From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-03-28T17:35:44+09:00
Subject: Re: Conditionally make a method private?

On Fri, Mar 28, 2003 at 11:35:56AM +0900, Jeremy wrote:
> Mauricio Fern�ndez wrote:
> 
> > On Thu, Mar 27, 2003 at 10:50:44AM +0900, Jeremy wrote:
> >> dblack@superlink.net wrote:
> >> Actually, if I understand what you are saying, this is EXACTLY what I
> >> want. What I was trying to accomplish was having an attribute that wasn't
> >> quite
> >> global, but more accessable than just a normal class attribute.  I do
> >> want
> > 
> > But in a way it *is* global, as there's only one class attribute, it is
> > simply scoped into that class. Every pair of database/menu objects will
> > be using the same attribute.
> 
> True.  And that's pretty much what I need.  One to be shared among all, (as
> opposed to each pair sharing their own) but only among all specified
> objects.  There are other objects, such as books, teachers, and such, that
> do not (and should not) need access to this.  Also, this was a simplified
> example.  Yes, here I did have just one class attribute in use, but in
> actuality, there are several in use that are all being processed in one way
> or another.
> 
> > 
> > If all you want is to share some part of the internal state, you can
> > simply externalize it as a separate object and keep as many references as
> > needed.
> 
> Externalize?  I'm not sure exactly how you mean this.  Are you talking about
> releasing the information as some global object?  Or am I just way off
> here...?

Just that :)
One last thing though: you should probably pass references around
instead of simply using a global (even if they all come from, say,
GlobalState.instance), for this way you'll be able to change associations
easily in the future...

ie.

class Foo
  def initialize( ... state )
     @state = state
  end
  def foo
     #use @state
  end 
end

instead of "hardwiring"
class Foo

  def foo
     #use $state
  end
end


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