abstract class LoggerFactory{
	public void writeLog(){
		Logger logger=this.createLogger();
		logger.writeLog();
	}
	public abstract LoggerFactory createLogger();
}

#include <iostream>
using namespace std;
//日记记录器接口：抽象产品
class Logger{
public:
	virtual void writeLog()=0;
};

//数据库日志记录器
class DatabaseLogger:public Logger{
public:
	void writeLog(){
		cout<<"数据库日志记录器"<<endl;
	}
};

//文件日志记录器：具体产品
class FileLogger:public Logger{
public:
	void writeLog(){
		cout<<"文件日志记录器"<<endl;
	}
};

//日志记录器工厂接口：抽象工厂
class LoggerFactory{
public:
	virtual Logger* createLogger()=0;
};

//数据库日志记录器工厂类：具体工厂
class DatabaseLoggerFactory:public LoggerFactory{
public:
	Logger* createLogger(){
		return new DatabaseLogger();
	}
};

//文件日志记录器工厂类：具体工厂
class FileLoggerFactory:public LoggerFactory{
public:
	Logger* createLogger(){
		return new FileLogger();
	}
};

//客户端测试代码

int main(){
	LoggerFactory *loggerFactory=new DatabaseLoggerFactory();
	Logger *logger=loggerFactory->createLogger();
	logger->writeLog();
	return 0;
}

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