From: Avi Bryant <avi@...4.com>
Date: 2001-07-21T10:11:13+09:00
Subject: [ruby-talk:18223] Re: how does hash locate pairs?

On Sat, 21 Jul 2001, Steve Hill wrote:

> Hi,
> in methods such as [], []=, fetch, etc. how does Hash locate a key,
> value pair.
> 
> For example, in 
> 
> h=Hash.new
> h[0]="foo"
> h[1]="bar"
> 
> puts h[0]
> 
> how does the Hash object h locate the appropriate pair.
> 
> I ask this because I am having problems in getting a hash to work when
> the keys are objects that I have created - in this case a Bin_key
> object that holds the endpoints of a bin. I've tried defining a == and
> a <=> method and I'm not getting anywhere. Here is my bin_key object

Anytime you redefine ==, you need to redefine hash such that if a == b,
a.hash == b.hash.