#pragma once
#include "common.hpp"

class WaterHeater;

class Observer    // 观察者的抽象基类
{
public:
	virtual void Update(WaterHeater* waterHeater) const = 0;
};

class WashingMode :public Observer      // 观察者类
{
public:
	virtual void Update(WaterHeater* waterHeater) const;
};

class DrinkingMode :public Observer     // 观察者类
{
public:
	virtual void Update(WaterHeater* waterHeater) const;
};

class WaterHeater        // 被观察的类   
{
public:
	WaterHeater(int temperature = 25) :m_temperature(temperature) {};

	int getTempetature();
	void setTemperature(int temperature);

	virtual void HandleObserver();        // 通知观察者
	bool RegisterObserver(Observer* inObserver);      // 添加监听（观察）者
	bool UnRegisterObserver(Observer* inObserver);    // 删除监听（观察）者

protected:
	int m_temperature;
	vector<Observer*> m_Observers;
};