问题描述
如果我分配一个 Derived
类的对象(具有 Base
的基类),并将指向该对象的指针存储在指向基类的变量中类,如何访问 Derived
类的成员?
If I allocate an object of a class Derived
(with a base class of Base
), and store a pointer to that object in a variable that points to the base class, how can I access the members of the Derived
class?
这是一个例子:
推荐答案
不,您不能访问 derived_int
因为 derived_int
是 Derived
的一部分,而 basepointer
是指向 Base
的指针.
No, you cannot access derived_int
because derived_int
is part of Derived
, while basepointer
is a pointer to Base
.
你可以反过来做:
派生类继承基类的成员,而不是相反.
Derived classes inherit the members of the base class, not the other way around.
但是,如果您的 basepointer
指向 Derived
的实例,那么您可以通过强制转换访问它:
However, if your basepointer
was pointing to an instance of Derived
then you could access it through a cast:
请注意,您需要先将继承更改为 public
:
Note that you'll need to change your inheritance to public
first:
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