http://code.google.com/p/ruby-protobuf/issues/detail?id=46

gistfile1.rb

require 'delegate'

class EnumValue < SimpleDelegator
  def initialize(name, value)
    @name = name
    @value = value
    super(@value)
  end

  def to_s
    @name.to_s
  end

  def inspect
    "\#<#{self.class} #{@name}=#{@value}>"
  end
end


if __FILE__ == $0
  require 'test/unit'

  class EnumValueTest < Test::Unit::TestCase
    def test_enum_value
      enum_value = EnumValue.new(:name, 10)

      assert_equal('name', enum_value.to_s)
      assert(enum_value == 10)
      assert(10 == enum_value)

      assert(11, enum_value + 1)
      assert(11, 1 + enum_value)
    end
  end
end