[Rcpp-devel] Simplest Class Example For Starters

[Dirk Eddelbuettel]

On 30 May 2013 at 15:08, ivo welch wrote:
| 
| 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 out.
| 
| 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 )
|     cppFunction('
|     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.

You really should consider reading the excellent vignette 'Rcpp attributes'. 

Dirk

| 
| regards,
| 
| /iaw
| 
| ----
| 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
| 
| 

-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com