原型模式（prototype）

  1 #include <iostream>
  2 #include <string>
  3 #include <sstream>
  4 #include <typeinfo>
  5 using namespace std;
  6 template <class T>
  7 string iToStr(T value) {
  8     stringstream ss;
  9     ss << value;
 10     return ss.str();
 11 }
 12 class OrderApi {
 13 public:
 14     virtual int getOrderProductNum() = 0;
 15     virtual void setOrderProductNum(int num) = 0;
 16     virtual string getOrderContent() = 0;
 17     virtual OrderApi* cloneOrder() = 0;
 18 protected:
 19     OrderApi() {}
 20 };
 21 
 22 class HomeOrder : public OrderApi {
 23 public:
 24     int getOrderProductNum() {
 25         return m_orderProductNum;
 26     }
 27     void setOrderProductNum(int num) {
 28         m_orderProductNum = num;
 29     }
 30     string getOrderContent() {
 31         return "本次订单的客户是" + m_strCustomerName + "订单的id" + m_strProductId + "订单的数量是" + iToStr(m_orderProductNum);
 32     }
 33 
 34     void setCustomerName(string strCustomerName) {
 35         m_strCustomerName = strCustomerName;
 36     }
 37 
 38     string getCustomerName() {
 39         return m_strCustomerName;
 40     }
 41 
 42     void setProductId(string strProductId) {
 43         m_strProductId = strProductId;
 44     }
 45     string getProductId() {
 46         return m_strProductId;
 47     }
 48 
 49     //重构
 50     OrderApi* cloneOrder();
 51 private:
 52     string m_strCustomerName;
 53     string m_strProductId;
 54     int m_orderProductNum;
 55 };
 56 
 57 OrderApi* HomeOrder::cloneOrder() {
 58     
 59     HomeOrder *pHomeOrder = new HomeOrder;
 60     pHomeOrder->setCustomerName(m_strCustomerName);
 61     pHomeOrder->setProductId(m_strProductId);
 62     pHomeOrder->setOrderProductNum(m_orderProductNum);
 63     return pHomeOrder;
 64 }
 65 
 66 
 67 class AboardOrder : public OrderApi {
 68 public:
 69     int getOrderProductNum() {
 70         return m_orderProductNum;
 71     }
 72     void setOrderProductNum(int num) {
 73         m_orderProductNum = num;
 74     }
 75     string getOrderContent() {
 76         return "本次订单的客户是" + m_strCustomerName + "订单的id" + m_strProductId + "订单的数量是" + iToStr(m_orderProductNum);
 77     }
 78 
 79     void setCustomerName(string strCustomerName) {
 80         m_strCustomerName = strCustomerName;
 81     }
 82 
 83     string getCustomerName() {
 84         return m_strCustomerName;
 85     }
 86 
 87     void setProductId(string strProductId) {
 88         m_strProductId = strProductId;
 89     }
 90     string getProductId() {
 91         return m_strProductId;
 92     }
 93     //重构
 94     OrderApi* cloneOrder();
 95 private:
 96     string m_strCustomerName;
 97     string m_strProductId;
 98     int m_orderProductNum;
 99 };
100 
101 OrderApi* AboardOrder::cloneOrder() {
102 
103     AboardOrder *pHomeOrder = new AboardOrder;
104     pHomeOrder->setCustomerName(m_strCustomerName);
105     pHomeOrder->setProductId(m_strProductId);
106     pHomeOrder->setOrderProductNum(m_orderProductNum);
107     return pHomeOrder;
108 }
109 
110 class OrderBusiness {
111 public:
112     void saveOrder(OrderApi* pOrder);
113 };
114 
115 void OrderBusiness::saveOrder(OrderApi* pOrder) {
116     //判读一下，工件的数量有无超过200
117     while (pOrder->getOrderProductNum() > 200) {
118         //新建一个订单
119         OrderApi* pNewOrder = pOrder->cloneOrder();
120         pNewOrder->setOrderProductNum(200);
121         
122         pOrder->setOrderProductNum(pOrder->getOrderProductNum() - 200);
123         cout << "新订单是" << pNewOrder->getOrderContent() << endl;
124     }
125     //不超过200个
126     cout << "最终的订单是" << pOrder->getOrderContent() << endl;
127 }
128 
129 int main(void) {
130     HomeOrder* pHome = new HomeOrder;
131     pHome->setOrderProductNum(512);
132     pHome->setCustomerName("xcj&dst");
133     pHome->setProductId("C++设计模式精讲");
134     OrderBusiness* pOb = new OrderBusiness();
135     pOb->saveOrder(pHome);
136     system("pause");
137     return 0;
138 }