[Rd] help with rchk warnings on Rf_eval(Rf_lang2(...))

[Romain Francois]

> Le 23 mars 2020 à 22:55, Dirk Eddelbuettel <edd using debian.org> a écrit :
> 
> On 23 March 2020 at 17:07, Ben Bolker wrote:
> | Or is there a way I can use Shield() since this an Rcpp-based project
> | anyway?
> 
> Yes you can, and I would recommend it.
> 
> Example from Rcpp itself, file Environment.h:
> 
>  Shield<SEXP> res(Rcpp_fast_eval(Rf_lang2(asEnvironmentSym, x), R_GlobalEnv));

This is not safe. The call made by Rf_lang2() needs to be protected here. 

> For Rcpp_fast_eval, you may still need to #define RCPP_USE_UNWIND_PROTECT
> before including Rcpp.h; as I recall we were seeing too many side effects in
> other packages when globally enabling it.  Or you can play it safe and simply
> use Rcpp_eval.
> 
> This really was more of a rcpp-devel question.
> 
> Dirk
> 
> -- 
> http://dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org
> 
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