观察者模式 C++11

#include <functional>
#include <vector>
#include <algorithm>
#include <iostream>
typedef std::function<void(int)> Func;

class Observer
{
public:
	void AddObserver(Func func)
	{
		m_vecFuncs.push_back(func);
	}

	void Notify(int i)
	{
		std::for_each(m_vecFuncs.begin(), m_vecFuncs.end(),
			[=](Func func){func(i); }
		);
	}

private:
	std::vector<Func> m_vecFuncs;
};

class Add
{
public:
	void operator()(int i, int b=0)
	{
		std::cout << i << std::endl;
	}
};

class Sub
{
public:
	void func(int i)
	{
		std::cout << i << std::endl;
	}
};

int main()
{
	Observer observer;
	observer.AddObserver(Add());

	Sub sub;
	observer.AddObserver(std::bind(&Sub::func, &sub, std::placeholders::_1));
	observer.Notify(1);
	observer.Notify(2);
}