C++工厂方法模式(Factory Method Pattern)

最新推荐文章于 2025-03-03 22:36:07 发布

李御风

最新推荐文章于 2025-03-03 22:36:07 发布

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分类专栏：设计模式文章标签：设计模式

本文链接：https://blog.youkuaiyun.com/yufengli_/article/details/55107636

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本文深入探讨了C++中的工厂方法模式，这是一种创建型设计模式，它提供了一种创建对象的最佳方式。通过使用工厂方法，类可以将实例化过程推迟到子类中进行，使得代码更加灵活且易于扩展。

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#ifndef LOGGER_H
#define LOGGER_H

#include <iostream>
#include <string>
class Logger
{
    public:
        virtual void writeLog() = 0;
};

class DatabaseLogger : public Logger
{
    public:
        void writeLog() {
            std::cout << "DatabaseLogger" << std::endl; 
        }
};

class FileLogger : public Logger
{
    public:
        void writeLog() {
            std::cout << "FileLogger" << std::endl;
        }
};

class LoggerFactory
{
    public:
        virtual Logger* createLogger() = 0;
};

class DatabaseLoggerFactory : public LoggerFactory
{
    public:
        Logger* createLogger() {
            Logger* p = new DatabaseLogger;
            return p;
        }
};


class FileLoggerFactory : public LoggerFactory
{
    public:
        Logger* createLogger() {
            Logger* p = new FileLogger;
            return p;
        }

};


#endif

#include "Logger.h"

void test()
{
    LoggerFactory* pFileFactory = new FileLoggerFactory;
    Logger *pFile = pFileFactory->createLogger();
    pFile->writeLog();


    LoggerFactory* pDatabaseFactory = new DatabaseLoggerFactory;
    Logger *pDatabase = pDatabaseFactory->createLogger();
    pDatabase->writeLog();
    delete pFileFactory;
    delete pFile;
    delete pDatabaseFactory;
    delete pDatabase;
}
int main()
{
    test(); 
}

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