C++ 多态案例（三）- 电脑组装

#include<iostream>using namespace std;
//抽象CPU类class CPU{public:  //抽象的计算函数  virtual void calculate() = 0;};
//抽象显卡类class VideoCard{public:  //抽象的显示函数  virtual void display() = 0;};
//抽象内存条类class Memory{public:  //抽象的存储函数  virtual void storage() = 0;};
//电脑类class Computer{public:  Computer(CPU * cpu, VideoCard * vc, Memory * mem)  {    m_cpu = cpu;    m_vc = vc;    m_mem = mem;  }
  //提供工作的函数  void work()  {    //让零件工作起来，调用接口    m_cpu->calculate();
    m_vc->display();
    m_mem->storage();  }
  //提供析构函数 释放3个电脑零件  ~Computer()  {
    //释放CPU零件    if (m_cpu != NULL)    {      delete m_cpu;      m_cpu = NULL;    }
    //释放显卡零件    if (m_vc != NULL)    {      delete m_vc;      m_vc = NULL;    }
    //释放内存条零件    if (m_mem != NULL)    {      delete m_mem;      m_mem = NULL;    }  }
private:
  CPU * m_cpu; //CPU的零件指针  VideoCard * m_vc; //显卡零件指针  Memory * m_mem; //内存条零件指针};
//具体厂商//Intel厂商class IntelCPU :public CPU{public:  virtual void calculate()  {    cout << "Intel的CPU开始计算了！" << endl;  }};
class IntelVideoCard :public VideoCard{public:  virtual void display()  {    cout << "Intel的显卡开始显示了！" << endl;  }};
class IntelMemory :public Memory{public:  virtual void storage()  {    cout << "Intel的内存条开始存储了！" << endl;  }};
//Lenovo厂商class LenovoCPU :public CPU{public:  virtual void calculate()  {    cout << "Lenovo的CPU开始计算了！" << endl;  }};
class LenovoVideoCard :public VideoCard{public:  virtual void display()  {    cout << "Lenovo的显卡开始显示了！" << endl;  }};
class LenovoMemory :public Memory{public:  virtual void storage()  {    cout << "Lenovo的内存条开始存储了！" << endl;  }};

void test01(){  //第一台电脑零件  CPU * intelCpu = new IntelCPU;  VideoCard * intelCard = new IntelVideoCard;  Memory * intelMem = new IntelMemory;
  cout << "第一台电脑开始工作：" << endl;  //创建第一台电脑  Computer * computer1 = new Computer(intelCpu, intelCard, intelMem);  computer1->work();  delete computer1;
  cout << "-----------------------" << endl;      cout << "第二台电脑开始工作：" << endl;  //第二台电脑组装  Computer * computer2 = new Computer(new LenovoCPU, new LenovoVideoCard, new LenovoMemory);;//new出来的指针直接传到参数里。  computer2->work();  delete computer2;
  cout << "-----------------------" << endl;  cout << "第三台电脑开始工作：" << endl;  //第三台电脑组装  Computer * computer3 = new Computer(new LenovoCPU, new IntelVideoCard, new LenovoMemory);;  computer3->work();  delete computer3;
}