69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Copyright (C) 1994-1998, Microsoft Corporation
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//
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// File: impiunk.hxx
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//
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// Contents: Inner IUnknown template.
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//
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// Templates: CImpIUnknown
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//
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// History: 22-May-97 emilyb created
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//
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//----------------------------------------------------------------------------
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#pragma once
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// NOTE: if IUnknown & _rControllingQuery is ever added to this
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// general case, then update CRowset to use this class.
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template <class T> class CImpIUnknown : public IUnknown
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{
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friend class T;
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public:
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CImpIUnknown( T * p) :
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_ref(0), _p(p)
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{};
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~CImpIUnknown() {};
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//
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// IUnknown methods.
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//
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STDMETHOD(QueryInterface) ( THIS_ REFIID riid,
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LPVOID *ppiuk )
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{
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SCODE sc= S_OK;
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if (IID_IUnknown == riid)
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*ppiuk = this;
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else
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sc = _p->RealQueryInterface(riid, ppiuk);
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if ( SUCCEEDED( sc) )
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((IUnknown *) *ppiuk)->AddRef();
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return sc;
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}
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STDMETHOD_(ULONG, AddRef) (THIS)
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{
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return InterlockedIncrement( (long *)&_ref );
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}
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STDMETHOD_(ULONG, Release) (THIS)
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{
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long l = InterlockedDecrement( (long *)&_ref );
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if ( l <= 0 )
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{
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delete _p;
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return 0;
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}
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return l;
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}
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private:
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long _ref; // OLE reference count
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T * _p;
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};
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