Hi Dirk and Sokol, thanks for the responses. Dirk I was aware that the C/C++ output type of wrap is always SEXP, but I my question was about the R type/class. Also thanks for the ref of the discussion in Sec 3.1 of the JSS 2011 article, which is pretty much what I was looking for, but it seems to be incomplete. I can deduce from the example that std::vector becomes a list in R, and std::map<string, int> becomes a named integer vector in R, but I am looking for a list of all such conversions that have currently been implemented. I guess there is no such documentation, and we should instead refer to the source code as Seugeui pointed out? In that case I find it a bit problematic, because there are lots of conversions that are possible, but not obvious upon inspection of wrap.h. For example the std::vector -> R list conversion is not obvious (I don't see any mention of std::vector in wrap.h actually). As an Rcpp user I think it would be very helpful to have a list/table that documents all the currently implemented conversions. Would that be very difficult to write by hand / generate from the source code?
On Sun, Apr 26, 2020 at 12:07 AM Sokol Serguei <so...@insa-toulouse.fr> wrote: > Le 26/04/2020 à 01:19, Dirk Eddelbuettel a écrit : > > On 25 April 2020 at 16:04, Toby Hocking wrote: | Hi, can someone > > please tell me where the return types of wrap are | documented? The > > _return_ value of a wrap() call is by definition always SEXP. Just how > > the _input_ for as<>() converters is always a SEXP. For wrap(), see > > e.g. Section 3.1 of the JSS 2011 paper which ships as vignette > > Rcpp-jss-2011.pdf > To complete the Dirk's response, this gallery example can be of some help: > > https://gallery.rcpp.org/articles/custom-templated-wrap-and-as-for-seamingless-interfaces/ > > And as always, an ultimate place to clarify the trickiest questions is > the code itself ;) : > > https://github.com/sgsokol/Rcpp/blob/master/inst/include/Rcpp/internal/wrap.h > > Best, > Serguei. >
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