(self) }
>  end
>  def parents (*unused_args, &block)
>    @parent.parents &block unless @parent.nil?
>    yield self
>   end

def parents
    @parent.parents {|x| yield x } unless @parent.nil?
    yield self
end

>
....

/Christoph