单例模式

最新推荐文章于 2025-05-23 19:33:43 发布

原创最新推荐文章于 2025-05-23 19:33:43 发布 · 218 阅读

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本文介绍了如何在C++中使用标准库和CMutex实现一个线程安全的单例模式，确保在多线程环境中正确地创建和访问实例。

#ifndef __SINGLETON_H
#define __SINGLETON_H

#pragma warning(push)
#pragma warning(disable:4251)

#include"afxmt.h"
#include <memory>
class Singleton
{
static std::auto_ptr<Singleton> m_pInstance;
protected:
Singleton(){};
//static std::mutex m_Mutex;
static CMutex m_Mutex;
public:
~Singleton(){}
//Return this singleton class' instance pointer
static Singleton* Instance()
{
if(NULL == m_pInstance.get())
{
//加锁
m_Mutex.Lock();

if(NULL == m_pInstance.get())
{
m_pInstance = std::auto_ptr<Singleton>(new Singleton());
}
m_Mutex.Unlock();
}
return m_pInstance.get();
}
};

#define DEFINE_SINGLETON_PUB(cls)\
private:\
static std::auto_ptr<cls> m_pInstance;\
protected:\
cls(){}\
public:\
~cls(){}\
static cls* Instance(){\
if(!m_pInstance.get()){\
m_pInstance = std::auto_ptr<cls>(new cls());\
}\
return m_pInstance.get();\
}
#define IMPLEMENT_SINGLETON_PUB(cls) \
std::auto_ptr<cls> cls::m_pInstance(NULL);

//your declarations that cause 4251
#pragma warning(pop)
#endif