Method DoPeek

cpp/src/arrow/io/memory.cc:287–293

}

Result<std::string_view> BufferReader::DoPeek(int64_t nbytes) {
  RETURN_NOT_OK(CheckClosed());

  const int64_t bytes_available = std::min(nbytes, size_ - position_);
  return std::string_view(reinterpret_cast<const char*>(data_) + position_,
                          static_cast<size_t>(bytes_available));
}

bool BufferReader::supports_zero_copy() const { return true; }