From: Brian Candler <b.candler@...>
Date: 2009-07-23T06:21:54+09:00
Subject: Re: Instantiating classes / sharing data between classes

Trevoke wrote:
> I think this is what I want to do (maybe I'm thinking about it wrong):
> 
> a = Doctor.new
> b = Doctor.new
> 
> I want both 'a' and 'b' to have access to:
> modalities = ['US', 'CR', 'CT', 'MR']

Another option for you:

modalities = ['US', 'CR', 'CT', 'MR']
a = Doctor.new(modalities)
b = Doctor.new(modalities)

i.e. each has an instance variable pointing to the shared object.

If you like this approach, you can take it further - see
http://onestepback.org/index.cgi/Tech/Ruby/DependencyInjectionInRuby.rdoc

Unfortunately, Jim modified his site and didn't carry forward the 
attachment, and so the link to depinj.rb remains sadly dead. I think I 
have a local copy floating around somewhere.
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