39 lines
1.5 KiB
C++
39 lines
1.5 KiB
C++
// Copyright (c) 1999 Microsoft Corporation. All rights reserved.
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//
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// Helper classes for implementing IUnknown.
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//
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#pragma once
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// Implements AddRef/Release with ref count beginning at 1. Also handles module locking.
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class ComRefCount
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: public IUnknown
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{
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public:
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ComRefCount();
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virtual ~ComRefCount() {}
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// IUnknown
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STDMETHOD_(ULONG, AddRef)();
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STDMETHOD_(ULONG, Release)();
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private:
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long m_cRef;
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};
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// Use this macro to declare AddRef and Release in the public section of your derived class. This is necessary because
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// the IUnknown section of any interfaces aren't linked to the methods in this base class.
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#define ComRefCountAddRefRelease STDMETHOD_(ULONG, AddRef)() { return ComRefCount::AddRef(); } STDMETHOD_(ULONG, Release)() { return ComRefCount::Release(); }
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// Implements QueryInterface for a single interface (in addition to IUnknown). You must pass the IID of your interface (iidExpected)
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// and a pointer to that interface (pvInterface).
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class ComSingleInterface
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: public ComRefCount
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{
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public:
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STDMETHOD(QueryInterface)(const IID &iid, void **ppv, const IID&iidExpected, void *pvInterface);
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};
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// Use this macro to declare AddRef, Release, and QueryInterface function in the public section of your derived class.
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#define ComSingleInterfaceUnknownMethods(IMyInterface) ComRefCountAddRefRelease STDMETHOD(QueryInterface)(const IID &iid, void **ppv) { return ComSingleInterface::QueryInterface(iid, ppv, IID_##IMyInterface, static_cast<IMyInterface*>(this)); }
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