A new (and somewhat tiny) package is on CRAN and I just blogged / tweeted about it, see eg http://dirk.eddelbuettel.com/blog/2014/11/16#rcppannoy_0.0.2 or http://dirk.eddelbuettel.com/code/rcpp.annoy.html
I mostly mention it here because of two aspects I enjoyed while writing the package: i) Rcpp Modules for templated classes Gregory Jefferis asked about this topic in a thread on this list back in September, see http://thread.gmane.org/gmane.comp.lang.r.rcpp/7599 for the thread. After a few posts Romain reminded us all of the useful (albeit un(der)documented RCPP_EXPOSED_CLASS_NODECL which is what I ended up using here too. Thanks to everybody who participated in that thread; we now have a simple example package for it too. ii) Interacting with Python Annoy is a small C++ library which ships with a small Python module providing access -- and we get the exact same functionality in R via Rcpp Modules. So if you ever need to wrap something you have in C++ used by R, this may be a nice stanza to go the other way. From what I know about Python, this seems like old-school packaging, ie no Cython or Theano or other fancypants (as this is AFAIK used in production by Spotify -- with the usual restrictions on older compilers and toolchains, ie Erik put a small ifdef in for a much older Boost library). Just straight up C++ into Python, and now R. We nicely reuse the same mmap'ed index file, and of course get the same results in either language. Cheers, Dirk -- http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
