c++ - Boost 状态机延迟事件

Question

struct transition_table : mpl::vector<
  Row < waiting, update, pending, send_replace, none>,
  Row < pending, update, none, Defer, none>,
  Row < pending, replaced, waiting, ack_replace, none>
  > { }; 

如果第二个转换连续两次延迟，是否可以丢弃第一个？