passing array from c++ wrapper to c function

[grg]

Hi there,

I'm a total ignorant about C and C++, yet I'd like to create an .oct file
that allows me to run a C function from octave.

I'm stuck, because I cannot understand how to pass a double array from C++
to  C.  

I've searched the web extensively, but haven't found much help (probably
because of my ignorance).

Can you suggest a solution, please?

Thanks!
grg

below is my (not working!) t.cc C++ wrapper and included C function:
--------------------------------------------------------------------------------------------------------------------------------

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <octave/oct.h>
         
     
extern "C" 
{            
     double t (double *x)
     {
        printf ("%g\n", x[1]);                       
        printf ("%g\n", x[2]);                       
        return 0;
     }
}

    


DEFUN_DLD (t, args, , "test interpolation") 
{
   octave_value retval;
   retval = t ( args(0).data() );     
  return retval; 
} 


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