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tp_new, tp_alloc, tp_init
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Michael Hennebry  
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 More options Nov 30 2011, 12:10 pm
Newsgroups: comp.lang.python
From: Michael Hennebry <egg1...@gmail.com>
Date: Wed, 30 Nov 2011 09:10:09 -0800 (PST)
Local: Wed, Nov 30 2011 12:10 pm
Subject: tp_new, tp_alloc, tp_init
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I've been reading about writing extension types in C and am rather
fuzzy about the relationship between tp_new, tp_alloc and tp_init.
Most especially, why tp_new? It seems to me that tp_alloc and tp_init
would be sufficient.

Most of my reading has been in the Noddy and Shoddy portions of
docs.python.,org .


 
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Gregory Ewing  
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 More options Dec 8 2011, 4:33 pm
Newsgroups: comp.lang.python
From: Gregory Ewing <greg.ew...@canterbury.ac.nz>
Date: Fri, 09 Dec 2011 10:33:10 +1300
Local: Thurs, Dec 8 2011 4:33 pm
Subject: Re: tp_new, tp_alloc, tp_init
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Michael Hennebry wrote:
> I've been reading about writing extension types in C and am rather
> fuzzy about the relationship between tp_new, tp_alloc and tp_init.
> Most especially, why tp_new? It seems to me that tp_alloc and tp_init
> would be sufficient.

tp_new and tp_init correspond to the Python methods
__new__ and __init__, and they're separated for the
same reasons they are in Python.

tp_alloc is separate because it allows a type to
use a custom memory allocator without disturbing the
rest of the initialisation mechanism.

--
Greg


 
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