102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
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//*********************************************************************
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//* Microsoft Windows **
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//* Copyright(c) Microsoft Corp., 1999 **
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//*********************************************************************
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//
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// CUNKNOWN.H - Header file for IUnknown Implementation.
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//
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// HISTORY:
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//
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// 1/27/99 a-jaswed Created.
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//
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// IUnknown Implementation.
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#ifndef __CUnknown_h__
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#define __CUnknown_h__
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#include <objbase.h>
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///////////////////////////////////////////////////////////
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// Nondelegating version of IUnknown.
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//
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struct INondelegatingUnknown
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{
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virtual HRESULT __stdcall
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NondelegatingQueryInterface(const IID& iid, void** ppv) = 0;
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virtual ULONG __stdcall NondelegatingAddRef() = 0;
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virtual ULONG __stdcall NondelegatingRelease() = 0;
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};
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/////////////////////////////////////////////////////////////////////
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// Declaration of CUnknown
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//
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// Base class for implementing IUnknown.
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//
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class CUnknown : public INondelegatingUnknown
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{
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public:
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// Internal IUnknown Implementation...
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virtual HRESULT __stdcall NondelegatingQueryInterface( const IID&,
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void**) ;
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virtual ULONG __stdcall NondelegatingAddRef() ;
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virtual ULONG __stdcall NondelegatingRelease();
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// Constructor
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CUnknown(IUnknown* pOuterUnknown) ;
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// Destructor
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virtual ~CUnknown() ;
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// Initialization (esp for aggregates)
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virtual HRESULT Init()
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{return S_OK;}
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// Notify derived classes that we are releasing.
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virtual void FinalRelease() ;
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// Support for delegation
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IUnknown* GetOuterUnknown() const
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{ return m_pOuterUnknown; }
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// Count of currently active components.
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static long ActiveComponents()
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{return s_cActiveComponents;}
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// QueryInterface Helper Function
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HRESULT FinishQI(IUnknown* pI, void** ppv) ;
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private:
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// Reference Count for this object.
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long m_cRef;
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// Outer IUnknown pointer.
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IUnknown* m_pOuterUnknown;
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// Count of all active instances.
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static long s_cActiveComponents ;
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} ;
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///////////////////////////////////////////////////////////
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// Delegating IUnknown -
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//
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// Delegates to the nondelegating IUnknown interface if
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// not aggregated. If aggregated, delegates to the outer unknown.
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//
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#define DECLARE_IUNKNOWN \
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virtual HRESULT __stdcall \
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QueryInterface(const IID& iid, void** ppv) \
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{ \
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return GetOuterUnknown()->QueryInterface(iid,ppv); \
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}; \
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virtual ULONG __stdcall AddRef() \
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{ \
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return GetOuterUnknown()->AddRef(); \
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}; \
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virtual ULONG __stdcall Release() \
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{ \
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return GetOuterUnknown()->Release(); \
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};
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#endif
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