Function join

cpp/src/arrow/json/chunker_test.cc:46–59

template <typename Lines>
static std::shared_ptr<Buffer> join(Lines&& lines, std::string delimiter,
                                    bool delimiter_at_end = true) {
  std::shared_ptr<Buffer> joined;
  BufferVector line_buffers;
  auto delimiter_buffer = std::make_shared<Buffer>(delimiter);
  for (const auto& line : lines) {
    line_buffers.push_back(std::make_shared<Buffer>(line));
    line_buffers.push_back(delimiter_buffer);
  }
  if (!delimiter_at_end) {
    line_buffers.pop_back();
  }
  return *ConcatenateBuffers(line_buffers);
}

static bool WhitespaceOnly(string_view s) {
  return s.find_first_not_of(" \t\r\n") == string_view::npos;