如果我分配一个类的对象Derived（基类为Base），并将指向该对象的指针存储在指向基类的变量中，我如何访问该对象的成员Derived class?
这是一个例子：
class Base
{
public:
int base_int;
};
class Derived : public Base
{
public:
int derived_int;
};
Base* basepointer = new Derived();
basepointer-> //Access derived_int here, is it possible? If so, then how?
不，您无法访问derived_int因为derived_int是其一部分Derived, while basepointer是一个指向Base.
不过你也可以反过来做：
Derived* derivedpointer = new Derived;
derivedpointer->base_int; // You can access this just fine
派生类继承基类的成员，而不是相反。
但是，如果您的basepointer指向一个实例Derived然后你可以通过强制转换来访问它：
Base* basepointer = new Derived;
static_cast<Derived*>(basepointer)->derived_int; // Can now access, because we have a derived pointer
请注意，您需要将继承更改为public first:
class Derived : public Base
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