From: "Christoph R." <chr_news@...>
Date: 2003-09-18T00:15:37+09:00
Subject: Re: hash default value

dblack@superlink.net wrote:

....
>>i expected that myOtherHash would be {"blue"=>{"red"=>1}}
> 
> 
> No, there's no autovivification in the Perl manner :-)

This not quiet true (for 1.8) - see Guy's post. If you
want full  autovivification your best bet is to sub-class
Hash

---
class AutoVHash < Hash
	def initialize
	end
	def default(key)
		self[key] = self.class.new
	end
end

autovhsh = AutoVHash.new

autovhsh[1][2][3] = 4
p  autovhsh[1][2][3]  # => 4
---

or if you like puzzles

---
body = proc {|hsh,key| hsh[key] = Hash.new &body }
autovhsh = Hash.new &body

autovhsh[1][2][3] = 4
p  autovhsh[1][2][3]  # => 4
---


/Christoph