[New-bugs-announce] [issue15870] PyType_FromSpec should take metaclass as an argument

[Alexander Belopolsky]

New submission from Alexander Belopolsky:

PyType_FromSpec() is a convenient function to create types dynamically in C extension modules, but its usefulness is limited by the fact that it creates new types using the default metaclass.

I suggest adding a new C API function

PyObject *PyType_FromSpecEx(PyObject *meta, PyType_Spec *spec)

and redefine PyType_FromSpec() as

PyType_FromSpecEx((PyObject *)&PyType_Type, spec)


This functionality cannot be implemented by user because PyType_FromSpec requires access to private slotoffsets table.

A (trivial) patch attached.

----------
assignee: belopolsky
components: Interpreter Core
files: typeobject.diff
keywords: needs review, patch
messages: 169925
nosy: belopolsky, loewis
priority: normal
severity: normal
stage: test needed
status: open
title: PyType_FromSpec should take metaclass as an argument
type: enhancement
versions: Python 3.4
Added file: http://bugs.python.org/file27137/typeobject.diff

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15870>
_______________________________________