Run clang-tidy’s modernize-use-override pass.

This adds the override specifier on all methods which override a virtual
method, whether they were already virtual or missing this specifier.

40 files changed, 210 insertions, 210 deletions

diff --git a/src/extension/internal/bluredge.h b/src/extension/internal/bluredge.h
index d8fe056f7..c30372d99 100644
--- a/src/extension/internal/bluredge.h
+++ b/src/extension/internal/bluredge.h
@@ -23,9 +23,9 @@ namespace Internal {
 class BlurEdge : public Inkscape::Extension::Implementation::Implementation {
 
 public:
-    bool load(Inkscape::Extension::Extension *module);
-    void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache);
-    Gtk::Widget * prefs_effect(Inkscape::Extension::Effect * module, Inkscape::UI::View::View * view, sigc::signal<void> * changeSignal, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache);
+    bool load(Inkscape::Extension::Extension *module) override;
+    void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache) override;
+    Gtk::Widget * prefs_effect(Inkscape::Extension::Effect * module, Inkscape::UI::View::View * view, sigc::signal<void> * changeSignal, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache) override;
 
     static void init (void);
 };
diff --git a/src/extension/internal/cairo-png-out.h b/src/extension/internal/cairo-png-out.h
index 93e3ab37f..6a66d7f3e 100644
--- a/src/extension/internal/cairo-png-out.h
+++ b/src/extension/internal/cairo-png-out.h
@@ -25,10 +25,10 @@ namespace Internal {
 class CairoRendererOutput : Inkscape::Extension::Implementation::Implementation {
 
 public:
-    bool check(Inkscape::Extension::Extension *module);
+    bool check(Inkscape::Extension::Extension *module) override;
     void save(Inkscape::Extension::Output *mod,
               SPDocument *doc,
-              gchar const *filename);
+              gchar const *filename) override;
     static void init();
 };
 
diff --git a/src/extension/internal/cairo-ps-out.h b/src/extension/internal/cairo-ps-out.h
index 3c273f6d4..e15931de4 100644
--- a/src/extension/internal/cairo-ps-out.h
+++ b/src/extension/internal/cairo-ps-out.h
@@ -27,24 +27,24 @@ namespace Internal {
 class CairoPsOutput : Inkscape::Extension::Implementation::Implementation {
 
 public:
-    bool check(Inkscape::Extension::Extension *module);
+    bool check(Inkscape::Extension::Extension *module) override;
     void save(Inkscape::Extension::Output *mod,
               SPDocument *doc,
-              gchar const *filename);
+              gchar const *filename) override;
     static void init();
-    bool textToPath(Inkscape::Extension::Print *ext);
+    bool textToPath(Inkscape::Extension::Print *ext) override;
 
 };
 
 class CairoEpsOutput : Inkscape::Extension::Implementation::Implementation {
 
 public:
-    bool check(Inkscape::Extension::Extension *module);
+    bool check(Inkscape::Extension::Extension *module) override;
     void save(Inkscape::Extension::Output *mod,
               SPDocument *doc,
-              gchar const *uri);
+              gchar const *uri) override;
     static void init();
-    bool textToPath(Inkscape::Extension::Print *ext);
+    bool textToPath(Inkscape::Extension::Print *ext) override;
 
 };
 
diff --git a/src/extension/internal/cairo-renderer-pdf-out.h b/src/extension/internal/cairo-renderer-pdf-out.h
index 5cb61444b..7910266e7 100644
--- a/src/extension/internal/cairo-renderer-pdf-out.h
+++ b/src/extension/internal/cairo-renderer-pdf-out.h
@@ -25,10 +25,10 @@ namespace Internal {
 class CairoRendererPdfOutput : Inkscape::Extension::Implementation::Implementation {
 
 public:
-    bool check(Inkscape::Extension::Extension *module);
+    bool check(Inkscape::Extension::Extension *module) override;
     void save(Inkscape::Extension::Output *mod,
               SPDocument *doc,
-              gchar const *filename);
+              gchar const *filename) override;
     static void init();
 };
 
diff --git a/src/extension/internal/cdr-input.cpp b/src/extension/internal/cdr-input.cpp
index bfba67282..e6e7d4ed4 100644
--- a/src/extension/internal/cdr-input.cpp
+++ b/src/extension/internal/cdr-input.cpp
@@ -67,7 +67,7 @@ namespace Internal {
 class CdrImportDialog : public Gtk::Dialog {
 public:
      CdrImportDialog(const std::vector<RVNGString> &vec);
-     virtual ~CdrImportDialog();
+     ~CdrImportDialog() override;
 
      bool showDialog();
      unsigned getSelectedPage();
diff --git a/src/extension/internal/cdr-input.h b/src/extension/internal/cdr-input.h
index 10af41d5a..9b7ef75db 100644
--- a/src/extension/internal/cdr-input.h
+++ b/src/extension/internal/cdr-input.h
@@ -31,7 +31,7 @@ class CdrInput : public Inkscape::Extension::Implementation::Implementation {
      CdrInput () { };
 public:
      SPDocument *open( Inkscape::Extension::Input *mod,
-                       const gchar *uri );
+                       const gchar *uri ) override;
      static void         init( void );
 
