55 lines
1.3 KiB
C++
55 lines
1.3 KiB
C++
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//
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// Copyright (c) Microsoft Corporation. All rights reserved
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#pragma once
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template<class T, class InterfaceT> class SampleUnknownImpl : public T
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{
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public:
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SampleUnknownImpl()
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{
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m_RefCount = 0;
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}
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virtual HRESULT STDMETHODCALLTYPE QueryInterface (
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REFIID riid,
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void __RPC_FAR *__RPC_FAR *ppvObject )
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{
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if ( riid == __uuidof ( IUnknown ) )
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{
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*ppvObject = this;
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AddRef();
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return S_OK;
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}
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else if ( riid == __uuidof ( InterfaceT ) )
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{
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*ppvObject = this;
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AddRef();
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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virtual ULONG STDMETHODCALLTYPE AddRef ( void )
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{
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return InterlockedIncrement ( &m_RefCount );
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}
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virtual ULONG STDMETHODCALLTYPE Release ( void )
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{
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LONG newCount = InterlockedDecrement ( &m_RefCount );
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if ( 0 == newCount )
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{
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delete this;
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}
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return newCount;
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}
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private:
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volatile LONG m_RefCount;
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};
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