From: "Molitor, Stephen L" <Stephen.L.Molitor@...>
Date: 2006-06-28T01:53:06+09:00
Subject: Re: Speaking of eql? (was: Ruby and Java equality usage)

>>>> "Robert Dober" <robert.dober@gmail.com> writes:

> Note something that's peripherally related to == and eql? is the
> method "hash", which subclasses MUST override if they override eql?
> or == so that the guarantee:
>
>   a.eql?(b) implies a.hash == b.hash
>
> is maintained.

I would reword that slightly.  You should override hash if you eql?.
But not if you only override '==', as '==' is not involved in hashes or
the hash contract.

Steve