On Mon, 12 Dec 2005, Roger Bivand wrote: >> Where would be best to read about externalptr? I'm having trouble >> finding material in the manuals or the site-search. >> >> And would I need to use all the .Call machinery and C headers and SEXP >> etc in order to handle externalptr objects? > > One package using externalptr is rgdal - Tim Keitt wrote the bindings to > the external GDAL library for reading raster images to first return a > pointer to a dataset (on disk) opened by GDAL, then to use the object to > retrieve (parts of) the data. Most of the .Call/SEXP machinery is there > (for the C++ case, GDAL is C++, so GDAL manages its own memory for its > objects). The package also uses S4 classes, which may be overkill for your > purposes.
RODBC is another, somewhat simpler, one. There is documentation on developer.r-project.org, but my recollection is that is was not up to date (and in particular not re finalizers). On my TODO list is to add end-user documentation to `Writing R Extensions'. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
