Re: [Rd] Rf_errorcall - translate to Pascal

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Thu 16 Feb 2006 - 12:58:37 GMT

On Thu, 16 Feb 2006, Hans-Peter wrote:

> 2006/2/16, Hans-Peter <gchappi@gmail.com>:
>> [Rf_errorcall is not declared here, would be something like:
>> void Rf_errorcall(SEXP, const char *,...)]
>>
>> ... would it be possible to pull the Rf_errorcall
>> declaration to the error.h file?
>
> error.h doesn't look like a good place as the SEXP type is not known
> there. Sorry, I am quite unfluent with this c headers...

Yes, and their names are case-sensitive too. So it is intentional that errorcall is not in R_Ext/Error.h. Since it is needed for writing front-ends and now mentioned in Writing R Extensions it should probably be in Rinternals.h. But note that is basically the only way that a non-core programmer is going to be writing code that gets passed 'call' objects.

> As a sidenote: in Defn.h are two macrogroups:
>
> /* Promise Access Macros */
> /* Hashing Macros */
>
> which aren't declared in Rinternals.h. This is different from e.g. the groups:
>
> /* General Cons Cell Attributes */
> /* Primitive Access Macros */
> ...

This is intentional. Both Defn.h and Rinternals.h have these in a section protected by

#ifdef USE_RINTERNALS
#endif

and that section should not be regarded as public. There _are_ (mis-titled) sections

/* Promise Access Macros */
/* Hashing Macros */

in Rinternals.h, and those are the function equivalents defined for external use.

All that is public is what is documented in `Writing R Extensions': other things are in the header files but you should not assume that they will even be exported in future versions of R.

-- 
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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Received on Fri Feb 17 00:02:44 2006

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