subject.cpp

来自「Head First 设计模式原书用的是JAVA写的代码」· C++ 代码 · 共 62 行

#include "StdAfx.h"
#include ".\subject.h"

CSubject::CSubject(void)
{
}

CSubject::~CSubject(void)
{
}
//void CSubject::registerObserver(CObserver *Observer)
//{
//	cout<<" This is CSubject::registerObserver()\n";
//}
//void CSubject::removeObserver(CObserver *Observer)
//{
//	cout<<" This is CSubject::removeObserver()\n";
//}
//void CSubject::notifyObservers()
//{
//	cout<<" This is CSubject::notifyObservers()\n";
//}

CWeatherData::CWeatherData(void)
{
}

CWeatherData::~CWeatherData(void)
{
}
void CWeatherData::registerObserver(CObserver* Observer)
{
	Observers.push_back(Observer);	
}
void CWeatherData::removeObserver(CObserver* Observer)
{
	if(!Observers.empty())
	{		
		Observers.remove(Observer);//存在问题不能够用＝＝比较两个观察者是否相同
	}
	else
		cout<<"No Observer!\n";
}
void CWeatherData::notifyObservers()
{
	list <CObserver*>::iterator Iter;
	for (Iter=Observers.begin();Iter!=Observers.end();Iter++)
	{
		(*Iter)->update(temperature, humidity, pressure);
	}
}
void CWeatherData::measurementsChanged()
{
	notifyObservers();
}
void CWeatherData::setMeasurements(float tem, float hum, float pre)
{
	temperature=tem;
	humidity=hum;
	pressure=pre;
	measurementsChanged();
}