template实现多态

最新推荐文章于 2024-12-05 00:00:00 发布

转载最新推荐文章于 2024-12-05 00:00:00 发布 · 617 阅读

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前几天重温了下C++：

#pragma once

#include <iostream>
template<class T>
class CBase
{
public:
    void Display()
    {
        T* pT = static_cast<T*>(this);
        pT->Print();
    }
protected:
    void Print()
    {
        printf("This is CBase class/n");
    }
};

class CBaseClass:public CBase<CBaseClass>
{
    friend class CBase<CBaseClass>;
};

class CDerivedClass:public CBase<CDerivedClass>
{
    friend class CBase<CDerivedClass>;
protected:
    void Print()
    {
        printf("This is CDerived class/n");
    }
};

class CTestATL
{
public:
static void Test()
{
  CBaseClass * base = new CBaseClass();
  CDerivedClass * derived = new CDerivedClass();
  base->Display();
  derived->Display();
}
};