From: "David A. Black" <dblack@...>
Date: 2005-11-12T22:32:47+09:00
Subject: Re: Execute block in context of yielding method's module

On Sat, 12 Nov 2005, Trans wrote:

> Mental block. Is there a reasonable way to do this?
>
>  def dothis ; puts "NO!" ; end
>
>  module M
>    class << self
>      def dothis
>        puts "THIS" + @number.to_s
>      end
>      def wrap( n, &yld )
>        old = @number
>        @number = n
>        yld.call
>        @number = old
>      end
>    end
>  end
>
>  M.wrap( 10 ) do
>    dothis
>  end
>
> This produces "NO!". How do I get it to execute the block in the
> context of M, so that it produces "THIS10" (w/o having to out
> M.dothis).

instance_eval is the standard way of changing 'self':

   M.instance_eval { wrap(10) { dothis } }


David

-- 
David A. Black
dblack@wobblini.net