Here is a list of all namespace members with links to the namespace documentation for each member:

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- OK : Gdk , Gtk::Stock
- OPEN : Gtk::Stock
- operator&() : Gdk , Gtk , Gdk , Gtk , Gdk , Gtk , Gdk , Gtk , Gdk , Gtk , Gdk , Gtk
- operator&=() : Gdk , Gtk
- operator^() : Gdk , Gtk , Gdk
- operator^=() : Gdk , Gtk
- operator|() : Gtk , Gdk , Gtk , Gdk , Gtk
- operator|=() : Gdk , Gtk , Gdk , Gtk , Gdk , Gtk
- operator~() : Gtk , Gdk , Gtk , Gdk , Gtk , Gdk , Gtk
- Orientation : Gtk
- ORIENTATION_HORIZONTAL : Gtk
- ORIENTATION_LANDSCAPE : Gtk::Stock
- ORIENTATION_PORTRAIT : Gtk::Stock
- ORIENTATION_REVERSE_LANDSCAPE : Gtk::Stock
- ORIENTATION_REVERSE_PORTRAIT : Gtk::Stock
- ORIENTATION_VERTICAL : Gtk
- OWNER_CHANGE : Gdk
- OWNERSHIP_APPLICATION : Gdk
- OWNERSHIP_NONE : Gdk
- OWNERSHIP_WINDOW : Gdk