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OpenDX/prod_include/unknwn.h

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#pragma once
#include <windows.h>
#include <winerror.h>
#include <objbase.h>
struct IUnknown {
virtual HRESULT QueryInterface (REFIID riid, void **ppvObject) = 0;
virtual ULONG AddRef () = 0;
virtual ULONG Release () = 0;
};