Is it possible to do this? In particular I want to toggle between warning ("off", "Octave:broadcast") and warning ("on", "Octave:broadcast"), i.e. set warning off at the beginning of the .oct file and then set warning on just before the .oct file returns its output. Of course I could do this in the terminal or in the calling script file, but I'd like to do it in the .oct file itself if possible.
There's two ways to do it in C++, very similar to the Octave language itself.
disable_warning (const std::string& id);
set_warning_state (const std::string &id, const std::string &state);
Actually, disable_warning is just wrapper around the second option set_warning_state (id, "off"). Take a look into the error.cc for more options related to this. I'm sure you can figure out yourself how to turn the warning back on at the end ;)