string req_sketch::to_string()

in req/include/req_sketch_impl.hpp [631:675]

• 41 lines of code
• 11 McCabe index (conditional complexity)

string<A> req_sketch<T, C, A>::to_string(bool print_levels, bool print_items) const {
  // Using a temporary stream for implementation here does not comply with AllocatorAwareContainer requirements.
  // The stream does not support passing an allocator instance, and alternatives are complicated.
  std::ostringstream os;
  os << "### REQ sketch summary:" << std::endl;
  os << "   K              : " << k_ << std::endl;
  os << "   High Rank Acc  : " << (hra_ ? "true" : "false") << std::endl;
  os << "   Empty          : " << (is_empty() ? "true" : "false") << std::endl;
  os << "   Estimation mode: " << (is_estimation_mode() ? "true" : "false") << std::endl;
  os << "   Sorted         : " << (compactors_[0].is_sorted() ? "true" : "false") << std::endl;
  os << "   N              : " << n_ << std::endl;
  os << "   Levels         : " << compactors_.size() << std::endl;
  os << "   Retained items : " << num_retained_ << std::endl;
  os << "   Capacity items : " << max_nom_size_ << std::endl;
  if (!is_empty()) {
    os << "   Min item      : " << *min_item_ << std::endl;
    os << "   Max item      : " << *max_item_ << std::endl;
  }
  os << "### End sketch summary" << std::endl;

  if (print_levels) {
    os << "### REQ sketch levels:" << std::endl;
    os << "   index: nominal capacity, actual size" << std::endl;
    for (uint8_t i = 0; i < compactors_.size(); i++) {
      os << "   " << (unsigned int) i << ": "
        << compactors_[i].get_nom_capacity() << ", "
        << compactors_[i].get_num_items() << std::endl;
    }
    os << "### End sketch levels" << std::endl;
  }

  if (print_items) {
    os << "### REQ sketch data:" << std::endl;
    unsigned level = 0;
    for (const auto& compactor: compactors_) {
      os << " level " << level << ": " << std::endl;
      for (auto it = compactor.begin(); it != compactor.end(); ++it) {
        os << "   " << *it << std::endl;
      }
      ++level;
    }
    os << "### End sketch data" << std::endl;
  }
  return string<A>(os.str().c_str(), allocator_);
}