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顾菲是某酒店的一位领班，身上有着中国女人特有的善良与坚韧。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From EncyclopediaArticle 9 Narrow waterways只见刘蝉儿对他伸手娇唤：葫芦表哥，拽我一把。Maybe I am a. Forget it, I wish everyone an early brush to the night talk egret ~