Function join_strings

paddle/utils/string/string_helper.h:173–189

template <class Container>
std::string join_strings(const Container& strs, char delim) {
  std::string str;

  size_t i = 0;
  for (auto& elem : strs) {
    if (i > 0) {
      str += delim;
    }

    std::stringstream ss;
    ss << elem;
    str += ss.str();
    ++i;
  }

  return str;
}

template <class Container>
std::string join_strings(const Container& strs, const std::string& delim) {