OpenMp with custom reduction for GMP addition

问题

I have

mpf_t omp_mpf_add(mpf_t out, mpf_t in) {
  mpf_add(out, out, in);
  return out;
}

And i want to make this function as an openmp reduction

# pragma omp declare reduction (mpf_add:mpf_t:omp_mpf_add(omp_out,omp_in)) \
    initializer(omp_priv=omp_orig)

But i get error: reduction type cannot be an array type error.

what should i change so that the function will work and i can use it with

#pragma omp parallel for reduction(mpf_add:x)

来源：https://stackoverflow.com/questions/47617628/openmp-with-custom-reduction-for-gmp-addition