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