设计模式 之 工厂模式

#include

using namespace std;

/*
 * 产品类
*/
class CBaseProduct
{
public:
 virtual void Print() = 0;
};

class CDeriveProductOne:public CBaseProduct
{
public:
 virtual void Print()
 {
  cout << "hello one" << endl;
 }
};

class CDeriveProductTwo:public CBaseProduct
{
public:
 virtual void Print()
 {
  cout << "hello Two" << endl;
 }
};

/*
 * 工厂类
*/

class CBaseFactory
{
public:
 virtual CBaseProduct * MakeProduct(int) = 0;
};

class CDeriveFactory:public CBaseFactory
{
public:
 virtual CBaseProduct *  MakeProduct(int iFlag);
};

/*
* 生产产品子类的实例函数
*/
CBaseProduct *
CDeriveFactory::MakeProduct(int iFlag)
{
 CBaseProduct *pProduct = NULL;

 try
 {
  switch(iFlag)
  {
  case 1:
   pProduct = new CDeriveProductOne();
   break;
  case 2:
   pProduct = new CDeriveProductTwo();
   break;
  default:
   throw(0);
  }
  
 }
 catch(...)
 {
  cout << "new obj failed" << endl;
 }

 return pProduct;
}

int main()
{
 CBaseProduct *p = NULL;
 CBaseFactory *f = new CDeriveFactory();

 p =  f->MakeProduct(2);
 
 p->Print();

 return 0;
}