# File lib/facets/more/rwdelegator.rb, line 9
  def initialize( write, &read )
    @read = read
    @write = write

    # ensure other classes can deduce equality.
    read_class = @read.call.object_class
    unless read_class.method_defined?(:eq_with_rwdelegator?)
      read_class.class_eval %{
        def eq_with_rwdelegator?( other )
          if RWDelegator === other
            other == self
          else
            eq_without_rwdelegator?(other)
          end
        end
        alias_method :eq_without_rwdelegator?, :==
        alias_method :==, :eq_with_rwdelegator?
      }
    end
  end