Re: Checking octave_value equality (==) without generating an error?

[Michael Goffioul]

On Sat, Nov 22, 2014 at 4:45 PM, Daniel J Sebald <address@hidden> wrote:

Try "try".

Not sure I'm following... I was referring to a method/function in C++. Even something like the following will print an error message at octave prompt:

bool result;

// Assign ov1 and ov2 such that they're not comparable ({} == false)

octave_value ov1 (Cell ());

octave_value ov2 (false);

try

{

  result = (ov1 == ov2);

}

catch (...)

{

  result = false;

}

However, now that I'm thinking about it, what I'm looking for is something along those lines:

bool is_equal_safe (const octave_value& ov1, const octave_value& ov2)

{

  bool retval;

  unwind_protect frame;

  frame.protect_var (error_state);

  frame.protect_var (warning_state);

  frame.protect_var (discard_error_messages);

  frame.protect_var (warning_error_messages);

  discard_error_messages = true;

  discard_warning_messages = true;

  try

  {

    octave_value ov_cmp_retval = (ov1 == ov2);

    retval = ov_cmp_retval.bool_value ();

  }

  catch (octave_execution_exception)

  {

    retval = false;

  }

  return retval;

}

But this looks a bit overkill if something similar already exists in octave code base.

Michael.