C++通过模板实现多态

#include <iostream>
using namespace std;
 
template<typename T>
class Phone
{
public:
    void show()
    {
        T* pThis = static_cast<T*>(this);
        pThis->printName();
    }
public:
    void printName(){    cout<<"Phone ... "<<endl;  }
};
 
class Nokia : public Phone<Nokia>
{
public:
    void printName(){  cout<<"Nokia Phone ... "<<endl;   }
};
class Samang:public Phone<Samang>
{
public:
    void printName(){   cout<<"Samang Phone ... "<<endl;   }
};
class UnknowPhone:public Phone<UnknowPhone>
{
};
 
int main()
{
    Nokia nokia;
    Samang samang;
    UnknowPhone unPhone;
 
    nokia.show();
    samang.show();
    unPhone.show();
}

输出结果如下：

Nokia Phone ...
Samang Phone ...
Phone ...
请按任意键继续. . .