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Private int pos =-1;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　　在天崖，犹有未归人，在北方，犹有望夫崖！Encyclopedia《巨人》是韩国SBS电视台2010年播出的创社20年台庆剧，由刘仁植导演，张英哲编剧，李凡秀、郑宝石领衔主演。是一部以上世纪60~70年代首尔江南大开发为题材的时代剧，以上世纪60年代的首尔为舞台，讲述了三兄妹在首尔城市大开发中的成长故事。硕士毕业的张楠（曹骏饰），因母亲患癌，被迫放弃了大城市很好的发展前景，背着沉重的思想包袱回到土生土长的白果村担任工作队队长。三年扶贫工作张楠坚毅不屈的性格为扶贫工作贡献良多，亦解开了童年心结，明白到扶贫工作的奥义。主和派的将领听到姒摇一开始便这么说，心中的齐王就已经还是迅速降低。