From: Paul Brannan <paul@...>
Date: 2002-02-14T01:26:36+09:00
Subject: Re: qualms about respond_to? idiom

On Thu, Feb 14, 2002 at 01:11:39AM +0900, Dave Thomas wrote:
> start tags would have
> 
>    def handle_stack(stack)
>       stack.push(name)
>    end

Does this really belong in the stream object itself?  Should a tag have
to have knowledge of how the data structure it is being put into
operates?  What if I wanted to create a binary tree of tags and other
stream elements; should I then have a handle_binary_tree method in all
my stream objects?

Using your solution seems nice, since it means that the dispatcher needs
less knowledge about the objects it is handling, but it means that the
objects need more knowledge about the dispatcher.  Is there a good way
around this tradeoff?

Paul