#include #include #include #include using namespace std; static int _intCnt = 1; class IObserver { public: IObserver(string strName) : m_intId(_intCnt), m_strName(strName) { ++_intCnt; } virtual ~IObserver() = default; string GetName() { return m_strName; } int GetId() { return m_intId; } virtual void notify(const string& strMsg) = 0; private: int m_intId; string m_strName; }; class Indviduals : public IObserver { public: Indviduals(const string strName) : IObserver(strName) {} void notify(const string& strMsg){ cout << "Employee Id : " << GetId() << " Name : " << GetName() << " Information recieved: " << strMsg << endl; } }; class ISubject { public: virtual ~ISubject() = default; void AddSubscriber(shared_ptr pSubscriber) { m_vecSubscribers.push_back(pSubscriber); } void RemoveSubscriber(shared_ptr pSubscriber) { auto itr = find(m_vecSubscribers.begin(),m_vecSubscribers.end(),pSubscriber); m_vecSubscribers.erase(itr); } vector>& getSubscribers() {return m_vecSubscribers;} virtual void notify(const string& strMsg) = 0; private: vector> m_vecSubscribers; }; class TeamIT : public ISubject { public: void setInformationRecieved(const string& str){ notify(str);} private: void notify(const string& strMsg){ for(const auto& pSubscriber : getSubscribers()) pSubscriber->notify(strMsg); } }; int main() { string msg1(" Start Maintenance..!"); string msg2(" Maintenance Completed..!"); shared_ptr spITTeam = make_shared(); shared_ptr spIT1 = make_shared("IT Employee 1"); shared_ptr spIT2 = make_shared("IT Employee 2"); shared_ptr spIT3 = make_shared("IT Employee 3"); spITTeam->AddSubscriber(spIT1); spITTeam->AddSubscriber(spIT2); spITTeam->AddSubscriber(spIT3); spITTeam->setInformationRecieved(msg1); cout << endl << endl; shared_ptr spIT4 = make_shared("IT Employee 4"); spITTeam->RemoveSubscriber(spIT2); spITTeam->AddSubscriber(spIT4); spITTeam->setInformationRecieved(msg2); return 0; }

Observer_Pattern