[goocanvasmm] C++11: Use of the override keyword.

[Murray Cumming <murrayc src gnome org>]

commit d3b8ad8f26ad19167f764e252a830c426db73749
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 27 10:51:48 2015 +0100

    C++11: Use of the override keyword.

 examples/custom_item/exampleitem.h |    4 ++--
 examples/demo/primitives.h         |    8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/examples/custom_item/exampleitem.h b/examples/custom_item/exampleitem.h
index 12d9d01..badfc70 100644
--- a/examples/custom_item/exampleitem.h
+++ b/examples/custom_item/exampleitem.h
@@ -29,8 +29,8 @@ public:
   static Glib::RefPtr<ExampleItem> create(double x = 0, double y = 0, double width = 0, double height = 0);
 
 protected:
-  void simple_update_vfunc(const Cairo::RefPtr<Cairo::Context>& cr);
-  void simple_paint_vfunc(const Cairo::RefPtr<Cairo::Context>& cr, const Goocanvas::Bounds& bounds);
+  void simple_update_vfunc(const Cairo::RefPtr<Cairo::Context>& cr) override;
+  void simple_paint_vfunc(const Cairo::RefPtr<Cairo::Context>& cr, const Goocanvas::Bounds& bounds) override;
 
   double m_x, m_y;
   double m_width, m_height;
diff --git a/examples/demo/primitives.h b/examples/demo/primitives.h
index 119ca4d..bc7ff8c 100644
--- a/examples/demo/primitives.h
+++ b/examples/demo/primitives.h
@@ -31,11 +31,11 @@ class Primitives : public Page
 public:
   Primitives();
 
-  virtual const Glib::ustring&
-  getName();
+  const Glib::ustring&
+  getName() override;
 
-  virtual Gtk::Widget*
-  getWidget();
+  Gtk::Widget*
+  getWidget() override;
 
 private: