subject.h

Head First 设计模式原书用的是JAVA写的代码

#pragma once

class CSubject
{
public:
	CSubject(void);
	~CSubject(void);
	virtual void registerObserver(CObserver *Observer)=0;
	virtual void removeObserver(CObserver *Observer)=0;
	virtual void notifyObservers()=0;
};

//static int MaxObservsersNum=100;
class CWeatherData :
	public CSubject
{
private:

	std::list  <CObserver*> Observers;
	float temperature;
	float humidity;
	float pressure;
public:
	CWeatherData(void);
	~CWeatherData(void);
	virtual void registerObserver(CObserver* Observer);
	virtual void removeObserver(CObserver* Observer);
	virtual void notifyObservers();
	void measurementsChanged();
	void setMeasurements(float temperature, float humidity, float pressure);
};