Re: [R] where is Defn.h and implementation

From: Prof Brian Ripley <>
Date: Mon 17 Oct 2005 - 00:13:34 EST

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,        
Professor of Applied Statistics,
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 Mon Oct 17 00:18:39 2005

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