> You happened to send a link which points to the OP's own package :) I > think Jiefei would like to know how one can "officially" determine if an > arbitrary ALTERP object belongs to a class that he owns. Argh, I am sorry! I did not notice that. My best bet for what I thought the question was is section 1.1.2 of R Internals where they note that: `unsigned int alt : 1; /* is this an ALTREP object? */`
This is also what the ALTREP macro checks. However, I also did not notice the "... if an ALTREP object is from my package" part. I am sorry. Sincerely Yours, Benjamin Den man. 19. okt. 2020 kl. 11.25 skrev Dénes Tóth <toth.de...@kogentum.hu>: > > Benjamin, > > You happened to send a link which points to the OP's own package :) I > think Jiefei would like to know how one can "officially" determine if an > arbitrary ALTERP object belongs to a class that he owns. > > Regards, > Denes > > > On 10/19/20 10:22 AM, Benjamin Christoffersen wrote: > > It seems as if you can you use the ALTREP macro as done in this > > package: > > https://github.com/Jiefei-Wang/SharedObject/blob/804b6ac58c63a4bae95343ab43e8b1547b07ee6b/src/C_interface.cpp#L185 > > > > and in base R: > > https://github.com/wch/r-source/blob/54fbdca9d3fc63437d9e697f442d32732fb4f443/src/include/Rinlinedfuns.h#L118 > > > > The macro is defined here in Rinternals.h: > > https://github.com/wch/r-source/blob/abb550c99b3927e5fc03d12f1a8e7593fddc04d2/src/include/Rinternals.h#L325 > > > > Den man. 19. okt. 2020 kl. 10.13 skrev Jiefei Wang <szwj...@gmail.com>: > >> > >> Hi all, > >> > >> I would like to determine if an ALTREP object is from my package, I see > >> there is a function `ALTREP_CLASS` defined in RInternal.h but its return > >> value is neither a `R_altrep_class_t` object nor an STRSXP representing a > >> class name. I do not know how to correctly use it. Any suggestions? > >> > >> Thanks, > >> Jiefei > >> > >> [[alternative HTML version deleted]] > >> > >> ______________________________________________ > >> R-devel@r-project.org mailing list > >> https://stat.ethz.ch/mailman/listinfo/r-devel > > > > ______________________________________________ > > R-devel@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
