Argh.. Apologies guys.. Found the error myself.
Constructor and deconstructor must be specified with {} even if no code is
foreseen for them.
A novice error, hope at least highlighting it could be useful to other newbies
like me :-)
cheers,
Francesco
On 6 Jul 2012, at 15:37, Lescai, Francesco wrote:
> Hi there,
> I've seen other posts similar to this one, but I'm a complete novice in the
> use of Rcpp and couldn't really figure out how to solve the issue.
>
> I'm learning how to use Rcpp before connecting R to some C++ classes I'm
> developing.
> I started with a simple home made example, but in both cases compiling .cpp
> and header files or compiling inline code, I get the same outcome error
> "unable to load shared object" and then "Symbol not found" with some
> characters before and after my class name.
>
> I've seen Mac OS might have some issues, therefore I tested it also on an
> Ubuntu virtual machine, but the result is the same error message.
> Also, I'm using an R-devel version here but I'm having the same problem with
> R 14 as well.
> I'll copy below all the relevant information (bit lengthy, I'm sorry).
>
> I'd really appreciate some help here to point me in the right direction.
> thanks very much,
> Francesco
>
>
> ------case 1 - external files -------------------
>
> PKG_CPPFLAGS=`Rscript -e 'Rcpp:::CxxFlags()'` PKG_LIBS=`Rscript -e
> 'Rcpp:::LdFlags()'` R CMD SHLIB example.cpp
> g++ -arch x86_64 -I/Library/Frameworks/R.framework/Resources/include
> -I/Library/Frameworks/R.framework/Resources/include/x86_64 -DNDEBUG
> -I/Library/Frameworks/R.framework/Versions/2.16/Resources/library/Rcpp/include
> -I/usr/local/include -fPIC -g -O2 -c example.cpp -o example.o
> g++ -arch x86_64 -dynamiclib -Wl,-headerpad_max_install_names -undefined
> dynamic_lookup -single_module -multiply_defined suppress -L/usr/local/lib -o
> example.so example.o
> /Library/Frameworks/R.framework/Versions/2.16/Resources/library/Rcpp/lib/x86_64/libRcpp.a
> -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework
> -Wl,CoreFoundation
>
>> library(Rcpp)
>> library(inline)
>> dyn.load("example.so")
> Error in dyn.load("example.so") :
> unable to load shared object
> '/Users/rehbfle/Documents/CPPexercise/RCPP/example.so':
> dlopen(/Users/rehbfle/Documents/CPPexercise/RCPP/example.so, 6): Symbol not
> found: __ZN7exampleD1Ev
> Referenced from: /Users/rehbfle/Documents/CPPexercise/RCPP/example.so
> Expected in: flat namespace
> in /Users/rehbfle/Documents/CPPexercise/RCPP/example.so
>
>
> ---------case 2 - inline code-----------------------------------------
>
> fx<-cxxfunction(signature(), plugin="Rcpp", include=inc)
> Error in dyn.load(libLFile) :
> unable to load shared object
> '/var/folders/qj/p9_mz7r9661gynb8w88sfbvhy6s5_l/T//RtmpaMinm3/file34b510aaf8e3.so':
>
> dlopen(/var/folders/qj/p9_mz7r9661gynb8w88sfbvhy6s5_l/T//RtmpaMinm3/file34b510aaf8e3.so,
> 6): Symbol not found: __ZN7exampleC1Eii
> Referenced from:
> /var/folders/qj/p9_mz7r9661gynb8w88sfbvhy6s5_l/T//RtmpaMinm3/file34b510aaf8e3.so
> Expected in: flat namespace
> in
> /var/folders/qj/p9_mz7r9661gynb8w88sfbvhy6s5_l/T//RtmpaMinm3/file34b510aaf8e3.so
>
>
> Below the code details:
>
> example.h
> -------------------------
> #ifndef EXAMPLE_H
> #define EXAMPLE_H
>
> class example
> {
>
> private:
> float resultone;
> int resultwo;
> public:
> example(int x, int y);
> ~example();
> float multiply(int x, int y);
> int doublex(int x);
>
> };
>
>
> #endif
>
>
> example.cpp
> ---------------------------
> #include "example.h"
> #include <Rcpp.h>
>
> using namespace Rcpp;
>
> example::example(int x, int y){}
>
> float example::multiply(int x, int y){
> resultone = x * y;
> return resultone;
> }
>
> int example::doublex(int x){
> resultwo = x * 2;
> return resultwo;
> }
>
> RCPP_MODULE(prova){
>
> class_<example>("example")
> .constructor<int,int>()
> .method("square", &example::multiply)
> .method("doppio", &example::doublex)
> ;
> }
>
>
> ----------inline code----------------
> inc <-'using namespace Rcpp;
> class example
> {
> private:
> float resultone;
> int resultwo;
>
> public:
> example(int x, int y);
> ~example();
> float multiply(int x, int y){
> resultone = x * y;
> return resultone;
> }
> int doublex(int x){
> resultwo = x * 2;
> return resultwo;
> }
>
> };
>
> RCPP_MODULE(prova){
>
> class_<example>("example")
> .constructor<int,int>()
> .method("square", &example::multiply)
> .method("doppio", &example::doublex)
> ;
> }'
>
>
> -----------------
>> sessionInfo()
> R Under development (unstable) (2012-07-02 r59715)
> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
> locale:
> [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> other attached packages:
> [1] inline_0.3.8 Rcpp_0.9.13
>
>
>
>
>
>
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> [email protected]
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>
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