NULL ptr semantic in wrapped methods

[Frank Naumann <fnaumann boerde de>]

Hello!

As I'm looking a little bit on C gtk examples too I discovered that some 
gtk calls explicitly allow NULL pointers for some arguments. In this case 
defaults are used by gtk.

But I can't find counterparts in the C++ wrapped methods. They use 
references and thus strictly require an argument even if it's not 
necessary. I saw this for example on Gdk::Window::invalidate_rect 
(rect argument) and Gtk::Style::paint_layout (area argument). I'm sure 
there are some more too.

Is this a bug and should be reported or do I oversee something?


Regards,
Frank