How to define multiple operations in OpenMP reduction?

Question

C++ / C#

Is there any way to shorten this code?

double tmp = 0;
#pragma omp parallel
    {
#pragma omp for reduction(+:tmp)
        for (int i = 0; i < N; ++i) {
            tmp += i * i;
        }

#pragma omp single
        {
            tmp = sqrt(tmp);
        }
    } //end #pragma omp parallel

That is, is it possible to somehow set in reduction several operations / functions that need to be performed on the variable at the end?