#include <windows.h>

extern GUID g_IID_Library;
extern unsigned short g_MajVerNo, g_MinVerNo;
extern LCID g_LCID;

/* The destructor is declared as virtual because we want all the destructors to be
   called even if delete X is applied to an object masquerading as a higher level class.
   To avoid this occupying space in the main vtable and thereby confusing OLE, the virtual 
   destructor is derived from a different base class. The method for returning a reference
   to the class ID is put here as well to avoid the main vtable ... */

struct VirtualDestructor
{
  virtual ~VirtualDestructor();
  virtual GUID & IID_This(void) = 0;
};

/* OLE automation classes may safely be derived from this one provided that the IID_Library for
   the type library is defined and the method IID_This() is implemented */

struct SimpleDispatch : IDispatch, VirtualDestructor
{
  unsigned long m_refs;

  SimpleDispatch(); // constructor sets ref count to one

// IUnknown methods ...
  HRESULT __stdcall QueryInterface(REFIID riid, void **ppv);
  unsigned long __stdcall AddRef(void);
  unsigned long __stdcall Release(void);
 
// IDispatch methods ...
  HRESULT __stdcall GetTypeInfoCount(unsigned int *pctinfo);
  HRESULT __stdcall GetTypeInfo(unsigned int itinfo, LCID lcid, ITypeInfo **pptinfo);
  HRESULT __stdcall GetIDsOfNames(REFIID riid, LPOLESTR *rgszNames,
      unsigned int cNames, LCID lcid, DISPID *rgdispid);
  HRESULT __stdcall Invoke(DISPID dispidMember, REFIID riid,
    LCID lcid, unsigned short wFlags, DISPPARAMS *pdispparams,
    VARIANT *pvarResult, EXCEPINFO *pexcepinfo, unsigned int *puArgErr);
};