Method CopySubset

src/io/dense_bin.hpp:303–308

  }

  void CopySubset(const Bin* full_bin, const data_size_t* used_indices, data_size_t num_used_indices) override {
    auto other_bin = dynamic_cast<const DenseBin<VAL_T>*>(full_bin);
    for (int i = 0; i < num_used_indices; ++i) {
      data_[i] = other_bin->data_[used_indices[i]];
    }
  }

  void SaveBinaryToFile(const VirtualFileWriter* writer) const override {
    writer->Write(data_.data(), sizeof(VAL_T) * num_data_);