请考虑访问者模式，其中用for方法为复合层次结构中的每个类都定义了访问者类。
Consider the visitor pattern in which a visitor class is defined with a for method for each class in a composite hierarchy.
请考虑访问者模式，其中用for方法为复合层次结构中的每个类都定义了访问者类。
Consider the visitor pattern in which a visitor class is defined with a for method for each class in a composite hierarchy.
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