设计模式3、工厂方法模式 Factory Method

product.h
#pragma once
#include 
using namespace std;
// 汽车接口
class ICar
{
public:
   virtual string Name() = 0;  // 汽车名称
};
concreteProduct.h
#pragma once
#include "product.h"
// 奔驰汽车
class BenzCar : public ICar
{
public:
   string Name()
   {
       return "Benz Car";
   }
};
// 宝马汽车
class BmwCar : public ICar
{
public:
   string Name()
   {
       return "Bmw Car";
   }
};
// 奥迪汽车
class AudiCar : public ICar
{
public:
   string Name()
   {
       return "Audi Car";
   }
};
factory.h
#pragma once
#include "product.h"
// 工厂接口
class AFactory
{
public:
   virtual ICar* CreateCar() = 0;  // 生产汽车
};
concreteProduct.h
#pragma once
#include "factory.h"
#include "concreteProduct.h"
// 奔驰工厂
class BenzFactory : public AFactory
{
public:
   ICar* CreateCar()
   {
       return new BenzCar();
   }
};
// 宝马工厂
class BmwFactory : public AFactory
{
public:
   ICar* CreateCar()
   {
       return new BmwCar();
   }
};
// 奥迪工厂
class AudiFactory : public AFactory
{
public:
   ICar* CreateCar()
   {
       return new AudiCar();
   }
};
main.cpp
#include "concreteFactory.h"
#include "product.h"
#include 
#ifndef SAFE_DELETE
#define SAFE_DELETE(p) { if(p){delete(p); (p)=NULL;} }
#endif
int main()
{
   // 奔驰
   AFactory *pFactory = new BenzFactory();
   ICar *pCar = pFactory->CreateCar();
   cout << "Benz factory: " << pCar->Name() << endl;
   SAFE_DELETE(pCar);
   SAFE_DELETE(pFactory);
   // 宝马
   pFactory = new BmwFactory();
   pCar = pFactory->CreateCar();
   cout << "Bmw factory: " << pCar->Name() << endl;
   SAFE_DELETE(pCar);
   SAFE_DELETE(pFactory);
   // 奥迪
   pFactory = new AudiFactory();
   pCar = pFactory->CreateCar();
   cout << "Audi factory: " << pCar->Name() << endl;
   SAFE_DELETE(pCar);
   SAFE_DELETE(pFactory);
   system("pause");
   return 0;
}