From: Albert Wagner <alwagner@...>
Date: 2002-02-17T05:36:29+09:00
Subject: Re: hash as key in hash

On Saturday 16 February 2002 01:11 pm, you wrote:
<snip>
> After going through all this, you might want to extend the Hash class
> and override hash() with these calls:
>
> class HashWhichYouCanReliablyUseAsKeyInAHash < Hash
>         def hash
>                 return sort.to_s
>         end
> end
>
> And create your hash indexes by creating new instances of the new class.

Have I misunderstood something?  It still doesn't work:

class MyHash < Hash

	def hash
		str = ''
		self.sort.each do | k, v | str << (k * v)	end
		str
	end

end

hash_a = MyHash.new
hash_a['a'] = 1
hash_a['b'] = 2
hash_a['c'] = 3

hash_b = MyHash.new
hash_b['c'] = 1
hash_b['b'] = 3

arg_hash = MyHash.new
arg_hash['c'] = 1
arg_hash['b'] = 3

hash = {  hash_a => 1, hash_b => 2}

puts "#{hash_a.hash} is hash of hash_a"		#==>abbccc
puts "#{hash_b.hash} is hash of hash_b"		#==>bbbc
puts "#{arg_hash.hash} is hash of arg_hash"	#==>bbbc

puts "hash.key?(arg_hash) ==> #{hash.key?(arg_hash)}" #==>false


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