[Rcpp-devel] Simplest Class Example For Starters

ivo welch ivo.welch at gmail.com
Fri May 31 00:08:26 CEST 2013

thx, dirk.  first, apologies for multiposting earlier.  I thought it did
not allow me to post from my non-registered email address.  second,
apologies for the private email.  I wasn't expecting any answers.  just
wanted to help with some feedback.  I will buy your Rcpp book when it comes

I think you are correct that modules are too tough for me.  heck, I don't
even write R packages.  I am just an end user.  I would have to learn how
to write and build those first.  so, I think I will want to go the accessor
function route.  can cppFunction() allow me to define structures?  I am
just trying something super-simple here:

library( Rcpp )
struct Silly {
  double *v; int k;
void hello(int i) { printf("hello, world\n"); }
cat("Compiled OK\n")

but it fails, both on the printf and on the structure definition.  I am
wondering whether cppFunction can just handle single functions and without
quotation marks.



Ivo Welch (ivo.welch at gmail.com)

On Thu, May 30, 2013 at 10:02 AM, Dirk Eddelbuettel <edd at debian.org> wrote:

> Ivo,
> Appreciate that you post here.  Am a little pressed for time but in a
> nutshell, you missed that the new (and very nice) Rcpp Attributes which you
> use for sourceCpp do NOT currently mix with Rcpp Modules.
> So either concentrate on easily writing accessor function, OR concentrate
> on
> using Modules (which is not th easiest topic to start with). You cannot mix
> and match.
> As for simplest examples: they are eg in the package itself, look at
>    /usr/local/lib/R/site-library/Rcpp/unitTests/testRcppModule/
> which provides a small but complete working package using modules.
> Hope this helps,  Dirk
> --
> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
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