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

[iuke-tier@ey m@iii@g oii uiow@@edu]

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
>
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-- 
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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