[Rd] switch to reference counting in R-devel

[Avraham Adler]

Agreed. Now is as good a time as any to send many,  many thanks are due to
Luke, Martin, Uwe, Duncan, the redoubtable  Professor B. and the entire
R-Core team for their seemingly countless hours of toil keeping R not only
afloat but healthy and vibrant. Your work is deeply appreciated, even if it
isn’t expressed often enough.

Thank you again!

Avi

On Tue, Dec 3, 2019 at 1:11 PM Henrik Bengtsson <henrik.bengtsson using gmail.com>
wrote:

> This is very exciting news.  Luke, thank you for all your work on this
> - I know it's been a long journey.
>
> All the best,
>
> Henrik
>
> On Tue, Dec 3, 2019 at 8:04 AM Tierney, Luke <luke-tierney using uiowa.edu>
> wrote:
> >
> > R-devel has been switched to use reference counting by default with
> > r77508. Building with -DSWITCH_TO_NAMED goes back to the NAMED
> > mechanism.
> >
> > Best,
> >
> > luke
> >
> > On Sun, 24 Nov 2019, luke-tierney using uiowa.edu wrote:
> >
> > > Baring any unforeseen issues R-devel will switch in about a week from
> > > the NAMED mechanism to reference counting for determining when objects
> > > can be safely mutated in base C code. This is expected to have minimal
> > > impact on packages not using unsupported coding practices in their C
> > > code.
> > >
> > >
> > > The transition to reference counting has been in progress for a
> > > number of years. Some older notes on this are available at
> > > http://developer.r-project.org/Refcnt.html.  These may no longer be
> > > completely accurate but should give you an idea of what is going on.
> > >
> > > If you want to test your package under reference counting you can do
> > > so by building R with -DSWITCH_TO_REFCNT added to CFLAGS or DEFS in a
> > > config.site file.
> > >
> > > A small number of packages are still using the NAMED or SET_NAMED
> > > functions even though this has been discouraged for some  time.
> > > For now these will not produce errors but also not do anything useful.
> > > They will probably be removed before R 4.0.0 is released, so you
> > > should look at why you are using them and adjust accordingly.
> > >
> > > Best,
> > >
> > > luke
> > >
> > >
> > >
> >
> > --
> > Luke Tierney
> > Ralph E. Wareham Professor of Mathematical Sciences
> > University of Iowa                  Phone:             319-335-3386
> > Department of Statistics and        Fax:               319-335-3017
> >     Actuarial Science
> > 241 Schaeffer Hall                  email:   luke-tierney using uiowa.edu
> > Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu
> >
> > ______________________________________________
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>
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