This serves as a useful base case, similar to a base Visitor class in the classic Visitor pattern.

这将作为一种有用的基本用例，类似于经典访问者模式中的基本Visitor类。

youdao

This serves as a useful base case, similar to a base Visitor class in the classic Visitor pattern.

这将作为一种有用的基本用例，类似于经典访问者模式中的基本Visitor类。

youdao