From: Daniel Berger <Daniel.Berger@...>
Date: 2006-02-09T08:20:21+09:00
Subject: Re: [ ruby-Bugs-3506 ] Set containing duplicates

noreply@rubyforge.org wrote:
> Bugs item #3506, was opened at 2006-02-08 22:52
> You can respond by visiting: 
> http://rubyforge.org/tracker/?func=detail&atid=1698&aid=3506&group_id=426
> 
> Category: Core
> Group: None
> Status: Open
> Resolution: None
> Priority: 3
> Submitted By: Stefan Rusterholz (rstefan)
> Assigned to: Nobody (None)
> Summary: Set containing duplicates
> 
> Initial Comment:
> If an object added to a set becomes modified and added again it will be in the set twice.
> A fix to this would be to add "@hash.rehash" in "def add(o)" and "def merge(enum)". Though this might minder the speed advantage of set.
> OTOH Set becomes quite useless if it is impossible to add without checking first if the element already contained.

I don't see it:

require "set"

x = "foo"

set = Set[x,"bar","baz","foo"]
p set # #<Set: {"baz", "foo", "bar"}>

set.add("foo")
p set # #<Set: {"baz", "foo", "bar"}>

x.chomp!
set.add(x)
p set ##<Set: {"baz", "foo", "bar"}>

Can anyone demonstrate the bug he is referring to?

- Dan