# File lib/log4r/NDC.rb, line 39
    def self.inherit( a_stack )
      if ( a_stack.class == Array ) then
        if ( Thread.current[NDCNAME] != nil ) then
          Thread.current[NDCNAME].clear
          Thread.current[NDCNAME] = nil
        end
        Thread.current[NDCNAME] = a_stack
      else
        raise "Expecting Array in NDC.inherit"
      end
    end