From: Radek Skokan <radek.skokan.conf@...>
Date: 2006-04-11T20:39:28+09:00
Subject: Re: Duplicity in Set

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Thanks Daniel, I omitted the eql?. Now it works.
Radek

On 4/11/06, Daniel Harple <dharple@generalconsumption.org> wrote:
>
> On Apr 11, 2006, at 12:28 PM, Radek Skokan wrote:
>
> > 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.
>
> You must implement #eql? and #hash --
>
> require 'set'
>
> class Component
>    attr_accessor :attributes
>    attr_reader :name, :subcomponents
>    def initialize(name)
>      @name =3D name
>      @attributes =3D {}
>      @subcomponents =3D []
>    end
>    def inspect() %{<%s hash=3D%#x @name=3D%s>} % [self.class.name,
> self.hash, @name.inspect] end
>    def eql?(other) @name.eql?(other.name) end
>    def hash() @name.hash end
> end
>
> components =3D Set.new
> components << Component.new("foo")
> components << Component.new("bar")
> components << Component.new("foo")
> components.each { |c| puts c.inspect }
>
> -- Daniel
>
>

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