# attr_accessor for class variable.
# usage:
#
#   ```
#   class Pod
#       class_attr_accessor :is_prebuild_stage
#   end
#   ```
#
def class_attr_accessor(symbol)
    self.class.send(:attr_accessor, symbol)
end



class Object
    def deep_clone
      return @deep_cloning_obj if @deep_cloning
      @deep_cloning_obj = clone
      @deep_cloning_obj.instance_variables.each do |var|
        val = @deep_cloning_obj.instance_variable_get(var)
        begin
          @deep_cloning = true
          val = val.deep_clone
        rescue TypeError
          next
        ensure
          @deep_cloning = false
        end
        @deep_cloning_obj.instance_variable_set(var, val)
      end
      deep_cloning_obj = @deep_cloning_obj
      @deep_cloning_obj = nil
      deep_cloning_obj
    end
end