#include "myfunction.h"
double do_nothing(double *para)
{
   return para[0];
}
##</code><code>##

double do_nothing(double *)

##</code><code>##

#include "myfunction.h" (and the rest of the XSUB header files)

MODULE = Myfunction     PACKAGE = Myfunction
PROTOTYPES: ENABLE

double do_nothing(x)
   double * x

##</code><code>##

double * T_SV

##</code><code>##

my @array = (1.1,1.2);
is(&myfunction::do_nothing(\@array),1.1);