Returns a pointer to Excel's return value
static LPCXLOPER RetVal( );
This function returns a read-only pointer to some static memory containing a copy of the CXlOper data about to be returned to Excel.
The statement is only valid between a call to CXlOper::Ret() and the return from an add-in function. (Note that CXlOper::RetString() and CXlOper::RetError() both call CXlOper::Ret(), and therefore use the same buffer.)
Thus it is only safe to call it during the destructor of an object which is at function scope in an add-in function. It is used by the destructor of CXlCacheBinding to add new results to the cache.