Function cmJoinStrings

Source/cmStringAlgorithms.h:89–115

 */
template <typename Range>
std::string cmJoinStrings(Range const& rng, cm::string_view separator,
                          cm::string_view initial)
{
  if (rng.empty()) {
    return { std::begin(initial), std::end(initial) };
  }

  std::string result;
  result.reserve(std::accumulate(
    std::begin(rng), std::end(rng),
    initial.size() + (rng.size() - 1) * separator.size(),
    [](std::size_t sum, typename Range::value_type const& item) {
      return sum + item.size();
    }));
  result.append(std::begin(initial), std::end(initial));

  auto begin = std::begin(rng);
  auto end = std::end(rng);
  result += *begin;

  for (++begin; begin != end; ++begin) {
    result.append(std::begin(separator), std::end(separator));
    result += *begin;
  }

  return result;
}

/**
 * Faster overloads for std::string ranges.