Gtk::Object is the base class for all widgets, and for a few non-widget objects such as Gtk::CellRenderer.  
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|  | Object (Object && src) noexcept | 
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| Object & | operator= (Object && src) noexcept | 
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|  | ~Object () noexcept override | 
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|  | Object (const Object &)=delete | 
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| Object & | operator= (const Object &)=delete | 
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|  | Object (Object &&src) noexcept | 
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| Object & | operator= (Object &&src) noexcept | 
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| void * | get_data (const QueryQuark &key) | 
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| void | set_data (const Quark &key, void *data) | 
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| void | set_data_with_c_callback (const Quark &key, void *data, GDestroyNotify notify) | 
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| void | set_data (const Quark &key, void *data, DestroyNotify notify) | 
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| void | remove_data (const QueryQuark &quark) | 
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| void * | steal_data (const QueryQuark &quark) | 
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| Glib::RefPtr< Glib::Object > | wrap (GObject *object, bool take_copy=false) | 
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|  | ObjectBase (const ObjectBase &)=delete | 
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| ObjectBase & | operator= (const ObjectBase &)=delete | 
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| void | set_property_value (const Glib::ustring &property_name, const Glib::ValueBase &value) | 
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| void | get_property_value (const Glib::ustring &property_name, Glib::ValueBase &value) const | 
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| void | set_property (const Glib::ustring &property_name, const PropertyType &value) | 
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| void | get_property (const Glib::ustring &property_name, PropertyType &value) const | 
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| PropertyType | get_property (const Glib::ustring &property_name) const | 
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| sigc::connection | connect_property_changed (const Glib::ustring &property_name, const sigc::slot< void()> &slot) | 
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| sigc::connection | connect_property_changed (const Glib::ustring &property_name, sigc::slot< void()> &&slot) | 
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| void | freeze_notify () | 
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| void | thaw_notify () | 
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| virtual void | reference () const | 
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| virtual void | unreference () const | 
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| GObject * | gobj () | 
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| const GObject * | gobj () const | 
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| GObject * | gobj_copy () const | 
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Gtk::Object is the base class for all widgets, and for a few non-widget objects such as Gtk::CellRenderer. 
Gtk::Object predates Glib::Object; non-widgets that derive from Gtk::Object rather than Glib::Object do so for backward compatibility reasons.
The most interesting difference between Gtk::Object and Glib::Object is the ability to use Gtk::manage() to delegate memory management to the container widget. Gtk::Objects can also be explicitly deleted at any time, instead of using only reference-counting, and container widgets can respond when their child objects are being deleted (for instance by removing the widget).