设计模式 C++实现职责链模式 （顺便复习C++）

#include 
#include 
#include
#include
using namespace std;
class PurchaseRequest 
{
private:
    string purchaseName;
    int purchaseNum;
public:
    PurchaseRequest(string purchaseName, int purchaseNum) 
    {
        this->purchaseName = purchaseName;
        this->purchaseNum = purchaseNum;
    }
    int getPurchaseNum() 
    {
        return purchaseNum;
    }
    void setPurchaseName(string purchaseName)
    {
        this->purchaseName = purchaseName;
    }
    string getPurchaseName() {
        return purchaseName;
    }
    void setPurchaseNum(int purchaseNum) {
        this->purchaseNum = purchaseNum;
    }
};
class Leader 
{
//C++中类中自身类的对象不能做自己的数据成员,但是做静态数据成员、引用类数据成员等可以
//不能使用抽象数据成员
protected:
    string name;
    Leader *successor;//使用指针,类的定义要知道类的空间分配大小
public:
    Leader(string name)
    {
        this->name = name;
    }
    Leader(Leader* leader, string name) :successor(leader), name(name) {}//:冒号，参数初始化
    virtual void handleRequest(PurchaseRequest request) = 0;
};
class Director: public Leader
{
public:
    Director(Leader* leader, string name): Leader(leader,name){}//子类调用父类的构造函数
    void handleRequest(PurchaseRequest requset) 
    {
        int num = requset.getPurchaseNum();
        string num_str;
        stringstream sStream;
        sStream << num;
        sStream >> num_str;
        if (requset.getPurchaseNum() <= 10000) {
            cout << "主任" + name + "审批" + requset.getPurchaseName() + "，" + num_str+ "元采购单" << endl;
        }
        else {
            successor->handleRequest(requset);//交由上级处理
        }
    }
};
class Manager :public Leader
{
public:
    Manager(Leader* leader, string name) : Leader(leader, name) {}//子类调用父类的构造函数
    void handleRequest(PurchaseRequest requset)
    {
        int num = requset.getPurchaseNum();
        //int类型转为string类型
        string num_str;
        stringstream sStream;
        sStream << num;
        sStream >> num_str;
        if (requset.getPurchaseNum() <= 50000) {
            cout << "部门经理" + name + "审批" + requset.getPurchaseName() + "，" + num_str + "元采购单" << endl;
        }
        else {
            successor->handleRequest(requset);//交由上级处理
        }
    }
};
class smallGeneralManager :public Leader
{
public:
    smallGeneralManager(Leader* leader, string name) : Leader(leader, name) {}//子类调用父类的构造函数
    void handleRequest(PurchaseRequest requset)
    {
        int num = requset.getPurchaseNum();
        string num_str;
        stringstream sStream;
        sStream << num;
        sStream >> num_str;
        if (requset.getPurchaseNum() <= 100000) {
            cout << "副总经理" + name + "审批" + requset.getPurchaseName() + "，" + num_str + "元采购单" << endl;
        }
        else {
            successor->handleRequest(requset);//交由上级处理
        }
    }
};
class GeneralManager :public Leader
{
public:
    GeneralManager(Leader* leader, string name) : Leader(leader, name) {}//子类调用父类的构造函数
    void handleRequest(PurchaseRequest requset)
    {
        int num = requset.getPurchaseNum();
        string num_str;
        stringstream sStream;
        sStream << num;
        sStream >> num_str;
        if (requset.getPurchaseNum() <= 200000) {
            cout << "总经理" + name + "审批" + requset.getPurchaseName() + "，" + num_str + "元采购单" << endl;
        }
        else {
            successor->handleRequest(requset);//交由上级处理
        }
    }
};
class Workers :public Leader
{
public:
    Workers(Leader* leader, string name) : Leader(leader, name) {}//子类调用父类的构造函数
    void handleRequest(PurchaseRequest requset)
    {
        int num = requset.getPurchaseNum();
        string num_str;
        stringstream sStream;
        sStream << num;
        sStream >> num_str;
        if (requset.getPurchaseNum() > 200000) {
            cout << "经职工大会" + name + "审批" + requset.getPurchaseName() + "，" + num_str + "元采购单" << endl;
        }
        else {
            successor->handleRequest(requset);//交由上级处理
        }
    }
};
int main()
{
    Leader* workers = new Workers(NULL, "第一次会议");
    Leader* generalManger = new GeneralManager(workers, "张三");
    Leader* objectsmallGeneralManager = new smallGeneralManager(generalManger, "李波");
    Leader* objectManager = new  Manager(objectsmallGeneralManager, "赵强");
    Leader* objectDirector = new Director(objectManager, "王明");
    PurchaseRequest purchaseRequest1("小红", 5000);
    PurchaseRequest purchaseRequest2("小绿", 40000);
    PurchaseRequest purchaseRequest3("小黄", 80000);
    PurchaseRequest purchaseRequest4("小蓝", 150000);
    PurchaseRequest purchaseRequest5("小紫", 250000);
    objectDirector->handleRequest(purchaseRequest1);
    objectDirector->handleRequest(purchaseRequest2);
    objectDirector->handleRequest(purchaseRequest3);
    objectDirector->handleRequest(purchaseRequest4);
    objectDirector->handleRequest(purchaseRequest5);
}