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Karim Belabas on Sun, 27 Aug 2023 16:18:37 +0200
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Re: bug in simplify_shallow
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- To: "Ruud H.G. van Tol" <rvtol@isolution.nl>
- Subject: Re: bug in simplify_shallow
- From: Karim Belabas <Karim.Belabas@u-bordeaux.fr>
- Date: Sun, 27 Aug 2023 16:13:54 +0200
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* Ruud H.G. van Tol [2023-08-27 15:42]:
>
> On 2023-08-27 14:58, Bill Allombert wrote:
> > [...]to be honest I did not remember that listput returned x and it is
> > not explicitly documented
>
> ? ??listput
> listput( list,x,{n}):
>
> Sets the n-th element of the list list (which must be of type t_LIST)
> equal to x. If n is omitted, or greater than the list length, appends x. The
> function returns the inserted element.
>
> So "returns the inserted element".
What "the inserted element" means is ambiguous in the context of PARI's
memory model. What the implementation does is return a direct pointer to
the new list entry, that inserted element being a clone of the input x.
What Bill and I suggested was to return "a copy of the inserted element"
instead. I don't really see a scenario where this would break
compatibility ... except this would make insertion about twice slower,
even in cases where the returned value is ignored.
Cheers,
K.B.
--
Pr. Karim Belabas, U. Bordeaux, Vice-président en charge du Numérique
Institut de Mathématiques de Bordeaux UMR 5251 - (+33) 05 40 00 29 77
http://www.math.u-bordeaux.fr/~kbelabas/