/*
    Average of Array
    The average is defined as the sum of each value divided by count.
    */
    template< class T >
    FORCEINLINE auto Avg(const TArray<T>& Values) -> decltype(T() / double())
    {
        decltype(T() / double()) sum;
        if (ensure(Values.Num() > 0))
        {
            auto iter = begin(Values);
            double num = Values.Num();

            //initialize the result as the partial result from first element because the element type could be uninitialized, e.g. FVector
            sum = *iter / num;
            ++iter;
            do
            {
                sum += *iter / num;
                ++iter;
            } while (iter != end(Values));
        }
        else
        {
            sum = T() / 1.0;    //fall back to whatever default value, exception handled in ensure
        }
        return sum;
    }