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#ifndef __CUnknown_h__
#define __CUnknown_h__
#include <objbase.h>
///////////////////////////////////////////////////////////
//
// Nondelegating IUnknown interface
// - Nondelegating version of IUnknown
//
interface INondelegatingUnknown
{
virtual HRESULT __stdcall
NondelegatingQueryInterface(const IID& iid, void** ppv) = 0 ;
virtual ULONG __stdcall NondelegatingAddRef() = 0 ;
virtual ULONG __stdcall NondelegatingRelease() = 0 ;
} ;
///////////////////////////////////////////////////////////
//
// Declaration of CUnknown
// - Base class for implementing IUnknown
//
class CUnknown : public INondelegatingUnknown
{
public:
// Nondelegating IUnknown implementation
virtual HRESULT __stdcall NondelegatingQueryInterface(const IID&,
void**) ;
virtual ULONG __stdcall NondelegatingAddRef() ;
virtual ULONG __stdcall NondelegatingRelease() ;
// Constructor
CUnknown(IUnknown* pUnknownOuter) ;
// Destructor
virtual ~CUnknown() ;
// Initialization (especially for aggregates)
virtual HRESULT Init() { return S_OK ;}
// Notification to derived classes that we are releasing
virtual void FinalRelease() ;
// Count of currently active components
static long ActiveComponents()
{ return s_cActiveComponents ;}
// Helper function
HRESULT FinishQI(IUnknown* pI, void** ppv) ;
protected:
// Support for delegation
IUnknown* GetOuterUnknown() const
{ return m_pUnknownOuter ;}
private:
// Reference count for this object
long m_cRef ;
// Pointer to (external) outer IUnknown
IUnknown* m_pUnknownOuter ;
// Count of all active instances
static long s_cActiveComponents ;
} ;
///////////////////////////////////////////////////////////
//
// Delegating IUnknown
// - Delegates to the nondelegating IUnknown, or to the
// outer IUnknown if the component is aggregated.
//
#define DECLARE_IUNKNOWN \
virtual HRESULT __stdcall \
QueryInterface(const IID& iid, void** ppv) \
{ \
return GetOuterUnknown()->QueryInterface(iid,ppv) ; \
} ; \
virtual ULONG __stdcall AddRef() \
{ \
return GetOuterUnknown()->AddRef() ; \
} ; \
virtual ULONG __stdcall Release() \
{ \
return GetOuterUnknown()->Release() ; \
} ;
///////////////////////////////////////////////////////////
#endif
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