C++ Standalone Program: register my own Octave function

[Wolfgang Betz]

Hi!

I use the Octave library inside a standalone application - this concept 
is demonstrated here:

http://hg.savannah.gnu.org/hgweb/octave/file/bb0c5e182c12/examples/code/embedded.cc
https://www.gnu.org/software/octave/doc/interpreter/Standalone-Programs.html#Standalone-Programs


My question is: I want to define a function in Octave that can 
'call-back' to my C++ application.
Has anybody an idea how this could be done?

An example:

  My C++ application registers Octave function 'myownfun' that takes 
e.g. a scalar and returns a scalar.

  In my C++ application I use it like this:

    ..
    const std::string psn = "myownfun(5.5)";
    int parse_status;
    octave_value v = eval_string (psn, false, parse_status);
    ...


I am looking forward to your feedback!
Thanks!
Wolfgang