'Returns true if there is a current IOLoop.
.. versionchanged:: 5.0
Redefined in terms of `current()` instead of `instance()`.
.. deprecated:: 5.0
This method only knows about `IOLoop` objects (and not, for
example, `asyncio` event loops), so it is of limited use.'

@staticmethod
def initialized():

    return (IOLoop.current(instance=False) is not None)
