From: chr_rippel@... (Christoph)
Date: 2002-03-28T07:39:50+09:00
Subject: RE: Hash.new(Hash.new) doesn't use Hash.new as default value

> From: Yukihiro Matsumoto
...
> |Rather than have the block simply return a default value, give it
> |enough context to let it assign that value or not:
> |
> |  h = Hash.new { 0 }    # simply return 0, do not alter the hash
> |
> |  h = Hash.new { |hash, key| hash[key] = Hash.new } # put a new hash
> |                                                    # in place
> |
> |That gives control back to the developer.
> 
> Fortunately, it already works exactly you described.

I thought that the ``hash'' argument was pretty much superfluous - guess
I was wrong.  Here is a working n-dimensional solution cvs-solution
which is strictly relying on the apparent useless hash parameter

----
default = nil
default = proc do |hash, key| hash[key] = Hash.new default  end

var = Hash.new (&default)
----

/Christopc