[C++-sig] Ownership question.

[tALSit de CoD]

Ok, I think i got ya, but I think that's not what I was saying.

When I do this:

 >>> key = cAnimCurveKey ()

Python is in charge of the ownership of the object. So, in theory, the GC 
could mark it for collection at any given moment, right?

So if I now add the key to a class that takes it's ownership, what happens?

 >>> animCurve.addKey (key)  # animCurve is now in charge of deleting the key

is key still managed by python? Will it be marked for collection by the GC? 
If so, how do i prevent it?

At 04:00 27/04/2003 -0300, you wrote:
>tALSit de CoD wrote:
>
>>I have a class method that takes ownership of the object passed into it, 
>>and I want to know, how do I let boost.python know about this and not to 
>>manage that object anymore?

[SNIP SNIP]

>>OOOOORRRRRR Is there a way to specify to boost.python that you don't want 
>>it to manage or track that object anymore?
>>
>>Thanks folks
>>Cheers!
>
>
>Unfortunately, I don't think you will get a "nice" way to acomplish this, 
>because of how garbage collection works in Python. Consider:
>
> >>> def foo(s):
>...    # use s
>...    del s  # useless, but just to illustrate the point
>...
> >>> x = [1, 2, 3]
> >>> foo(x)
> >>> x
>[1, 2, 3]
>
>So, there's simply no way for a Python function to delete a variable 
>passed as parameter... actually, you can't delete any variable and be sure 
>that it was actually release, because there could still be references to 
>it somewhere else. In python, there's no ownership (you can have 
>references with no ownership - weak references), just references to an 
>object, that will be disposed when no more references exist.
>
>
>Regards,
>Nicodemus.
>
>>
>>
>>   tALSit de CoD  |  talsit.org
>>
>>
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   tALSit de CoD  |  talsit.org