Base class sub-objects may have zero size.

基类子对象可以具有零大小。

youdao

Though you call it with sub class object, it will run only base class implementation.

虽然你叫它的子类对象，它将只运行基类的实现。

youdao

Though you call it with sub class object, it will run only base class implementation.

虽然你叫它的子类对象，它将只运行基类的实现。

youdao