Function mean

src/api/cpp/mean.cpp:24–28

namespace af {

array mean(const array& in, const dim_t dim) {
    af_array temp = 0;
    AF_THROW(af_mean(&temp, in.get(), getFNSD(dim, in.dims())));
    return array(temp);
}

array mean(const array& in, const array& weights, const dim_t dim) {
    af_array temp = 0;