gistfile1.rb

class ForwardError
  attr_accessor :pointer
  def self.new
    @pointer = Pointer.new_with_type('@')
    self
  end
  def self.to_pointer
    @pointer
  end
  def self.method_missing(method, *args)
    if self.respond_to? method
      args.empty? ? self.send(method) : self.send(method, args)
    else
      args.empty? ? @pointer[0].send(method) : @pointer[0].send(method, args)
    end
  end
end

# error = ForwardError.new
# document = NSXMLDocument.new('<?xml version="1.0" encoding="UTF-8"?>', error.to_pointer) # this will fail to parse as there is no rootElement
# error.localizedDescription