Trying to compile example code from Octave's Standalone Programs example, getting segfault on first line

Question

I am trying to learn how to embed Octave in my C++ code. When running the second example from here , the code compiles fine, but when running the code, a segmentation fault appears in the first line, when trying to initialize the interpreter. I'm not extremely adept at C++ but even when looking it up I can't find any answers.

The original code had octave::feval instead of feval, that threw a different, namespace error, so I just got rid of that and added the parse.h in the includes. I doubt this is at all related to the issue but that is a modification I did do.

#include <iostream>
#include <octave/oct.h>
#include <octave/octave.h>
#include <octave/parse.h>
#include <octave/interpreter.h>

int
main (void)
{
  // Create interpreter.

  octave::interpreter interpreter;

  try
    {
      int status = interpreter.execute ();

      if (status != 0)
        {
          std::cerr << "creating embedded Octave interpreter failed!"
                    << std::endl;
          return status;
        }

      octave_idx_type n = 2;
      octave_value_list in;

      for (octave_idx_type i = 0; i < n; i++)
        in(i) = octave_value (5 * (i + 2));

      octave_value_list out = feval ("gcd", in, 1);

      if (out.length () > 0)
        std::cout << "GCD of ["
                  << in(0).int_value ()
                  << ", "
                  << in(1).int_value ()
                  << "] is " << out(0).int_value ()
                  << std::endl;
      else
        std::cout << "invalid\n";
    }
  catch (const octave::exit_exception& ex)
    {
      std::cerr << "Octave interpreter exited with status = "
                << ex.exit_status () << std::endl;
    }
  catch (const octave::execution_exception&)
    {
      std::cerr << "error encountered in Octave evaluator!" << std::endl;
    }

  return 0;
}

The actual output is supposed to be:

GCD of [10, 15] is 5

I am using Linux Ubuntu 18.04 with Octave 4.2.2

Answer 1

The documentation looked at is a different version than the version I have installed on my computer. I have 4.2, but I was looking at 4.4 docs, which has different code for the task I was trying to accomplish.