From: Robert Dober <robert.dober@...>
Date: 2010-06-04T18:31:21+09:00
Subject: Re: comparing objects

On Fri, Jun 4, 2010 at 10:16 AM, Marcin Wolski <wolskint@o2.pl> wrote:
> Robert Dober wrote:
>> On Fri, Jun 4, 2010 at 3:41 AM, Marcin Wolski <wolskint@o2.pl> wrote:
>> <snip>
>>> �def ==(other)
>>> �@email == other.email
>>> �end
>> this seems ok
>>>
>>> �alias eql? ==
>>>
>>> �def hash
>>> � �code = 17
>>> � �code = 37*code + @email.hash
>>> end
>>>
>> Are you sure you want to do this? "equal" objects would overwrite each
>> other when used as hash keys. This is normally not a good idea, be
>> sure you really want/need this!
>> R
>
> What would be the other possible solution to this problem? The example
> code will not work without overwritten eql? and hash methods.
> --
> Posted via http://www.ruby-forum.com/.
>
Does it not? Seems to work on my box
class A
  def == other
    true
  end
end # class A

a1 = A::new
a2 = A::new
a3 = A::new

p [a1,a2] & [a1,a3]



-- 
The best way to predict the future is to invent it.
-- Alan Kay