From: Caleb Clausen <vikkous@...>
Date: 2006-02-26T15:04:24+09:00
Subject: Re: BlankSlate for lazy.rb (Was: Re: lazy.rb 0.9.5 -- transparent futures!)

On 2/25/06, MenTaLguY <mental@rydia.net> wrote:
> Hmm.  Okay, for lazy.rb there are a couple things I would need from
> BlankSlate:
>
>  - the ability to "let through" a few additional methods
>    (just Object#class at the moment, but there may be more later)
>
>  - to be able to hide Object#instance_eval

I have a rather mutated version of BlankSlate (as a module) which
supports both of these.
You can use it something like this:

class Foo
  include BlankSlate
  hide :instance_eval
  restore :class
end

Foo.new.instance_eval{}  #=> raises NoMethodError
Foo.new.class                #=> Foo

Is there any chance these features could be included in the gem? I'd
love to use it myself, but I need my various changes to it too.

Here's the code:


  module BlankSlate
    module ClassMethods
      def restore(*names)
        names.each{|name| alias_method name, "##{name}"}
      end
      def hide(*names)
        names.each do|name|
          undef_method name  if instance_methods.include?(name.to_s)
        end
      end
    end

    def BlankSlate.included(othermod)
      othermod.instance_eval {
        instance_methods.each { |m|
          #nothing is thrown away forever, just renamed in a strange way
          alias_method "##{m}", m #archive m
          undef_method m unless m =~ /^__/ || m=='instance_eval'
        }
        extend BlankSlate::ClassMethods
      }
    end
  end