我对将指向基类对象的指针转换为派生类的指针感到困惑。请检查以下代码:
derivate_class *d1 = (derivate_class*)cb;
d1->print();
d1->print1();
结果是:
谁能帮我解释为什么要d1->print()
打印“我是基地的虚拟功能。”?
#include <iostream>
using namespace std;
class base
{
public:
virtual void print()
{
cout << "I'm a virtual function in base." << endl;
}
};
class derivate_class : public base
{
public:
void print()
{
cout << "I rewrite the virtual function in base." << endl;
}
void print1()
{
cout << "I'm a function in derivate class." << endl;
}
};
int main()
{
base* b = new base();
derivate_class *d = new derivate_class();
b->print();
d->print1();
base* cb = b;
b = d;
b->print();
cout << "*********************" << endl;
derivate_class *d1 = (derivate_class*)cb;
d1->print();
d1->print1();
system("pause");
return 0;
}