派生类的指针可以类型转换为其基类的指针吗？ [英] Can a pointer of a derived class be type cast to the pointer of its base class?

问题描述

new返回的派生类的指针可以类型转换为其基类的指针。

The pointer of derived class returned by new can be type cast to the pointer of its base class.

这是真还是假？

我知道dynamic_cast可以用来投下。一般来说，如何将派生类的指针转换为其基类的指针？

I know dynamic_cast can be used to cast downside. Generally, how to cast a pointer of derived class to a pointer of its base class?

推荐答案

是的。从指针到派生类到指向基类的指针的转换是隐式的。因此，以下是完全正确的：

Yes. Conversion from a pointer to a derived class to a pointer to a base class is implicit. Thus, the following is perfectly fine:

struct B { };
struct D : B { };

D* my_d_ptr = new D;
B* my_d_ptr_as_a_b_ptr = my_d_ptr;

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