From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-10-21T17:06:08+09:00
Subject: Re: scope when reopening method

On Thu, Oct 21, 2010 at 9:23 AM, Rahul Kumar <sentinel1879@gmail.com> wrote:
> Here is a dummy class with a method "meth".
>
>   class My
>
>      # str contains some value generated by My
>      def meth str
>      end
>
>      def call_meth
>         meth "abc"
>      end
>   end
>
>
>   # ------ my application starts here
>
>   arr = []
>
>   m = My.new
>   def m.meth(str)
>     # access some other object in application scope
>     arr << str
>     do_something str # call some method in my app
>   end
>
> I have the method "meth" above which is of interest to user apps.
> The app overrides the method and would like to access methods or
> variables
> in my application scope.
>
> Is there anyway this is possible (other than using global variables) ?
> To me it appears that meth() can only access what is in that objects
> scope plus globals. thx.

If I understand correctly, you want the meth method defined for object
a to be able to access methods and instance variables defined in the
My class. Nothing special needs to be done:

irb(main):001:0> class My
irb(main):002:1> def initialize
irb(main):003:2> @value = 3
irb(main):004:2> end
irb(main):005:1> def do_something
irb(main):006:2> puts "my value is #{@value}"
irb(main):007:2> end
irb(main):008:1> def call_meth
irb(main):009:2> meth "abc"
irb(main):010:2> end
irb(main):011:1> def meth str
irb(main):012:2> str * 2
irb(main):013:2> end
irb(main):014:1> end
=> nil
irb(main):015:0> My.new.call_meth
=> "abcabc"
irb(main):016:0> a = My.new
irb(main):025:0> def a.meth str
irb(main):026:1> do_something
irb(main):027:1> str + @value.to_s
irb(main):028:1> end
=> nil
irb(main):029:0> a.call_meth
my value is 3
=> "abc3"

Maybe I misunderstood the question.

Jesus.