[Rd] R_ext manual: type cast in C function registration

From: Simon Anders <anders_at_embl.de>
Date: Wed, 06 Jan 2010 16:26:26 +0100


Hi,

the "Writing R extensions" manual currently advises to register a .Call function as follows:

   R_CallMethodDef callMethods[] = {

       {"myCall", &myCall, 3},
       {NULL, NULL, 0}

   };

This produces a compiler warning, at least on my GCC, because the second slot in the R_CallMethodDef is declared as DL_FUNC (which is declared as 'typedef void * (*DL_FUNC)();').

I'd suggest to change the example code in the manual to include an explicit cast, i.e.,

   R_CallMethodDef callMethods[] = {

       {"myCall", (DL_FUNC) &myCall, 3},
       {NULL, NULL, 0}

   };

in order to get rid of an unnecessary compiler warning.

Cheers
  Simon

+---
| Dr. Simon Anders, Dipl.-Phys.
| European Molecular Biology Laboratory (EMBL), Heidelberg
| office phone +49-6221-387-8632
| preferred (permanent) e-mail: sanders_at_fs.tum.de



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