理学 设计模式 释 visitor pattern 访问者模式 描述在一个对象结构中对某个对象元素需要执行的操作一种设计模式，使用该模式可以在不改变被操作元素的类的前提下定义作用于这些元素的新操作。
软件工程 释文 visitor pattern 访问者模式
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- indication of declaration of intention
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- indications of the five pathological colors
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- indicative abstracts
- indicative conditional
- indicative plant
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