#include <iostream>
#include <memory>
#include <string>


// 目标接口：新的日志接口
class Logger {
public:
    virtual ~Logger() {}
    virtual void logMessage(const std::string& message) const = 0;
};


// 现有接口：旧的日志系统
class OldLogger {
public:
    void writeLog(const std::string& msg) const {
        std::cout << "Old Logger: " << msg << std::endl;
    }
};


// 对象适配器类：将旧的日志系统适配为新的日志接口
class LoggerAdapter : public Logger {
private:
    std::shared_ptr<OldLogger> oldLogger;
public:
    LoggerAdapter(std::shared_ptr<OldLogger> oldLogger) : oldLogger(oldLogger) {}


    void logMessage(const std::string& message) const override {
        oldLogger->writeLog(message);
    }
};


// 类适配器类：将旧的日志系统适配为新的日志接口
class ClassLoggerAdapter : public Logger, private OldLogger {
public:
    void logMessage(const std::string& message) const override {
        writeLog(message);
    }
};


int main() {
    // 使用旧的日志系统
    std::shared_ptr<OldLogger> oldLogger = std::make_shared<OldLogger>();
    oldLogger->writeLog("Logging with the old logger");


    // 使用对象适配器将旧的日志系统适配为新的日志接口
    std::shared_ptr<Logger> logger = std::make_shared<LoggerAdapter>(oldLogger);
    logger->logMessage("Logging with the object adapter");


    // 使用类适配器将旧的日志系统适配为新的日志接口
    std::shared_ptr<Logger> classLogger = std::make_shared<ClassLoggerAdapter>();
    classLogger->logMessage("Logging with the class adapter");


    return 0;
}