Hello Darren,
Thank you for your advice. It makes good sense.
I now have a linker problem, and I have written some code to abstract the
problem for your viewing.
The error message is:
"Error in dyn.load(libLFile) :
unable to load shared object '/tmp/RtmpBFr1mw/file44b636b6.so':
/tmp/RtmpBFr1mw/file44b636b6.so: undefined symbol:
_Z6sumvecSt6vectorIiSaIiEE"
It seems safe to say that it cannot find the cpp file for LinkTest.h
The problem might be with how to use the"includes" argument for cxxfunction
(see 1.b below).
It seems a common enough problem, but I have not been able to gain a clearer
understanding by reading past comments on it, as most of these seem to
pertain to packages. So I will post the relevant code here, and the full
output from verbose=TRUE below it:
1. R Calling Function
linktest<-cxxfunction( signature( vec = "numeric", len = "integer" ), paste(
readLines(
"/home/simon/College/PackageOne/src/BZip/LinkTestWrap.cpp"),collapse = "\n"
) , plugin = "Rcpp",verbose=TRUE )
1.b I also tried using user includes in the cxxfunction, and taking them out
of the cpp file. But they don't seem to be parse properly in the created
code, i.e.:
"// user includes
/home/simon/College/PackageOne/src/BZip/LinkTest.h"
which the compiler naturally flags.
2. LinkTestWrap.cpp: Rcpp Wrapping Function (for use by inline)
#include <Rcpp.h>
#include <vector>
#include "/home/simon/College/PackageOne/src/BZip/LinkTest.h"
using std::vector;
vector<int> input_vector( as< vector<int> >( vec ) );
int length = as<int> ( len );
int res = sumvec( input_vector );
return Rcpp::wrap( res );
3. LinkTest.h
#include <vector>
int sumvec(std::vector<int> vec);
4.LinkTest.cpp
#include "/home/simon/College/PackageOne/src/BZip/LinkTest.h"
using std::vector;
int sumvec(vector<int> vec){
int total = 0;
for( vector<int>::const_iterator it = vec.begin(); it != vec.end(); ++it
){
total += *it;
}
return total;
}
Thanks again,
Simon
I thought the problem is with inline though. To take the link you gave:
http://stackoverflow.com/questions/3221422/gcc-template-error
One answer cites: "The errors that you have posted suggest that the problem
is within the function void init_module_PyCML(). It would therefore appear
that you have tried to define a function template within the body of another
function." I interpreted this to be due to inline because the problem with
static member variables certainly seems to be because the class and other
code is defined within a wrapper function by inline.
On Wed, Oct 12, 2011 at 12:24 AM, Darren Cook <dar...@dcook.org> wrote:
> > My apologies for not posting comprehensive code. My intention was only to
> > lessen the reading burden for you.
>
> Don't post comprehensive code :-)
> But if you can discover the smallest possible example that shows the
> problem, that will encourage lots of helpful responses.
>
>
> > I am currently getting this error:
> >
> > /home/simon/College/PackageOne/src/BZip/BinaryTree.h: In function
> ‘SEXPREC*
> > file354d98a8(SEXPREC*, SEXPREC*)’:
> > /home/simon/College/PackageOne/src/BZip/BinaryTree.h:8:1: error: expected
> > primary-expression before ‘template’
> > /home/simon/College/PackageOne/src/BZip/BinaryTree.h:8:1: error: expected
> > ‘;’ before ‘template’
>
>
> This is saying that you've not finished a statement before defining
> another one. E.g. see
> http://stackoverflow.com/questions/3221422/gcc-template-error
>
> It could mean a missing semi-colon in the file being included before
> this one. If there are no statements or #include lines before line 8 in
> BinaryTree.h, look at the files that include BinaryTree.h.
>
> > I think I can see a quick solution, (not to use the template - I don''t
> > need genericity here anyway,)...
>
> If that is true, then the Smallest Possible Example would be very
> interesting to the Rcpp developers, I'm sure.
>
> Darren
>
>
> --
> Darren Cook, Software Researcher/Developer
>
> http://dcook.org/work/ (About me and my work)
> http://dcook.org/blogs.html (My blogs and articles)
> _______________________________________________
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