Cleanup: use override specifier everywhere, and enable gcc warning to check for it.

src/render/value/choice.hpp

@@ -19,9 +19,9 @@ class ChoiceValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(Choice) : ValueViewer(parent,style) {}
   
-  virtual bool prepare(RotatedDC& dc);
-  virtual void draw(RotatedDC& dc);
-  virtual void onStyleChange(int);
+  bool prepare(RotatedDC& dc) override;
+  void draw(RotatedDC& dc) override;
+  void onStyleChange(int) override;
 };
 
 bool prepare_choice_viewer(RotatedDC& dc, ValueViewer& viewer, ChoiceStyle& style, const String& value);

src/render/value/color.hpp

@@ -21,7 +21,7 @@ class ColorValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(Color) : ValueViewer(parent,style) {}
   
-  virtual void draw(RotatedDC& dc);
-  virtual bool containsPoint(const RealPoint& p) const;
+  void draw(RotatedDC& dc) override;
+  bool containsPoint(const RealPoint& p) const override;
 };
 

src/render/value/image.hpp

@@ -21,9 +21,9 @@ class ImageValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(Image) : ValueViewer(parent,style) {}
   
-  virtual void draw(RotatedDC& dc);
-  virtual void onValueChange();
-  virtual void onStyleChange(int);
+  void draw(RotatedDC& dc) override;
+  void onValueChange() override;
+  void onStyleChange(int) override;
       
 private:
   Bitmap bitmap; ///< Cached bitmap

src/render/value/information.hpp

@@ -19,7 +19,7 @@ class InfoValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(Info) : ValueViewer(parent,style) {}
   
-  virtual void draw(RotatedDC& dc);
+  void draw(RotatedDC& dc) override;
 };
 
 

src/render/value/multiple_choice.hpp

@@ -19,9 +19,9 @@ class MultipleChoiceValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(MultipleChoice) : ValueViewer(parent,style), item_height(0) {}
   
-  virtual bool prepare(RotatedDC& dc);
-  virtual void draw(RotatedDC& dc);
-  virtual void onStyleChange(int);
+  bool prepare(RotatedDC& dc) override;
+  void draw(RotatedDC& dc) override;
+  void onStyleChange(int) override;
 protected:
   double item_height; ///< Height of a single item, or 0 if non uniform
 private:

src/render/value/package_choice.hpp

@@ -19,7 +19,7 @@ class PackageChoiceValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(PackageChoice) : ValueViewer(parent,style) { initItems(); }
   
-  virtual void draw(RotatedDC& dc);
+  void draw(RotatedDC& dc) override;
   
   struct Item{
     String package_name;

src/render/value/symbol.hpp

@@ -19,8 +19,8 @@ class SymbolValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(Symbol) : ValueViewer(parent,style) {}
   
-  virtual void draw(RotatedDC& dc);
-  void onValueChange();
+  void draw(RotatedDC& dc) override;
+  void onValueChange() override;
   
 protected:
   vector<Bitmap> symbols;  ///< Cached images

src/render/value/text.hpp

@@ -20,12 +20,12 @@ class TextValueViewer : public ValueViewer {
 public:
   DECLARE_VALUE_VIEWER(Text) : ValueViewer(parent,style) {}
   
-  virtual bool prepare(RotatedDC& dc);
-  virtual void draw(RotatedDC& dc);
-  virtual void onValueChange();
-  virtual void onStyleChange(int);
-  virtual void onAction(const Action&, bool undone);
-  virtual double getStretch() const;
+  bool prepare(RotatedDC& dc) override;
+  void draw(RotatedDC& dc) override;
+  void onValueChange() override;
+  void onStyleChange(int) override;
+  void onAction(const Action&, bool undone) override;
+  double getStretch() const override;
   
 protected:
   TextViewer v;

src/render/value/viewer.hpp

@@ -63,12 +63,12 @@ public:
   virtual void onValueChange() {}
   /// Called when a (scripted) property of the associated style has changed
   /** Default: redraws the viewer if needed */
-  virtual void onStyleChange(int changes);
+  void onStyleChange(int changes) override;
   /// Called when an action is performed on the associated value
   virtual void onAction(const Action&, bool undone) { onValueChange(); }
   
   /// Convert this viewer to an editor, if possible
-  virtual ValueEditor* getEditor() { return 0; }
+  virtual ValueEditor* getEditor() { return nullptr; }
   
   DataViewer& viewer;  ///< Our parent object
 protected: