//
// Math.h 
//

// access to the global variables
extern DWORD g_dwObjs;
extern DWORD g_dwLocks;


const DISPID_ADD = 1;
const DISPID_SUBTRACT = 2;
const DISPID_MULTIPLY = 3;
const DISPID_DIVIDE = 4;

class Math : public IMath
{
protected:
   // Reference count
   DWORD          m_dwRef;

public:
   Math();
   ~Math();

public:
   // IUnknown
   STDMETHOD(QueryInterface( REFIID, void** ));
   STDMETHOD_(ULONG, AddRef());
   STDMETHOD_(ULONG, Release());

   // IDispatch
   STDMETHOD(GetTypeInfoCount( UINT* pctinfo ));
   STDMETHOD(GetTypeInfo( UINT itinfo,
                            LCID lcid,
                            ITypeInfo** pptinfo ));
   STDMETHOD(GetIDsOfNames( REFIID riid,
                            OLECHAR** rgszNames,
                            UINT cNames,
                            LCID lcid,
                            DISPID* rgdispid ));
   STDMETHOD(Invoke( DISPID dispid,
                        REFIID riid,
                        LCID lcid,
                        WORD wFlags,
                        DISPPARAMS FAR* pDispParams,
                        VARIANT FAR* pvarResult,
                        EXCEPINFO FAR* pExcepInfo,
                        unsigned int FAR* puArgErr ));

   // IMath
   STDMETHOD(Add( long, long, long* ));
   STDMETHOD(Subtract( long, long, long* ));
   STDMETHOD(Multiply( long, long, long* ));
   STDMETHOD(Divide( long, long, long* ));

};

class MathClassFactory : public IClassFactory
{
protected:
   DWORD           m_dwRef;

public:
   MathClassFactory();
   ~MathClassFactory();

   // IUnknown
   STDMETHOD( QueryInterface(REFIID, void** ));
   STDMETHOD_(ULONG, AddRef());
   STDMETHOD_(ULONG, Release());

   // IClassFactory
   STDMETHOD( CreateInstance(LPUNKNOWN, REFIID, void**));
   STDMETHOD( LockServer(BOOL));
};