From: Garance A Drosehn <drosihn@...>
Date: 2006-03-09T10:24:57+09:00
Subject: Re: globals outside of OO scripting

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On 3/8/06, rtilley <rtilley@vt.edu> wrote:
>
>
> OK, say I have this:
>
>   class Thing
>
>      @@class_var =3D "filename"
>
>      def method
>        @method_var =3D "a_string"
>        ...
>      end
>
>   end
>
> How can I get to these variables outside of the class.


class Thing
   def Thing.get_cvar
      return @@class_var
   end
   def get_mvar
       return @method_var
   end
end

#  Elsewhere in your code:
puts Thing.get_cvar
puts Thing.new.get_mvar
 - - - -
Note that in the case of method-variables, you can use
the even easier shorthand of:

    attr_reader :method_var

and then you'd get the value via:

puts Thing.new.method_var

where '@method_var' would be the name of the instance-
variable whose value will be returned by the method named
'method_var'.

Also note that you may confuse yourself by thinking of
@-variables as "method variables".  They are instance
variables.  The same value is seen by all methods for
any given instance of the class.

--
Garance Alistair Drosehn     =3D             drosihn@gmail.com
Senior Systems Programmer               or   gad@FreeBSD.org
Rensselaer Polytechnic Institute;             Troy, NY;  USA

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