how to create a global singleton object in exe

最新推荐文章于 2021-08-23 21:36:53 发布

mickeyfirst

最新推荐文章于 2021-08-23 21:36:53 发布

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分类专栏： [--003.1] Symbian 文章标签： object delete exe

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本文介绍了一种在软件开发中创建全局单例对象的方法。通过使用线程局部存储（TLS）来实现跨线程的单例模式，确保了对象的唯一性。在构造和析构函数中对TLS进行了初始化和清理。

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// how to create a global singleton object
const TInt KMarkTlsHandle = 0xC0FFEE;

class CYourClass: public CBase
{
public:
  CYourClass(){};
  void ConstructL(){};
  ~CYourClass();
};

CYourClass::~CYourClass()
{

//release TLS
UserSvr::DllFreeTls(KMarkTlsHandle);
}

//how to create a global singleton object
void CMarkEComWrapper::DoCommandCreateSingletonObject()
{
TInt err = KErrNone;

//Get object from STL
CYourClass* iSingletonObject = static_cast<CYourClass*> (UserSvr::DllTls(KMarkTlsHandle));

//if not, create one
if (!iSingletonObject)
  {
  iSingletonObject = new (ELeave) CYourClass;
  CleanupStack::PushL(iSingletonObject);
  iSingletonObject->ConstructL();
  err = UserSvr::DllSetTls( KMarkTlsHandle, iSingletonObject );
  CleanupStack::Pop(iSingletonObject);
  }

delete iSingletonObject ;

iSingletonObject = 0;
}