中介者模式中，个体与个体之间不需要发生直接关联，而是只需要与中介者进行交互，并由中介完成一系列任务。

 

Mediator.h内容

1 #ifndef Mediator_H_H 2 #define Mediator_H_H 3  4 #include 
     
       5 using namespace std; 6  7 class Student; 8  9 class Mediator10 {11 public:12     Mediator() : src(NULL), target(NULL) {}13     void send(string strMessage);14     void setTarget(Student *target0) { target = target0; }15 16 private:17     Student *src, *target;18 };19 20 class Student21 {22 public:23     Student() : mediator(NULL) {}24     virtual void recvMessage(string strMessage) = 0;25     virtual ~Student() {}26     void sendMessage(Student *student, string strMessage){27         mediator->setTarget(student);28         mediator->send(strMessage);29     }30     void setMediator(Mediator *mediator0) { mediator = mediator0; }31 32 protected:33     Mediator *mediator;34 35 };36 37 class Student1 : public Student38 {39 public:40     virtual void recvMessage(string strMessage){41         cout << "Student1 recv: " << strMessage << endl;42     }43 };44 45 class Student2 : public Student46 {47 public:48     virtual void recvMessage(string strMessage){49         cout << "Student2 recv: " << strMessage << endl;50     }51 52 };53 54 55 void Mediator::send(string strMessage)56 {57     target->recvMessage(strMessage);58 }59 60 61 void MediatorTest()62 {63     Student *student1 = new Student1();64     Student *student2 = new Student2();65     Mediator *mediator = new Mediator();66     student1->setMediator(mediator);67     student2->setMediator(mediator);68 69     student1->sendMessage(student2, "How are you?");70     student2->sendMessage(student1, "Very well, Thank you!");71 72     delete mediator;73 74     delete student1;75     delete student2;76 77 }78 79 80 #endif
     

 

运行结果：

创建两个student，他们通过中介者实现了交互过程。