idog2.h

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// Forward declaration
typedef struct IDog IDog;

// Vtable structure
typedef struct
{
   // IUnknown methods
   HRESULT (*QueryInterface )(IDog   *this,
                              REFIID riid,
                              void   **ppvObject);
   ULONG   (*AddRef )(IDog *this);
   ULONG   (*Release )(IDog *this);

   // IDog methods
   HRESULT (*Bark)(void);
   HRESULT (*Scratch)(void);
   HRESULT (*Sleep)(void);
   HRESULT (*Eat)(void);
   BOOL    (*IsHungry)(void);

} IDogVtable;

// The actual IDog interface structure
typedef struct
{
   struct IDogVtable *lpVtable;
} IDog;