Weak reference: Difference between revisions

Revision as of 16:23, 21 June 2017

Revision as of 12:11, 22 January 2018

Line 103:

public Node next;

}

</source>

===Python3===

<source lang=python3>

>>> import weakref

>>> import gc

>>> class Egg:

... def spam(self):

... print("I'm alive!")

...

>>> obj = Egg()

>>> weak_obj = weakref.ref(obj)

>>> weak_obj().spam()

I'm alive!

>>> obj = "Something else"

>>> gc.collect()

35

>>> weak_obj().spam()

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

AttributeError: 'NoneType' object has no attribute 'spam'

</source>