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

[Jeff Newmiller]

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
>> >_______________________________________________
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>> >Rcpp-devel at lists.r-forge.r-project.org
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>> --
>> Sent from my phone. Please excuse my brevity.
>>
>
>

-- 
Sent from my phone. Please excuse my brevity.