[Rcpp-devel] Locating an Instance of a Reference Class in the Environment

[Matthew Supernaw - NOAA Federal]

Thanks! Working offline would be great!

On Tue, Mar 28, 2023 at 11:34 AM Dirk Eddelbuettel <edd at debian.org> wrote:

>
> Hi Matthew,
>
> Thanks for circling back!
>
> On 28 March 2023 at 11:23, Matthew Supernaw - NOAA Federal wrote:
> | Hi Dirk,
> | Thanks for your attention on this. I was able to find a solution that
> works for
> | us.
> | Matthew
> |
> | https://github.com/NOAA-FIMS/ModularTMBExample/blob/map/src/
> | tmb_objective_function.cpp#L133
>
> Ok -- if you want we can maybe offline work on smoothing that over. You
> have
> Rcpp already at your disposal there, you should not need the darn PROTECT
> and
> UNPROTECT that makes my eyes burn.
>
> Total aside:  I needed a finger exercise for turning factor to character
> and
> vice verse and just did this (for now (?) in RcppExamples):
>
> https://github.com/eddelbuettel/rcppexamples/blob/master/src/makeFactor.cpp
>
> and looks like I forgot to rename the file which I may do to
> FactorExample.cpp
>
> Dirk
>
> | On Fri, Mar 24, 2023 at 4:36 PM Jeff Newmiller <jdnewmil at dcn.davis.ca.us
> >
> | wrote:
> |
> |     Well, feel free to ignore my post, but the gist was that anything
> you have
> |     access to in R can be passed by your R API code to your Rcpp code.
> Also,
> |     due to R's GC you should usually avoid caching references between
> calls to
> |     your Rcpp code anyway.
> |
> |     On March 24, 2023 12:40:43 PM PDT, Matthew Supernaw - NOAA Federal <
> |     matthew.supernaw at noaa.gov> wrote:
> |     >Hi Jeff,
> |     >I'm not sure I understand your comment. The code is part of a
> package.
> |     >We're just trying to sync the declared object name in the R
> environment to
> |     >the object in the Rcpp module programmatically from c++ for
> internal use.
> |     I
> |     >just wondered if there was a way to access the wrapped object in the
> |     >Rcpp:::PreserveStorage class and Dirk answered that question.
> |     >Thanks.
> |     >Matthew
> |     >
> |     >
> |     >On Fri, Mar 24, 2023 at 2:34 PM Jeff Newmiller <
> jdnewmil at dcn.davis.ca.us>
> |     >wrote:
> |     >
> |     >> Matthew... the normal context for sharing Rcpp code is within a
> package.
> |     >> It is a no-brainer to have an R API called by the user that calls
> |     whatever
> |     >> Rcpp code it needs to, which is why your objection seems
> inappropriate
> |     to
> |     >> me.
> |     >>
> |     >> On March 24, 2023 10:43:34 AM PDT, Dirk Eddelbuettel <
> edd at debian.org>
> |     >> wrote:
> |     >> >
> |     >> >On 24 March 2023 at 13:08, Matthew Supernaw - NOAA Federal wrote:
> |     >> >| I'm sure it's possible to do from the R side, however, the
> |     requirement
> |     >> is to
> |     >> >| hide this from the end user and set the reference objects name
> to the
> |     >> declared
> |     >> >| name from the R environment. If I view the environment in
> RStudio,
> |     >> there is
> |     >> >| much more information available. ls() only returns a list of
> objects
> |     by
> |     >> their
> |     >> >| declared name. I'm wondering how to get more details about
> elements
> |     in
> |     >> the
> |     >> >| environment.
> |     >> >
> |     >> >Thanks for additional color.  That may be a very interesting and
> |     valuable
> |     >> >question _for the C API of R_ and youe guess of "maybe Rcpp has a
> |     helper"
> |     >> is
> |     >> >a good one.  Sadly, I fear we may not have anything for you.
> |     >> >
> |     >> >Dirk
> |     >> >
> |     >> >--
> |     >> >dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
> |     >> >_______________________________________________
> |     >> >Rcpp-devel mailing list
> |     >> >Rcpp-devel at lists.r-forge.r-project.org
> |     >> >
> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
> |     >> --
> |     >> Sent from my phone. Please excuse my brevity.
> |     >>
> |     >
> |     >
> |
> |     --
> |     Sent from my phone. Please excuse my brevity.
> |
> |
> |
> | --
> | Matthew Supernaw
> | Scientific Software Developer
> | National Oceanic and Atmospheric Administration
> | Office Of Science and Technology
> | NOAA Fisheries | U.S. Department of Commerce
> | Phone 248 - 396 - 7797
> |
> |
>
> --
> dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>


-- 
Matthew Supernaw
*Scientific Software Developer*
*National Oceanic and Atmospheric Administration*
*Office Of Science and Technology*
*NOAA Fisheries | *U.S. Department of Commerce
Phone 248 - 396 - 7797
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