Implicit castable structs

[Frank Benoit]

Kris schrieb:
> Yeah, that's old-school inheritance. But I think it's probably a bit dodgy 
> to sidestep type-safety to do what you want. Besides, it's not hard to write 
> this instead (the old school way):
> 
> #  gtk_widget_foo (&bin->container.widget);
> 

hm yes, this is certainly true.

GtkMessageDialog* msgdlg;
gtk_widget_foo (&msgdlg.dialog.window.bin.container.widget);
gtk_widget_foo (cast(GtkWidget*)msgdlg);

Both are bad, the second can be shorter.
Even if i hate explicit upcast, in this case I prefer it :)