#include <iostream>
#include <string>
#include <list>
using namespace std;
enum E_STATE {
OFF,
ON
};
/*
* observer: ボタン、LED
* subject: コントローラ
*/
// prototype
class Observer;
// 通知する人
class Subject {
public:
void AddObserver(Observer *observer);
void DelObserver(Observer *observer);
virtual void NotifyObserver();
protected:
list<Observer*> m_observers;
};
class Controller : public Subject {
public:
Controller() {
m_state = OFF;
}
virtual void NotifyObserver();
E_STATE GetState() {
return m_state;
}
void SetState(E_STATE state) {
m_state = state;
}
private:
E_STATE m_state;
};
/// 監視する人
class Observer {
public:
virtual void Update(Subject *subject) = 0;
};
class ButtonObserver : public Observer {
public:
ButtonObserver(Controller *controller) {
m_controller = controller;
m_controller->AddObserver(this);
}
virtual ~ButtonObserver() {
m_controller->DelObserver(this);
}
virtual void Update(Subject *subject) {
if (((Controller*)subject)->GetState() == ON) {
cout << "~ button vibration ~" << endl;
}
}
void Push() {
cout << "[Button Push]" << endl;
m_controller->SetState(ON);
m_controller->NotifyObserver();
}
void Release() {
cout << "[Button Release]" << endl;
m_controller->SetState(OFF);
m_controller->NotifyObserver();
}
private:
Controller *m_controller;
};
class LEDObserver : public Observer {
public:
LEDObserver(Controller *controller) {
m_controller = controller;
m_controller->AddObserver(this);
}
virtual ~LEDObserver() {
m_controller->DelObserver(this);
}
virtual void Update(Subject *subject) {
if (((Controller*)subject)->GetState() == ON) {
cout << "LED ON" << endl;
} else {
cout << "LED OFF" << endl;
}
}
private:
Controller *m_controller;
};
///////
void Subject::AddObserver(Observer *observer) {
m_observers.push_back(observer);
}
void Subject::DelObserver(Observer *observer) {
m_observers.push_back(observer);
}
void Subject::NotifyObserver() {
list<Observer*>::iterator it = m_observers.begin();
while (it != m_observers.end()) {
(*it++)->Update(this);
}
}
void Controller::NotifyObserver() {
list<Observer*>::iterator it = m_observers.begin();
while (it != m_observers.end()) {
(*it++)->Update(this);
}
}
/////
int main() {
Controller *cont = new Controller;
ButtonObserver *button = new ButtonObserver(cont);
LEDObserver *led = new LEDObserver(cont);
button->Push();
button->Release();
delete button;
delete led;
delete cont;
return 0;
}
参考サイト
最終更新：2011年12月06日 00:58