 };
diff --git a/src/extension/internal/emf-inout.h b/src/extension/internal/emf-inout.h
index 6cc4ceffb..3c2a814aa 100644
--- a/src/extension/internal/emf-inout.h
+++ b/src/extension/internal/emf-inout.h
@@ -179,16 +179,16 @@ public:
 
     Emf(); // Empty constructor
 
-    virtual ~Emf();//Destructor
+    ~Emf() override;//Destructor
 
-    bool check(Inkscape::Extension::Extension *module); //Can this module load (always yes for now)
+    bool check(Inkscape::Extension::Extension *module) override; //Can this module load (always yes for now)
 
     void save(Inkscape::Extension::Output *mod, // Save the given document to the given filename
               SPDocument *doc,
-              gchar const *filename);
+              gchar const *filename) override;
 
-    virtual SPDocument *open( Inkscape::Extension::Input *mod,
-                                const gchar *uri );
+    SPDocument *open( Inkscape::Extension::Input *mod,
+                                const gchar *uri ) override;
 
     static void init(void);//Initialize the class
 
diff --git a/src/extension/internal/emf-print.h b/src/extension/internal/emf-print.h
index 5e9a67ca1..43267dd2d 100644
--- a/src/extension/internal/emf-print.h
+++ b/src/extension/internal/emf-print.h
@@ -37,32 +37,32 @@ public:
     PrintEmf();
 
     /* Print functions */
-    virtual unsigned int setup (Inkscape::Extension::Print * module);
+    unsigned int setup (Inkscape::Extension::Print * module) override;
 
-    virtual unsigned int begin (Inkscape::Extension::Print * module, SPDocument *doc);
-    virtual unsigned int finish (Inkscape::Extension::Print * module);
+    unsigned int begin (Inkscape::Extension::Print * module, SPDocument *doc) override;
+    unsigned int finish (Inkscape::Extension::Print * module) override;
 
     /* Rendering methods */
-    virtual unsigned int fill (Inkscape::Extension::Print *module,
+    unsigned int fill (Inkscape::Extension::Print *module,
                                Geom::PathVector const &pathv,
                                Geom::Affine const &ctm, SPStyle const *style,
                                Geom::OptRect const &pbox, Geom::OptRect const &dbox,
-                               Geom::OptRect const &bbox);
-    virtual unsigned int stroke (Inkscape::Extension::Print * module,
+                               Geom::OptRect const &bbox) override;
+    unsigned int stroke (Inkscape::Extension::Print * module,
                                  Geom::PathVector const &pathv,
                                  Geom::Affine const &ctm, SPStyle const *style,
                                  Geom::OptRect const &pbox, Geom::OptRect const &dbox,
-                                 Geom::OptRect const &bbox);
-    virtual unsigned int image(Inkscape::Extension::Print *module,
+                                 Geom::OptRect const &bbox) override;
+    unsigned int image(Inkscape::Extension::Print *module,
                            unsigned char *px,
                            unsigned int w,
                            unsigned int h,
                            unsigned int rs,
                            Geom::Affine const &transform,
-                           SPStyle const *style);
-    virtual unsigned int comment(Inkscape::Extension::Print *module, const char * comment);
-    virtual unsigned int text(Inkscape::Extension::Print *module, char const *text,
-                              Geom::Point const &p, SPStyle const *style);
+                           SPStyle const *style) override;
+    unsigned int comment(Inkscape::Extension::Print *module, const char * comment) override;
+    unsigned int text(Inkscape::Extension::Print *module, char const *text,
+                              Geom::Point const &p, SPStyle const *style) override;
 
     static void init (void);
 protected:
@@ -77,10 +77,10 @@ protected:
     Geom::Point get_pathrect_corner(Geom::Path pathRect, double angle, int corner);
     U_TRIVERTEX make_trivertex(Geom::Point Pt, U_COLORREF uc);
     int         vector_rect_alignment(double angle, Geom::Point vtest);
-    int         create_brush(SPStyle const *style, PU_COLORREF fcolor);
-    void        destroy_brush();
-    int         create_pen(SPStyle const *style, const Geom::Affine &transform);
-    void        destroy_pen();
+    int         create_brush(SPStyle const *style, PU_COLORREF fcolor) override;
+    void        destroy_brush() override;
+    int         create_pen(SPStyle const *style, const Geom::Affine &transform) override;
+    void        destroy_pen() override;
 };
 
 }  /* namespace Internal */
diff --git a/src/extension/internal/filter/bevels.h b/src/extension/internal/filter/bevels.h
index 68e94ad3d..91fe2f8cf 100644
--- a/src/extension/internal/filter/bevels.h
+++ b/src/extension/internal/filter/bevels.h
@@ -41,11 +41,11 @@ namespace Filter {
 
 class DiffuseLight : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     DiffuseLight ( ) : Filter() { };
-    virtual ~DiffuseLight ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~DiffuseLight ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -121,11 +121,11 @@ DiffuseLight::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class MatteJelly : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     MatteJelly ( ) : Filter() { };
-    virtual ~MatteJelly ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~MatteJelly ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -205,11 +205,11 @@ MatteJelly::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class SpecularLight : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     SpecularLight ( ) : Filter() { };
-    virtual ~SpecularLight ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~SpecularLight ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/blurs.h b/src/extension/internal/filter/blurs.h
index 859fadb87..0956b23b6 100644
--- a/src/extension/internal/filter/blurs.h
+++ b/src/extension/internal/filter/blurs.h
@@ -42,11 +42,11 @@ namespace Filter {
 
