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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:韩信轻轻摇摇头，匆匆忙忙往书房赶去。二十六具尸体被悬挂当街，宋慈与女助手雨墨深入调查。这是起随机杀人案，与十年前的波旬教案有关，宋慈向恩师耿知年请教，谁知当天二十六具尸自燃，虽灰飞烟灭却有迹可寻，宋慈怀疑这一切正和当年负责波旬教案的耿知年有关。雨墨也已渐渐接近“真相”，耿知年设计蒙晕宋慈，欲将他向魔王波旬献祭，其实耿知年正是波旬教主，仪式开始时雨墨带兵杀到，谁知耿知年竟也在混战中自燃，真凶的背后还有真凶。宋慈引蛇出洞，真凶竟是雨墨，当年耿知年制造了众多冤案，雨墨家满门被杀，而那二十六人正是诬告者。雨墨死在宋慈怀中，宋慈在她身上发现了另一个秘密，雨墨父亲当年侥幸生还，一桩桩杀戮正是他所为，雨墨没有与父亲相认却选择了以死替罪。这场战争，从头到尾，红鸾就没以南雀公主的身份出现在战场上过，如今，却要以亡国公主的身份，被羁绊在大靖京都。李敬文低眉敛目，暗想他有好久没见她了？大概两月了吧。[Report] I suspect this player named Xiao Guo cheated,今夜...轮到谁？友情提示：小盆友请在怪蜀黍陪同下观看！