[Rcpp-devel] calling a homegrown cpp function from my own package when using sourceCpp

Søren Højsgaard sorenh at math.aau.dk
Mon Dec 30 15:27:40 CET 2013

Thanks for your answers, Romain and Dirk!

I am reluctant to follow Romains suggestion because the package has a lot of c-code in it, so using load_all() takes quite some time because all c and c++ code is being compiled. (Maybe that is just slow on windows? I tried on linux (ubuntu) too but I can't get devtools installed (because RCurl for some reason can't be installed)).

I am following Dirks suggestion (and I believe that I am following section 3.5 in "Rcpp Attributes"): I have:

#include <mypack.h>
using namespace Rcpp;

NumericVector aperm2_cpp(NumericVector AA, IntegerVector adim, IntegerVector perm){
  NumericVector out( AA.length() );
  IntegerVector pp = permuteCellEntries_cpp(perm, adim);

/*** R

x <- HairEyeColor
pp <- c(2,3,1)
aperm(x, pp)
aperm2_cpp(x, dim(x), pp)

In file included from c:/programs/R/current/library/mypack/include/mypack.h:7:0,
                 from perm-array14.cpp:1:
c:/programs/R/current/library/mypack/include/mypack_RcppExports.h:7:27: fatal error: RcppArmadillo.h: No such file or directory
compilation terminated.
make: *** [perm-array14.o] Error 1
Warning message:
running command 'make -f "c:/programs/R/current/etc/x64/Makeconf" -f "c:/programs/R/current/share/make/winshlib.mk" SHLIB_LDFLAGS='$(SHLIB_CXXLDFLAGS)' SHLIB_LD='$(SHLIB_CXXLD)' SHLIB="sourceCpp_63425.dll" WIN=64 TCLBIN=64 OBJECTS="perm-array14.o"' had status 2 
g++ -m64 -I"c:/programs/R/current/include" -DNDEBUG     -I"c:/programs/R/current/library/Rcpp/include" -I"c:/programs/R/current/library/mypack/include"  -I"d:/RCompile/CRANpkg/extralibs64/local/include"     -O2 -Wall  -mtune=core2 -c perm-array14.cpp -o perm-array14.o 
Error in sourceCpp("perm-array14.cpp") : 
  Error 1 occurred building shared library.

I am sorry but I am a bit lost here. I've taken the liberty to attach my package and the "new file" in case anyone has a moment to look at it.

Thanks in advance for any additional help.

All the best

-----Original Message-----
From: Dirk Eddelbuettel [mailto:edd at debian.org] 
Sent: 30. december 2013 03:13
To: Søren Højsgaard
Cc: rcpp-devel at r-forge.wu-wien.ac.at
Subject: Re: [Rcpp-devel] calling a homegrown cpp function from my own package when using sourceCpp

Hi Søren,

On 30 December 2013 at 01:59, Søren Højsgaard wrote:
| I have created a function c++ function foo which I export with //[[Rcpp::export]]. I've put the file foo.cpp with the function into the src dir of the package mypack; I've run compileAttributes and I can see the function in mypack_RcppExport.h and the automatically generated interface to the function is available in R (these Rcpp-attributes really make life easier).
| Now I want to develop another function bar in the file bar.cpp and bar 
| depends on foo. I want to develop bar using sourceCpp("bar.cpp") but I can not figure out how to make my c++ function foo available to bar. In bar.cpp I have //[[Rcpp::depends(mypack)]] but that does not make foo available.
| Is it possible to do what I want (I believe it is from the documentation?) or is there another "workaround"??

I think Section 3.5 in the vignette 'Rcpp Attributes' is what you want here.

Happy New Year to you too!


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