Question about garbage collection
Frank Millman
frank at chagford.com
Wed Jan 17 01:42:17 EST 2024
On 2024-01-17 3:01 AM, Greg Ewing via Python-list wrote:
> On 17/01/24 1:01 am, Frank Millman wrote:
>> I sometimes need to keep a reference from a transient object to a more
>> permanent structure in my app. To save myself the extra step of
>> removing all these references when the transient object is deleted, I
>> make them weak references.
>
> I don't see how weak references help here at all. If the transient
> object goes away, all references from it to the permanent objects also
> go away.
>
> A weak reference would only be of use if the reference went the other
> way, i.e. from the permanent object to the transient object.
>
You are right. I got my description above back-to-front. It is a pub/sub
scenario. A transient object makes a request to the permanent object to
be notified of any changes. The permanent object stores a reference to
the transient object and executes a callback on each change. When the
transient object goes away, the reference must be removed.
Frank
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