Method Visit

cpp/src/arrow/tensor.cc:234–263

  template <typename T>
  Status Visit(const T&) {
    if constexpr (is_numeric(T::type_id)) {
      using In = typename T::c_type;
      auto in_values = ArraySpan(in_data).GetSpan<In>(1, in_data.length);

      if (in_data.null_count == 0) {
        if constexpr (std::is_same_v<In, Out>) {
          memcpy(out_values, in_values.data(), in_values.size_bytes());
          out_values += in_values.size();
        } else {
          for (In in_value : in_values) {
            *out_values++ = static_cast<Out>(in_value);
          }
        }
      } else {
        for (int64_t i = 0; i < in_data.length; ++i) {
          if constexpr (T::type_id == Type::HALF_FLOAT && std::is_same_v<Out, uint16_t>) {
            *out_values++ = in_data.IsNull(i)
                                ? std::numeric_limits<util::Float16>::quiet_NaN().bits()
                                : static_cast<Out>(in_values[i]);
          } else {
            *out_values++ = in_data.IsNull(i) ? static_cast<Out>(NAN)
                                              : static_cast<Out>(in_values[i]);
          }
        }
      }
      return Status::OK();
    }
    Unreachable();
  }
};

template <typename Out>