I'm learning how to use class_eval in modules (I'm somewhat familiar with class_eval) and came across this helpful class in resource_controller. In there they have things like this:

class_eval <<-"end_eval", __FILE__, __LINE__

  def #{block_accessor}(*args, &block)
    unless args.empty? && block.nil?
      args.push block if block_given?
      @#{block_accessor} = [args].flatten
    end

    @#{block_accessor}
  end

end_eval

What does __FILE__ and __LINE__ do in that context? I know __FILE__ references the current file, but what does that whole thing do exactly? Don't really know how to search for that :).