63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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#ifndef _CAGGUNK_H
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#define _CAGGUNK_H
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class CAggregatedUnknown : public IUnknown
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{
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public:
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// *** IUnknown ***
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virtual STDMETHODIMP QueryInterface(REFIID riid, void **ppvObj);
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virtual STDMETHODIMP_(ULONG) AddRef(void);
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virtual STDMETHODIMP_(ULONG) Release(void);
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protected:
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virtual ~CAggregatedUnknown(); // so that subclasses get deleted right
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CAggregatedUnknown(IUnknown *punkAgg);
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// This is the IUnknown that subclasses returns from their CreateInstance func
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IUnknown* _GetInner() { return &_unkInner; }
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// A couple helper functions for subclasses to cache their aggregator's
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// (or their own) interfaces.
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void _ReleaseOuterInterface(IUnknown** ppunk);
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HRESULT _QueryOuterInterface(REFIID riid, void ** ppvOut);
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// Do non-cached QIs off this IUnknown
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IUnknown* _GetOuter() { return _punkAgg; }
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// Allow "delayed aggregation"
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void _SetOuter(IUnknown* punk) { _punkAgg = punk; }
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// This is the QueryInterface the aggregator implements
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virtual HRESULT v_InternalQueryInterface(REFIID riid, void **ppvObj) = 0;
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virtual BOOL v_HandleDelete(PLONG pcRef) { return FALSE; };
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private:
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// Get a non-refcounted pointer to the canonical IUnknown of the
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// controlling unknown. Used by _QueryOuterInterface and
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// _ReleaseOuterInterface.
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IUnknown *_GetCanonicalOuter(void);
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// Embed default IUnknown handler
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class CUnkInner : public IUnknown
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{
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public:
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virtual STDMETHODIMP QueryInterface(REFIID riid, void **ppvObj);
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virtual STDMETHODIMP_(ULONG) AddRef(void) ;
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virtual STDMETHODIMP_(ULONG) Release(void);
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CUnkInner() { _cRef = 1; }
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private:
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LONG _cRef;
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};
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friend class CUnkInner;
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CUnkInner _unkInner;
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IUnknown* _punkAgg; // points to _unkInner or aggregating IUnknown
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};
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#define RELEASEOUTERINTERFACE(p) _ReleaseOuterInterface((IUnknown**)((void **)&p))
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#endif // _CAGGUNK_H
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