[Python-Dev] Inplace operations for PyLong objects
jelle.zijlstra at gmail.com
Fri Sep 1 16:19:39 EDT 2017
2017-09-01 13:05 GMT-07:00 Chris Barker <chris.barker at noaa.gov>:
> On Thu, Aug 31, 2017 at 5:12 PM, Antoine Pitrou <solipsis at pitrou.net>
>> I'm skeptical there are some programs out there that are limited by the
>> speed of PyLong inplace additions.
> indeed, but that could be said about any number of operations.
> My question is -- how can the interpreter know if it can alter what is
> supposed to be an immutable in-place? If it's used only internally to a
> function, the it would be safe, but how to know that?
I believe Catalin's implementation checks if the object's refcount is 1. If
that is the case, it is safe to mutate it.
> Christopher Barker, Ph.D.
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