From: gabriele renzi <surrender_it@...>
Date: 2005-12-10T06:27:38+09:00
Subject: Re: next, retry, break?

mental@rydia.net ha scritto:
> Okay, I've got a question.
> 
> What's the correct way to implement a custom Enumerable#each which
> handles next, retry and break correctly?
> 
> For example:
> 
>  def each
>    while @current_grob
>      yield @current_grob.create
>      @current_grob = @current_grob.next_grob
>    end
>  end
> 
> How do I make next, retry, and break work as expected?
> 
> -mental

don't they do it already?
 >> Triple = Struct.new :a, :b, :c do
?>   def each
 >>    yield a
 >>    yield b
 >>    yield c
 >>   end
 >> end
=> Triple
 >> Triple.new(1,2,3).each do |x|
?>   if x == 1
 >>    next
 >>   elsif x == 2
 >>     p "2"
 >>     break
 >>   end
 >>   p x
 >> end
"2"
=> nil