From: Florian Gross <flgr@...>
Date: 2004-06-18T23:28:21+09:00
Subject: Re: How to make generic #== method?

Moin!

Joel VanderWerf wrote:

> module ContentEquality
>   def hash
>     content.hash
>   end
> 
>   def eql?(other)
>     content.eql? other.content
>   end
> 
>   def ==(other)
>     # self.class == other.class and # optional
>     content == other.content
>   end
> end

That's cool, I think I'm going to use it in the future! :)

> Another way might be to iterate over a list of instance variables (or 
> all of 'em, if that's what you want).

Hm, maybe a default .content could be provided by the module; it could 
look like this:

module ContentEquality
   def content
     instance_variables.map { |name| instance_variable_get(name) }
   end
end

Regards,
Florian Gross