From: Jim Freeze <jim@...>
Date: 2003-05-09T08:37:41+09:00
Subject: Re: Can a global be a constant?

On Friday,  9 May 2003 at  8:23:52 +0900, Hal E. Fulton wrote:
> 
> Not a stupid question... maybe my assumptions
> don't work for you, but what I was thinking 
> was something like:
> 
> class State
>   @@debug = nil
>   @@verbose = nil
> 
>   def State.debug
>     @@debug
>   end
> 
>   def State.debug=(val)
>     @@debug = val
>   end
> 
>   def State.verbose
>     @@verbose
>   end
> 
>   def State.verbose=(val)
>     @@verbose = val
>   end
> 
> class App
>   def main
>     State.debug = true
>     State.verbose = false
>     Work.new
>   end
> end
> 
> class Work
>   def initialize
>     puts State.debug
>   end
> end
> 
> App.new.main
> 
> 
> Hal

Yes. That is the truly global solution. I was
trying to do that but was getting lost somewhere.

Is there a neater (read more concise) way to define State with
maybe a << class_attr_accessor maybe?

A couple of requirements that would be nice:
  1) Only the creator of the state can change it
  2) Classes at most have to do an include to get
     access to the state.

-- 
Jim Freeze
----------
VMS is like a nightmare about RSX-11M.