 class Blur : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Blur ( ) : Filter() { };
-    virtual ~Blur ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Blur ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -113,11 +113,11 @@ Blur::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class CleanEdges : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     CleanEdges ( ) : Filter() { };
-    virtual ~CleanEdges ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~CleanEdges ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -173,11 +173,11 @@ CleanEdges::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class CrossBlur : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     CrossBlur ( ) : Filter() { };
-    virtual ~CrossBlur ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~CrossBlur ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -248,11 +248,11 @@ CrossBlur::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Feather : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Feather ( ) : Filter() { };
-    virtual ~Feather ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Feather ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -313,11 +313,11 @@ Feather::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class ImageBlur : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ImageBlur ( ) : Filter() { };
-    virtual ~ImageBlur ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ImageBlur ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/bumps.h b/src/extension/internal/filter/bumps.h
index cbda5ea35..95f6170f3 100644
--- a/src/extension/internal/filter/bumps.h
+++ b/src/extension/internal/filter/bumps.h
@@ -68,11 +68,11 @@ namespace Filter {
 
 class Bump : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Bump ( ) : Filter() { };
-    virtual ~Bump ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Bump ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -297,11 +297,11 @@ Bump::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class WaxBump : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     WaxBump ( ) : Filter() { };
-    virtual ~WaxBump ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~WaxBump ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/color.h b/src/extension/internal/filter/color.h
index 921ff3171..063073267 100644
--- a/src/extension/internal/filter/color.h
+++ b/src/extension/internal/filter/color.h
@@ -62,11 +62,11 @@ namespace Filter {
 */
 class Brilliance : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Brilliance ( ) : Filter() { };
-    virtual ~Brilliance ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Brilliance ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -142,11 +142,11 @@ Brilliance::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class ChannelPaint : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ChannelPaint ( ) : Filter() { };
-    virtual ~ChannelPaint ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ChannelPaint ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
     
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -243,11 +243,11 @@ ChannelPaint::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class ColorBlindness : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ColorBlindness ( ) : Filter() { };
-    virtual ~ColorBlindness ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ColorBlindness ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
     
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -318,11 +318,11 @@ ColorBlindness::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class ColorShift : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ColorShift ( ) : Filter() { };
-    virtual ~ColorShift ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ColorShift ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -381,11 +381,11 @@ ColorShift::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Colorize : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Colorize ( ) : Filter() { };
-    virtual ~Colorize ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Colorize ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -488,11 +488,11 @@ Colorize::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class ComponentTransfer : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ComponentTransfer ( ) : Filter() { };
-    virtual ~ComponentTransfer ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ComponentTransfer ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -573,11 +573,11 @@ ComponentTransfer::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Duochrome : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Duochrome ( ) : Filter() { };
-    virtual ~Duochrome ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Duochrome ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -698,11 +698,11 @@ Duochrome::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class ExtractChannel : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ExtractChannel ( ) : Filter() { };
-    virtual ~ExtractChannel ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ExtractChannel ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -804,11 +804,11 @@ ExtractChannel::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class FadeToBW : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     FadeToBW ( ) : Filter() { };
-    virtual ~FadeToBW ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~FadeToBW ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -883,11 +883,11 @@ FadeToBW::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class Greyscale : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Greyscale ( ) : Filter() { };
-    virtual ~Greyscale ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Greyscale ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -969,11 +969,11 @@ Greyscale::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Invert : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Invert ( ) : Filter() { };
-    virtual ~Invert ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Invert ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1104,11 +1104,11 @@ Invert::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class Lighting : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Lighting ( ) : Filter() { };
-    virtual ~Lighting ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Lighting ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1175,11 +1175,11 @@ Lighting::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class LightnessContrast : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     LightnessContrast ( ) : Filter() { };
-    virtual ~LightnessContrast ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~LightnessContrast ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1254,11 +1254,11 @@ LightnessContrast::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class NudgeRGB : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     NudgeRGB ( ) : Filter() { };
-    virtual ~NudgeRGB ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~NudgeRGB ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1366,11 +1366,11 @@ NudgeRGB::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class NudgeCMY : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     NudgeCMY ( ) : Filter() { };
-    virtual ~NudgeCMY ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~NudgeCMY ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1472,11 +1472,11 @@ NudgeCMY::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Quadritone : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Quadritone ( ) : Filter() { };
-    virtual ~Quadritone ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Quadritone ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1555,11 +1555,11 @@ Quadritone::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class SimpleBlend : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     SimpleBlend ( ) : Filter() { };
-    virtual ~SimpleBlend ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~SimpleBlend ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
     
