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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 Encyclopedia此战骑兵的强大战斗力的和作战效果显露无疑，尹旭终于看到了这一支强大王牌骑兵终于打造成功了，其效果将会惊天冬天，震撼天下。笨蛋爱上天才，会有结果吗？平凡女孩原湘琴（林允饰）喜欢上了天才少年江直树（王大陆饰），在她表白失败准备放弃之际，爸爸居然带着自己搬进了直树家里？！一个猛追，一个猛逃，热闹欢腾的纯真高中生活就此上演。朝夕相处中，直树渐渐被湘琴乐观的无畏精神吸引，他开始怀疑：湘琴究竟是人生偏差、还是自己的命中注定?言下之意，若依他们的意思，跟秦溪耗在这，那就是愚蠢了。看着睢水为之不流，尽数染红的时候或许又是另一番感受。拥有“铜豌豆”性格的夏蕊宁进入西陵大学文博学院，与拥有丰富家传古籍古画藏书的西陵夜家兄弟夜凛和夜渺，以及自家保姆的女儿“灰姑娘”沈真相遇，四人之间剪不断理还乱的纠葛人生，最终因“古画修复”而得以圆满的故事。王将 丹波哲郎 後藤えり子