Assigns a boolean value and data type to the CXlOper
[C++]
const CXlOper& FromBool(
   BOOL boolVal
);
Value to be applied to the CXlOper.
This function assigns the value of boolVal to the CXlOper, 
            and sets the type of the CXlOper to be xltypeBool.
Header: xllplus.h