还有另一种方法可以从基指针对象调用派生类方法，而无需强制转换？
class Base
{
};
class Derived : public Base
{
public:
void set() {printf("bbbbbbbbbbbb"); }
};
int main()
{
Base* pbBase;
pbBase = new Derived();
//pbBase->set(); // Compilation error.
(Derived*)pbBase->set(); // Working.
}
可以在基本中添加虚拟方法，在派生中重写这些方法。
请注意，您也应该使析构函数虚拟，否则当您通过基类指针删除对象时，派生类的析构函数将不会被调用。
#include <iostream>
class Base
{
public:
virtual ~Base() = default;
virtual void set() = 0; // = 0 makes it pure virtual
};
class Derived : public Base
{
public:
void set() override { std::cout << "bbbbbbbbbbbb\n"; }
};
int main()
{
Base* pbBase;
pbBase = new Derived();
pbBase->set();
delete pbBase;
}
