目錄

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基本概念

代碼與實例

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基本概念

中介者模式（Mediator）用一個中介對象來封裝一系列的對象交互。中介者使各對象不需要顯示的相互作用，從而使其耦合松散，而且可以獨立的改變他們之間的關系。

下面是UML圖此圖來源于大話設計模式

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代碼與實例

程序運行截圖如下：

源碼如下：

Head.h

#ifndef HEAD_H #define HEAD_H#include <iostream> #include <string> using namespace std;class Colleague; class ConcreteColleague1; class ConcreteColleague2;//Mediator類 抽象中介者 class Mediator{public:virtual void send(const string &message, Colleague *colleague);virtual ~Mediator();Mediator();Mediator(Mediator &m);Mediator &operator = (Mediator &m); };// Colleague類 抽象同事類 class Colleague{public:Colleague(Mediator *mediator);~Colleague();protected:Mediator *m_mediator; };// ConcreteMediator類 具體中介者類 class ConcreteMediator: public Mediator{public:void setConcreteColleague1(ConcreteColleague1 *colleague);void setConcreteColleague2(ConcreteColleague2 *colleague);void send(const string &message, Colleague *colleague);~ConcreteMediator();private:ConcreteColleague1 *m_colleague1;ConcreteColleague2 *m_colleague2; };//ConcreteColleague1和ConcreteColleague2等各種同事對象 class ConcreteColleague1: public Colleague{public:ConcreteColleague1(Mediator *mediator);~ConcreteColleague1();void send(const string &message);void notify(const string &message);};class ConcreteColleague2: public Colleague{public:ConcreteColleague2(Mediator *mediator);~ConcreteColleague2();void send(const string &message);void notify(const string &message);};#endif

Head.cpp

#include "Head.h" #include <assert.h>void Mediator::send(const string &message, Colleague *colleague) {}Mediator::~Mediator() {cout << "Mediator::~Mediator()" << endl; }Mediator::Mediator() {}Mediator::Mediator(Mediator &m) {}Mediator & Mediator::operator=(Mediator &m) {return Mediator(); }Colleague::Colleague(Mediator *mediator) {m_mediator = mediator; }Colleague::~Colleague() {cout << "Colleague::~Colleague()" << endl; }void ConcreteMediator::setConcreteColleague1(ConcreteColleague1 *colleague) {m_colleague1 = colleague; }void ConcreteMediator::setConcreteColleague2(ConcreteColleague2 *colleague) {m_colleague2 = colleague; }void ConcreteMediator::send(const string &message, Colleague *colleague) {if(colleague == m_colleague1){m_colleague1->notify(message);}else if(colleague == m_colleague2){m_colleague2->notify(message);}else{assert(!"雅喵蝶");} }ConcreteMediator::~ConcreteMediator() {cout << "ConcreteMediator::~ConcreteMediator()" << endl; }ConcreteColleague1::ConcreteColleague1(Mediator *mediator): Colleague(mediator) {}ConcreteColleague1::~ConcreteColleague1() {cout << "ConcreteColleague1::~ConcreteColleague1()" << endl; }void ConcreteColleague1::send(const string &message) {m_mediator->send(message, this); }void ConcreteColleague1::notify(const string &message) {cout << "同事1得到信息: " << message << endl; }ConcreteColleague2::ConcreteColleague2(Mediator *mediator): Colleague(mediator) {}ConcreteColleague2::~ConcreteColleague2() {cout << "ConcreteColleague2::~ConcreteColleague2()" << endl; }void ConcreteColleague2::send(const string &message) {m_mediator->send(message, this); }void ConcreteColleague2::notify(const string &message) {cout << "同事2得到信息: " << message << endl; }

main.cpp

#include "Head.h"int main(int *argc, int *argv[]){ConcreteMediator *m = new ConcreteMediator;ConcreteColleague1 *c1 = new ConcreteColleague1(m);ConcreteColleague2 *c2 = new ConcreteColleague2(m);m->setConcreteColleague1(c1);m->setConcreteColleague2(c2);c1->send("吃飯了嗎？");c2->send("你猜！");cout << endl << endl << "---------華麗的分割線---------" << endl << endl;delete m;delete c1;delete c2;getchar();return 0; }

這個例子的中介模式，就是通過2個同事通過中介類去對話，這里每一個ConcreteColleague都認識ConcreteMediator，并且每一個ConcreteMediator認識所有的ConcreteColleague。

其中一個很有特點的代碼就是這個：

void ConcreteColleague1::send(const string &message) {m_mediator->send(message, this); }

隨后ConcreteMediator在根據傳過來的this，進行傳話。

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