From: Daniel Sheppard <daniels@...>
Date: 2005-12-01T09:37:31+09:00
Subject: Re: Point an element in Hash Object

I thought something like this was in facets... maybe it was one of those
other library collections... either way I can't find what I'm looking
for, so here's an implementation which probably screws up with some
corner cases.

class Reference
    instance_methods.each { |m| undef_method m unless /__.*__/ === m}
    def initialize(&block)
        @block = block
    end 
    def method_missing(*args, &block)
        @block.call.send(*args, &block)
    end
end

my_hash = {}
my_hash["one"] = "First"
my_hash["two"] = "Second"
my_hash["three"] = "Third"
my_hash["four"] = Reference.new{my_hash["one"]}
my_hash["five"] = Reference.new{my_hash["four"]}

my_hash["one"] = "Modify"
p my_hash["four"]
=> "Modify"
p my_hash["five"]
=> "Modify"


> -----Original Message-----
> From: list-bounce@example.com 
> [mailto:list-bounce@example.com] On Behalf Of Andrew
> Sent: Thursday, 1 December 2005 9:06 AM
> To: ruby-talk ML
> Subject: Point an element in Hash Object
> 
> I'm trying to create an hash object using object string for 
> key and value.
> I need to link a key with another key as value... so an 
> element of hash object can  point to another element. But i 
> need the link to the key and not a copy of the value.

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