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Compiler Error C3763

'type': 'retval' and 'out' can only appear on a data-pointer type

The out or retval attributes can only appear on parameters of type pointer. Either remove the attribute or make the parameter of type pointer.

The following sample generates C3763:

// C3763.cpp
#include <atlbase.h>
#include <atlplus.h>
#include <atlcom.h>

[ module(name=test) ];

[ dispinterface, uuid("00000000-0000-0000-0000-000000000001") ]
__interface IF84 : IDispatch
   [id(0x00000002)]HRESULT m2([out]unsigned char);

[ coclass, uuid("00000000-0000-0000-0000-000000000002") ]
class CF84 : public IF84
{   // C3763
   HRESULT __stdcall m2(unsigned char i)
      return S_OK;

int main()