Strange behavior

[yvad]

John C Wrote:

> yvad Wrote:
> 
> > QueryInterface of type HRESULTWindows (GUID * riidriid, out void* ppvObject ppvObject) overrides but is not covariant with QueryInterface of type HRESULT(GUID * riidriid, void* ppvObject ppvObject) 
> 
> I'm surprised that's the error you get. Copying your code (and filling in the blanks) I instead get an error about an undefined symbol. You need to mark QueryInterface in AbstractUnknown as abstract.

I tried. Same error