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1641,11 +1641,11 @@ SimpleBlend::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Solarize : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Solarize ( ) : Filter() { };
-    virtual ~Solarize ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Solarize ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -1728,11 +1728,11 @@ Solarize::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Tritone : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Tritone ( ) : Filter() { };
-    virtual ~Tritone ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Tritone ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/distort.h b/src/extension/internal/filter/distort.h
index 56aab51f5..6d1fc0a75 100644
--- a/src/extension/internal/filter/distort.h
+++ b/src/extension/internal/filter/distort.h
@@ -55,11 +55,11 @@ namespace Filter {
 
 class FeltFeather : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     FeltFeather ( ) : Filter() { };
-    virtual ~FeltFeather ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~FeltFeather ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -178,11 +178,11 @@ FeltFeather::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Roughen : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Roughen ( ) : Filter() { };
-    virtual ~Roughen ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Roughen ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/filter-file.cpp b/src/extension/internal/filter/filter-file.cpp
index c18879430..07a7eb0af 100644
--- a/src/extension/internal/filter/filter-file.cpp
+++ b/src/extension/internal/filter/filter-file.cpp
@@ -78,9 +78,9 @@ void Filter::filters_all_files(void)
 class mywriter : public Inkscape::IO::BasicWriter {
 	Glib::ustring _str;
 public:
-	void close(void);
-	void flush(void);
-	void put (gunichar ch);
+	void close(void) override;
+	void flush(void) override;
+	void put (gunichar ch) override;
 	gchar const * c_str (void) { return _str.c_str(); }
 };
 
diff --git a/src/extension/internal/filter/filter.h b/src/extension/internal/filter/filter.h
index 8fa086b69..ea4ae2302 100644
--- a/src/extension/internal/filter/filter.h
+++ b/src/extension/internal/filter/filter.h
@@ -42,11 +42,11 @@ private:
 public:
 	Filter();
 	Filter(gchar const * filter);
-	virtual ~Filter();
+	~Filter() override;
 
-	bool load(Inkscape::Extension::Extension *module);
-	Inkscape::Extension::Implementation::ImplementationDocumentCache * newDocCache (Inkscape::Extension::Extension * ext, Inkscape::UI::View::View * doc);
-	void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache);
+	bool load(Inkscape::Extension::Extension *module) override;
+	Inkscape::Extension::Implementation::ImplementationDocumentCache * newDocCache (Inkscape::Extension::Extension * ext, Inkscape::UI::View::View * doc) override;
+	void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache) override;
 
 	static void filter_init(gchar const * id, gchar const * name, gchar const * submenu, gchar const * tip, gchar const * filter);
 	static void filters_all(void);
diff --git a/src/extension/internal/filter/image.h b/src/extension/internal/filter/image.h
index 868588f80..9cbe05e2f 100644
--- a/src/extension/internal/filter/image.h
+++ b/src/extension/internal/filter/image.h
@@ -37,11 +37,11 @@ namespace Filter {
 */
 class EdgeDetect : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     EdgeDetect ( ) : Filter() { };
-    virtual ~EdgeDetect ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~EdgeDetect ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/morphology.h b/src/extension/internal/filter/morphology.h
index e1785f7d3..025cca8fe 100644
--- a/src/extension/internal/filter/morphology.h
+++ b/src/extension/internal/filter/morphology.h
@@ -46,11 +46,11 @@ namespace Filter {
 
 class Crosssmooth : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Crosssmooth ( ) : Filter() { };
-    virtual ~Crosssmooth ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Crosssmooth ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -154,11 +154,11 @@ Crosssmooth::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Outline : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Outline ( ) : Filter() { };
-    virtual ~Outline ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Outline ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/overlays.h b/src/extension/internal/filter/overlays.h
index f6c0509c8..a0436e2ad 100644
--- a/src/extension/internal/filter/overlays.h
+++ b/src/extension/internal/filter/overlays.h
@@ -44,11 +44,11 @@ namespace Filter {
 
