[Python-Dev] Removing tp_compare? (original) (raw)

Guido van Rossum guido at python.org
Sun Feb 1 17:21:07 CET 2009

On Sun, Feb 1, 2009 at 4:22 AM, Mark Dickinson <dickinsm at gmail.com> wrote:

On Sat, Jan 31, 2009 at 9:28 PM, "Martin v. Löwis" <martin at v.loewis.de> wrote:

tpreserved sounds fine. In 3.0.1, filling it with a function pointer should give no error, since that would be a binary-incompatible change. I'm not sure I understand you here. Are you saying that in your opinion it is safe to change the type of tpreserved from (cmpfunc *) to some other (dummy) function pointer?

Sounds like Martin is referring to your suggestion to raise an exception when initializing a type that has a non-NULL thing here. I agree with him.

I now realize (thanks to your message) that changing the type to (void ) isn't entirely safe, since sizeof(void) may be different from sizeof(cmpfunc*) on some platforms.

I don't think it matters on any platforms we care about.

-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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