New submission from Petr Viktorin <encu...@gmail.com>:

For cases where you aren't adding new C-level state, especially if don't have 
the superclass' struct available, it would be good to allow inheriting 
basicsize/itemsize from the superclass.

(SuperType->tp_size is not easily usable for the same reason 
PyType_FromSpecWithBases exists: on MSVC, if SuperType comes from a different 
DLL, it is not a constant expression.)

----------
messages: 404311
nosy: petr.viktorin
priority: normal
severity: normal
status: open
title: PyType_Spec basicsize/itemsize should allow -1 for "inherit"

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45525>
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