# File vendor/flag_set_maker.rb, line 19
    def to_s(v)
      names= []
      @flag_names.each_with_index(){ |name, i| names.push(name) if v[i]==1 }
      if names.empty?()
        return (@zero_name.to_s() || "0")
      elsif names.size==1
        return names[0].to_s()
      else
        return "("+names.join("|")+")"
      end
    end