[Rd] beginner's guide to C++ programming with R packages?
ross at biostat.ucsf.edu
Sat Jul 4 03:53:11 CEST 2009
On Fri, 2009-06-26 at 16:17 -0400, Whit Armstrong wrote:
> > But this draws me back to the basic question. I don't want to run R
> > CMD INSTALL 20 times per hour. How do developers "actually" test
> > their code?
> check out RUnit for tests.
> as for testing c++ code. I have taken an approach which is probably
> different than most. I try to build my package as a c++ library that
> can be used independent of R. Then you can test your library with
> whatever c++ test suite that you prefer. Once you are happy, then
I also have C++ tests that operate separately from R, though I have a
very small library of stub R functions to get the thing to build. There
have been some tricky issues with R (if one links to the regular R
library) and the test framework fighting over who was "main." I think
that's why I switched to the stub.
Working only with R level tests alone does not permit the kind of lower
level testing that you can get by running your own unit tests. I use
the boost unit test framework.
Of course, you want R level tests too. Some of my upper level C++ tests
are mirror images of R tests; this can help identify if a problem lies
at the interface.
For C++ tests I build my code in conjunction with a main program.
I think I also have or had a test building it as a library, but I don't
use that much.
For R, my modules get built into a library.
It's usually cleaner to build the R library from a fresh version of the
sources; otherwise scraps of my other builds tend to end up in the R
Thanks, Whit, for the pointers to Rcpp and RAbstraction.
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