On Sat, 2 Sep 2017, Radford Neal wrote:
To allow for future changes in the way the need for duplication is
detected in R internal C code, package C code should avoid direct
use of NAMED,and SET_NAMED, or assumptions on the maximal value
of NAMED. Use the macros MAYBE_REFERENCED, MAYBE_SHARED, and
MARK_NOT_MUTABLE instead. These currently correspond to
MAYBE_REFERENCED(x): NAMED(x) > 0
MAYBE_SHARED(x): NAMED(x) > 1
MARK_NOT_MUTABLE(x): SET_NAMED(c, NAMEDMAX)
Best,
luke
Checking https://cran.r-project.org/doc/manuals/r-release/R-exts.html
shows that currently there is no mention of these macros in the
documentation for package writers. Of course, the explanation of
NAMED there also does not adequtely describe what it is supposed to
mean, which may explain why it's often not used correctly.
As of yesterday they are mentioned in the R-devel version of this
manual, which will make it to the web in due course.
Before embarking on a major change to the C API, I'd suggest that you
produce clear and complete documention on the new scheme.
Radford Neal
--
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-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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