 class NoiseFill : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     NoiseFill ( ) : Filter() { };
-    virtual ~NoiseFill ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~NoiseFill ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/paint.h b/src/extension/internal/filter/paint.h
index 43f4b6c90..653008fc6 100644
--- a/src/extension/internal/filter/paint.h
+++ b/src/extension/internal/filter/paint.h
@@ -59,11 +59,11 @@ namespace Filter {
 */
 class Chromolitho : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Chromolitho ( ) : Filter() { };
-    virtual ~Chromolitho ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Chromolitho ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -220,11 +220,11 @@ Chromolitho::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class CrossEngraving : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     CrossEngraving ( ) : Filter() { };
-    virtual ~CrossEngraving ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~CrossEngraving ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -319,11 +319,11 @@ CrossEngraving::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Drawing : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Drawing ( ) : Filter() { };
-    virtual ~Drawing ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Drawing ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -482,11 +482,11 @@ Drawing::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class Electrize : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Electrize ( ) : Filter() { };
-    virtual ~Electrize ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Electrize ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -572,11 +572,11 @@ Electrize::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class NeonDraw : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     NeonDraw ( ) : Filter() { };
-    virtual ~NeonDraw ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~NeonDraw ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -675,11 +675,11 @@ NeonDraw::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class PointEngraving : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     PointEngraving ( ) : Filter() { };
-    virtual ~PointEngraving ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~PointEngraving ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -838,11 +838,11 @@ PointEngraving::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class Posterize : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Posterize ( ) : Filter() { };
-    virtual ~Posterize ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Posterize ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -961,11 +961,11 @@ Posterize::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class PosterizeBasic : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     PosterizeBasic ( ) : Filter() { };
-    virtual ~PosterizeBasic ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~PosterizeBasic ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/protrusions.h b/src/extension/internal/filter/protrusions.h
index d6fd315db..c4cd2a688 100644
--- a/src/extension/internal/filter/protrusions.h
+++ b/src/extension/internal/filter/protrusions.h
@@ -35,11 +35,11 @@ namespace Filter {
 */
 class Snow : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-	virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+	gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
 	Snow ( ) : Filter() { };
-	virtual ~Snow ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+	~Snow ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
 public:
 	static void init (void) {
diff --git a/src/extension/internal/filter/shadows.h b/src/extension/internal/filter/shadows.h
index e69e05669..cca34e2a2 100644
--- a/src/extension/internal/filter/shadows.h
+++ b/src/extension/internal/filter/shadows.h
@@ -45,11 +45,11 @@ namespace Filter {
 */
 class ColorizableDropShadow : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ColorizableDropShadow ( ) : Filter() { };
-    virtual ~ColorizableDropShadow ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ColorizableDropShadow ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/filter/textures.h b/src/extension/internal/filter/textures.h
index a2584c627..39b1789b3 100644
--- a/src/extension/internal/filter/textures.h
+++ b/src/extension/internal/filter/textures.h
@@ -49,11 +49,11 @@ namespace Filter {
 */
 class InkBlot : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-	virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+	gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
 	InkBlot ( ) : Filter() { };
-	virtual ~InkBlot ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+	~InkBlot ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
 public:
 	static void init (void) {
diff --git a/src/extension/internal/filter/transparency.h b/src/extension/internal/filter/transparency.h
index da89498bb..b3498a638 100644
--- a/src/extension/internal/filter/transparency.h
+++ b/src/extension/internal/filter/transparency.h
@@ -41,11 +41,11 @@ namespace Filter {
 
 class Blend : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Blend ( ) : Filter() { };
-    virtual ~Blend ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Blend ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -118,11 +118,11 @@ Blend::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class ChannelTransparency : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     ChannelTransparency ( ) : Filter() { };
-    virtual ~ChannelTransparency ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~ChannelTransparency ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
     
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -193,11 +193,11 @@ ChannelTransparency::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class LightEraser : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     LightEraser ( ) : Filter() { };
-    virtual ~LightEraser ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~LightEraser ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
     
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -267,11 +267,11 @@ LightEraser::get_filter_text (Inkscape::Extension::Extension * ext)
 */
 class Opacity : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Opacity ( ) : Filter() { };
-    virtual ~Opacity ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Opacity ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
     
     static void init (void) {
         Inkscape::Extension::build_from_mem(
@@ -329,11 +329,11 @@ Opacity::get_filter_text (Inkscape::Extension::Extension * ext)
 
 class Silhouette : public Inkscape::Extension::Internal::Filter::Filter {
 protected:
-    virtual gchar const * get_filter_text (Inkscape::Extension::Extension * ext);
+    gchar const * get_filter_text (Inkscape::Extension::Extension * ext) override;
 
 public:
     Silhouette ( ) : Filter() { };
-    virtual ~Silhouette ( ) { if (_filter != NULL) g_free((void *)_filter); return; }
+    ~Silhouette ( ) override { if (_filter != NULL) g_free((void *)_filter); return; }
 
     static void init (void) {
         Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/gdkpixbuf-input.h b/src/extension/internal/gdkpixbuf-input.h
index 2e03a96db..347277e90 100644
--- a/src/extension/internal/gdkpixbuf-input.h
+++ b/src/extension/internal/gdkpixbuf-input.h
@@ -10,7 +10,7 @@ namespace Internal {
 class GdkpixbufInput : Inkscape::Extension::Implementation::Implementation {
 public:
     SPDocument *open(Inkscape::Extension::Input *mod,
-                     char const *uri);
+                     char const *uri) override;
     static void init();
 };
 
diff --git a/src/extension/internal/gimpgrad.h b/src/extension/internal/gimpgrad.h
index c34de840d..790c43b75 100644
--- a/src/extension/internal/gimpgrad.h
+++ b/src/extension/internal/gimpgrad.h
@@ -25,9 +25,9 @@ namespace Internal {
 class GimpGrad : public Inkscape::Extension::Implementation::Implementation
 {
 public:
-    bool load(Inkscape::Extension::Extension *module);
-    void unload(Inkscape::Extension::Extension *module);
-    SPDocument *open(Inkscape::Extension::Input *module, gchar const *filename);
+    bool load(Inkscape::Extension::Extension *module) override;
+    void unload(Inkscape::Extension::Extension *module) override;
+    SPDocument *open(Inkscape::Extension::Input *module, gchar const *filename) override;
 
     static void init();
 };
diff --git a/src/extension/internal/grid.h b/src/extension/internal/grid.h
index c54135d81..7d25c7b20 100644
--- a/src/extension/internal/grid.h
+++ b/src/extension/internal/grid.h
@@ -23,9 +23,9 @@ namespace Internal {
 class Grid : public Inkscape::Extension::Implementation::Implementation {
 
