c++ - 在 C++ 中向上转型和向下转型跳过层次结构？

Question

我已经搜索过这个特定的问题，但找不到它，所以就在这里。跳过中间的类来向上或向下转换好吗？

示例代码-

class Base { }
class Derived : public Base { }
class DerivedOfDerived : public Derived { }
class DerivedOfDOD : public DerivedOfDerived { }

int main()
{
    DerivedOfDOD *dodod = new DerivedOfDOD();
    Base *b = static_cast<Base *>(dodod);
    Derived *d = static_cast<Derived *>(b);
    back_to_b = static_cast<Base *>(d);
    DerivedOfDerived *dod = static_cast<DerivedOfDerived *>(back_to_b);
    delete dodod;
}

这是有效的代码吗？以及对编译器如何管理地址和这种转换的解释将不胜感激。

Answer 1

Is it fine to upcast or downcast by skipping the classes in the middle?

是的。

Is this valid code?

是的。 (如果我们忽略内存泄漏的话)

附言向上转换是隐式的，因此 Base *b = dodod; 就足够了。