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

double do_nothing(double *)

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

...

double do_nothing(x)
   double * x

double * T_SV

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