设计模式之责任链模式

目标：使多个对象都有机会处理请求,从而避免请求的发送者和接收者之间的耦合关系。将这个对象连成一条链,并沿着这条链传递该请求,直到有一个对象处理为止。

示例代码：
#include
#include
#include

using namespace std;

//请求
class Request
{
public:
    string m_strContent;
    int m_nNumber;
};

//管理者
class Manager
{
protected:
    Manager* manager;
    string name;
public:
    Manager(string temp)
    {
        name = temp;
    }
   
    void SetSuccessor(Manager* temp)
    {
        manager = temp;
    }
    virtual void GetRequest(Request* request)=0;
};

//经理
class CommonManager : public Manager
{
public:
    CommonManager(string strTemp) : Manager(strTemp){}
    virtual void GetRequest(Request* request)
    {
        if(request->m_nNumber >= 0 && request->m_nNumber < 10)
        {
            cout << name << "处理了" << request->m_nNumber << "个请求" << endl;
        }
        else
        {
            manager->GetRequest(request);
        }
    }
};

//总监
class MajorDomo : public Manager
{
public:
    MajorDomo(string name) : Manager(name){}
    virtual void GetRequest(Request* request)
    {
        if(request->m_nNumber >= 10)
        {
            cout << name << "处理了" << request->m_nNumber << "个请求" << endl;
        }
    }
};

//客户端
int main()
{
    Manager* common = new CommonManager("张经理");
    Manager* major = new MajorDomo("任总监");
   
    common->SetSuccessor(major);
   
    Request* req = new Request();
    req->m_nNumber = 33;
    common->GetRequest(req);
   
    req->m_nNumber = 5;
    common->GetRequest(req);
   
    return 0;
}