class_docstr: ``_WrappingCheckpointIO`` is a wrapper checkpoint_io that uses a base checkpoint_io to handle checkpointing.
  
  Args:
      checkpoint_io: A checkpoint IO plugin that is used as the basis.
class_docstr_tok: ["``","_WrappingCheckpointIO","``","is","a","wrapper","checkpoint_io","that","uses","a","base","checkpoint_io","to","handle","checkpointing",".","Args",":","checkpoint_io",":","A","checkpoint","IO","plugin","that","is","used","as","the","basis","."]
code: def checkpoint_io(self) -> Optional["CheckpointIO"]:
      return self._checkpoint_io
  
file_path: pytorch-lightning/src/lightning/pytorch/plugins/io/wrapper.py
imports: from typing import Any, Dict, Optional
  from typing_extensions import override
  from lightning.fabric.plugins import CheckpointIO
label_desc: Use image node_id 2 for calling the _WrappingCheckpointIO obj's underlying member method code with example usage: obj.checkpoint_io() and returns: self