 public:
-    bool load(Inkscape::Extension::Extension *module);
-    void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache);
-    Gtk::Widget * prefs_effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View * view, sigc::signal<void> * changeSignal, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache);
+    bool load(Inkscape::Extension::Extension *module) override;
+    void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *document, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache) override;
+    Gtk::Widget * prefs_effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View * view, sigc::signal<void> * changeSignal, Inkscape::Extension::Implementation::ImplementationDocumentCache * docCache) override;
 
     static void init (void);
 };
diff --git a/src/extension/internal/javafx-out.h b/src/extension/internal/javafx-out.h
index ec1cde032..f9d209b86 100644
--- a/src/extension/internal/javafx-out.h
+++ b/src/extension/internal/javafx-out.h
@@ -51,13 +51,13 @@ public:
     /**
      * Check whether we can actually output using this module
      */
-	virtual bool check (Inkscape::Extension::Extension * module);
+	bool check (Inkscape::Extension::Extension * module) override;
 
     /**
      * API call to perform the output to a file
      */
-    virtual void save(Inkscape::Extension::Output *mod,
-                      SPDocument *doc, gchar const *filename);
+    void save(Inkscape::Extension::Output *mod,
+                      SPDocument *doc, gchar const *filename) override;
 
     /**
      * Inkscape runtime startup call.
diff --git a/src/extension/internal/latex-pstricks-out.h b/src/extension/internal/latex-pstricks-out.h
index a12cdc3c1..842a52655 100644
--- a/src/extension/internal/latex-pstricks-out.h
+++ b/src/extension/internal/latex-pstricks-out.h
@@ -22,13 +22,13 @@ class LatexOutput : Inkscape::Extension::Implementation::Implementation { //This
 public:
     LatexOutput(); // Empty constructor
 
-    virtual ~LatexOutput();//Destructor
+    ~LatexOutput() override;//Destructor
 
-    bool check(Inkscape::Extension::Extension *module); //Can this module load (always yes for now)
+    bool check(Inkscape::Extension::Extension *module) override; //Can this module load (always yes for now)
 
     void save(Inkscape::Extension::Output *mod, // Save the given document to the given filename
               SPDocument *doc,
-              gchar const *filename);
+              gchar const *filename) override;
 
     static void init(void);//Initialize the class
 };
diff --git a/src/extension/internal/latex-pstricks.h b/src/extension/internal/latex-pstricks.h
index 5bc6eeb22..9b9519c55 100644
--- a/src/extension/internal/latex-pstricks.h
+++ b/src/extension/internal/latex-pstricks.h
@@ -38,28 +38,28 @@ class PrintLatex : public Inkscape::Extension::Implementation::Implementation {
 
 public:
         PrintLatex (void);
-        virtual ~PrintLatex (void);
+        ~PrintLatex (void) override;
 
         /* Print functions */
-        virtual unsigned int setup (Inkscape::Extension::Print * module);
+        unsigned int setup (Inkscape::Extension::Print * module) override;
 
-        virtual unsigned int begin (Inkscape::Extension::Print * module, SPDocument *doc);
-        virtual unsigned int finish (Inkscape::Extension::Print * module);
+        unsigned int begin (Inkscape::Extension::Print * module, SPDocument *doc) override;
+        unsigned int finish (Inkscape::Extension::Print * module) override;
 
         /* Rendering methods */
-        virtual unsigned int bind(Inkscape::Extension::Print *module, Geom::Affine const &transform, float opacity);
-        virtual unsigned int release(Inkscape::Extension::Print *module);
+        unsigned int bind(Inkscape::Extension::Print *module, Geom::Affine const &transform, float opacity) override;
+        unsigned int release(Inkscape::Extension::Print *module) override;
 
-        virtual unsigned int fill (Inkscape::Extension::Print *module, Geom::PathVector const &pathv,
+        unsigned int fill (Inkscape::Extension::Print *module, Geom::PathVector const &pathv,
                                    Geom::Affine const &ctm, SPStyle const *style,
                                    Geom::OptRect const &pbox, Geom::OptRect const &dbox,
-                                   Geom::OptRect const &bbox);
-        virtual unsigned int stroke (Inkscape::Extension::Print *module, Geom::PathVector const &pathv,
+                                   Geom::OptRect const &bbox) override;
+        unsigned int stroke (Inkscape::Extension::Print *module, Geom::PathVector const &pathv,
                                      Geom::Affine const &ctm, SPStyle const *style,
                                      Geom::OptRect const &pbox, Geom::OptRect const &dbox,
-                                     Geom::OptRect const &bbox);
-        virtual unsigned int comment(Inkscape::Extension::Print *module, const char * comment);
-        bool textToPath (Inkscape::Extension::Print * ext);
+                                     Geom::OptRect const &bbox) override;
+        unsigned int comment(Inkscape::Extension::Print *module, const char * comment) override;
+        bool textToPath (Inkscape::Extension::Print * ext) override;
 
         static void init (void);
 };
diff --git a/src/extension/internal/metafile-inout.h b/src/extension/internal/metafile-inout.h
index fd6ef28a8..f8562839e 100644
--- a/src/extension/internal/metafile-inout.h
+++ b/src/extension/internal/metafile-inout.h
@@ -63,7 +63,7 @@ class Metafile
 {
 public:
     Metafile() {}
-    ~Metafile();
+    ~Metafile() override;
 
 protected:
     static uint32_t    sethexcolor(U_COLORREF color);
diff --git a/src/extension/internal/metafile-print.h b/src/extension/internal/metafile-print.h
index eac93cbda..156610657 100644
--- a/src/extension/internal/metafile-print.h
+++ b/src/extension/internal/metafile-print.h
@@ -49,11 +49,11 @@ class PrintMetafile
 {
 public:
     PrintMetafile() {}
-    ~PrintMetafile();
+    ~PrintMetafile() override;
 
