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/shimmy (swing)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 EncyclopediaDouble panel玉帝、紫薇大帝、勾陈大帝、真武大帝、长生大帝、王母、太白金星等天庭仙神。113. X.X.8杜雪颜是一名年轻而坚定的抗联战士。她丈夫曹子轩是她大学同学，北伐时期曹也是热血青年，后精神颓该剧根据Mick Herron的同名系列小说改编，故事围绕着军情五处内一个不正常的特务组，以及他们讨人厌的老板：臭名满天下的杰克逊·兰姆。他们在真假难辨的间谍世界中努力着，以保卫英国免受邪恶势力的侵害。