Your library must be initialized before it can be used, to register the
    new types that it makes available. Also, the C library that you are wrapping
    might have its own initialization function that you should call. You can do
    this in an init() function that you can place in
    hand-coded init.h and init.cc
    files. This function should initialize your dependencies (such as the C
    function, and gtkmm) and call your generated
    wrap_init() function. For instance:
void init()
{
  Gtk::Main::init_gtkmm_internals(); //Sets up the g type system and the Glib::wrap() table.
  wrap_init(); //Tells the Glib::wrap() table about the libsomethingmm classes.
}
The implementation of the wrap_init() method in
    wrap_init.cc is generated by
    generate_wrap_init.pl, but the declaration in
    wrap_init.h is hand-coded, so you will need to adjust
    wrap_init.h so that the wrap_init()
    function appears in the correct C++ namespace.