Re: passing array from c++ wrapper to c function

[grg]

Andy, 
Thanks a lot for the suggestion.

Now, I am stuck again, because I cannot pass back to C++ a vector from C.
Instead of the vector I get a logical.
I've tried to read the Dal Segno Al Coda, DaCodaAlFine, but I am too
clueless about C++ to be able to understand those.

Below if my function now.   Please enlighten me!

--------------------------------------------------------------------------------
#include <stdlib.h>
#include <stdio.h>
#include <octave/oct.h>
    
extern "C" 
{              
     double* t2 (double *x, int lenx)
     {
     int i;
     double out[lenx-1];
                           
        for (i=0; i<=lenx-1; i++)
        {
            out[i]=x[i]*2;
            printf ("%g\n", out[i]);
        }                            
        return out;
     }
}


DEFUN_DLD (t2, args, , "test interpolation") 
{
    octave_value_list retval;    
    Array<double> ar = args(0).array_value ();     
    retval(0) = octave_value( t2 (ar.fortran_vec(), ar.length()) ); 
        
  return retval ; 
} 

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