[R-pkg-devel] [External] Rf_lazy_duplicate moved to nonAPI

[Iris Simmons]

> That is not quite right. Rf_lazy_duplicate was never in the API.

I wish you wouldn't be contrarian just for the sake of it, and I wish
you'd at least be correct when you are. I never said Rf_lazy_duplicate
was part of the API. I said it was placed on the list of non-API C
functions, which is true.
https://github.com/wch/r-source/commit/42b67e1c9bd29506d5e1de8c50389cb4ad39f74a#diff-85fcd7ad89c2b2a608f20c34b99001203b2bc8d2f41c5aedef8239a4e4e98590R697

> Using it in a package has been producing a NOTE in R CMD check for a while; that NOTE has now been upgraded to a WARNING.

3 weeks is not a while.

> It has been essentially a no-op since the change to reference counting several years ago. So Rf_lazy_duplicate(x) is now essentially the same as x.

Thanks.

On Wed, Nov 5, 2025 at 10:37 PM <luke-tierney using uiowa.edu> wrote:
>
> On Thu, 6 Nov 2025, Iris Simmons wrote:
>
> > Hi,
> >
> >
> > I see Rf_lazy_duplicate was placed on the list of non-API C functions.
>
> That is not quite right. Rf_lazy_duplicate was never in the API. Using
> it in a package has been producing a NOTE in R CMD check for a while;
> that NOTE has now been upgraded to a WARNING.
>
> > Is there going to be a replacement, or some alternative? None is
> > mentioned in Writing R Extensions.
>
> It has been essentially a no-op since the change to reference counting
> several years ago. So Rf_lazy_duplicate(x) is now essentially the same
> as x.
>
> Best,
>
> luke
>
> >
> >
> > Thanks,
> >    Iris
> >
> > ______________________________________________
> > R-package-devel using r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-package-devel
> >
>
> --
> Luke Tierney
> Ralph E. Wareham Professor of Mathematical Sciences
> University of Iowa                  Phone:             319-335-3386
> Department of Statistics and        Fax:               319-335-3017
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