[Rcpp-devel] Hello world for Rcpp modules

[Dirk Eddelbuettel]

Hi Chris,

On 11 August 2011 at 22:23, Chris DuBois wrote:
| Hi all,
| 
| I've created a package using Rcpp.package.skeleton("pkg",module=TRUE).  
| 
| If I create a file R/hello_world2.R with the following
| 
| show(World)
| b <- new(World)
| b$greet()
| b$set("hello everybody")
| b$greet()
| rm(b)
| 
| then I receive an "execution halted" error when I try to compile the package
| using R CMD INSTALL pkg.  Why is this?  
| 
| I've included my steps below.
| 
| > library(Rcpp)  # latest version from CRAN
| > Rcpp.package.skeleton("pkg",module=TRUE)
| Creating directories ...
| Creating DESCRIPTION ...
| Creating NAMESPACE ...
| Creating Read-and-delete-me ...
| Saving functions and data ...
| Making help files ...
| Done.
| Further steps are described in './pkg/Read-and-delete-me'.
| 
| Adding Rcpp settings
|  >> added RcppModules: yada
|  >> added Depends: Rcpp
|  >> added LinkingTo: Rcpp
|  >> added useDynLib directive to NAMESPACE
|  >> added Makevars file with Rcpp settings
|  >> added Makevars.win file with Rcpp settings
|  >> added example header file using Rcpp classes
|  >> added example src file using Rcpp classes
|  >> added example R file calling the C++ example
|  >> added Rd file for rcpp_hello_world
|  >> copied the example module 
| > q()
| Save workspace image? [y/n/c]: n
| chris at seldon:~/Documents/networkstats$ R CMD INSTALL pkg
| * installing to library ‘/home/chris/R/i486-pc-linux-gnu-library/2.10’

Rcpp has dependended on R (>= 2.12) for quite some time, and Module
definitely requires it.

How did you get Rcpp installed on that version of R, and what version of Rcpp
is it?

Something like the example you show here is part of the unit tests and
clearly works with current R and Rcpp versions.  Can you get hold of a newer
R somewhere to try it?

Dirk

| * installing *source* package ‘pkg’ ...
| ** libs
| g++ -I/usr/share/R/include   -I"/home/chris/R/i486-pc-linux-gnu-library/2.10/
| Rcpp/include"   -fpic  -O3 -pipe  -g -c rcpp_hello_world.cpp -o
| rcpp_hello_world.o
| g++ -I/usr/share/R/include   -I"/home/chris/R/i486-pc-linux-gnu-library/2.10/
| Rcpp/include"   -fpic  -O3 -pipe  -g -c rcpp_module.cpp -o rcpp_module.o
| g++ -shared -o pkg.so rcpp_hello_world.o rcpp_module.o -L/home/chris/R/
| i486-pc-linux-gnu-library/2.10/Rcpp/lib -lRcpp -Wl,-rpath,/home/chris/R/
| i486-pc-linux-gnu-library/2.10/Rcpp/lib -L/usr/lib/R/lib -lR
| installing to /home/chris/R/i486-pc-linux-gnu-library/2.10/pkg/libs
| ** R
| ** preparing package for lazy loading
| ** help
| Warning: /home/chris/Documents/networkstats/pkg/man/pkg-package.Rd:32: All text
| must be in a section
| Warning: /home/chris/Documents/networkstats/pkg/man/pkg-package.Rd:33: All text
| must be in a section
| *** installing help indices
| ** building package indices ...
| ** testing if installed package can be loaded
| 
| * DONE (pkg)
| chris at seldon:~/Documents/networkstats$ R
| R version 2.13.1 (2011-07-08)
| > library(pkg)
| Loading required package: Rcpp
| > source("pkg/R/rcpp_hello_world.R")
| > rcpp_hello_world()  # works as expected
| [[1]]
| [1] "foo" "bar"
| 
| [[2]]
| [1] 0 1
| > q()
| chris at seldon:~/Documents/networkstats$ cp rcpp_hello_world2.R pkg/R/
| chris at seldon:~/Documents/networkstats$ R CMD INSTALL pkg
| * installing to library ‘/home/chris/R/i486-pc-linux-gnu-library/2.10’
| * installing *source* package ‘pkg’ ...
| ** libs
| make: Nothing to be done for `all'.
| installing to /home/chris/R/i486-pc-linux-gnu-library/2.10/pkg/libs
| ** R
| ** preparing package for lazy loading
| Execution halted
| 
| 
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-- 
Two new Rcpp master classes for R and C++ integration scheduled for 
New York (Sep 24) and San Francisco (Oct 8), more details are at
http://dirk.eddelbuettel.com/blog/2011/08/04#rcpp_classes_2011-09_and_2011-10
http://www.revolutionanalytics.com/products/training/public/rcpp-master-class.php