source/Lib/Observer.h

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#ifndef __OBSERVER_H__
#define __OBSERVER_H__

#include <list>
#include <iterator>

class Information
{
};

class Observer
{
public:
    virtual bool update(Information* i_pcInformation=0) = 0;
};



class Subject
{
public:
    Subject(){ }
    virtual ~Subject(){ }

    virtual void attach(Observer* i_pcObserver)
    {
        m_pcObserverList.push_back(i_pcObserver);
    }

    virtual void detach(Observer* i_pcObserver)
    {
        std::list<Observer*>::iterator a_Iterator;
        for(a_Iterator=m_pcObserverList.begin(); a_Iterator!=m_pcObserverList.end(); ++a_Iterator)
        {
            if( (*a_Iterator)==i_pcObserver ) m_pcObserverList.erase(a_Iterator);
        }
    }

    virtual bool hasObserver(Observer* i_pcObserver)
    {
        std::list<Observer*>::iterator a_Iterator;
        for(a_Iterator=m_pcObserverList.begin(); a_Iterator!=m_pcObserverList.end(); ++a_Iterator)
        {
            if( (*a_Iterator)==i_pcObserver ) return true;
        }

        return false;
    }

protected:
    virtual void notify(Information* i_pcInformation=0)
    {
        bool a_bRet=false;

        std::list<Observer*>::iterator a_Iterator;
        for(a_Iterator=m_pcObserverList.begin(); a_Iterator!=m_pcObserverList.end(); ++a_Iterator)
        {
            a_bRet = (*a_Iterator)->update(i_pcInformation);
        }
    }

    std::list<Observer*> m_pcObserverList;
private:

};

#endif  //__OBSERVER_H__