public delegate double Handler(double wages);

    public class Manager
    {
        public double GetWages(double basicWages)
        {
            double totalWages = 1.6 * basicWages;
            Console.WriteLine("Manager's wages is : " + totalWages);
            return totalWages;
        }
    }

    public class Employee
    {
        public double GetWages(double basicWages)
        {
            double totalWages = 1.2 * basicWages;
            Console.WriteLine("Employee's wages is : " + totalWages);
            return totalWages;
        }
    }
    public class Observe
    {

        public Handler WageHandler { get; set; }

        //通过GetInvodationList方法获取多路广播委托列表，如果观察者数量大于0即执行方法
        public void Execute(double basicWages)
        {
            if (WageHandler != null)
                if (WageHandler.GetInvocationList().Count() > 0)
                    WageHandler(basicWages);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Observe wageManager = new Observe();
            //加入Manager观察者
            wageManager.WageHandler += new Handler(new Manager().GetWages);

            //加入Employee观察者
            wageManager.WageHandler += new Handler(new Employee().GetWages);

            //同时加入底薪3000元，分别进行计算
            wageManager.Execute(3000);
            Console.ReadKey();
        }
    }

#include "stdafx.h"
using namespace std;

typedef double(*Handler)(double wages);//定义函数指针，功能和C#中的委托类似

class Manager
{
public:
    static double GetWages(double basicWages) {
        double totalWages = 1.6*basicWages;
        cout << "Manager's wages is : " << totalWages << endl;
        return totalWages;
    }
};
class Employee
{
public:
    static double GetWages(double basicWages) {
        double totalWages = 1.2*basicWages;
        cout << "Employee's wages is : " << totalWages << endl;
        return totalWages;
    }
};

class Observe
{
public:
    set<Handler> set;
    //加入观察者
    void Attach(Handler wageHandler1) {
        set.insert(wageHandler1);
    }
    //删除观察者
    void Detach(Handler wageHandler1) {
        set.erase(wageHandler1);
    }
    void Execute(double basicWages) {
        if (NULL != &set)
        {
            if (set.size() > 0)
            {
                typename std::set<Handler>::iterator it;//list<T>前面需要用typename限定一下，因为编译器不知道list<T>::iterator是代表一个类型。list<T>::iterator iter; 改为 typename std::list<T>::iterator iter;
                for (it = set.begin(); it != set.end(); it++)
                {
                    (*it)(basicWages);
                }
            }
        }
    }
};

int main()
{
    Manager man;
    Employee emp;
    Observe observe;
    //加入Manager观察者
    Handler managerHandler = &(man.GetWages);
    observe.Attach(managerHandler);
    //加入Employee观察者
    Handler employeeHandler = &(emp.GetWages);
    observe.Attach(employeeHandler);

    //同时加入底薪3000元，分别进行计算
    observe.Execute(3000);

    system("pause");
    return 0;
}