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Compiler Warning (level 1) C4997

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'class': coclass does not implement a COM interface or pseudo-interface

A class marked with the coclass attribute did not implement an interface.

The following sample generates C4997:

// C4997.cpp
// compile with: /WX
// to resolve this C4997, uncomment all code
#include <objbase.h>

[ object ]
__interface I {
   HRESULT func();
};

[ coclass ]
struct C /*: I*/ {
   /*
   HRESULT func() {
      return S_OK;
   }
   */
};   // C4997