From: Radek Skokan <radek.skokan.conf@...>
Date: 2006-04-11T19:28:51+09:00
Subject: Duplicity in Set

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Hello,

I have a Set which should contains elements of my object Component. The
component class implements method hash. I'm gathering data, createing
Componets from them and storing it into the Set. It's a Set just to prevent
duplicates. But finally the Set contains duplicate elemets -- with the same
hash value.

Few snippets from the code:

$components =3D Set.new        # declaration of the Set variable
.... then some addings to $components ...
$components.each {|c| puts(c.name + ', class:' + c.class.name + ', hash:' +
c.hash.to_s)}

And it prints:

OR-copm2.2, class:Component, hash:304328379
OR-copm2.2, class:Component, hash:304328379

The Component class is defined in this way:

Class Component
    attr_reader :attributes, :name, :subcomponents
    attr_writer :attributes # array of Attribute objects

    def assembly?
        @subcomponents.length !=3D 0
    end

    def object_id
        @name.object_id
    end

    def hash
        @name.hash
    end

    def initialize(name)
        @name =3D name
        @attributes =3D Hash.new
        @subcomponents =3D Array.new
    end
end

What am I doing wrong?

Thanks,
Radek

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