Function Set2String

src/pstd/src/pstd_string.cc:612–622

}

std::string Set2String(const std::unordered_set<std::string>& elems, char delim) {
  std::string value;
  for (const auto &e : elems) {
    value.append(e);
    value.append(1, delim);
  }
  if (!value.empty()) {
    value.resize(value.size() - 1);
  }
  return value;
}

std::string StringConcat(const std::vector<std::string>& elems, char delim) {
  std::string result;