Function CheckDuplicateValues

gcore/gdalalgorithm.cpp:952–993

template <class T>
static bool CheckDuplicateValues(const GDALAlgorithmArg *arg,
                                 const std::vector<T> &values)
{
    auto tmpValues = values;
    bool bHasDupValues = false;
    if constexpr (std::is_floating_point_v<T>)
    {
        // Avoid undefined behavior with NaN values
        std::sort(tmpValues.begin(), tmpValues.end(),
                  [](T a, T b)
                  {
                      if (std::isnan(a) && !std::isnan(b))
                          return true;
                      if (std::isnan(b))
                          return false;
                      return a < b;
                  });

        bHasDupValues =
            std::adjacent_find(tmpValues.begin(), tmpValues.end(),
                               [](T a, T b)
                               {
                                   if (std::isnan(a) && std::isnan(b))
                                       return true;
                                   return a == b;
                               }) != tmpValues.end();
    }
    else
    {
        std::sort(tmpValues.begin(), tmpValues.end());
        bHasDupValues = std::adjacent_find(tmpValues.begin(),
                                           tmpValues.end()) != tmpValues.end();
    }
    if (bHasDupValues)
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "'%s' must be a list of unique values.",
                 arg->GetName().c_str());
        return false;
    }
    return true;
}

/************************************************************************/
/*               GDALAlgorithmArg::RunValidationActions()               */