[Rcpp-devel] Fwd: package contains overloaded methods in module

[Chaomei Lo]

I think the problem was because the user's module was not loaded in zzz.R
file, and after I added my own module name manually. It works !.  However,
I would like to know what is the correct way to do it.  When I created the
package, I provided the c++ file of my own as below, is there anyway the
custom module can be added after creating the skeleton package if I
provided a source cpp file.  Also if there are more classes and modules in
different .cpp files, should I just have to manually add each of them into
the zzz.R file ?

> library(Rcpp)
> Rcpp.package.skeleton(name="testModule1", cpp_files="./test_module.cpp",
module=TRUE)
Creating directories ...
Creating DESCRIPTION ...
Creating NAMESPACE ...
Creating Read-and-delete-me ...
Saving functions and data ...
Making help files ...
Done.
Further steps are described in './testModule1/Read-and-delete-me'.
Adding Rcpp settings
 >> added RcppModules: yada, stdVector, NumEx
 >> added Imports: Rcpp
 >> added LinkingTo: Rcpp
 >> added useDynLib directive to NAMESPACE
 >> added importFrom(Rcpp, loadModule) directive to NAMESPACE
 >> added importFrom(Rcpp, evalCpp) directive to NAMESPACE
 >> copied /people/d3j508/Wyoming/test_module.cpp to src directory
 >> added example src file using Rcpp attributes
 >> compiled Rcpp attributes
 >> added Rd file for rcpp_hello_world
 >> copied the example module file

Thanks a lot.
Chaomei
---------- Forwarded message ----------
From: Chaomei Lo <chaomeilo at gmail.com>
Date: Tue, Jul 1, 2014 at 11:29 PM
Subject: package contains overloaded methods in module
To: rcpp-devel at lists.r-forge.r-project.org


I use Romain's example as follows (after /// line).  It works fine with the
sourceCpp(..). However, with the package I created, it loaded fine but I
got this error below when I instantiate the class. -Thanks for help.

 > library("testModule", lib.loc="/people/me/.Rlibs")
> r <- new( Randomizer )
Error in .getClassFromCache(Class, where) : object 'Randomizer' not found

////////////////////////////////////////////////////////
#include <Rcpp.h>

using namespace Rcpp;

class Randomizer {
public:

     Randomizer(){}

        NumericVector get( int n ){
                RNGScope scope ;
                return runif( n, 0.0, 1.0 );
        }

        NumericVector get( int n, double min ){
                RNGScope scope ;
                return runif( n, min, 1.0 );
        }

        NumericVector get( int n, double min, double max ){
                RNGScope scope ;
                return runif( n, min, max );
        }

} ;


RCPP_MODULE(mod){

      // helping the compiler disambiguate things
     NumericVector (Randomizer::*get_1)(int) = &Randomizer::get ;
     NumericVector (Randomizer::*get_2)(int,double) = &Randomizer::get ;
     NumericVector (Randomizer::*get_3)(int,double,double) =
&Randomizer::get ;

        class_<Randomizer>( "Randomizer" )

            .default_constructor()

                .method( "get" , get_1 )
                .method( "get" , get_2 )
                .method( "get" , get_3 )
                ;


}
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