-    bool textToPath (Inkscape::Extension::Print * ext);
-    unsigned int bind(Inkscape::Extension::Print *module, Geom::Affine const &transform, float opacity);
-    unsigned int release(Inkscape::Extension::Print *module);
+    bool textToPath (Inkscape::Extension::Print * ext) override;
+    unsigned int bind(Inkscape::Extension::Print *module, Geom::Affine const &transform, float opacity) override;
+    unsigned int release(Inkscape::Extension::Print *module) override;
 
 protected:
     struct GRADVALUES {
diff --git a/src/extension/internal/odf.h b/src/extension/internal/odf.h
index 2e01d2e49..1c1d7c6f6 100644
--- a/src/extension/internal/odf.h
+++ b/src/extension/internal/odf.h
@@ -266,11 +266,11 @@ class OdfOutput : public Inkscape::Extension::Implementation::Implementation
 
 public:
 
-    bool check (Inkscape::Extension::Extension * module);
+    bool check (Inkscape::Extension::Extension * module) override;
 
     void save  (Inkscape::Extension::Output *mod,
 	        SPDocument *doc,
-	        gchar const *filename);
+	        gchar const *filename) override;
 
     static void   init  (void);
 
diff --git a/src/extension/internal/pdfinput/pdf-input.h b/src/extension/internal/pdfinput/pdf-input.h
index a70d40a23..ae820946d 100644
--- a/src/extension/internal/pdfinput/pdf-input.h
+++ b/src/extension/internal/pdfinput/pdf-input.h
@@ -63,7 +63,7 @@ class PdfImportDialog : public Gtk::Dialog
 {
 public:
     PdfImportDialog(PDFDoc *doc, const gchar *uri);
-    virtual ~PdfImportDialog();
+    ~PdfImportDialog() override;
 
     bool showDialog();
     int getSelectedPage();
@@ -135,9 +135,9 @@ class PdfInput: public Inkscape::Extension::Implementation::Implementation {
     PdfInput () { };
 public:
     SPDocument *open( Inkscape::Extension::Input *mod,
-                                const gchar *uri );
+                                const gchar *uri ) override;
     static void         init( void );
-    virtual bool wasCancelled();
+    bool wasCancelled() override;
 private:
     bool _cancelled;
 };
diff --git a/src/extension/internal/pov-out.h b/src/extension/internal/pov-out.h
index 3f7aa7e90..75ae0460d 100644
--- a/src/extension/internal/pov-out.h
+++ b/src/extension/internal/pov-out.h
@@ -54,13 +54,13 @@ public:
     /**
      * Check whether we can actually output using this module
      */
-	bool check (Inkscape::Extension::Extension * module);
+	bool check (Inkscape::Extension::Extension * module) override;
 
     /**
      * API call to perform the output to a file
      */
     void save(Inkscape::Extension::Output *mod,
-              SPDocument *doc, gchar const *filename);
+              SPDocument *doc, gchar const *filename) override;
 
     /**
      * Inkscape runtime startup call.
diff --git a/src/extension/internal/svg.h b/src/extension/internal/svg.h
index b97735dd8..a7b593d54 100644
--- a/src/extension/internal/svg.h
+++ b/src/extension/internal/svg.h
@@ -24,11 +24,11 @@ namespace Internal {
 class Svg : public Inkscape::Extension::Implementation::Implementation {
 
 public:
-    virtual void        save( Inkscape::Extension::Output *mod,
+    void        save( Inkscape::Extension::Output *mod,
                                SPDocument *doc,
-                               gchar const *filename );
-    virtual SPDocument *open( Inkscape::Extension::Input *mod,
-                                const gchar *uri );
+                               gchar const *filename ) override;
+    SPDocument *open( Inkscape::Extension::Input *mod,
+                                const gchar *uri ) override;
     static void         init( void );
 
 };
diff --git a/src/extension/internal/vsd-input.cpp b/src/extension/internal/vsd-input.cpp
index 7c92a895d..b650e2876 100644
--- a/src/extension/internal/vsd-input.cpp
+++ b/src/extension/internal/vsd-input.cpp
@@ -66,7 +66,7 @@ namespace Internal {
 class VsdImportDialog : public Gtk::Dialog {
 public:
      VsdImportDialog(const std::vector<RVNGString> &vec);
-     virtual ~VsdImportDialog();
+     ~VsdImportDialog() override;
 
      bool showDialog();
      unsigned getSelectedPage();
diff --git a/src/extension/internal/vsd-input.h b/src/extension/internal/vsd-input.h
index acc52debf..2cc20747a 100644
--- a/src/extension/internal/vsd-input.h
+++ b/src/extension/internal/vsd-input.h
@@ -31,7 +31,7 @@ class VsdInput : public Inkscape::Extension::Implementation::Implementation {
      VsdInput () { };
 public:
      SPDocument *open( Inkscape::Extension::Input *mod,
-                       const gchar *uri );
+                       const gchar *uri ) override;
      static void         init( void );
 
