Message 402520 - Python tracker

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In-reply-to
Author	haberman2
Recipients	Alexander.Belopolsky, Arfrever, Christian.Tismer, Robin.Schreiber, amaury.forgeotdarc, belopolsky, haberman2, jcea, jhaberman, lekma, loewis, mattip, petr.viktorin, pitrou, seberg, steve.dower
Date	2021年09月23日.18:53:55
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1632423235.85.0.87090505493.issue15870@roundup.psfhosted.org>

Content
> Passing the metaclass as a slot seems like the right idea for this API, though I recall there being some concern about the API (IIRC, mixing function pointers and data pointers doesn't work on some platforms?) PyType_Slot is defined as a void* (not a function pointer): https://github.com/python/cpython/blob/8492b729ae97737d22544f2102559b2b8dd03a03/Include/object.h#L223-L226 So putting a PyTypeObject* into a slot would appear to be more kosher than function pointers. Overall, a slot seems like a great first approach. It doesn't require any new functions, which seems like a plus. If the any linking issues a la tp_base are seen, a new function could be added later.

Content

> Passing the metaclass as a slot seems like the right idea for this API, though I recall there being some concern about the API (IIRC, mixing function pointers and data pointers doesn't work on some platforms?)
PyType_Slot is defined as a void* (not a function pointer): https://github.com/python/cpython/blob/8492b729ae97737d22544f2102559b2b8dd03a03/Include/object.h#L223-L226
So putting a PyTypeObject* into a slot would appear to be more kosher than function pointers.
Overall, a slot seems like a great first approach. It doesn't require any new functions, which seems like a plus. If the any linking issues a la tp_base are seen, a new function could be added later.

History
Date	User	Action	Args
2021年09月23日 18:53:55	haberman2	set	recipients: + haberman2, loewis, jcea, amaury.forgeotdarc, belopolsky, pitrou, Arfrever, petr.viktorin, lekma, Alexander.Belopolsky, mattip, Robin.Schreiber, steve.dower, seberg, Christian.Tismer, jhaberman
2021年09月23日 18:53:55	haberman2	set	messageid: <1632423235.85.0.87090505493.issue15870@roundup.psfhosted.org>
2021年09月23日 18:53:55	haberman2	link	issue15870 messages
2021年09月23日 18:53:55	haberman2	create

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