[R-pkg-devel] Including Rcpp in an existing package

All,
My package was not initially built with the rcpp use in mind.  I have to include C++ source code for a particular project so I will have edit the description file add src files, etc.  by hand.  I an going over the rcpp documentation now and reviewing the R documentation on extensions as well.  Is there anything in particular that I should keep in mind while doing this or is this relatively straightforward.

It should be pretty straightforward.  There are lots of examples of 
packages that do it (not all of which are simple); see the list of 
"reverse XXXX" on https://CRAN.R-project.org/package=Rcpp (where XXXX is 
Depends, Imports, Suggests, or LinkingTo).

Duncan Murdoch

A mistake that I have made repeatedly is forgetting to add an
appropriate UseDynLib() call to the NAMESPACE file.

On 22/12/2016 1:55 PM, Glenn Schultz wrote:

All,
My package was not initially built with the rcpp use in mind.  I have
to include C++ source code for a particular project so I will have
edit the description file add src files, etc.  by hand.  I an going
over the rcpp documentation now and reviewing the R documentation on
extensions as well.  Is there anything in particular that I should
keep in mind while doing this or is this relatively straightforward.

It should be pretty straightforward.  There are lots of examples of
packages that do it (not all of which are simple); see the list of
"reverse XXXX" on https://CRAN.R-project.org/package=Rcpp (where XXXX is
Depends, Imports, Suggests, or LinkingTo).

Duncan Murdoch

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| > All,
| > My package was not initially built with the rcpp use in mind.  I have to include C++ source code for a particular project so I will have edit the description file add src files, etc.  by hand.  I an going over the rcpp documentation now and reviewing the R documentation on extensions as well.  Is there anything in particular that I should keep in mind while doing this or is this relatively straightforward.
| 
| It should be pretty straightforward.  There are lots of examples of 
| packages that do it (not all of which are simple); see the list of 
| "reverse XXXX" on https://CRAN.R-project.org/package=Rcpp (where XXXX is 
| Depends, Imports, Suggests, or LinkingTo).

Exactly. I also (still) hand-edit a chronological list at

    http://dirk.eddelbuettel.com/code/rcpp.cranusers.html

which contains a mix of 'fresh packages' (starting from scratch with Rcpp)
and 'converted packages' (which is what you are after). Sadly the latter set
is not indexed, so you have 'know' when a packages was pre-existing when it
made the list.

| 
|  A mistake that I have made repeatedly is forgetting to add an
| appropriate UseDynLib() call to the NAMESPACE file.

Exactly, as well (though really an issue about going from no src/ to having
src).

For the issue here I recommend creating two _minimal_ packages via, say,

    setwd("/tmp")                          # alter as neded
    package.skeleton("fooR")
    Rcpp.package.skeleton("fooRcpp")

and the study where/how they differ.  And maybe try to convert fooR into
fooRwithRcpp.

There is a dedicated list for Rcpp questions too.

Dirk

http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org