gistfile1.txt

# see http://blog.jayfields.com/2007/08/ruby-calling-methods-of-specific.html

module Kernel
  def as(ancestor, &blk)
    @__as ||= {}
    unless r = @__as[ancestor]
      r = (@__as[ancestor] = As.new(self, ancestor))
    end
    r.instance_eval(&blk) if block_given?
    r
  end
end

class As #:nodoc:
  private *instance_methods.select { |m| m !~ /(^__|^\W|^binding$)/ }

  def initialize(subject, ancestor)
    @subject = subject
    @ancestor = ancestor
  end

  def method_missing(sym, *args, &blk)
    @ancestor.instance_method(sym).bind(@subject).call(*args,&blk)
  end
end

module M
  def hello
    puts "hello from module"
  end
end

class C
  include M
  alias_method :module_hello,:hello
  def hello
    puts "hey there from class"
  end
end

obj = C.new
obj.hello
obj.as(M).hello