 };
diff --git a/src/extension/internal/wmf-inout.h b/src/extension/internal/wmf-inout.h
index 19cf53956..02280f6d8 100644
--- a/src/extension/internal/wmf-inout.h
+++ b/src/extension/internal/wmf-inout.h
@@ -172,16 +172,16 @@ class Wmf : public Metafile
 public:
     Wmf(); // Empty constructor
 
-    virtual ~Wmf();//Destructor
+    ~Wmf() override;//Destructor
 
-    bool check(Inkscape::Extension::Extension *module); //Can this module load (always yes for now)
+    bool check(Inkscape::Extension::Extension *module) override; //Can this module load (always yes for now)
 
     void save(Inkscape::Extension::Output *mod, // Save the given document to the given filename
               SPDocument *doc,
-              gchar const *filename);
+              gchar const *filename) override;
 
-    virtual SPDocument *open( Inkscape::Extension::Input *mod,
-                                const gchar *uri );
+    SPDocument *open( Inkscape::Extension::Input *mod,
+                                const gchar *uri ) override;
 
     static void init(void);//Initialize the class
 
diff --git a/src/extension/internal/wmf-print.h b/src/extension/internal/wmf-print.h
index be35da717..c271e3cf7 100644
--- a/src/extension/internal/wmf-print.h
+++ b/src/extension/internal/wmf-print.h
@@ -37,41 +37,41 @@ public:
     PrintWmf();
 
     /* Print functions */
-    virtual unsigned int setup (Inkscape::Extension::Print * module);
+    unsigned int setup (Inkscape::Extension::Print * module) override;
 
-    virtual unsigned int begin (Inkscape::Extension::Print * module, SPDocument *doc);
-    virtual unsigned int finish (Inkscape::Extension::Print * module);
+    unsigned int begin (Inkscape::Extension::Print * module, SPDocument *doc) override;
+    unsigned int finish (Inkscape::Extension::Print * module) override;
 
     /* Rendering methods */
-    virtual unsigned int fill (Inkscape::Extension::Print *module,
+    unsigned int fill (Inkscape::Extension::Print *module,
                                Geom::PathVector const &pathv,
                                Geom::Affine const &ctm, SPStyle const *style,
                                Geom::OptRect const &pbox, Geom::OptRect const &dbox,
-                               Geom::OptRect const &bbox);
-    virtual unsigned int stroke (Inkscape::Extension::Print * module,
+                               Geom::OptRect const &bbox) override;
+    unsigned int stroke (Inkscape::Extension::Print * module,
                                  Geom::PathVector const &pathv,
                                  Geom::Affine const &ctm, SPStyle const *style,
                                  Geom::OptRect const &pbox, Geom::OptRect const &dbox,
-                                 Geom::OptRect const &bbox);
-    virtual unsigned int image(Inkscape::Extension::Print *module,
+                                 Geom::OptRect const &bbox) override;
+    unsigned int image(Inkscape::Extension::Print *module,
                            unsigned char *px,
                            unsigned int w,
                            unsigned int h,
                            unsigned int rs,
                            Geom::Affine const &transform,
-                           SPStyle const *style);
-    virtual unsigned int comment(Inkscape::Extension::Print *module, const char * comment);
-    virtual unsigned int text(Inkscape::Extension::Print *module, char const *text,
-                              Geom::Point const &p, SPStyle const *style);
+                           SPStyle const *style) override;
+    unsigned int comment(Inkscape::Extension::Print *module, const char * comment) override;
+    unsigned int text(Inkscape::Extension::Print *module, char const *text,
+                              Geom::Point const &p, SPStyle const *style) override;
 
     static void init (void);
 protected:
     static void  smuggle_adxky_out(const char *string, int16_t **adx, double *ky, int *rtl, int *ndx, float scale);
 
-    int create_brush(SPStyle const *style, PU_COLORREF fcolor);
-    void destroy_brush();
-    int create_pen(SPStyle const *style, const Geom::Affine &transform);
-    void destroy_pen();
+    int create_brush(SPStyle const *style, PU_COLORREF fcolor) override;
+    void destroy_brush() override;
+    int create_pen(SPStyle const *style, const Geom::Affine &transform) override;
+    void destroy_pen() override;
 };
 
 }  /* namespace Internal */
diff --git a/src/extension/internal/wpg-input.h b/src/extension/internal/wpg-input.h
index ca882039b..4ee041eb9 100644
--- a/src/extension/internal/wpg-input.h
+++ b/src/extension/internal/wpg-input.h
@@ -25,7 +25,7 @@ class WpgInput : public Inkscape::Extension::Implementation::Implementation {
     WpgInput () { };
 public:
     SPDocument *open( Inkscape::Extension::Input *mod,
-                                const gchar *uri );
+                                const gchar *uri ) override;
     static void         init( void );
 
 };