[Rcpp-devel] help packaging Rcpp modules

[James Simone]

Hi Dirk,

Thank You for the quick reply.


After reading many posts, I found your suggestion works:

 > R.version.string
[1] "R version 2.13.1 (2011-07-08)"
 > require(Rcpp)
 > dl <- dyn.load("mod.so")
 > mod <- Module("mod",PACKAGE=dl)
 > mod$norm(1,2)
[1] 2.236068

On 05/08/2012 06:14 PM, Dirk Eddelbuettel wrote:
>
> Hi James,
>
> On 8 May 2012 at 17:51, James Simone wrote:
> | I have followed the Rcpp developer's recommendation that a package
> | greatly simplifies using RCPP_MODULE wrappering. Unfortunately, I'm
> | having difficulty building and checking even a simple package
> | containing an Rcpp module. I have read previous posts on this topic
> | but I did not find anything helpful. I must be overlooking something
> | very simple, please help.
>
> You did the right thing.
>
> Unfortunately, things are a little bit in flux right now as some of the
> related 'module loading' code got changed recently, and not all pieces have
> been put together right.  I am flipping back and forth between our current
> SVN version and the most recent release 0.9.10, but I fear that 0.9.10 isn't
> quite right with R 2.15.0.
>
> To make matters worse, Romain appears to be mostly off email right now.
>
> So I don't have an immediate fix.  Modules loading should get better with R
> 2.15.1 making it simpler than the zzz.R you have below -- but in the meantime
> you may have to resort to non-Modules code for Rcpp.
>
> Sorry,  Dirk
>
>
> | The package check fails with this error:
> | ** testing if installed package can be loaded
> | Error : .onLoad failed in loadNamespace() for 'mod', details:
> |    call: value[[3L]](cond)
> |    error: failed to load module mod from package mod
> | no binding for "norm"
> |
> | The package skeleton was created with Rcpp.package.skeleton() to which
> | I added a C++ source file and then edited files according to the
> | 'Read-and-delete-me' file.
> |
> | Here are my build and check steps:
> |
> | $ R CMD build mod
> | * checking for file `mod/DESCRIPTION' ... OK
> | * preparing `mod':
> | * checking DESCRIPTION meta-information ... OK
> | * cleaning src
> | * checking for LF line-endings in source and make files
> | * checking for empty or unneeded directories
> | * building `mod_1.0.tar.gz'
> |
> | $ R CMD check mod
> | * using log directory '/home/simone/R/Rcpp/module/mod.Rcheck'
> | * using R version 2.13.1 (2011-07-08)
> | * using platform: x86_64-pc-linux-gnu (64-bit)
> | * using session charset: UTF-8
> | * checking for file 'mod/DESCRIPTION' ... OK
> | * checking extension type ... Package
> | * this is package 'mod' version '1.0'
> | * checking package name space information ... OK
> | * checking package dependencies ... OK
> | * checking if this is a source package ... OK
> | * checking for executable files ... OK
> | * checking whether package 'mod' can be installed ... ERROR
> | Installation failed.
> |
> | The package skeleton was created with Rcpp.package.skeleton().
> |
> | Here is the module directory structure:
> | $ /bin/ls -R mod
> | mod:
> | DESCRIPTION  man  NAMESPACE  R  Read-and-delete-me  src
> |
> | mod/man:
> | mod-package.Rd
> |
> | mod/R:
> | zzz.R
> |
> | mod/src:
> | Makevars  Makevars.win  rcpp_module.cpp
> |
> | Here are the key files:
> |
> | $ cat mod/NAMESPACE
> | useDynLib(mod)
> | exportPattern("^[[:alpha:]]+")
> | import( Rcpp )
> |
> | $ cat mod/R/zzz.R
> |
> | .onLoad<- function(libname, pkgname) {
> |      require("methods", character=TRUE, quietly=FALSE)
> |      loadRcppModules()
> | }
> |
> | $ cat mod/src/rcpp_module.cpp
> | #include<math.h>
> | #include<Rcpp.h>
> |
> | double norm( double x, double y ) {
> |    return sqrt( x*x + y*y );
> | }
> |
> | RCPP_MODULE(mod) {
> |    using namespace Rcpp;
> |    function( "norm",&norm );
> | }
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