This class derives from CComClassFactory and uses CComObjectGlobal to construct a single object.
template<
class T
>
class CComClassFactorySingleton :
public CComClassFactory
Parameters
- T
Your class.
CComClassFactorySingleton derives from CComClassFactory and uses CComObjectGlobal to construct a single object. Each call to the CreateInstance method simply queries this object for an interface pointer.
Remarks
ATL objects normally acquire a class factory by deriving from CComCoClass. This class includes the macro DECLARE_CLASSFACTORY, which declares CComClassFactory as the default class factory. To use CComClassFactorySingleton, specify the DECLARE_CLASSFACTORY_SINGLETON macro in your object's class definition. For example:
class ATL_NO_VTABLE CMySingletonClass :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CMySingletonClass, &CLSID_MySingletonClass>,
public IMySingletonClass
{
public:
DECLARE_CLASSFACTORY_SINGLETON(CMySingletonClass)
// Remainder of class declaration omitted.
Requirements
Header: atlcom.h
See Also
Concepts
CComClassFactorySingleton Members