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Visitor(Chapter 15 of Pro Objective-C Design Patterns for iOS)

摘要: The Visitor pattern represents an operation to be performed on the elements of an objectstructure. Visitor lets you define a new operation without changing the classes of the elements onwhich it operates. 阅读全文

posted @ 2012-05-03 13:48 Ray Z 阅读(270) 评论(0) 推荐(0) 编辑