Re: [Rd] external pointers

From: Byron Ellis <ellis_at_stat.harvard.edu>
Date: Mon 12 Dec 2005 - 21:20:45 GMT

There's also Luke's own site, in particular http://www.stat.uiowa.edu/ ~luke/R/weakfinex.html

On Dec 12, 2005, at 12:16 AM, Prof Brian Ripley wrote:

> 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, ripley@stats.ox.ac.uk
> 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
>
> ______________________________________________
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---
Byron Ellis (ellis@stat.harvard.edu)
"Oook" -- The Librarian

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Received on Tue Dec 13 08:25:25 2005

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