Re: IUnknown

Hi Giovanni,

Here is the related part of code, you can see QueryInterface has two forms
of implementation, one is pure virtual function, the other is not. From
traditional COM book, QueryInterface should be a pure virtual function.
Correct me if I am wrong.

So, here is what I mean fuzzy code which makes me confused whether
QueryInterface is pure virtual method or not. :-)

Any ideas?

        IUnknown
        {
        public:
            BEGIN_INTERFACE
            virtual HRESULT STDMETHODCALLTYPE QueryInterface(
                /* [in] */ REFIID riid,
                /* [iid_is][out] */ void __RPC_FAR *__RPC_FAR *ppvObject) = 0;
            
            virtual ULONG STDMETHODCALLTYPE AddRef( void) = 0;
            
            virtual ULONG STDMETHODCALLTYPE Release( void) = 0;
    
            template<class Q>
     HRESULT STDMETHODCALLTYPE QueryInterface(Q** pp)
     {
     return QueryInterface(__uuidof(Q), (void **)pp);
     }

regards,
George

"Giovanni Dicanio" wrote: