Run clang-tidy’s modernize-redundant-void-arg pass.

106 files changed, 349 insertions, 349 deletions

diff --git a/src/extension/db.h b/src/extension/db.h
index 73e735ac0..19595e840 100644
--- a/src/extension/db.h
+++ b/src/extension/db.h
@@ -55,7 +55,7 @@ private:
     static void foreach_internal (gpointer in_key, gpointer in_value, gpointer in_data);
 
 public:
-    DB (void);
+    DB ();
     Extension * get (const gchar *key);
     void register_ext (Extension *module);
     void unregister_ext (Extension *module);
diff --git a/src/extension/dependency.cpp b/src/extension/dependency.cpp
index 07462e5e7..054fc9b2a 100644
--- a/src/extension/dependency.cpp
+++ b/src/extension/dependency.cpp
@@ -94,7 +94,7 @@ Dependency::Dependency (Inkscape::XML::Node * in_repr)
 
     Unreference the XML structure.
 */
-Dependency::~Dependency (void)
+Dependency::~Dependency ()
 {
     Inkscape::GC::release(_repr);
 }
@@ -129,7 +129,7 @@ Dependency::~Dependency (void)
     found then a TRUE is returned.  If we get all the way through the
     path then a FALSE is returned, the command could not be found.
 */
-bool Dependency::check (void) const
+bool Dependency::check () const
 {
     // std::cout << "Checking: " << *this << std::endl;
 
diff --git a/src/extension/dependency.h b/src/extension/dependency.h
index 5e58fe06b..e97965cc5 100644
--- a/src/extension/dependency.h
+++ b/src/extension/dependency.h
@@ -56,11 +56,11 @@ class Dependency {
 
 public:
     Dependency  (Inkscape::XML::Node * in_repr);
-    virtual ~Dependency (void);
-    bool check  (void) const;
+    virtual ~Dependency ();
+    bool check  () const;
     const gchar* get_name();
-    Glib::ustring &get_help (void) const;
-    Glib::ustring &get_link (void) const;
+    Glib::ustring &get_help () const;
+    Glib::ustring &get_link () const;
 
     friend std::ostream & operator<< (std::ostream &out_file, const Dependency & in_dep);
 }; /* class Dependency */
diff --git a/src/extension/effect.cpp b/src/extension/effect.cpp
index 8be5287a2..1cf624ad0 100644
--- a/src/extension/effect.cpp
+++ b/src/extension/effect.cpp
@@ -207,7 +207,7 @@ Effect::merge_menu (Inkscape::XML::Node * base,
     return;
 }
 
-Effect::~Effect (void)
+Effect::~Effect ()
 {
     if (get_last_effect() == this)
         set_last_effect(nullptr);
@@ -217,7 +217,7 @@ Effect::~Effect (void)
 }
 
 bool
-Effect::check (void)
+Effect::check ()
 {
     if (!Extension::check()) {
         /** \todo  Check to see if parent has this as its only child,
@@ -346,13 +346,13 @@ Effect::find_menu (Inkscape::XML::Node * menustruct, const gchar *name)
 
 
 Gtk::VBox *
-Effect::get_info_widget(void)
+Effect::get_info_widget()
 {
     return Extension::get_info_widget();
 }
 
 PrefDialog *
-Effect::get_pref_dialog (void)
+Effect::get_pref_dialog ()
 {
     return _prefDialog;
 }
diff --git a/src/extension/effect.h b/src/extension/effect.h
index 5481d420a..b37e2bc7e 100644
--- a/src/extension/effect.h
+++ b/src/extension/effect.h
@@ -106,26 +106,26 @@ class Effect : public Extension {
 public:
                  Effect  (Inkscape::XML::Node * in_repr,
                           Implementation::Implementation * in_imp);
-        ~Effect  (void) override;
-    bool check                (void) override;
+        ~Effect  () override;
+    bool check                () override;
     bool         prefs   (Inkscape::UI::View::View * doc);
     void         effect  (Inkscape::UI::View::View * doc);
     /** \brief  Accessor function for a pointer to the verb */
-    Inkscape::Verb * get_verb (void) { return &_verb; };
+    Inkscape::Verb * get_verb () { return &_verb; };
 
     /** \brief  Static function to get the last effect used */
-    static Effect *  get_last_effect (void) { return _last_effect; };
+    static Effect *  get_last_effect () { return _last_effect; };
     static void      set_last_effect (Effect * in_effect);
 
-    static void      place_menus (void);
+    static void      place_menus ();
     void             place_menu (Inkscape::XML::Node * menus);
 
-    Gtk::VBox *    get_info_widget(void);
+    Gtk::VBox *    get_info_widget();
 
     bool no_doc; // if true, the effect does not process SVG document at all, so no need to save, read, and watch for errors
     bool no_live_preview; // if true, the effect does not need "live preview" checkbox in its dialog
 
-    PrefDialog *get_pref_dialog (void);
+    PrefDialog *get_pref_dialog ();
     void        set_pref_dialog (PrefDialog * prefdialog);
 private:
     static gchar *   remove_ (gchar * instr);
diff --git a/src/extension/error-file.cpp b/src/extension/error-file.cpp
index 20dcc0f5f..fdfe87db8 100644
--- a/src/extension/error-file.cpp
+++ b/src/extension/error-file.cpp
@@ -39,7 +39,7 @@ namespace Extension {
     it should always be checked if you can see the dialog, but it is
     probably good to check anyway).
 */
-ErrorFileNotice::ErrorFileNotice (void) :
+ErrorFileNotice::ErrorFileNotice () :
     Gtk::MessageDialog(
             "",                    /* message */
             false,                 /* use markup */
@@ -80,7 +80,7 @@ ErrorFileNotice::ErrorFileNotice (void) :
 
 /** \brief Sets the preferences based on the checkbox value */
 void
-ErrorFileNotice::checkbox_toggle (void)
+ErrorFileNotice::checkbox_toggle ()
 {
     // std::cout << "Toggle value" << std::endl;
     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
@@ -93,7 +93,7 @@ ErrorFileNotice::checkbox_toggle (void)
     user wants to see the dialog, otherwise it just exits.
 */
 int
-ErrorFileNotice::run (void)
+ErrorFileNotice::run ()
 {
     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
     if (!prefs->getBool(PREFERENCE_ID, true))
diff --git a/src/extension/error-file.h b/src/extension/error-file.h
index e710c0e4e..c4983e7e7 100644
--- a/src/extension/error-file.h
+++ b/src/extension/error-file.h
@@ -23,10 +23,10 @@ class ErrorFileNotice : public Gtk::MessageDialog {
     /** The checkbutton, this is so we can figure out when it gets checked */
     Gtk::CheckButton * checkbutton;
 
-    void checkbox_toggle(void);
+    void checkbox_toggle();
 public:
-    ErrorFileNotice (void);
-    int run (void);
+    ErrorFileNotice ();
+    int run ();
 };
 
 }; };  /* namespace Inkscape, Extension */
diff --git a/src/extension/execution-env.cpp b/src/extension/execution-env.cpp
index 0e0688f44..9a1733eea 100644
--- a/src/extension/execution-env.cpp
+++ b/src/extension/execution-env.cpp
@@ -63,7 +63,7 @@ ExecutionEnv::ExecutionEnv (Effect * effect, Inkscape::UI::View::View * doc, Imp
 
     Destroys the dialog if created and the document cache.
 */
-ExecutionEnv::~ExecutionEnv (void) {
+ExecutionEnv::~ExecutionEnv () {
     if (_visibleDialog != nullptr) {
         _visibleDialog->hide();
         delete _visibleDialog;
@@ -79,7 +79,7 @@ ExecutionEnv::~ExecutionEnv (void) {
     from the effect's implementation.
 */
 void
-ExecutionEnv::genDocCache (void) {
+ExecutionEnv::genDocCache () {
     if (_docCache == nullptr) {
         // printf("Gen Doc Cache\n");
         _docCache = _effect->get_imp()->newDocCache(_effect, _doc);
@@ -92,7 +92,7 @@ ExecutionEnv::genDocCache (void) {
     Just delete it.
 */
 void
-ExecutionEnv::killDocCache (void) {
+ExecutionEnv::killDocCache () {
     if (_docCache != nullptr) {
         // printf("Killed Doc Cache\n");
         delete _docCache;
@@ -107,7 +107,7 @@ ExecutionEnv::killDocCache (void) {
     And make sure to connect to the cancel.
 */
 void
-ExecutionEnv::createWorkingDialog (void) {
+ExecutionEnv::createWorkingDialog () {
     if (_visibleDialog != nullptr) {
         _visibleDialog->hide();
         delete _visibleDialog;
@@ -153,7 +153,7 @@ ExecutionEnv::workingCanceled( const int /*resp*/) {
 }
 
 void
-ExecutionEnv::cancel (void) {
+ExecutionEnv::cancel () {
     SPDesktop *desktop = (SPDesktop *)_doc;
     desktop->clearWaitingCursor();
     _effect->get_imp()->cancelProcessing();
@@ -161,13 +161,13 @@ ExecutionEnv::cancel (void) {
 }
 
 void
-ExecutionEnv::undo (void) {
+ExecutionEnv::undo () {
     DocumentUndo::cancel(_doc->doc());
     return;
 }
 
 void
-ExecutionEnv::commit (void) {
+ExecutionEnv::commit () {
     DocumentUndo::done(_doc->doc(), SP_VERB_NONE, _(_effect->get_name()));
     Effect::set_last_effect(_effect);
     _effect->get_imp()->commitDocument();
@@ -176,7 +176,7 @@ ExecutionEnv::commit (void) {
 }
 
 void
-ExecutionEnv::reselect (void) {
+ExecutionEnv::reselect () {
     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
     if(desktop) {
         Inkscape::Selection * selection = desktop->getSelection();
@@ -188,7 +188,7 @@ ExecutionEnv::reselect (void) {
 }
 
 void
-ExecutionEnv::run (void) {
+ExecutionEnv::run () {
     _state = ExecutionEnv::RUNNING;
     if (_show_working) {
         createWorkingDialog();
@@ -203,12 +203,12 @@ ExecutionEnv::run (void) {
 }
 
 void
-ExecutionEnv::runComplete (void) {
+ExecutionEnv::runComplete () {
     _mainloop->quit();
 }
 
 bool
-ExecutionEnv::wait (void) {
+ExecutionEnv::wait () {
     if (_state != ExecutionEnv::COMPLETE) {
         if (_mainloop) {
             _mainloop = Glib::MainLoop::create(false);
diff --git a/src/extension/execution-env.h b/src/extension/execution-env.h
index 5ae7beb42..1bafdf8a7 100644
--- a/src/extension/execution-env.h
+++ b/src/extension/execution-env.h
@@ -81,30 +81,30 @@ public:
                   Implementation::ImplementationDocumentCache * docCache = nullptr,
                   bool show_working = true,
                   bool show_errors = true);
-    virtual ~ExecutionEnv (void);
+    virtual ~ExecutionEnv ();
 
     /** \brief Starts the execution of the effect
         \return Returns whether the effect was executed to completion */
-    void run (void);
+    void run ();
     /** \brief Cancel the execution of the effect */
-    void cancel (void);
+    void cancel ();
     /** \brief Commit the changes to the document */
-    void commit (void);
+    void commit ();
     /** \brief Undoes what the effect completed. */
-    void undo (void);
+    void undo ();
     /** \brief Wait for the effect to complete if it hasn't. */
-    bool wait (void);
-    void reselect (void);
+    bool wait ();
+    void reselect ();
 
     /** \brief Return reference to working dialog (if any) */
-    Gtk::Dialog *get_working_dialog (void) { return _visibleDialog; };
+    Gtk::Dialog *get_working_dialog () { return _visibleDialog; };
 
 private:
-    void runComplete (void);
-    void createWorkingDialog (void);
+    void runComplete ();
+    void createWorkingDialog ();
     void workingCanceled (const int resp);
-    void genDocCache (void);
-    void killDocCache (void);
+    void genDocCache ();
+    void killDocCache ();
 };
 
 } }  /* namespace Inkscape, Extension */
diff --git a/src/extension/extension.cpp b/src/extension/extension.cpp
index 55b5f68fc..3c9861aee 100644
--- a/src/extension/extension.cpp
+++ b/src/extension/extension.cpp
@@ -133,7 +133,7 @@ Extension::Extension (Inkscape::XML::Node * in_repr, Implementation::Implementat
     than freeing it because it may (I wouldn't know why) be referenced
     in another place.
 */
-Extension::~Extension (void)
+Extension::~Extension ()
 {
 //    printf("Extension Destructor: %s\n", name);
     set_state(STATE_UNLOADED);
@@ -217,7 +217,7 @@ Extension::set_state (state_t in_state)
     \brief    A getter for the state variable.
 */
 Extension::state_t
-Extension::get_state (void)
+Extension::get_state ()
 {
     return _state;
 }
@@ -227,7 +227,7 @@ Extension::get_state (void)
     \brief   A quick function to test the state of the extension
 */
 bool
-Extension::loaded (void)
+Extension::loaded ()
 {
     return get_state() == STATE_LOADED;
 }
@@ -249,7 +249,7 @@ Extension::loaded (void)
     functionality of Inkscape to be available.
 */
 bool
-Extension::check (void)
+Extension::check ()
 {
     bool retval = true;
 
@@ -321,7 +321,7 @@ Extension::printFailure (Glib::ustring reason)
     \brief   A getter for the internal Repr, does not add a reference.
 */
 Inkscape::XML::Node *
-Extension::get_repr (void)
+Extension::get_repr ()
 {
     return repr;
 }
@@ -331,7 +331,7 @@ Extension::get_repr (void)
     \brief   Whether this extension should hide the "working, please wait" dialog
 */
 bool
-Extension::is_silent (void)
+Extension::is_silent ()
 {
     return silent;
 }
@@ -341,7 +341,7 @@ Extension::is_silent (void)
     \brief   Get the ID of this extension - not a copy don't delete!
 */
 gchar *
-Extension::get_id (void)
+Extension::get_id ()
 {
     return id;
 }
@@ -351,7 +351,7 @@ Extension::get_id (void)
     \brief   Get the name of this extension - not a copy don't delete!
 */
 gchar *
-Extension::get_name (void)
+Extension::get_name ()
 {
     return name;
 }
@@ -372,7 +372,7 @@ Extension::get_name (void)
     Running this function is irreversable.
 */
 void
-Extension::deactivate (void)
+Extension::deactivate ()
 {
     set_state(STATE_DEACTIVATED);
 
@@ -389,7 +389,7 @@ Extension::deactivate (void)
     \brief   Find out the status of the extension
 */
 bool
-Extension::deactivated (void)
+Extension::deactivated ()
 {
     return get_state() == STATE_DEACTIVATED;
 }
@@ -650,7 +650,7 @@ Extension::set_param_color (const gchar * name, guint32 color, SPDocument * doc,
 
 /** \brief A function to open the error log file. */
 void
-Extension::error_file_open (void)
+Extension::error_file_open ()
 {
     gchar * ext_error_file = Inkscape::IO::Resource::log_path(EXTENSION_ERROR_LOG_FILENAME);
     gchar * filename = g_filename_from_utf8( ext_error_file, -1, nullptr, nullptr, nullptr );
@@ -665,7 +665,7 @@ Extension::error_file_open (void)
 
 /** \brief A function to close the error log file. */
 void
-Extension::error_file_close (void)
+Extension::error_file_close ()
 {
     error_file.close();
 };
@@ -674,7 +674,7 @@ Extension::error_file_close (void)
 class AutoGUI : public Gtk::VBox {
 public:
     /** \brief  Create an AutoGUI object */
-    AutoGUI (void) : Gtk::VBox() {};
+    AutoGUI () : Gtk::VBox() {};
 
     /**
      * Adds a widget with a tool tip into the autogui.
@@ -754,7 +754,7 @@ Extension::paramListString (std::list <std::string> &retlist)
 /* Extension editor dialog stuff */
 
 Gtk::VBox *
-Extension::get_info_widget(void)
+Extension::get_info_widget()
 {
     Gtk::VBox * retval = Gtk::manage(new Gtk::VBox());
 
@@ -794,7 +794,7 @@ void Extension::add_val(Glib::ustring labelstr, Glib::ustring valuestr, Gtk::Gri
 }
 
 Gtk::VBox *
-Extension::get_help_widget(void)
+Extension::get_help_widget()
 {
     Gtk::VBox * retval = Gtk::manage(new Gtk::VBox());
 
@@ -814,7 +814,7 @@ Extension::get_help_widget(void)
 }
 
 Gtk::VBox *
-Extension::get_params_widget(void)
+Extension::get_params_widget()
 {
     Gtk::VBox * retval = Gtk::manage(new Gtk::VBox());
     Gtk::Widget * content = Gtk::manage(new Gtk::Label("Params"));
diff --git a/src/extension/extension.h b/src/extension/extension.h
index e927e1431..36e06939a 100644
--- a/src/extension/extension.h
+++ b/src/extension/extension.h
@@ -116,24 +116,24 @@ protected:
 public:
                   Extension    (Inkscape::XML::Node * in_repr,
                                 Implementation::Implementation * in_imp);
-    virtual      ~Extension    (void);
+    virtual      ~Extension    ();
 
     void          set_state    (state_t in_state);
-    state_t       get_state    (void);
-    bool          loaded       (void);
-    virtual bool  check        (void);
-    Inkscape::XML::Node *      get_repr     (void);
-    gchar *       get_id       (void);
-    gchar *       get_name     (void);
+    state_t       get_state    ();
+    bool          loaded       ();
+    virtual bool  check        ();
+    Inkscape::XML::Node *      get_repr     ();
+    gchar *       get_id       ();
+    gchar *       get_name     ();
     /** \brief  Gets the help string for this extension */
-    gchar const * get_help     (void) { return _help; }
-    bool          is_silent (void);
-    void          deactivate   (void);
-    bool          deactivated  (void);
+    gchar const * get_help     () { return _help; }
+    bool          is_silent ();
+    void          deactivate   ();
+    bool          deactivated  ();
     void          printFailure (Glib::ustring reason);
-    Implementation::Implementation * get_imp (void) { return imp; };
+    Implementation::Implementation * get_imp () { return imp; };
     void          set_execution_env (ExecutionEnv * env) { execution_env = env; };
-    ExecutionEnv *get_execution_env (void) { return execution_env; };
+    ExecutionEnv *get_execution_env () { return execution_env; };
 
 /* Parameter Stuff */
 private:
@@ -283,8 +283,8 @@ public:
 
     /* Error file handling */
 public:
-    static void      error_file_open  (void);
-    static void      error_file_close (void);
+    static void      error_file_open  ();
+    static void      error_file_close ();
 
 public:
     Gtk::Widget *    autogui (SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal = nullptr);
@@ -293,9 +293,9 @@ public:
 
     /* Extension editor dialog stuff */
 public:
-    Gtk::VBox *    get_info_widget(void);
-    Gtk::VBox *    get_help_widget(void);
-    Gtk::VBox *    get_params_widget(void);
+    Gtk::VBox *    get_info_widget();
+    Gtk::VBox *    get_help_widget();
+    Gtk::VBox *    get_params_widget();
 protected:
     inline static void add_val(Glib::ustring labelstr, Glib::ustring valuestr, Gtk::Grid * table, int * row);
 };
diff --git a/src/extension/implementation/script.cpp b/src/extension/implementation/script.cpp
index 72a015b57..f0a6ec7bf 100644
--- a/src/extension/implementation/script.cpp
+++ b/src/extension/implementation/script.cpp
@@ -70,7 +70,7 @@ namespace Implementation {
     This just keeps coming the events through so that we'll make the GUI
     update and look pretty.
 */
-void Script::pump_events (void) {
+void Script::pump_events () {
     while ( Gtk::Main::events_pending() ) {
         Gtk::Main::iteration();
     }
@@ -903,7 +903,7 @@ void Script::checkStderr (const Glib::ustring &data,
     return;
 }
 
-bool Script::cancelProcessing (void) {
+bool Script::cancelProcessing () {
     _canceled = true;
     _main_loop->quit();
     Glib::spawn_close_pid(_pid);
diff --git a/src/extension/implementation/script.h b/src/extension/implementation/script.h
index 22c15faa8..fba1df136 100644
--- a/src/extension/implementation/script.h
+++ b/src/extension/implementation/script.h
@@ -34,7 +34,7 @@ namespace Implementation {
 class Script : public Implementation {
 public:
 
-    Script(void);
+    Script();
     ~Script() override;
     bool load(Inkscape::Extension::Extension *module) override;
     void unload(Inkscape::Extension::Extension *module) override;
@@ -47,7 +47,7 @@ public:
     Gtk::Widget *prefs_output(Inkscape::Extension::Output *module) override;
     void save(Inkscape::Extension::Output *module, SPDocument *doc, gchar const *filename) override;
     void effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View *doc, ImplementationDocumentCache * docCache) override;
-    bool cancelProcessing (void) override;
+    bool cancelProcessing () override;
 
 private:
     bool _canceled;
@@ -96,7 +96,7 @@ private:
         bool isDead () { return _dead; }
         void init(int fd, Glib::RefPtr<Glib::MainLoop> main);
         bool read(Glib::IOCondition condition);
-        Glib::ustring string (void) { return _string; };
+        Glib::ustring string () { return _string; };
         bool toFile(const Glib::ustring &name);
     };
 
@@ -105,7 +105,7 @@ private:
                  const Glib::ustring &filein,
                  file_listener &fileout);
 
-    void pump_events(void);
+    void pump_events();
 
     /** \brief  A definition of an interpreter, which can be specified
         in the INX file, but we need to know what to call */
diff --git a/src/extension/implementation/xslt.cpp b/src/extension/implementation/xslt.cpp
index 9e4a45483..e3b63d0a3 100644
--- a/src/extension/implementation/xslt.cpp
+++ b/src/extension/implementation/xslt.cpp
@@ -45,7 +45,7 @@ namespace Implementation {
                variables.
 
 */
-XSLT::XSLT(void) :
+XSLT::XSLT() :
     Implementation(),
     _filename(""),
     _parsedDoc(nullptr),
diff --git a/src/extension/implementation/xslt.h b/src/extension/implementation/xslt.h
index 3e5e24a9b..eb24436ae 100644
--- a/src/extension/implementation/xslt.h
+++ b/src/extension/implementation/xslt.h
@@ -37,7 +37,7 @@ private:
 
     Glib::ustring solve_reldir(Inkscape::XML::Node *reprin);
 public:
-    XSLT (void);
+    XSLT ();
 
     bool load(Inkscape::Extension::Extension *module) override;
     void unload(Inkscape::Extension::Extension *module) override;
diff --git a/src/extension/init.h b/src/extension/init.h
index efe44bf47..d89ad6ddd 100644
--- a/src/extension/init.h
+++ b/src/extension/init.h
@@ -18,7 +18,7 @@
 namespace Inkscape {
 namespace Extension {
 
-void init (void);
+void init ();
 
 } } /* namespace Inkscape::Extension */
 
diff --git a/src/extension/input.cpp b/src/extension/input.cpp
index 3fb330998..a13b6c4ea 100644
--- a/src/extension/input.cpp
+++ b/src/extension/input.cpp
@@ -98,7 +98,7 @@ Input::Input (Inkscape::XML::Node * in_repr, Implementation::Implementation * in
     \return  None
     \brief   Destroys an Input extension
 */
-Input::~Input (void)
+Input::~Input ()
 {
     g_free(mimetype);
     g_free(extension);
@@ -117,7 +117,7 @@ Input::~Input (void)
     class' check function which also checks out the implementation.
 */
 bool
-Input::check (void)
+Input::check ()
 {
     if (extension == nullptr)
         return FALSE;
@@ -162,7 +162,7 @@ Input::open (const gchar *uri)
     \brief   Get the mime-type that describes this extension
 */
 gchar *
-Input::get_mimetype(void)
+Input::get_mimetype()
 {
     return mimetype;
 }
@@ -172,7 +172,7 @@ Input::get_mimetype(void)
     \brief   Get the filename extension for this extension
 */
 gchar *
-Input::get_extension(void)
+Input::get_extension()
 {
     return extension;
 }
@@ -182,7 +182,7 @@ Input::get_extension(void)
     \brief   Get the name of the filetype supported
 */
 gchar *
-Input::get_filetypename(void)
+Input::get_filetypename()
 {
     if (filetypename != nullptr)
         return filetypename;
@@ -195,7 +195,7 @@ Input::get_filetypename(void)
     \brief   Get the tooltip for more information on the filetype
 */
 gchar *
-Input::get_filetypetooltip(void)
+Input::get_filetypetooltip()
 {
     return filetypetooltip;
 }
diff --git a/src/extension/input.h b/src/extension/input.h
index c433272ca..6db5a98b9 100644
--- a/src/extension/input.h
+++ b/src/extension/input.h
@@ -45,13 +45,13 @@ public:
 
                   Input                (Inkscape::XML::Node * in_repr,
                                         Implementation::Implementation * in_imp);
-         ~Input                (void) override;
-    bool  check                (void) override;
+         ~Input                () override;
+    bool  check                () override;
     SPDocument *  open                 (gchar const *uri);
-    gchar *       get_mimetype         (void);
-    gchar *       get_extension        (void);
-    gchar *       get_filetypename     (void);
-    gchar *       get_filetypetooltip  (void);
+    gchar *       get_mimetype         ();
+    gchar *       get_extension        ();
+    gchar *       get_filetypename     ();
+    gchar *       get_filetypetooltip  ();
     bool          prefs                (gchar const *uri);
 };
 
diff --git a/src/extension/internal/bluredge.cpp b/src/extension/internal/bluredge.cpp
index 808023c7c..150dce195 100644
--- a/src/extension/internal/bluredge.cpp
+++ b/src/extension/internal/bluredge.cpp
@@ -125,7 +125,7 @@ BlurEdge::prefs_effect(Inkscape::Extension::Effect * module, Inkscape::UI::View:
 #include "clear-n_.h"
 
 void
-BlurEdge::init (void)
+BlurEdge::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/bluredge.h b/src/extension/internal/bluredge.h
index c30372d99..ceeace555 100644
--- a/src/extension/internal/bluredge.h
+++ b/src/extension/internal/bluredge.h
@@ -27,7 +27,7 @@ public:
     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);
+    static void init ();
 };
 
 }; /* namespace Internal */
diff --git a/src/extension/internal/cairo-png-out.cpp b/src/extension/internal/cairo-png-out.cpp
index c3261fdce..6ff8943e8 100644
--- a/src/extension/internal/cairo-png-out.cpp
+++ b/src/extension/internal/cairo-png-out.cpp
@@ -103,7 +103,7 @@ void CairoRendererOutput::save(Inkscape::Extension::Output * /*mod*/, SPDocument
 	describes the data.
 */
 void
-CairoRendererOutput::init (void)
+CairoRendererOutput::init ()
 {
 	Inkscape::Extension::build_from_mem(
 		"<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/cairo-ps-out.cpp b/src/extension/internal/cairo-ps-out.cpp
index 9815088de..16340fe2e 100644
--- a/src/extension/internal/cairo-ps-out.cpp
+++ b/src/extension/internal/cairo-ps-out.cpp
@@ -321,7 +321,7 @@ CairoEpsOutput::textToPath(Inkscape::Extension::Print * ext)
 	describes the data.
 */
 void
-CairoPsOutput::init (void)
+CairoPsOutput::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
@@ -363,7 +363,7 @@ CairoPsOutput::init (void)
 	describes the data.
 */
 void
-CairoEpsOutput::init (void)
+CairoEpsOutput::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/cairo-render-context.cpp b/src/extension/internal/cairo-render-context.cpp
index 969fff4f9..d420f5c2a 100644
--- a/src/extension/internal/cairo-render-context.cpp
+++ b/src/extension/internal/cairo-render-context.cpp
@@ -135,7 +135,7 @@ CairoRenderContext::CairoRenderContext(CairoRenderer *parent) :
 {
 }
 
-CairoRenderContext::~CairoRenderContext(void)
+CairoRenderContext::~CairoRenderContext()
 {
     for (std::map<gpointer, cairo_font_face_t *>::const_iterator iter = font_table.begin(); iter != font_table.end(); ++iter)
         font_data_free(iter->second);
@@ -152,17 +152,17 @@ void CairoRenderContext::font_data_free(gpointer data)
     }
 }
 
-CairoRenderer* CairoRenderContext::getRenderer(void) const
+CairoRenderer* CairoRenderContext::getRenderer() const
 {
     return _renderer;
 }
 
-CairoRenderState* CairoRenderContext::getCurrentState(void) const
+CairoRenderState* CairoRenderContext::getCurrentState() const
 {
     return _state;
 }
 
-CairoRenderState* CairoRenderContext::getParentState(void) const
+CairoRenderState* CairoRenderContext::getParentState() const
 {
     // if this is the root node just return it
     if (_state_stack.size() == 1) {
@@ -213,7 +213,7 @@ CairoRenderContext::cloneMe(double width, double height) const
     return new_context;
 }
 
-CairoRenderContext* CairoRenderContext::cloneMe(void) const
+CairoRenderContext* CairoRenderContext::cloneMe() const
 {
     g_assert( _is_valid );
 
@@ -416,7 +416,7 @@ void CairoRenderContext::setEPS(bool eps)
     _eps = eps;
 }
 
-unsigned int CairoRenderContext::getPSLevel(void)
+unsigned int CairoRenderContext::getPSLevel()
 {
     return _ps_level;
 }
@@ -436,7 +436,7 @@ void CairoRenderContext::setOmitText(bool omittext)
     _is_omittext = omittext;
 }
 
-bool CairoRenderContext::getOmitText(void)
+bool CairoRenderContext::getOmitText()
 {
     return _is_omittext;
 }
@@ -446,7 +446,7 @@ void CairoRenderContext::setFilterToBitmap(bool filtertobitmap)
     _is_filtertobitmap = filtertobitmap;
 }
 
-bool CairoRenderContext::getFilterToBitmap(void)
+bool CairoRenderContext::getFilterToBitmap()
 {
     return _is_filtertobitmap;
 }
@@ -456,13 +456,13 @@ void CairoRenderContext::setBitmapResolution(int resolution)
     _bitmapresolution = resolution;
 }
 
-int CairoRenderContext::getBitmapResolution(void)
+int CairoRenderContext::getBitmapResolution()
 {
     return _bitmapresolution;
 }
 
 cairo_surface_t*
-CairoRenderContext::getSurface(void)
+CairoRenderContext::getSurface()
 {
     g_assert( _is_valid );
 
@@ -494,7 +494,7 @@ CairoRenderContext::setRenderMode(CairoRenderMode mode)
 }
 
 CairoRenderContext::CairoRenderMode
-CairoRenderContext::getRenderMode(void) const
+CairoRenderContext::getRenderMode() const
 {
     return _render_mode;
 }
@@ -514,12 +514,12 @@ CairoRenderContext::setClipMode(CairoClipMode mode)
 }
 
 CairoRenderContext::CairoClipMode
-CairoRenderContext::getClipMode(void) const
+CairoRenderContext::getClipMode() const
 {
     return _clip_mode;
 }
 
-CairoRenderState* CairoRenderContext::_createState(void)
+CairoRenderState* CairoRenderContext::_createState()
 {
     CairoRenderState *state = static_cast<CairoRenderState*>(g_try_malloc(sizeof(CairoRenderState)));
     g_assert( state != nullptr );
@@ -536,7 +536,7 @@ CairoRenderState* CairoRenderContext::_createState(void)
     return state;
 }
 
-void CairoRenderContext::pushLayer(void)
+void CairoRenderContext::pushLayer()
 {
     g_assert( _is_valid );
 
@@ -553,7 +553,7 @@ void CairoRenderContext::pushLayer(void)
 }
 
 void
-CairoRenderContext::popLayer(void)
+CairoRenderContext::popLayer()
 {
     g_assert( _is_valid );
 
@@ -1007,7 +1007,7 @@ Geom::Affine CairoRenderContext::getParentTransform() const
     return parent_state->transform;
 }
 
-void CairoRenderContext::pushState(void)
+void CairoRenderContext::pushState()
 {
     g_assert( _is_valid );
 
@@ -1020,7 +1020,7 @@ void CairoRenderContext::pushState(void)
     _state = new_state;
 }
 
-void CairoRenderContext::popState(void)
+void CairoRenderContext::popState()
 {
     g_assert( _is_valid );
 
diff --git a/src/extension/internal/cairo-render-context.h b/src/extension/internal/cairo-render-context.h
index 2cefb297d..d58c78c73 100644
--- a/src/extension/internal/cairo-render-context.h
+++ b/src/extension/internal/cairo-render-context.h
@@ -70,12 +70,12 @@ struct CairoRenderState {
 class CairoRenderContext {
     friend class CairoRenderer;
 public:
-    CairoRenderContext *cloneMe(void) const;
+    CairoRenderContext *cloneMe() const;
     CairoRenderContext *cloneMe(double width, double height) const;
     bool finish(bool finish_surface = true);
 
-    CairoRenderer *getRenderer(void) const;
-    cairo_t *getCairoContext(void) const;
+    CairoRenderer *getRenderer() const;
+    cairo_t *getCairoContext() const;
 
     enum CairoRenderMode {
         RENDER_MODE_NORMAL,
@@ -95,47 +95,47 @@ public:
 
     void setPSLevel(unsigned int level);
     void setEPS(bool eps);
-    unsigned int getPSLevel(void);
+    unsigned int getPSLevel();
     void setPDFLevel(unsigned int level);
     void setTextToPath(bool texttopath);
-    bool getTextToPath(void);
+    bool getTextToPath();
     void setOmitText(bool omittext);
-    bool getOmitText(void);
+    bool getOmitText();
     void setFilterToBitmap(bool filtertobitmap);
-    bool getFilterToBitmap(void);
+    bool getFilterToBitmap();
     void setBitmapResolution(int resolution);
-    int getBitmapResolution(void);
+    int getBitmapResolution();
 
     /** Creates the cairo_surface_t for the context with the
     given width, height and with the currently set target
     surface type. */
     bool setupSurface(double width, double height);
 
-    cairo_surface_t *getSurface(void);
+    cairo_surface_t *getSurface();
 
     /** Saves the contents of the context to a PNG file. */
     bool saveAsPng(const char *file_name);
 
     /** On targets supporting multiple pages, sends subsequent rendering to a new page*/
-    void newPage(void);
+    void newPage();
 
     /* Render/clip mode setting/query */
     void setRenderMode(CairoRenderMode mode);
-    CairoRenderMode getRenderMode(void) const;
+    CairoRenderMode getRenderMode() const;
     void setClipMode(CairoClipMode mode);
-    CairoClipMode getClipMode(void) const;
+    CairoClipMode getClipMode() const;
 
     void addPathVector(Geom::PathVector const &pv);
     void setPathVector(Geom::PathVector const &pv);
 
-    void pushLayer(void);
-    void popLayer(void);
+    void pushLayer();
+    void popLayer();
 
     /* Graphics state manipulation */
-    void pushState(void);
-    void popState(void);
-    CairoRenderState *getCurrentState(void) const;
-    CairoRenderState *getParentState(void) const;
+    void pushState();
+    void popState();
+    CairoRenderState *getCurrentState() const;
+    CairoRenderState *getParentState() const;
     void setStateForStyle(SPStyle const *style);
 
     void transform(Geom::Affine const &transform);
@@ -165,7 +165,7 @@ public:
 
 protected:
     CairoRenderContext(CairoRenderer *renderer);
-    virtual ~CairoRenderContext(void);
+    virtual ~CairoRenderContext();
 
     enum CairoOmitTextPageState {
         EMPTY,
@@ -223,13 +223,13 @@ protected:
     void _concatTransform(cairo_t *cr, double xx, double yx, double xy, double yy, double x0, double y0);
     void _concatTransform(cairo_t *cr, Geom::Affine const &transform);
 
-    void _prepareRenderGraphic(void);
-    void _prepareRenderText(void);
+    void _prepareRenderGraphic();
+    void _prepareRenderText();
 
     std::map<gpointer, cairo_font_face_t *> font_table;
     static void font_data_free(gpointer data);
 
-    CairoRenderState *_createState(void);
+    CairoRenderState *_createState();
 };
 
 }  /* namespace Internal */
diff --git a/src/extension/internal/cairo-renderer-pdf-out.cpp b/src/extension/internal/cairo-renderer-pdf-out.cpp
index 333c0eb42..3ad891ed1 100644
--- a/src/extension/internal/cairo-renderer-pdf-out.cpp
+++ b/src/extension/internal/cairo-renderer-pdf-out.cpp
@@ -238,7 +238,7 @@ CairoRendererPdfOutput::save(Inkscape::Extension::Output *mod, SPDocument *doc,
 	describes the data.
 */
 void
-CairoRendererPdfOutput::init (void)
+CairoRendererPdfOutput::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/cairo-renderer.cpp b/src/extension/internal/cairo-renderer.cpp
index c06119391..b21505431 100644
--- a/src/extension/internal/cairo-renderer.cpp
+++ b/src/extension/internal/cairo-renderer.cpp
@@ -103,7 +103,7 @@ namespace Internal {
 CairoRenderer::CairoRenderer(void)
 = default;
 
-CairoRenderer::~CairoRenderer(void)
+CairoRenderer::~CairoRenderer()
 {
     /* restore default signal handling for SIGPIPE */
 #if !defined(_WIN32) && !defined(__WIN32__)
@@ -114,7 +114,7 @@ CairoRenderer::~CairoRenderer(void)
 }
 
 CairoRenderContext*
-CairoRenderer::createContext(void)
+CairoRenderer::createContext()
 {
     CairoRenderContext *new_context = new CairoRenderContext(this);
     g_assert( new_context != nullptr );
diff --git a/src/extension/internal/cairo-renderer.h b/src/extension/internal/cairo-renderer.h
index b069e5bfe..03ffe2a1c 100644
--- a/src/extension/internal/cairo-renderer.h
+++ b/src/extension/internal/cairo-renderer.h
@@ -39,10 +39,10 @@ class CairoRenderContext;
 
 class CairoRenderer {
 public:
-    CairoRenderer(void);
-    virtual ~CairoRenderer(void);
+    CairoRenderer();
+    virtual ~CairoRenderer();
     
-    CairoRenderContext *createContext(void);
+    CairoRenderContext *createContext();
     void destroyContext(CairoRenderContext *ctx);
 
     void setStateForItem(CairoRenderContext *ctx, SPItem const *item);
diff --git a/src/extension/internal/cdr-input.cpp b/src/extension/internal/cdr-input.cpp
index 5f42c1a94..7848927ca 100644
--- a/src/extension/internal/cdr-input.cpp
+++ b/src/extension/internal/cdr-input.cpp
@@ -304,7 +304,7 @@ SPDocument *CdrInput::open(Inkscape::Extension::Input * /*mod*/, const gchar * u
 
 #include "clear-n_.h"
 
-void CdrInput::init(void)
+void CdrInput::init()
 {
     /* CDR */
      Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/cdr-input.h b/src/extension/internal/cdr-input.h
index 25b9e8425..a0fc69cd6 100644
--- a/src/extension/internal/cdr-input.h
+++ b/src/extension/internal/cdr-input.h
@@ -32,7 +32,7 @@ class CdrInput : public Inkscape::Extension::Implementation::Implementation {
 public:
      SPDocument *open( Inkscape::Extension::Input *mod,
                        const gchar *uri ) override;
-     static void         init( void );
+     static void         init( );
 
 };
 
diff --git a/src/extension/internal/emf-inout.cpp b/src/extension/internal/emf-inout.cpp
index e34d73cca..fa15f8eb5 100644
--- a/src/extension/internal/emf-inout.cpp
+++ b/src/extension/internal/emf-inout.cpp
@@ -65,13 +65,13 @@ static uint32_t ICMmode = 0;  // not used yet, but code to read it from EMF impl
 static uint32_t BLTmode = 0;
 float           faraway = 10000000; // used in "exclude" clips, hopefully well outside any real drawing!
 
-Emf::Emf (void) // The null constructor
+Emf::Emf () // The null constructor
 {
     return;
 }
 
 
-Emf::~Emf (void) //The destructor
+Emf::~Emf () //The destructor
 {
     return;
 }
@@ -3609,7 +3609,7 @@ Emf::open( Inkscape::Extension::Input * /*mod*/, const gchar *uri )
 
 
 void
-Emf::init (void)
+Emf::init ()
 {
     /* EMF in */
     Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/emf-inout.h b/src/extension/internal/emf-inout.h
index bef58b612..8c732404c 100644
--- a/src/extension/internal/emf-inout.h
+++ b/src/extension/internal/emf-inout.h
@@ -190,7 +190,7 @@ public:
     SPDocument *open( Inkscape::Extension::Input *mod,
                                 const gchar *uri ) override;
 
-    static void init(void);//Initialize the class
+    static void init();//Initialize the class
 
 private:
 
diff --git a/src/extension/internal/emf-print.cpp b/src/extension/internal/emf-print.cpp
index add2f0d37..9320e3ce9 100644
--- a/src/extension/internal/emf-print.cpp
+++ b/src/extension/internal/emf-print.cpp
@@ -2181,7 +2181,7 @@ unsigned int PrintEmf::text(Inkscape::Extension::Print * /*mod*/, char const *te
     return 0;
 }
 
-void PrintEmf::init(void)
+void PrintEmf::init()
 {
     _load_ppt_fontfix_data();
 
diff --git a/src/extension/internal/emf-print.h b/src/extension/internal/emf-print.h
index 43267dd2d..205db202e 100644
--- a/src/extension/internal/emf-print.h
+++ b/src/extension/internal/emf-print.h
@@ -64,7 +64,7 @@ public:
     unsigned int text(Inkscape::Extension::Print *module, char const *text,
                               Geom::Point const &p, SPStyle const *style) override;
 
-    static void init (void);
+    static void init ();
 protected:
     static void  smuggle_adxkyrtl_out(const char *string, uint32_t **adx, double *ky, int *rtl, int *ndx, float scale);
 
diff --git a/src/extension/internal/filter/bevels.h b/src/extension/internal/filter/bevels.h
index 4c2ddc719..3670fc6c5 100644
--- a/src/extension/internal/filter/bevels.h
+++ b/src/extension/internal/filter/bevels.h
@@ -47,7 +47,7 @@ public:
     DiffuseLight ( ) : Filter() { };
     ~DiffuseLight ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Diffuse Light") "</name>\n"
@@ -127,7 +127,7 @@ public:
     MatteJelly ( ) : Filter() { };
     ~MatteJelly ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Matte Jelly") "</name>\n"
@@ -211,7 +211,7 @@ public:
     SpecularLight ( ) : Filter() { };
     ~SpecularLight ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Specular Light") "</name>\n"
diff --git a/src/extension/internal/filter/blurs.h b/src/extension/internal/filter/blurs.h
index c99b9efac..ac87bc539 100644
--- a/src/extension/internal/filter/blurs.h
+++ b/src/extension/internal/filter/blurs.h
@@ -48,7 +48,7 @@ public:
     Blur ( ) : Filter() { };
     ~Blur ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Blur") "</name>\n"
@@ -119,7 +119,7 @@ public:
     CleanEdges ( ) : Filter() { };
     ~CleanEdges ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Clean Edges") "</name>\n"
@@ -179,7 +179,7 @@ public:
     CrossBlur ( ) : Filter() { };
     ~CrossBlur ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Cross Blur") "</name>\n"
@@ -254,7 +254,7 @@ public:
     Feather ( ) : Filter() { };
     ~Feather ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Feather") "</name>\n"
@@ -319,7 +319,7 @@ public:
     ImageBlur ( ) : Filter() { };
     ~ImageBlur ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Out of Focus") "</name>\n"
diff --git a/src/extension/internal/filter/bumps.h b/src/extension/internal/filter/bumps.h
index 0eaee7a5f..b8e887c26 100644
--- a/src/extension/internal/filter/bumps.h
+++ b/src/extension/internal/filter/bumps.h
@@ -74,7 +74,7 @@ public:
     Bump ( ) : Filter() { };
     ~Bump ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Bump") "</name>\n"
@@ -303,7 +303,7 @@ public:
     WaxBump ( ) : Filter() { };
     ~WaxBump ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Wax Bump") "</name>\n"
diff --git a/src/extension/internal/filter/color.h b/src/extension/internal/filter/color.h
index ae6bc718c..fc1948853 100644
--- a/src/extension/internal/filter/color.h
+++ b/src/extension/internal/filter/color.h
@@ -68,7 +68,7 @@ public:
     Brilliance ( ) : Filter() { };
     ~Brilliance ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Brilliance") "</name>\n"
@@ -148,7 +148,7 @@ public:
     ChannelPaint ( ) : Filter() { };
     ~ChannelPaint ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
     
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Channel Painting") "</name>\n"
@@ -249,7 +249,7 @@ public:
     ColorBlindness ( ) : Filter() { };
     ~ColorBlindness ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
     
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Color Blindness") "</name>\n"
@@ -324,7 +324,7 @@ public:
     ColorShift ( ) : Filter() { };
     ~ColorShift ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Color Shift") "</name>\n"
@@ -387,7 +387,7 @@ public:
     Colorize ( ) : Filter() { };
     ~Colorize ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
                 "<name>" N_("Colorize") "</name>\n"
@@ -494,7 +494,7 @@ public:
     ComponentTransfer ( ) : Filter() { };
     ~ComponentTransfer ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Component Transfer") "</name>\n"
@@ -579,7 +579,7 @@ public:
     Duochrome ( ) : Filter() { };
     ~Duochrome ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Duochrome") "</name>\n"
@@ -704,7 +704,7 @@ public:
     ExtractChannel ( ) : Filter() { };
     ~ExtractChannel ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Extract Channel") "</name>\n"
@@ -810,7 +810,7 @@ public:
     FadeToBW ( ) : Filter() { };
     ~FadeToBW ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Fade to Black or White") "</name>\n"
@@ -889,7 +889,7 @@ public:
     Greyscale ( ) : Filter() { };
     ~Greyscale ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Greyscale") "</name>\n"
@@ -975,7 +975,7 @@ public:
     Invert ( ) : Filter() { };
     ~Invert ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Invert") "</name>\n"
@@ -1110,7 +1110,7 @@ public:
     Lighting ( ) : Filter() { };
     ~Lighting ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Lighting") "</name>\n"
@@ -1181,7 +1181,7 @@ public:
     LightnessContrast ( ) : Filter() { };
     ~LightnessContrast ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Lightness-Contrast") "</name>\n"
@@ -1260,7 +1260,7 @@ public:
     NudgeRGB ( ) : Filter() { };
     ~NudgeRGB ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Nudge RGB") "</name>\n"
@@ -1372,7 +1372,7 @@ public:
     NudgeCMY ( ) : Filter() { };
     ~NudgeCMY ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Nudge CMY") "</name>\n"
@@ -1478,7 +1478,7 @@ public:
     Quadritone ( ) : Filter() { };
     ~Quadritone ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Quadritone Fantasy") "</name>\n"
@@ -1561,7 +1561,7 @@ public:
     SimpleBlend ( ) : Filter() { };
     ~SimpleBlend ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
     
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Simple blend") "</name>\n"
@@ -1647,7 +1647,7 @@ public:
     Solarize ( ) : Filter() { };
     ~Solarize ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Solarize") "</name>\n"
@@ -1734,7 +1734,7 @@ public:
     Tritone ( ) : Filter() { };
     ~Tritone ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Tritone") "</name>\n"
diff --git a/src/extension/internal/filter/distort.h b/src/extension/internal/filter/distort.h
index f1654d075..f677e334a 100644
--- a/src/extension/internal/filter/distort.h
+++ b/src/extension/internal/filter/distort.h
@@ -61,7 +61,7 @@ public:
     FeltFeather ( ) : Filter() { };
     ~FeltFeather ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Felt Feather") "</name>\n"
@@ -184,7 +184,7 @@ public:
     Roughen ( ) : Filter() { };
     ~Roughen ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Roughen") "</name>\n"
diff --git a/src/extension/internal/filter/filter-all.cpp b/src/extension/internal/filter/filter-all.cpp
index 83da6ea2b..3f1d2fb97 100644
--- a/src/extension/internal/filter/filter-all.cpp
+++ b/src/extension/internal/filter/filter-all.cpp
@@ -29,7 +29,7 @@ namespace Filter {
 
 
 void
-Filter::filters_all (void )
+Filter::filters_all ( )
 {
 	// Here come the filters which are coded in C++ in order to present a parameters dialog
 
diff --git a/src/extension/internal/filter/filter-file.cpp b/src/extension/internal/filter/filter-file.cpp
index 241f0f52c..023643deb 100644
--- a/src/extension/internal/filter/filter-file.cpp
+++ b/src/extension/internal/filter/filter-file.cpp
@@ -62,7 +62,7 @@ filters_load_file (Glib::ustring filename, gchar * menuname)
 	return;
 }
 
-void Filter::filters_all_files(void)
+void Filter::filters_all_files()
 {
     for(auto &filename: get_filenames(USER, FILTERS, {".svg"})) {
         filters_load_file(filename, _("Personal"));
@@ -78,14 +78,14 @@ void Filter::filters_all_files(void)
 class mywriter : public Inkscape::IO::BasicWriter {
 	Glib::ustring _str;
 public:
-	void close(void) override;
-	void flush(void) override;
+	void close() override;
+	void flush() override;
 	void put (gunichar ch) override;
-	gchar const * c_str (void) { return _str.c_str(); }
+	gchar const * c_str () { return _str.c_str(); }
 };
 
-void mywriter::close (void) { return; }
-void mywriter::flush (void) { return; }
+void mywriter::close () { return; }
+void mywriter::flush () { return; }
 void mywriter::put (gunichar ch) { _str += ch; }
 
 
diff --git a/src/extension/internal/filter/filter.cpp b/src/extension/internal/filter/filter.cpp
index 8e32bc05d..b869561cd 100644
--- a/src/extension/internal/filter/filter.cpp
+++ b/src/extension/internal/filter/filter.cpp
@@ -37,7 +37,7 @@ Filter::Filter(gchar const * filter) :
 	return;
 }
 
-Filter::~Filter (void) {
+Filter::~Filter () {
 	if (_filter != nullptr) {
 		_filter = nullptr;
 	}
diff --git a/src/extension/internal/filter/filter.h b/src/extension/internal/filter/filter.h
index 3a5b8a811..ba9f63d04 100644
--- a/src/extension/internal/filter/filter.h
+++ b/src/extension/internal/filter/filter.h
@@ -49,10 +49,10 @@ public:
 	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);
+	static void filters_all();
 
 	/* File loader related */
-	static void filters_all_files(void);
+	static void filters_all_files();
 	static void filters_load_node(Inkscape::XML::Node * node, gchar * menuname);
 
 };
diff --git a/src/extension/internal/filter/image.h b/src/extension/internal/filter/image.h
index 592e41b9f..2c715768c 100644
--- a/src/extension/internal/filter/image.h
+++ b/src/extension/internal/filter/image.h
@@ -43,7 +43,7 @@ public:
     EdgeDetect ( ) : Filter() { };
     ~EdgeDetect ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Edge Detect") "</name>\n"
diff --git a/src/extension/internal/filter/morphology.h b/src/extension/internal/filter/morphology.h
index 905e71e67..49df9c2a6 100644
--- a/src/extension/internal/filter/morphology.h
+++ b/src/extension/internal/filter/morphology.h
@@ -52,7 +52,7 @@ public:
     Crosssmooth ( ) : Filter() { };
     ~Crosssmooth ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Cross-smooth") "</name>\n"
@@ -160,7 +160,7 @@ public:
     Outline ( ) : Filter() { };
     ~Outline ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Outline") "</name>\n"
diff --git a/src/extension/internal/filter/overlays.h b/src/extension/internal/filter/overlays.h
index e0f78be9c..b451ec65d 100644
--- a/src/extension/internal/filter/overlays.h
+++ b/src/extension/internal/filter/overlays.h
@@ -50,7 +50,7 @@ public:
     NoiseFill ( ) : Filter() { };
     ~NoiseFill ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Noise Fill") "</name>\n"
diff --git a/src/extension/internal/filter/paint.h b/src/extension/internal/filter/paint.h
index aae71fcf3..afa3b5b12 100644
--- a/src/extension/internal/filter/paint.h
+++ b/src/extension/internal/filter/paint.h
@@ -65,7 +65,7 @@ public:
     Chromolitho ( ) : Filter() { };
     ~Chromolitho ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Chromolitho") "</name>\n"
@@ -226,7 +226,7 @@ public:
     CrossEngraving ( ) : Filter() { };
     ~CrossEngraving ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Cross Engraving") "</name>\n"
@@ -325,7 +325,7 @@ public:
     Drawing ( ) : Filter() { };
     ~Drawing ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Drawing") "</name>\n"
@@ -488,7 +488,7 @@ public:
     Electrize ( ) : Filter() { };
     ~Electrize ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Electrize") "</name>\n"
@@ -578,7 +578,7 @@ public:
     NeonDraw ( ) : Filter() { };
     ~NeonDraw ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Neon Draw") "</name>\n"
@@ -681,7 +681,7 @@ public:
     PointEngraving ( ) : Filter() { };
     ~PointEngraving ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Point Engraving") "</name>\n"
@@ -844,7 +844,7 @@ public:
     Posterize ( ) : Filter() { };
     ~Posterize ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Poster Paint") "</name>\n"
@@ -967,7 +967,7 @@ public:
     PosterizeBasic ( ) : Filter() { };
     ~PosterizeBasic ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Posterize Basic") "</name>\n"
diff --git a/src/extension/internal/filter/protrusions.h b/src/extension/internal/filter/protrusions.h
index 0abac91e7..8df7924ca 100644
--- a/src/extension/internal/filter/protrusions.h
+++ b/src/extension/internal/filter/protrusions.h
@@ -42,7 +42,7 @@ public:
 	~Snow ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
 public:
-	static void init (void) {
+	static void init () {
 		Inkscape::Extension::build_from_mem(
 			"<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
 				"<name>" N_("Snow Crest") "</name>\n"
diff --git a/src/extension/internal/filter/shadows.h b/src/extension/internal/filter/shadows.h
index 19cfdaba7..18ee53158 100644
--- a/src/extension/internal/filter/shadows.h
+++ b/src/extension/internal/filter/shadows.h
@@ -51,7 +51,7 @@ public:
     ColorizableDropShadow ( ) : Filter() { };
     ~ColorizableDropShadow ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Drop Shadow") "</name>\n"
diff --git a/src/extension/internal/filter/textures.h b/src/extension/internal/filter/textures.h
index 3340643a5..d7108c552 100644
--- a/src/extension/internal/filter/textures.h
+++ b/src/extension/internal/filter/textures.h
@@ -56,7 +56,7 @@ public:
 	~InkBlot ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
 public:
-	static void init (void) {
+	static void init () {
 		Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
             "<name>" N_("Ink Blot") "</name>\n"
diff --git a/src/extension/internal/filter/transparency.h b/src/extension/internal/filter/transparency.h
index 1239c1fac..68388fc06 100644
--- a/src/extension/internal/filter/transparency.h
+++ b/src/extension/internal/filter/transparency.h
@@ -47,7 +47,7 @@ public:
     Blend ( ) : Filter() { };
     ~Blend ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Blend") "</name>\n"
@@ -124,7 +124,7 @@ public:
     ChannelTransparency ( ) : Filter() { };
     ~ChannelTransparency ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
     
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Channel Transparency") "</name>\n"
@@ -199,7 +199,7 @@ public:
     LightEraser ( ) : Filter() { };
     ~LightEraser ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
     
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Light Eraser") "</name>\n"
@@ -273,7 +273,7 @@ public:
     Opacity ( ) : Filter() { };
     ~Opacity ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
     
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Opacity") "</name>\n"
@@ -335,7 +335,7 @@ public:
     Silhouette ( ) : Filter() { };
     ~Silhouette ( ) override { if (_filter != nullptr) g_free((void *)_filter); return; }
 
-    static void init (void) {
+    static void init () {
         Inkscape::Extension::build_from_mem(
             "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
               "<name>" N_("Silhouette") "</name>\n"
diff --git a/src/extension/internal/gdkpixbuf-input.cpp b/src/extension/internal/gdkpixbuf-input.cpp
index ba90c747e..02ca5af1a 100644
--- a/src/extension/internal/gdkpixbuf-input.cpp
+++ b/src/extension/internal/gdkpixbuf-input.cpp
@@ -163,7 +163,7 @@ GdkpixbufInput::open(Inkscape::Extension::Input *mod, char const *uri)
 #include "clear-n_.h"
 
 void
-GdkpixbufInput::init(void)
+GdkpixbufInput::init()
 {
     static std::vector< Gdk::PixbufFormat > formatlist = Gdk::Pixbuf::get_formats();
     for (auto i: formatlist) {
diff --git a/src/extension/internal/gimpgrad.cpp b/src/extension/internal/gimpgrad.cpp
index 1323ca7bc..bb6748c9c 100644
--- a/src/extension/internal/gimpgrad.cpp
+++ b/src/extension/internal/gimpgrad.cpp
@@ -265,7 +265,7 @@ error:
 
 #include "clear-n_.h"
 
-void GimpGrad::init (void)
+void GimpGrad::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/grid.cpp b/src/extension/internal/grid.cpp
index 5347eaa86..9e05ecd29 100644
--- a/src/extension/internal/grid.cpp
+++ b/src/extension/internal/grid.cpp
@@ -151,7 +151,7 @@ public:
         return;
     };
 
-    void val_changed (void);
+    void val_changed ();
 }; /* class PrefAdjustment */
 
 /** \brief  A function to respond to the value_changed signal from the
@@ -161,7 +161,7 @@ public:
     it to the parameter.  Very simple, but yet beautiful.
 */
 void
-PrefAdjustment::val_changed (void)
+PrefAdjustment::val_changed ()
 {
     // std::cout << "Value Changed to: " << this->get_value() << std::endl;
     _ext->set_param_float(_pref, this->get_value());
@@ -191,7 +191,7 @@ Grid::prefs_effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View
 #include "clear-n_.h"
 
 void
-Grid::init (void)
+Grid::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/grid.h b/src/extension/internal/grid.h
index 7d25c7b20..950615ce2 100644
--- a/src/extension/internal/grid.h
+++ b/src/extension/internal/grid.h
@@ -27,7 +27,7 @@ public:
     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);
+    static void init ();
 };
 
 }; /* namespace Internal */
diff --git a/src/extension/internal/javafx-out.cpp b/src/extension/internal/javafx-out.cpp
index 0185e07cd..ad8fa855d 100644
--- a/src/extension/internal/javafx-out.cpp
+++ b/src/extension/internal/javafx-out.cpp
@@ -101,7 +101,7 @@ static double effective_opacity(const SPStyle *style)
 //# OUTPUT FORMATTING
 //########################################################################
 
-JavaFXOutput::JavaFXOutput(void) :
+JavaFXOutput::JavaFXOutput() :
     name(),
     outbuf(),
     foutbuf(),
diff --git a/src/extension/internal/javafx-out.h b/src/extension/internal/javafx-out.h
index f9d209b86..f6035f7c3 100644
--- a/src/extension/internal/javafx-out.h
+++ b/src/extension/internal/javafx-out.h
@@ -40,7 +40,7 @@ class JavaFXOutput : public Inkscape::Extension::Implementation::Implementation
 {
 
 public:
-    JavaFXOutput (void);
+    JavaFXOutput ();
     
     /**
      * Our internal String definition
@@ -62,7 +62,7 @@ public:
     /**
      * Inkscape runtime startup call.
      */
-	static void init(void);
+	static void init();
 	
     /**
      * Reset variables to initial state
diff --git a/src/extension/internal/latex-pstricks-out.cpp b/src/extension/internal/latex-pstricks-out.cpp
index e1da0bab6..9c509f7d0 100644
--- a/src/extension/internal/latex-pstricks-out.cpp
+++ b/src/extension/internal/latex-pstricks-out.cpp
@@ -28,12 +28,12 @@ namespace Inkscape {
 namespace Extension {
 namespace Internal {
 
-LatexOutput::LatexOutput (void) // The null constructor
+LatexOutput::LatexOutput () // The null constructor
 {
     return;
 }
 
-LatexOutput::~LatexOutput (void) //The destructor
+LatexOutput::~LatexOutput () //The destructor
 {
     return;
 }
@@ -87,7 +87,7 @@ void LatexOutput::save(Inkscape::Extension::Output * /*mod2*/, SPDocument *doc,
     describes the data.
 */
 void
-LatexOutput::init (void)
+LatexOutput::init ()
 {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/latex-pstricks-out.h b/src/extension/internal/latex-pstricks-out.h
index 842a52655..b34d5c321 100644
--- a/src/extension/internal/latex-pstricks-out.h
+++ b/src/extension/internal/latex-pstricks-out.h
@@ -30,7 +30,7 @@ public:
               SPDocument *doc,
               gchar const *filename) override;
 
-    static void init(void);//Initialize the class
+    static void init();//Initialize the class
 };
 
 } } }  /* namespace Inkscape, Extension, Implementation */
diff --git a/src/extension/internal/latex-pstricks.cpp b/src/extension/internal/latex-pstricks.cpp
index 226f915aa..1d09fff82 100644
--- a/src/extension/internal/latex-pstricks.cpp
+++ b/src/extension/internal/latex-pstricks.cpp
@@ -36,14 +36,14 @@ namespace Inkscape {
 namespace Extension {
 namespace Internal {
 
-PrintLatex::PrintLatex (void):
+PrintLatex::PrintLatex ():
     _width(0),
     _height(0),
     _stream(nullptr)
 {
 }
 
-PrintLatex::~PrintLatex (void)
+PrintLatex::~PrintLatex ()
 {
     if (_stream) fclose(_stream);
 
@@ -322,7 +322,7 @@ PrintLatex::textToPath(Inkscape::Extension::Print * ext)
 
 #include "clear-n_.h"
 
-void PrintLatex::init(void)
+void PrintLatex::init()
 {
     /* SVG in */
     Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/latex-pstricks.h b/src/extension/internal/latex-pstricks.h
index 9b9519c55..fe9472b68 100644
--- a/src/extension/internal/latex-pstricks.h
+++ b/src/extension/internal/latex-pstricks.h
@@ -37,8 +37,8 @@ class PrintLatex : public Inkscape::Extension::Implementation::Implementation {
     void print_2geomcurve(SVGOStringStream &os, Geom::Curve const & c );
 
 public:
-        PrintLatex (void);
-        ~PrintLatex (void) override;
+        PrintLatex ();
+        ~PrintLatex () override;
 
         /* Print functions */
         unsigned int setup (Inkscape::Extension::Print * module) override;
@@ -61,7 +61,7 @@ public:
         unsigned int comment(Inkscape::Extension::Print *module, const char * comment) override;
         bool textToPath (Inkscape::Extension::Print * ext) override;
 
-        static void init (void);
+        static void init ();
 };
 
 }  /* namespace Internal */
diff --git a/src/extension/internal/latex-text-renderer.cpp b/src/extension/internal/latex-text-renderer.cpp
index fe9e78bf2..f346a304a 100644
--- a/src/extension/internal/latex-text-renderer.cpp
+++ b/src/extension/internal/latex-text-renderer.cpp
@@ -111,7 +111,7 @@ LaTeXTextRenderer::LaTeXTextRenderer(bool pdflatex)
     push_transform(Geom::identity());
 }
 
-LaTeXTextRenderer::~LaTeXTextRenderer(void)
+LaTeXTextRenderer::~LaTeXTextRenderer()
 {
     if (_stream) {
         writePostamble();
@@ -633,7 +633,7 @@ LaTeXTextRenderer::renderItem(SPItem *item)
 }
 
 void
-LaTeXTextRenderer::writeGraphicPage(void) {
+LaTeXTextRenderer::writeGraphicPage() {
     Inkscape::SVGOStringStream os;
     os.setf(std::ios::fixed); // no scientific notation
 
diff --git a/src/extension/internal/metafile-inout.cpp b/src/extension/internal/metafile-inout.cpp
index b90af9529..42c17bbdc 100644
--- a/src/extension/internal/metafile-inout.cpp
+++ b/src/extension/internal/metafile-inout.cpp
@@ -274,7 +274,7 @@ uint32_t Metafile::sethexcolor(U_COLORREF color){
 Currently a random 3x4 blotch.
 Caller must free.
 */
-gchar *Metafile::bad_image_png(void){
+gchar *Metafile::bad_image_png(){
     gchar *gstring = g_strdup("iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAIAAAA7ljmRAAAAA3NCSVQICAjb4U/gAAAALElEQVQImQXBQQ2AMAAAsUJQMSWI2H8qME1yMshojwrvGB8XcHKvR1XtOTc/8HENumHCsOMAAAAASUVORK5CYII=");
     return(gstring);
 }
diff --git a/src/extension/internal/metafile-inout.h b/src/extension/internal/metafile-inout.h
index eaa8334ee..c3cda0954 100644
--- a/src/extension/internal/metafile-inout.h
+++ b/src/extension/internal/metafile-inout.h
@@ -70,7 +70,7 @@ protected:
     static pixel_t    *pixel_at (bitmap_t * bitmap, int x, int y);
     static void        my_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
     static void        toPNG(PMEMPNG accum, int width, int height, const char *px);
-    static gchar      *bad_image_png(void);
+    static gchar      *bad_image_png();
     static void        setViewBoxIfMissing(SPDocument *doc);
     static int         combine_ops_to_livarot(const int op);
 
diff --git a/src/extension/internal/odf.h b/src/extension/internal/odf.h
index 691d6e1f7..08520eb26 100644
--- a/src/extension/internal/odf.h
+++ b/src/extension/internal/odf.h
@@ -272,7 +272,7 @@ public:
 	        SPDocument *doc,
 	        gchar const *filename) override;
 
-    static void   init  (void);
+    static void   init  ();
 
 private:
 
diff --git a/src/extension/internal/pdfinput/pdf-input.cpp b/src/extension/internal/pdfinput/pdf-input.cpp
index d078b5a9b..bdda43279 100644
--- a/src/extension/internal/pdfinput/pdf-input.cpp
+++ b/src/extension/internal/pdfinput/pdf-input.cpp
@@ -945,7 +945,7 @@ PdfInput::open(::Inkscape::Extension::Input * /*mod*/, const gchar * uri) {
 
 #include "../clear-n_.h"
 
-void PdfInput::init(void) {
+void PdfInput::init() {
     /* PDF in */
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
diff --git a/src/extension/internal/pdfinput/pdf-input.h b/src/extension/internal/pdfinput/pdf-input.h
index 4cf1d01a0..ddcb8f222 100644
--- a/src/extension/internal/pdfinput/pdf-input.h
+++ b/src/extension/internal/pdfinput/pdf-input.h
@@ -136,7 +136,7 @@ class PdfInput: public Inkscape::Extension::Implementation::Implementation {
 public:
     SPDocument *open( Inkscape::Extension::Input *mod,
                                 const gchar *uri ) override;
-    static void         init( void );
+    static void         init( );
     bool wasCancelled() override;
 private:
     bool _cancelled;
diff --git a/src/extension/internal/pov-out.h b/src/extension/internal/pov-out.h
index f38027a4b..d4f7991e7 100644
--- a/src/extension/internal/pov-out.h
+++ b/src/extension/internal/pov-out.h
@@ -65,7 +65,7 @@ public:
     /**
      * Inkscape runtime startup call.
      */
-	static void init(void);
+	static void init();
 	
     /**
      * Reset variables to initial state
diff --git a/src/extension/internal/svg.cpp b/src/extension/internal/svg.cpp
index f4e28e7ed..189ef3c58 100644
--- a/src/extension/internal/svg.cpp
+++ b/src/extension/internal/svg.cpp
@@ -130,7 +130,7 @@ static void pruneProprietaryGarbage( Inkscape::XML::Node *repr )
     the end of each call.
 */
 void
-Svg::init(void)
+Svg::init()
 {
     /* SVG in */
     Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/svg.h b/src/extension/internal/svg.h
index a7b593d54..cba0ebf3d 100644
--- a/src/extension/internal/svg.h
+++ b/src/extension/internal/svg.h
@@ -29,7 +29,7 @@ public:
                                gchar const *filename ) override;
     SPDocument *open( Inkscape::Extension::Input *mod,
                                 const gchar *uri ) override;
-    static void         init( void );
+    static void         init( );
 
 };
 
diff --git a/src/extension/internal/svgz.cpp b/src/extension/internal/svgz.cpp
index be9440980..27992ba58 100644
--- a/src/extension/internal/svgz.cpp
+++ b/src/extension/internal/svgz.cpp
@@ -38,7 +38,7 @@ namespace Internal {
     the end of each call.
 */
 void
-Svgz::init(void)
+Svgz::init()
 {
     /* SVGZ in */
     Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/svgz.h b/src/extension/internal/svgz.h
index ba348f887..2b917968e 100644
--- a/src/extension/internal/svgz.h
+++ b/src/extension/internal/svgz.h
@@ -23,7 +23,7 @@ namespace Internal {
 
 class Svgz : public Svg {
 public:
-    static void init( void );
+    static void init( );
 };
 
 } } }  // namespace Inkscape, Extension, Implementation
diff --git a/src/extension/internal/vsd-input.cpp b/src/extension/internal/vsd-input.cpp
index 46aa0245c..a0b41a990 100644
--- a/src/extension/internal/vsd-input.cpp
+++ b/src/extension/internal/vsd-input.cpp
@@ -304,7 +304,7 @@ SPDocument *VsdInput::open(Inkscape::Extension::Input * /*mod*/, const gchar * u
 
 #include "clear-n_.h"
 
-void VsdInput::init(void)
+void VsdInput::init()
 {
     /* VSD */
      Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/vsd-input.h b/src/extension/internal/vsd-input.h
index 5d8daddb2..6a5c28e65 100644
--- a/src/extension/internal/vsd-input.h
+++ b/src/extension/internal/vsd-input.h
@@ -32,7 +32,7 @@ class VsdInput : public Inkscape::Extension::Implementation::Implementation {
 public:
      SPDocument *open( Inkscape::Extension::Input *mod,
                        const gchar *uri ) override;
-     static void         init( void );
+     static void         init( );
 
 };
 
diff --git a/src/extension/internal/wmf-inout.cpp b/src/extension/internal/wmf-inout.cpp
index bcc8aea85..b19ac8328 100644
--- a/src/extension/internal/wmf-inout.cpp
+++ b/src/extension/internal/wmf-inout.cpp
@@ -67,13 +67,13 @@ namespace Internal {
 static bool clipset = false;
 static uint32_t BLTmode=0;
 
-Wmf::Wmf (void) // The null constructor
+Wmf::Wmf () // The null constructor
 {
     return;
 }
 
 
-Wmf::~Wmf (void) //The destructor
+Wmf::~Wmf () //The destructor
 {
     return;
 }
@@ -3198,7 +3198,7 @@ Wmf::open( Inkscape::Extension::Input * /*mod*/, const gchar *uri )
 
 
 void
-Wmf::init (void)
+Wmf::init ()
 {
     /* WMF in */
     Inkscape::Extension::build_from_mem(
diff --git a/src/extension/internal/wmf-inout.h b/src/extension/internal/wmf-inout.h
index a9831a7c6..fbd7fff3a 100644
--- a/src/extension/internal/wmf-inout.h
+++ b/src/extension/internal/wmf-inout.h
@@ -183,7 +183,7 @@ public:
     SPDocument *open( Inkscape::Extension::Input *mod,
                                 const gchar *uri ) override;
 
-    static void init(void);//Initialize the class
+    static void init();//Initialize the class
 
 private:
 protected:
diff --git a/src/extension/internal/wmf-print.cpp b/src/extension/internal/wmf-print.cpp
index 6c431eba5..9318da939 100644
--- a/src/extension/internal/wmf-print.cpp
+++ b/src/extension/internal/wmf-print.cpp
@@ -1562,7 +1562,7 @@ unsigned int PrintWmf::text(Inkscape::Extension::Print * /*mod*/, char const *te
     return 0;
 }
 
-void PrintWmf::init(void)
+void PrintWmf::init()
 {
     _load_ppt_fontfix_data();
 
diff --git a/src/extension/internal/wmf-print.h b/src/extension/internal/wmf-print.h
index c271e3cf7..5f68b77c1 100644
--- a/src/extension/internal/wmf-print.h
+++ b/src/extension/internal/wmf-print.h
@@ -64,7 +64,7 @@ public:
     unsigned int text(Inkscape::Extension::Print *module, char const *text,
                               Geom::Point const &p, SPStyle const *style) override;
 
-    static void init (void);
+    static void init ();
 protected:
     static void  smuggle_adxky_out(const char *string, int16_t **adx, double *ky, int *rtl, int *ndx, float scale);
 
diff --git a/src/extension/internal/wpg-input.cpp b/src/extension/internal/wpg-input.cpp
index 6a790ed4c..a1c27e3e3 100644
--- a/src/extension/internal/wpg-input.cpp
+++ b/src/extension/internal/wpg-input.cpp
@@ -148,7 +148,7 @@ SPDocument *WpgInput::open(Inkscape::Extension::Input * /*mod*/, const gchar * u
 
 #include "clear-n_.h"
 
-void WpgInput::init(void) {
+void WpgInput::init() {
     Inkscape::Extension::build_from_mem(
         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
             "<name>" N_("WPG Input") "</name>\n"
diff --git a/src/extension/internal/wpg-input.h b/src/extension/internal/wpg-input.h
index 92404a9e7..f938a8d17 100644
--- a/src/extension/internal/wpg-input.h
+++ b/src/extension/internal/wpg-input.h
@@ -26,7 +26,7 @@ class WpgInput : public Inkscape::Extension::Implementation::Implementation {
 public:
     SPDocument *open( Inkscape::Extension::Input *mod,
                                 const gchar *uri ) override;
-    static void         init( void );
+    static void         init( );
 
 };
 
diff --git a/src/extension/loader.cpp b/src/extension/loader.cpp
index 9d8c52aea..fc9b7ee29 100644
--- a/src/extension/loader.cpp
+++ b/src/extension/loader.cpp
@@ -21,8 +21,8 @@
 namespace Inkscape {
 namespace Extension {
 
-typedef Implementation::Implementation *(*_getImplementation)(void);
-typedef const gchar *(*_getInkscapeVersion)(void);
+typedef Implementation::Implementation *(*_getImplementation)();
+typedef const gchar *(*_getInkscapeVersion)();
 
 bool Loader::load_dependency(Dependency *dep)
 {
diff --git a/src/extension/output.cpp b/src/extension/output.cpp
index d6f95c19a..5a39a2403 100644
--- a/src/extension/output.cpp
+++ b/src/extension/output.cpp
@@ -95,7 +95,7 @@ Output::Output (Inkscape::XML::Node * in_repr, Implementation::Implementation *
 /**
     \brief  Destroy an output extension
 */
-Output::~Output (void)
+Output::~Output ()
 {
     g_free(mimetype);
     g_free(extension);
@@ -113,7 +113,7 @@ Output::~Output (void)
 	class' check function which also checks out the implementation.
 */
 bool
-Output::check (void)
+Output::check ()
 {
 	if (extension == nullptr)
 		return FALSE;
@@ -128,7 +128,7 @@ Output::check (void)
 	\brief   Get the mime-type that describes this extension
 */
 gchar *
-Output::get_mimetype(void)
+Output::get_mimetype()
 {
     return mimetype;
 }
@@ -138,7 +138,7 @@ Output::get_mimetype(void)
 	\brief   Get the filename extension for this extension
 */
 gchar *
-Output::get_extension(void)
+Output::get_extension()
 {
     return extension;
 }
@@ -148,7 +148,7 @@ Output::get_extension(void)
 	\brief   Get the name of the filetype supported
 */
 gchar *
-Output::get_filetypename(void)
+Output::get_filetypename()
 {
     if (filetypename != nullptr)
         return filetypename;
@@ -161,7 +161,7 @@ Output::get_filetypename(void)
 	\brief   Get the tooltip for more information on the filetype
 */
 gchar *
-Output::get_filetypetooltip(void)
+Output::get_filetypetooltip()
 {
     return filetypetooltip;
 }
@@ -173,7 +173,7 @@ Output::get_filetypetooltip(void)
 	Calls the implementation to get the preferences.
 */
 bool
-Output::prefs (void)
+Output::prefs ()
 {
     if (!loaded())
         set_state(Extension::STATE_LOADED);
diff --git a/src/extension/output.h b/src/extension/output.h
index 4f2924852..de1ce4503 100644
--- a/src/extension/output.h
+++ b/src/extension/output.h
@@ -39,16 +39,16 @@ public:
 
                  Output (Inkscape::XML::Node * in_repr,
                          Implementation::Implementation * in_imp);
-        ~Output (void) override;
-    bool check                (void) override;
+        ~Output () override;
+    bool check                () override;
     void         save (SPDocument *doc,
                        gchar const *uri);
-    bool         prefs (void);
-    gchar *      get_mimetype(void);
-    gchar *      get_extension(void);
-    gchar *      get_filetypename(void);
-    gchar *      get_filetypetooltip(void);
-    bool         causes_dataloss(void) { return dataloss; };
+    bool         prefs ();
+    gchar *      get_mimetype();
+    gchar *      get_extension();
+    gchar *      get_filetypename();
+    gchar *      get_filetypetooltip();
+    bool         causes_dataloss() { return dataloss; };
 };
 
 } }  /* namespace Inkscape, Extension */
diff --git a/src/extension/param/bool.cpp b/src/extension/param/bool.cpp
index eea660f69..ac86e77b1 100644
--- a/src/extension/param/bool.cpp
+++ b/src/extension/param/bool.cpp
@@ -94,7 +94,7 @@ public:
      * A function to respond to the check box changing.
      * Adjusts the value of the preference to match that in the check box.
      */
-    void on_toggle (void);
+    void on_toggle ();
 
 private:
     /** Param to change. */
@@ -104,7 +104,7 @@ private:
     sigc::signal<void> * _changeSignal;
 };
 
-void ParamBoolCheckButton::on_toggle(void)
+void ParamBoolCheckButton::on_toggle()
 {
     _pref->set(this->get_active(), nullptr /**\todo fix this */, nullptr);
     if (_changeSignal != nullptr) {
diff --git a/src/extension/param/color.cpp b/src/extension/param/color.cpp
index 1e3b1dc4c..886f6ab49 100644
--- a/src/extension/param/color.cpp
+++ b/src/extension/param/color.cpp
@@ -30,7 +30,7 @@
 namespace Inkscape {
 namespace Extension {
 
-ParamColor::~ParamColor(void)
+ParamColor::~ParamColor()
 {
     _color_changed.disconnect();
 }
diff --git a/src/extension/param/color.h b/src/extension/param/color.h
index ed272ea2a..f3b44b412 100644
--- a/src/extension/param/color.h
+++ b/src/extension/param/color.h
@@ -38,7 +38,7 @@ public:
                int indent,
                Inkscape::Extension::Extension * ext,
                Inkscape::XML::Node * xml);
-    ~ParamColor(void) override;
+    ~ParamColor() override;
 
     /** Returns \c _value, with a \i const to protect it. */
     guint32 get( SPDocument const * /*doc*/, Inkscape::XML::Node const * /*node*/ ) const { return _color.value(); }
diff --git a/src/extension/param/enum.cpp b/src/extension/param/enum.cpp
index c5ee5f6b9..df4b22d0c 100644
--- a/src/extension/param/enum.cpp
+++ b/src/extension/param/enum.cpp
@@ -101,7 +101,7 @@ ParamComboBox::ParamComboBox(const gchar * name,
     }
 }
 
-ParamComboBox::~ParamComboBox (void)
+ParamComboBox::~ParamComboBox ()
 {
     //destroy choice strings
     for (auto i:choices) {
@@ -171,7 +171,7 @@ bool ParamComboBox::contains(const gchar * text, SPDocument const * /*doc*/, Ink
 }
 
 void
-ParamComboBox::changed (void) {
+ParamComboBox::changed () {
 
 }
 
@@ -200,7 +200,7 @@ public:
         Gtk::ComboBoxText(), _pref(pref), _doc(doc), _node(node), _changeSignal(changeSignal) {
         this->signal_changed().connect(sigc::mem_fun(this, &ParamComboBoxEntry::changed));
     };
-    void changed (void);
+    void changed ();
 };
 
 /**
@@ -210,7 +210,7 @@ public:
  * from the text box and putting it in the parameter.
  */
 void
-ParamComboBoxEntry::changed (void)
+ParamComboBoxEntry::changed ()
 {
     Glib::ustring data = this->get_active_text();
     _pref->set(data.c_str(), _doc, _node);
diff --git a/src/extension/param/enum.h b/src/extension/param/enum.h
index b60eacf0f..0c80bdcf6 100644
--- a/src/extension/param/enum.h
+++ b/src/extension/param/enum.h
@@ -60,7 +60,7 @@ public:
                   int indent,
                   Inkscape::Extension::Extension * ext,
                   Inkscape::XML::Node * xml);
-    ~ParamComboBox(void) override;
+    ~ParamComboBox() override;
 
     Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) override;
 
@@ -78,7 +78,7 @@ public:
      */
     bool contains(const gchar * text, SPDocument const * /*doc*/, Inkscape::XML::Node const * /*node*/) const;
 
-    void changed (void);
+    void changed ();
 }; /* class ParamComboBox */
 
 
diff --git a/src/extension/param/float.cpp b/src/extension/param/float.cpp
index aaf871068..bde96339a 100644
--- a/src/extension/param/float.cpp
+++ b/src/extension/param/float.cpp
@@ -141,7 +141,7 @@ public:
         return;
     };
 
-    void val_changed (void);
+    void val_changed ();
 }; /* class ParamFloatAdjustment */
 
 /**
@@ -150,7 +150,7 @@ public:
  * This function just grabs the value from the adjustment and writes
  * it to the parameter.  Very simple, but yet beautiful.
  */
-void ParamFloatAdjustment::val_changed(void)
+void ParamFloatAdjustment::val_changed()
 {
     //std::cout << "Value Changed to: " << this->get_value() << std::endl;
     _pref->set(this->get_value(), _doc, _node);
diff --git a/src/extension/param/float.h b/src/extension/param/float.h
index c7ac11c6f..ce92d8c28 100644
--- a/src/extension/param/float.h
+++ b/src/extension/param/float.h
@@ -43,11 +43,11 @@ public:
 
     float set (float in, SPDocument * doc, Inkscape::XML::Node * node);
 
-    float max (void) { return _max; }
+    float max () { return _max; }
 
-    float min (void) { return _min; }
+    float min () { return _min; }
 
-    float precision (void) { return _precision; }
+    float precision () { return _precision; }
 
     Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) override;
 
diff --git a/src/extension/param/int.cpp b/src/extension/param/int.cpp
index 1c946d8b8..2e0792081 100644
--- a/src/extension/param/int.cpp
+++ b/src/extension/param/int.cpp
@@ -122,7 +122,7 @@ public:
         this->signal_value_changed().connect(sigc::mem_fun(this, &ParamIntAdjustment::val_changed));
     };
 
-    void val_changed (void);
+    void val_changed ();
 }; /* class ParamIntAdjustment */
 
 /**
@@ -131,7 +131,7 @@ public:
  * This function just grabs the value from the adjustment and writes
  * it to the parameter.  Very simple, but yet beautiful.
  */
-void ParamIntAdjustment::val_changed(void)
+void ParamIntAdjustment::val_changed()
 {
     //std::cout << "Value Changed to: " << this->get_value() << std::endl;
     _pref->set((int)this->get_value(), _doc, _node);
diff --git a/src/extension/param/int.h b/src/extension/param/int.h
index 5b3cfb364..e6f4ac3db 100644
--- a/src/extension/param/int.h
+++ b/src/extension/param/int.h
@@ -43,9 +43,9 @@ public:
 
     int set (int in, SPDocument * doc, Inkscape::XML::Node * node);
 
-    int max (void) { return _max; }
+    int max () { return _max; }
 
-    int min (void) { return _min; }
+    int min () { return _min; }
 
     Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) override;
 
diff --git a/src/extension/param/notebook.cpp b/src/extension/param/notebook.cpp
index d00693db4..f948cc937 100644
--- a/src/extension/param/notebook.cpp
+++ b/src/extension/param/notebook.cpp
@@ -70,7 +70,7 @@ ParamNotebook::ParamNotebookPage::ParamNotebookPage(const gchar * name,
     }
 }
 
-ParamNotebook::ParamNotebookPage::~ParamNotebookPage (void)
+ParamNotebook::ParamNotebookPage::~ParamNotebookPage ()
 {
     //destroy parameters
     for (auto param:parameters) {
@@ -260,7 +260,7 @@ ParamNotebook::ParamNotebook(const gchar * name,
         _value = g_strdup(defaultval);  // allocate space for _value
 }
 
-ParamNotebook::~ParamNotebook (void)
+ParamNotebook::~ParamNotebook ()
 {
     //destroy pages
     for (auto page:pages) {
diff --git a/src/extension/param/notebook.h b/src/extension/param/notebook.h
index 52577dd48..1d676615b 100644
--- a/src/extension/param/notebook.h
+++ b/src/extension/param/notebook.h
@@ -55,11 +55,11 @@ private:
                       bool hidden,
                       Inkscape::Extension::Extension * ext,
                       Inkscape::XML::Node * xml);
-        ~ParamNotebookPage(void) override;
+        ~ParamNotebookPage() override;
 
         Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) override;
         void paramString (std::list <std::string> &list);
-        gchar * get_text (void) {return _text;};
+        gchar * get_text () {return _text;};
         Parameter * get_param (const gchar * name) override;
     }; /* class ParamNotebookPage */
 
@@ -75,7 +75,7 @@ public:
                   int indent,
                   Inkscape::Extension::Extension * ext,
                   Inkscape::XML::Node * xml);
-    ~ParamNotebook(void) override;
+    ~ParamNotebook() override;
 
     Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) override;
 
diff --git a/src/extension/param/parameter.cpp b/src/extension/param/parameter.cpp
index d897903cb..36c6838cd 100644
--- a/src/extension/param/parameter.cpp
+++ b/src/extension/param/parameter.cpp
@@ -348,7 +348,7 @@ Parameter::Parameter (gchar const * name, gchar const * text, Inkscape::Extensio
     return;
 }
 
-Parameter::~Parameter(void)
+Parameter::~Parameter()
 {
     g_free(_name);
     _name = nullptr;
@@ -360,7 +360,7 @@ Parameter::~Parameter(void)
     _description = nullptr;
 }
 
-gchar *Parameter::pref_name(void) const
+gchar *Parameter::pref_name() const
 {
     return g_strdup_printf("%s.%s", _extension->get_id(), _name);
 }
diff --git a/src/extension/param/parameter.h b/src/extension/param/parameter.h
index 829085cf6..cb6c84441 100644
--- a/src/extension/param/parameter.h
+++ b/src/extension/param/parameter.h
@@ -59,7 +59,7 @@ public:
               gchar const *text,
               Inkscape::Extension::Extension * ext);
 
-    virtual ~Parameter(void);
+    virtual ~Parameter();
 
     /** Wrapper to cast to the object and use its function. */
     bool get_bool(SPDocument const *doc, Inkscape::XML::Node const *node) const;
@@ -100,7 +100,7 @@ public:
 
     guint32 set_color(guint32 in, SPDocument * doc, Inkscape::XML::Node * node);
 
-    gchar const * name(void) const {return _name;}
+    gchar const * name() const {return _name;}
 
     /**
      * This function creates a parameter that can be used later.  This
@@ -130,7 +130,7 @@ public:
 
     virtual Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal);
 
-    gchar const * get_tooltip(void) const { return _description; }
+    gchar const * get_tooltip() const { return _description; }
 
     /** Indicates if the GUI for this parameter is hidden or not */
     bool get_hidden() const { return _hidden; }
@@ -181,7 +181,7 @@ protected:
     /**
      * Build the name to write the parameter from the extension's ID and the name of this parameter.
      */
-    gchar *pref_name(void) const;
+    gchar *pref_name() const;
 
     Inkscape::XML::Node * find_child (Inkscape::XML::Node * adult);
 
diff --git a/src/extension/param/radiobutton.cpp b/src/extension/param/radiobutton.cpp
index 4a479687b..428767cb0 100644
--- a/src/extension/param/radiobutton.cpp
+++ b/src/extension/param/radiobutton.cpp
@@ -116,7 +116,7 @@ ParamRadioButton::ParamRadioButton(const gchar * name,
     }
 }
 
-ParamRadioButton::~ParamRadioButton (void)
+ParamRadioButton::~ParamRadioButton ()
 {
     //destroy choice strings
     for(auto i:choices) {
@@ -200,7 +200,7 @@ public:
     void add_changesignal() {
         this->signal_toggled().connect(sigc::mem_fun(this, &ParamRadioButtonWdg::changed));
     };
-    void changed (void);
+    void changed ();
 };
 
 /**
@@ -209,7 +209,7 @@ public:
  * This function responds to the radiobutton selection changing by grabbing the value
  * from the text box and putting it in the parameter.
  */
-void ParamRadioButtonWdg::changed(void)
+void ParamRadioButtonWdg::changed()
 {
     if (this->get_active()) {
         Glib::ustring value = _pref->value_from_label(this->get_label());
@@ -238,10 +238,10 @@ public:
         this->signal_changed().connect(sigc::mem_fun(this, &ComboWdg::changed));
     }
     ~ComboWdg() override = default;
-    void changed (void);
+    void changed ();
 };
 
-void ComboWdg::changed(void)
+void ComboWdg::changed()
 {
     if ( _base ) {
             Glib::ustring value = _base->value_from_label(get_active_text());
diff --git a/src/extension/param/radiobutton.h b/src/extension/param/radiobutton.h
index b96defe10..5958be8a4 100644
--- a/src/extension/param/radiobutton.h
+++ b/src/extension/param/radiobutton.h
@@ -43,7 +43,7 @@ public:
                      Inkscape::Extension::Extension * ext,
                      Inkscape::XML::Node * xml,
                      AppearanceMode mode);
-    ~ParamRadioButton(void) override;
+    ~ParamRadioButton() override;
 
     Gtk::Widget * get_widget(SPDocument * doc, Inkscape::XML::Node * node, sigc::signal<void> * changeSignal) override;
 
diff --git a/src/extension/param/string.cpp b/src/extension/param/string.cpp
index 775bf62ee..59e21d77d 100644
--- a/src/extension/param/string.cpp
+++ b/src/extension/param/string.cpp
@@ -27,7 +27,7 @@ namespace Extension {
 
 
 /** Free the allocated data. */
-ParamString::~ParamString(void)
+ParamString::~ParamString()
 {
     g_free(_value);
     _value = nullptr;
@@ -136,7 +136,7 @@ public:
         this->set_max_length(_pref->getMaxLength()); //Set the max length - default zero means no maximum
         this->signal_changed().connect(sigc::mem_fun(this, &ParamStringEntry::changed_text));
     };
-    void changed_text (void);
+    void changed_text ();
 };
 
 
@@ -146,7 +146,7 @@ public:
  * This function responds to the box changing by grabbing the value
  * from the text box and putting it in the parameter.
  */
-void ParamStringEntry::changed_text(void)
+void ParamStringEntry::changed_text()
 {
     Glib::ustring data = this->get_text();
     _pref->set(data.c_str(), _doc, _node);
diff --git a/src/extension/param/string.h b/src/extension/param/string.h
index e911565fe..20bfd849c 100644
--- a/src/extension/param/string.h
+++ b/src/extension/param/string.h
@@ -30,7 +30,7 @@ public:
                 int indent,
                 Inkscape::Extension::Extension * ext,
                 Inkscape::XML::Node * xml);
-    ~ParamString(void) override;
+    ~ParamString() override;
 
     /** \brief  Returns \c _value, with a \i const to protect it. */
     const gchar *get(SPDocument const * /*doc*/, Inkscape::XML::Node const * /*node*/) const { return _value; }
@@ -45,7 +45,7 @@ public:
     void string(std::string &string) const override;
 
     void setMaxLength(int maxLenght) { _max_length = maxLenght; }
-    int getMaxLength(void) { return _max_length; }
+    int getMaxLength() { return _max_length; }
 };
 
 
diff --git a/src/extension/patheffect.h b/src/extension/patheffect.h
index a89651ae3..d9aea7f59 100644
--- a/src/extension/patheffect.h
+++ b/src/extension/patheffect.h
@@ -21,7 +21,7 @@ class PathEffect : public Extension {
 public:
                  PathEffect  (Inkscape::XML::Node * in_repr,
                               Implementation::Implementation * in_imp);
-        ~PathEffect  (void) override;
+        ~PathEffect  () override;
     void         processPath (SPDocument * doc,
                               Inkscape::XML::Node * path,
                               Inkscape::XML::Node * def);
diff --git a/src/extension/plugins/grid2/grid.cpp b/src/extension/plugins/grid2/grid.cpp
index 3ebe85b3e..91d9e3b2b 100644
--- a/src/extension/plugins/grid2/grid.cpp
+++ b/src/extension/plugins/grid2/grid.cpp
@@ -158,7 +158,7 @@ public:
         return;
     };
 
-    void val_changed (void);
+    void val_changed ();
 }; /* class PrefAdjustment */
 
 /** \brief  A function to respond to the value_changed signal from the
@@ -168,7 +168,7 @@ public:
     it to the parameter.  Very simple, but yet beautiful.
 */
 void
-PrefAdjustment::val_changed (void)
+PrefAdjustment::val_changed ()
 {
     // std::cout << "Value Changed to: " << this->get_value() << std::endl;
     _ext->set_param_float(_pref, this->get_value());
diff --git a/src/extension/prefdialog.cpp b/src/extension/prefdialog.cpp
index 47ed14405..94456b8d4 100644
--- a/src/extension/prefdialog.cpp
+++ b/src/extension/prefdialog.cpp
@@ -172,7 +172,7 @@ PrefDialog::run (void) {
 #endif
 
 void
-PrefDialog::preview_toggle (void) {
+PrefDialog::preview_toggle () {
     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
     SPDocument *document = SP_ACTIVE_DOCUMENT;
     bool modified = document->isModifiedSinceSave();
@@ -198,7 +198,7 @@ PrefDialog::preview_toggle (void) {
 }
 
 void
-PrefDialog::param_change (void) {
+PrefDialog::param_change () {
     if (_exEnv != nullptr) {
         if (!_effect->loaded()) {
             _effect->set_state(Extension::STATE_LOADED);
@@ -213,7 +213,7 @@ PrefDialog::param_change (void) {
 }
 
 bool
-PrefDialog::param_timer_expire (void) {
+PrefDialog::param_timer_expire () {
     if (_exEnv != nullptr) {
         _exEnv->cancel();
         _exEnv->undo();
diff --git a/src/extension/prefdialog.h b/src/extension/prefdialog.h
index f2ff60770..bc5742fd5 100644
--- a/src/extension/prefdialog.h
+++ b/src/extension/prefdialog.h
@@ -63,9 +63,9 @@ class PrefDialog : public Gtk::Dialog {
                 directly and allows for changes. */
     sigc::connection _timersig;
 
-    void preview_toggle(void);
-    void param_change(void);
-    bool param_timer_expire(void);
+    void preview_toggle();
+    void param_change();
+    bool param_timer_expire();
     void on_response (int signal) override;
 
 public:
diff --git a/src/extension/print.h b/src/extension/print.h
index 23a58b3fc..65719baf7 100644
--- a/src/extension/print.h
+++ b/src/extension/print.h
@@ -34,20 +34,20 @@ public: /* TODO: These are public for the short term, but this should be fixed *
 public:
                   Print       (Inkscape::XML::Node * in_repr,
                                Implementation::Implementation * in_imp);
-         ~Print       (void) override;
-    bool  check       (void) override;
+         ~Print       () override;
+    bool  check       () override;
 
     /* FALSE means user hit cancel */
-    unsigned int  setup       (void);
-    unsigned int  set_preview (void);
+    unsigned int  setup       ();
+    unsigned int  set_preview ();
 
     unsigned int  begin       (SPDocument *doc);
-    unsigned int  finish      (void);
+    unsigned int  finish      ();
 
     /* Rendering methods */
     unsigned int  bind        (Geom::Affine const &transform,
                                float opacity);
-    unsigned int  release     (void);
+    unsigned int  release     ();
     unsigned int  comment     (const char * comment);
     unsigned int  fill        (Geom::PathVector const &pathv,
                                Geom::Affine const &ctm,
@@ -70,8 +70,8 @@ public:
     unsigned int  text        (char const *text,
                                Geom::Point const &p,
                                SPStyle const *style);
-    bool          textToPath  (void);
-    bool          fontEmbedded  (void);
+    bool          textToPath  ();
+    bool          fontEmbedded  ();
 };
 
 } }  /* namespace Inkscape, Extension */
diff --git a/src/extension/timer.cpp b/src/extension/timer.cpp
index 5fb727409..867faf205 100644
--- a/src/extension/timer.cpp
+++ b/src/extension/timer.cpp
@@ -64,7 +64,7 @@ ExpirationTimer::ExpirationTimer (Extension * in_extension):
     list that is easy, otherwise all the entries must be found, and this
     one removed from the list.
 */
-ExpirationTimer::~ExpirationTimer(void)
+ExpirationTimer::~ExpirationTimer()
 {
     if (this != next) {
         /* This will remove this entry from the circularly linked
@@ -103,7 +103,7 @@ ExpirationTimer::~ExpirationTimer(void)
     set by \c timeout.
 */
 void
-ExpirationTimer::touch (void)
+ExpirationTimer::touch ()
 {
     Glib::TimeVal current;
     current.assign_current_time();
@@ -121,7 +121,7 @@ ExpirationTimer::touch (void)
     Checks the time against the current time.
 */
 bool
-ExpirationTimer::expired (void) const
+ExpirationTimer::expired () const
 {
     if (locked > 0) return false;
 
@@ -146,7 +146,7 @@ ExpirationTimer::expired (void) const
     will then re-add the idle loop function when it runs.
 */ 
 bool
-ExpirationTimer::idle_func (void)
+ExpirationTimer::idle_func ()
 {
     // std::cout << "Idle func pass: " << idle_cnt++ << "  timer list: " << timer_list << std::endl;
 
@@ -190,7 +190,7 @@ ExpirationTimer::idle_func (void)
     the one that unloads all the extensions.
 */
 bool
-ExpirationTimer::timer_func (void)
+ExpirationTimer::timer_func ()
 {
     // std::cout << "Timer func" << std::endl;
     idle_start = timer_list;
diff --git a/src/extension/timer.h b/src/extension/timer.h
index e00929013..c8a5be438 100644
--- a/src/extension/timer.h
+++ b/src/extension/timer.h
@@ -41,18 +41,18 @@ class ExpirationTimer {
     /** \brief What extension this function relates to */
     Extension * extension;
 
-    bool expired(void) const;
+    bool expired() const;
 
-    static bool idle_func (void);
-    static bool timer_func (void);
+    static bool idle_func ();
+    static bool timer_func ();
 
 public:
     ExpirationTimer(Extension * in_extension);
-    virtual ~ExpirationTimer(void);
+    virtual ~ExpirationTimer();
 
-    void touch (void);
-    void lock (void)   { locked++;  };
-    void unlock (void) { locked--; };
+    void touch ();
+    void lock ()   { locked++;  };
+    void unlock () { locked--; };
 
     /** \brief Set the timeout variable */
     static void set_timeout (long in_seconds) { timeout = in_seconds; };