Function create

src/common/perf_counters_key.cc:76–98

}

std::string create(std::string_view counter_name,
                   label_pair* begin, label_pair* end)
{
  // sort the input labels and remove duplicate keys
  std::sort(begin, end, label_key_less);
  end = std::unique(begin, end, label_key_equal);

  // calculate the total size and preallocate the buffer
  auto size = std::accumulate(begin, end,
                              counter_name.size() + sizeof(DELIMITER),
                              [] (std::size_t sum, const label_pair& l) {
                                return sum + label_size(l);
                              });
  std::string result;
  result.resize(size);

  // copy out the counter name and labels
  auto out = result.begin();
  out = write(counter_name, out);
  std::copy(begin, end, label_insert_iterator{out});

  return result;
}

std::string insert(const char* begin1, const char* end1,
                   label_pair* begin2, label_pair* end2)