Another useful technique for handling errors is to throw an exception of type CXlErrorException. This has the same effect as setting xloResult to an error value, and allows more natural C++ program flow.

For the previous example, throwing an exception would result in code like this:

CXlOper* NORMSINV2_Impl(CXlOper& xloResult, double Probability)
{
    CXlOper xloResult;
//}}XLP_SRC 
 
    double Z;                                
    if (!InverseCumNormal(Probability, &Z))  
        throw CXlErrorException(xlerrNum);   
    xloResult = Z;                           
    return xloResult.Ret();
}

Particularly when there are many possible avenues to failure, this approach leads to more transparent and reliable code.

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