C ++多态性：如何测试一个类是否衍生自另一个基类？

对不起，标题的措辞；我不知道如何做得更好。但是我的问题的要点是：

#include <iostream>
using namespace std;

class Base {};
class Base2 {};
class C : public Base, public Base2 {};
class D : public Base {};

void isDerivedFromBase2(Base *p) {
    if (...) { /* test whether the "real object" pointed by p is derived from Base2? */
        cout << "true" << endl;
    }
    cout << "false" << endl;
}
int main() {
    Base *pc = new C;
    Base *pd = new D; 
    isDerivedFromBase2(pc); // prints "true"
    isDerivedFromBase2(pd); // prints "false"

    // ... other stuff
}

如何测试由其基类指针表示的对象Base *是否从另一个基类派生Base2？