#include #include #include using namespace std; enum class enmLoggerLevel { Log_Level_Info = 1, Log_Level_Warning = 2, Log_Level_Error = 3, }; class logger { public: logger() : m_nextLogger(nullptr) {} void setNextLogger(shared_ptr nextLogger) { m_nextLogger = nextLogger; } static shared_ptr getLogger(enmLoggerLevel enmLogger); virtual void log(string message) = 0; protected: shared_ptr m_nextLogger; }; class loggerInfo : public logger { public: loggerInfo() {} void log(string message) { cout << "Info : " << message << endl; if (m_nextLogger) m_nextLogger->log(message); } }; class loggerWarning : public logger { public: loggerWarning() {} void log(string message) { cout << "Warning : " << message << endl; if (m_nextLogger) m_nextLogger->log(message); } }; class loggerError : public logger { public: loggerError() {} void log(string message) { cout << "Error : " << message << endl; if (m_nextLogger) m_nextLogger->log(message); } }; shared_ptr logger::getLogger(enmLoggerLevel enmLogger = enmLoggerLevel::Log_Level_Info) { shared_ptr pLoggerInfo = make_shared(); shared_ptr pLoggerWarning = make_shared(); shared_ptr pLoggerError = make_shared(); pLoggerError->setNextLogger(pLoggerWarning); pLoggerWarning->setNextLogger(pLoggerInfo); if (enmLogger == enmLoggerLevel::Log_Level_Error) return pLoggerError; else if (enmLogger == enmLoggerLevel::Log_Level_Warning) return pLoggerWarning; return pLoggerInfo; } int main() { vector vecLoggerLevels{enmLoggerLevel::Log_Level_Error,enmLoggerLevel::Log_Level_Warning,enmLoggerLevel::Log_Level_Info}; for (auto& level : vecLoggerLevels) { shared_ptr myLogger = logger::getLogger(level); myLogger->log("Hello"); cout << endl << endl; } return 0; }

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