#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);

}