From: Eugene Ventimiglia <eventi@...>
Date: 2001-02-28T23:34:01+09:00
Subject: [ruby-talk:11774] Re: How do I reach members from a Proc?


Thank you:

This belongs in the Garden!  Is there a way to plant it now?
	--e

> -----Original Message-----
> From: dave@thomases.com [mailto:dave@thomases.com]On Behalf Of Dave
> Thomas
> Sent: Wednesday, February 28, 2001 12:56 AM
> To: ruby-talk ML; ruby-talk@netlab.co.jp
> Subject: [ruby-talk:11748] Re: How do I reach members from a Proc?
> 
> 
> "Eugene Ventimiglia" <eventi@nyic.com> writes:
> 
> > Here's a reduced version of what I'm trying to do:
> 
> 
>  class Hello
>   def install(&p)
>    @action=p
>   end
>   def do
> #   @action.call
>     instance_eval(&@action) #<<<
>   end
>   def help
>    puts "in help"
>   end
>  end
>  
>  h=Hello.new
>  h.install {
>   puts "in proc"
>   help
>  }
>  h.do
> 
> 
> 'instance_eval' effectively evaluates the block in the context of its
> receiver (in this case 'h'). Without it, the block is run in it's
> original context.
> 
> (http://www.rubycentral.com/book/ref_c_object.html#instance_eval)
> 
> 
> Regards
> 
> 
> 
> Dave
>