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passing array from c function to c++ wrapper
From: |
grg |
Subject: |
passing array from c function to c++ wrapper |
Date: |
Tue, 1 Mar 2011 09:41:00 -0800 (PST) |
Hi there,
I'm reposting this under a different title, so that the question does not
get lost.
I'm in the process of writing my first c++ wrapper for a c function.
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 docs.
Below is my code. Please enlighten me!
Many thanks in advance.
grg
--------------------------------------------------------------------------------
#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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