[Patches] [ python-Patches-1501180 ] Cyclic garbage collection support for slices

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Patches item #1501180, was opened at 2006-06-05 21:15
Message generated for change (Settings changed) made by zseil
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Category: Core (C code)
Group: Python 2.5
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Submitted By: Žiga Seilnacht (zseil)
Assigned to: Nobody/Anonymous (nobody)
Summary: Cyclic garbage collection support for slices

Initial Comment:
Slice's members start, stop and step can
be arbitrary python objects, which means
that slices can be easily included in
reference cycles (see the test in the
patch).
The patch includes the necessary changes
to enable support for the gc. Since slices
are immutable, there should be no need for
a tp_clear method.
I also changed the slice_dealloc function
to use Py_CLEAR macros instead of Py_DECREF.

I noticed that PySlice_GetIndices is still
missing support for types with a __index__
method. I don't know if that is intentional
or not.

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>Comment By: Žiga Seilnacht (zseil)
Date: 2006-06-05 23:36

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OK, closing it.

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Comment By: Tim Peters (tim_one)
Date: 2006-06-05 23:27

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No offense, but thrust of this seems goofy.  Slice objects
aren't sanely used as containers for arbitrary objects, they
typically hold only integers and maybe None.  The decision
to leave them out of cyclic gc was therefore sensible; that
they can be abused in strained ways to create cycles seems
much more an exercise in determined perverseness than a
practical concern.

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Comment By: Žiga Seilnacht (zseil)
Date: 2006-06-05 23:12

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Updated a misleading comment.

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