From: "Carlo E. Prelz" <fluido@...>
Date: 2013-02-03T18:43:42+09:00
Subject: Re: Storing string-data in a module

	Subject: Storing string-data in a module
	Date: dom 03 feb 13 06:12:20 +0900

Quoting Marc Heiler (lists@ruby-forum.com):

> Now, however, I _also_ want to be able to store
> this in the module. But how can I do this?

I might be mistaken, but I believe you cannot. There are global
variables (prepended by '$'), class variables (prepended by '@@') and
instance variables (prepended by '@'). But there are, to my knowledge,
no module variables. And this is exactly why modules are more
flexible: they provide methods, but they do not provide instantiation
or storage. From what I know, a module can only own constants
(immutable).

I believe this boils down to the usual multiple-inheritance-related
class of FAQ's. IMO, Ruby's designers have decided to avoid multiple
inheritance not because it is evil, but because the sheer amount of
unescapable, tangled complexity brought in *at language implementation
level* by multiple inheritance would produce a clumsier language as a
whole. I back their decision single-heartedly.

If I were facing your problem, I would pass the string as the first
parameter to all functions in the module, like this:

    def one(string,i='')
      string+='<'+i+'>'
    end

You can directly use the instance's variable, like this:

    def one(i = '')
      @string+='<'+i+'>'
    end

@string would be owned by the instance of each class that included
your module. But I think this last way obfuscates things a bit too
much. 

Carlo

-- 
  *         Se la Strada e la sua Virtu' non fossero state messe da parte,
* K * Carlo E. Prelz - fluido@fluido.as             che bisogno ci sarebbe
  *               di parlare tanto di amore e di rettitudine? (Chuang-Tzu)