The WSXL base interfaces include the four categories shown in Table 1.

WSXL 基本接口有四类，如 表 1 中所示。

youdao

So a class or struct is required to implement all the methods of all the interfaces in the transitive closure of its base interfaces?

那么就是说一个class或者一个struct必须要实现其传递闭包上所有接口定义的所有方法吗？

youdao

When a class implements an interface that has multiple base interfaces, objects created from that class can be upcast to any of the base interface types.

当一个类实现有多个基接口的接口时，从这个类生成的对象可以上溯到任何一个基接口。

youdao