sum of class是什么意思 sum of class怎么读
sum of class的用法和样例
- Similarly, if a base and its derived types all need access to another class, that class must specifically grant access to the base and each derived class.
同样，如果基类和派生类都需要访问另一个类，那个类必须特地将访问权限授予基类的和每一个派生类。
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