实现含有三个同事类的中介者模式的示例C++代码添加中文注释，其中每个同事可以向其他一个或两个同事发送消息。

以下是一个简单的中介者模式示例代码，实现了三个同事类：

#include <iostream>
#include <string>
using namespace std;

class Colleague;

// 中介者类
class Mediator {
public:
    virtual void sendMessage(Colleague* colleague, string message) = 0;
};

// 同事类
class Colleague {
protected:
    Mediator* mediator;
public:
    Colleague(Mediator* m) {
        mediator = m;
    }
    virtual void sendMessage(string message) = 0;
    virtual void receiveMessage(string message) = 0;
};

// 具体同事类A
class ColleagueA : public Colleague {
public:
    ColleagueA(Mediator* m) : Colleague(m) {}
    void sendMessage(string message) override {
        cout << "同事A发送了消息：" << message << endl;
        mediator->sendMessage(this, message);
    }
    void receiveMessage(string message) override {
        cout << "同事A收到了消息：" << message << endl;
    }
};

// 具体同事类B
class ColleagueB : public Colleague {
public:
    ColleagueB(Mediator* m) : Colleague(m) {}
    void sendMessage(string message) override {
        cout << "同事B发送了消息：" << message << endl;
        mediator->sendMessage(this, message);
    }
    void receiveMessage(string message) override {
        cout << "同事B收到了消息：" << message << endl;
    }
};

// 具体同事类C
class ColleagueC : public Colleague {
public:
    ColleagueC(Mediator* m) : Colleague(m) {}
    void sendMessage(string message) override {
        cout << "同事C发送了消息：" << message << endl;
        mediator->sendMessage(this, message);
    }
    void receiveMessage(string message) override {
        cout << "同事C收到了消息：" << message << endl;
    }
};

// 具体中介者类
class ConcreteMediator : public Mediator {
private:
    ColleagueA* colleagueA;
    ColleagueB* colleagueB;
    ColleagueC* colleagueC;
public:
    void setColleagueA(ColleagueA* a) {
        colleagueA = a;
    }
    void setColleagueB(ColleagueB* b) {
        colleagueB = b;
    }
    void setColleagueC(ColleagueC* c) {
        colleagueC = c;
    }
    void sendMessage(Colleague* colleague, string message) override {
        if (colleague == colleagueA) {
            colleagueB->receiveMessage(message);
            colleagueC->receiveMessage(message);
        } else if (colleague == colleagueB) {
            colleagueA->receiveMessage(message);
            colleagueC->receiveMessage(message);
        } else if (colleague == colleagueC) {
            colleagueA->receiveMessage(message);
            colleagueB->receiveMessage(message);
        }
    }
};

int main() {
    ConcreteMediator* mediator = new ConcreteMediator();
    ColleagueA* colleagueA = new ColleagueA(mediator);
    ColleagueB* colleagueB = new ColleagueB(mediator);
    ColleagueC* colleagueC = new ColleagueC(mediator);
    mediator->setColleagueA(colleagueA);
    mediator->setColleagueB(colleagueB);
    mediator->setColleagueC(colleagueC);

    colleagueA->sendMessage("大家好啊！");
    colleagueB->sendMessage("你们好！");
    colleagueC->sendMessage("hello world！");

    delete mediator;
    delete colleagueA;
    delete colleagueB;
    delete colleagueC;
    return 0;
}

上述代码实现了含有三个同事类的中介者模式，其中每个同事可以向其他一个或两个同事发送消息。在具体中介者类中，根据接收到消息的同事对象不同，将消息转发给其他同事。在 main 函数中，创建了一个具体中介者对象和三个具体同事对象，将它们注册到中介者对象中，并且通过具体同事类的 sendMessage 函数向其他同事发送消息。