Method Read

cpp/src/arrow/io/file.cc:696–701

}

Result<int64_t> MemoryMappedFile::Read(int64_t nbytes, void* out) {
  RETURN_NOT_OK(memory_map_->CheckClosed());
  ARROW_ASSIGN_OR_RAISE(int64_t bytes_read, ReadAt(memory_map_->position(), nbytes, out));
  memory_map_->advance(bytes_read);
  return bytes_read;
}

Result<std::shared_ptr<Buffer>> MemoryMappedFile::Read(int64_t nbytes) {
  RETURN_NOT_OK(memory_map_->CheckClosed());