ATL Internals: Working with ATL 8, Second Edition

The Core of IUnknown

Standalone Reference Counting

To encapsulate the Lock and Unlock methods as well as the “just thread-safe enough” reference counting, ATL provides the CComObjectRootEx base class, parameterized by the desired threading model^[4]:

template <class ThreadModel>                                                 class CComObjectRootEx : public CComObjectRootBase {                         public:                                                                          typedef ThreadModel _ThreadModel;                                            typedef typename _ThreadModel::AutoCriticalSection _CritSec;                 typedef typename _ThreadModel::AutoDeleteCriticalSection _AutoDelCritSec;    typedef CComObjectLockT<_ThreadModel> ObjectLock;                         ...