#include #include using namespace std; static int _intCnt = 1; class IEmployee { public: IEmployee(string strName) : m_intId(_intCnt), m_strName(strName), m_ptrNextApprover(nullptr) { ++_intCnt; } void setNextApprover(shared_ptr& ptrNextApprover) { m_ptrNextApprover = ptrNextApprover; } virtual void HandleRequest(string strMsg,int intAmount) = 0; protected: int m_intId; string m_strName; shared_ptr m_ptrNextApprover; virtual void PrintDetails() = 0; }; class Level1Approver : public IEmployee { public: Level1Approver(string name) : IEmployee(name) {} void PrintDetails() { cout << " A Manager here.! Name : " << m_strName << " ID : " << m_intId << " "; } void HandleRequest(string strMsg, int intAmount) { PrintDetails(); cout << "Let me go through request : " << strMsg << endl; if (intAmount < 20000) { cout << "Approved...!" << endl; } else { if (m_ptrNextApprover) { cout << "Let me pass it to next approver...\n"; m_ptrNextApprover->HandleRequest(strMsg, intAmount); } else cout << "Could you please setup a meeting to discuss...?\n"; } } }; class Level2Approver : public IEmployee { public: Level2Approver(string name) : IEmployee(name) {} void PrintDetails() { cout << " A Director here.! Name : " << m_strName << " ID : " << m_intId << " "; } void HandleRequest(string strMsg, int intAmount) { PrintDetails(); cout << "Let me go through request : " << strMsg << endl; if (intAmount < 40000) { cout << "Approved...!" << endl; } else { if (m_ptrNextApprover) { cout << "Let me pass it to next approver...\n"; m_ptrNextApprover->HandleRequest(strMsg, intAmount); } else cout << "Could you please setup a meeting to discuss...?\n"; } } }; class Level3Approver : public IEmployee { public: Level3Approver(string name) : IEmployee(name) {} void PrintDetails() { cout << " A Vice President here.! Name : " << m_strName << " ID : " << m_intId << " "; } void HandleRequest(string strMsg, int intAmount) { PrintDetails(); cout << "Let me go through request : " << strMsg << endl; if (intAmount < 50000) { cout << "Approved...!" << endl; } else { if (m_ptrNextApprover) { cout << "Let me pass it to next approver...\n"; m_ptrNextApprover->HandleRequest(strMsg, intAmount); } else cout << "Could you please setup a meeting to discuss...?\n"; } } }; int main() { //This is one time level preparation shared_ptr ptrLevel1 = make_shared("A"); shared_ptr ptrLevel2 = make_shared("B"); shared_ptr ptrLevel3 = make_shared("C"); ptrLevel1->setNextApprover(ptrLevel2); ptrLevel2->setNextApprover(ptrLevel3); //This is one time level preparation //all request passed to first level and it will be handled properly internaly based on encapsulated logic. User do not need to pass it to proper approver //client is not worried about internal logic ptrLevel1->HandleRequest("Team outing", 15000); cout << "--------------------------------------\n"; ptrLevel1->HandleRequest("Foriegn travel for project", 30000); cout << "--------------------------------------\n"; ptrLevel1->HandleRequest("Project license extensions", 45000); cout << "--------------------------------------\n"; ptrLevel1->HandleRequest("New Development centre", 1000000); cout << "--------------------------------------\n"; ptrLevel1->HandleRequest("Client welcome lunch", 5000); cout << "--------------------------------------\n"; return 0; }

Chain Of Responsibility