[R] where is Defn.h and implementation

[Prof Brian Ripley]

On Sun, 16 Oct 2005, jiesheng zhang wrote:

> I am in the process of writing my first R extesion package.

Have you read our posting guide?  Please ask C programming questions on 
the apppropriate list -- R-devel.

Have you read `Writing R Extensions'?  It does cover this topic with 
copious warnings against what you are asking to do.

> One of my function uses StrToInternal function(I copy it from other
> extension package).

Which package is that?  Please avoid copying from packages which use
internal headers (and they probably do not work).

> I noticed the StrToInternal was defined in "Defn.h".
> I have two questions:
> 1)should "Defn.h"  be under $R_HOME/include. I could not find it in any
> file under $R_HOME/include.

No.  It is an internal header.  You could have read the Makefiles to see 
that it is not an exported header.

> 2)Where is the implementation for the functions defined in the "Defn.h"?

Almost always in src/main/*.c.

> Where dynamic library should I link to for the StrToInternal implementation?

None, you should not be calling functions not documented in `Writing R 
Extensions', and you certainly should not be asking for technical support 
to do so.

-- 
Brian D. Ripley,                  ripley at 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