想请教一下，TType接口中的Apply方法，其作用是什么呢？ #112
DustinMaple
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TType中一共6个Apply方法，我看了他所有的实现，都是visitor.Accept。那为什么没有直接在调用Apply的地方，写成visitor.Accept呢？是为了预留什么扩展吗？或者是其他什么考虑呢？
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