[gtkmm] "manage" and Glib::RefPtr

[Christof Petig <christof petig-baender de>]

Just a theoretical question (which might solve some memory managaement 
problems if possible):

Is it possible to write a manage_ref 'function' which would ...
- destroy the widget once no RefPtr (or C ref) to it is left
- not get the widget destroyed once it's container is destroyed but 
unrefed (unlike manage, IIRC manage does set some gtk+ flag which 
enables unconditional destruction)

This would allow code like
{ Glib::RefPtr<Gtk::Window> w=manage_ref(new Gtk::Window(...));
   ...
  { Glib::RefPtr<Gtk::Label> l=manage_ref(new Gtk::Label("test"));
    w.add(l);
  }
  ...
  // w leavess the scope
  // => w gets destroyed, the Label unrefed (and then destroyed)
}
and if I understand correctly this would solve the destroy vs. unref 
problem with widgets. IIRC this would also not force us to use RefPtrs 
for any function arguments (function arguments outlive the call).

Correct me if I'm wrong
   Christof