Visitor mode: Pay attention to the change of encapsulation object operation, support adding new operations to the class structure at runtime, and define new operations on these class instances without changing various types in the class hierarchy.
他知道你的身份吗?共敖不由的捏了一把汗,儿子以临江国太子的身份和蛮人来往,着实有些危险。
田遥脸上忽然现出古怪笑容。
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