From: Brian Candler <b.candler@...>
Date: 2009-01-21T19:47:13+09:00
Subject: Re: Ruby namespace question

Zhao Yi wrote:
> Ryan Davis wrote:
>> On Jan 20, 2009, at 17:11 , Zhao Yi wrote:
>> 
>>> I require two ruby files which include two classes with the same name.
>>> how can I specify which class I use?
>> 
>> class X; end # x.rb
>> class X; end # y.rb
>> 
>> same class, only one to specify. Files mean nothing in ruby, they're
>> just vehicles for the parser.
> 
> For this code:
> 
> require 'x.rb'
> require 'y.rb'
> X.new     #which class it uses, can I specify the class like x.X or y.X?

Nope - there is only one class X. Which file it was (first) defined in 
makes no difference. If you require 'x.rb' first then class X is 
created, and when you require 'y.rb' new methods are added into the 
*same* class.

If you want them to be different, define them in different namespaces. 
This is what Log4r:: does (it refers to the namespace, not the file)

module One; class X; end; end    # x.rb
module Two; class X; end; end    # y.rb

require 'x'
require 'y'
One::X.new   # this is the one defined in x.rb
Two::X.new   # this is the one defined in y.rb
-- 
Posted via http://www.ruby-forum.com/.