66 lines
1.4 KiB
C++
66 lines
1.4 KiB
C++
//----------------------------------------------------------------------------
|
|
//
|
|
// Copyright (C) Intel Corporation, 2006 - 2007.
|
|
//
|
|
// File: ObserverPattern.h
|
|
//
|
|
// Contents: An implementation of the Observer design pattern.
|
|
//
|
|
// Notes:
|
|
//----------------------------------------------------------------------------
|
|
#ifndef _OBSERVER_PATTERN_H__
|
|
#define _OBSERVER_PATTERN_H__
|
|
|
|
#include <vector>
|
|
|
|
using namespace std;
|
|
|
|
class Observer_Pattern_Observer
|
|
{
|
|
public:
|
|
Observer_Pattern_Observer() {}
|
|
virtual ~Observer_Pattern_Observer() {}
|
|
virtual int update() = 0;
|
|
};
|
|
|
|
class Observer_Pattern_Subject
|
|
{
|
|
public:
|
|
Observer_Pattern_Subject():observers() {}
|
|
|
|
virtual ~Observer_Pattern_Subject() {}
|
|
|
|
virtual int attach(Observer_Pattern_Observer * observer)
|
|
{
|
|
observers.push_back(observer);
|
|
return 0;
|
|
}
|
|
virtual int detach(Observer_Pattern_Observer * observer)
|
|
{
|
|
vector<Observer_Pattern_Observer *>::iterator iter;
|
|
for (iter = observers.begin(); iter != observers.end(); ++iter)
|
|
{
|
|
if (*iter == observer)
|
|
{
|
|
observers.erase(iter);
|
|
return 0;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
virtual int notify()
|
|
{
|
|
vector<Observer_Pattern_Observer *>::iterator iter;
|
|
for (iter = observers.begin(); iter != observers.end(); ++iter)
|
|
{
|
|
(*iter) -> update();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
private:
|
|
vector<Observer_Pattern_Observer *> observers;
|
|
};
|
|
|
|
#endif /* _OBSERVER_PATTERN_SUBJECT_H__ */
|