63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
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/*
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*
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* Copyright (c) 1998,1999 Microsoft Corporation. All rights reserved.
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* EXEMPT: copyright change only, no build required
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*
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*/
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#ifndef _UNKNOWN_HXX
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#define _UNKNOWN_HXX
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#pragma once
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#include "fusionlastwin32error.h"
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//===========================================================================
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// This template implements the IUnknown portion of a given COM interface.
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template <class I, const IID* I_IID> class _unknown : public I
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{
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private: long _refcount;
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public:
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_unknown()
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{
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_refcount = 0;
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}
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virtual ~_unknown()
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{
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}
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virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void ** ppvObject)
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{
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if (riid == IID_IUnknown)
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{
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*ppvObject = static_cast<IUnknown*>(this);
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}
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else if (riid == *I_IID)
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{
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*ppvObject = static_cast<I*>(this);
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}
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reinterpret_cast<IUnknown*>(*ppvObject)->AddRef();
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return S_OK;
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}
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virtual ULONG STDMETHODCALLTYPE AddRef( void)
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{
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return InterlockedIncrement(&_refcount);
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}
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virtual ULONG STDMETHODCALLTYPE Release( void)
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{
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DWORD dwError = ::FusionpGetLastWin32Error();
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if (InterlockedDecrement(&_refcount) == 0)
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{
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delete this;
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::FusionpSetLastWin32Error( dwError );
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return 0;
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}
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::FusionpSetLastWin32Error( dwError );
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return _refcount;
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}
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};
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#endif _UNKNOWN_HXX
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