SGSubsystem classes: Subsystem and subsystem group API declaration standardisation.

This is a cleanup commit.

simgear/misc/interpolator.hxx

@@ -34,8 +34,9 @@ class SGInterpolator : public SGSubsystem
 {
 public:
     SGInterpolator() { _list = 0; }
-    virtual void init() {}
-    virtual void update(double delta_time_sec);
+
+    // Subsystem API.
+    void update(double delta_time_sec) override;
 
     // Simple method that interpolates a double property value from
     // its current value (default of zero) to the specified target

simgear/props/PropertyBasedMgr.hxx

@@ -33,9 +33,9 @@ class PropertyBasedMgr : public SGSubsystem,
                          public SGPropertyChangeListener
 {
 public:
+    // Subsystem API.
     void init() override;
     void shutdown() override;
-
     void update(double delta_time_sec) override;
 
     /**

simgear/props/PropertyInterpolationMgr.hxx

@@ -51,10 +51,8 @@ public:
 
     PropertyInterpolationMgr();
 
-    /**
-     * Update all active interpolators.
-     */
-    void update(double dt);
+    // Subsystem API.
+    void update(double dt) override;
 
     /**
      * Create a new property interpolator.

simgear/scene/tsync/terrasync.hxx

@@ -42,12 +42,13 @@ public:
     SGTerraSync();
     virtual ~SGTerraSync();
 
-    virtual void init();
-    virtual void shutdown();
-    virtual void reinit();
-    virtual void bind();
-    virtual void unbind();
-    virtual void update(double);
+    // Subsystem API.
+    void bind() override;
+    void init() override;
+    void reinit() override;
+    void shutdown() override;
+    void unbind() override;
+    void update(double) override;
 
     /// notify terrasync that the sim was repositioned, as opposed to
     /// us travelling in a direction. Avoid last_lat / last_lon blocking

simgear/sound/soundmgr.hxx

@@ -52,15 +52,18 @@ public:
     SGSoundMgr();
     ~SGSoundMgr();
 
-    void init();
-    void update(double dt);
+    // Subsystem API.
+    void init() override;
+    void reinit() override;
+    void resume() override;
+    void suspend() override;
+    void update(double dt) override;
+
+    // Subsystem identification.
+    static const char* subsystemName() { return "sound"; }
 
-    void suspend();
-    void resume();
     void stop();
 
-    void reinit();
-
     /**
      * Select a specific sound device.
      * Requires a init/reinit call before sound is actually switched.
@@ -323,8 +326,6 @@ public:
 
     bool testForError(std::string s, std::string name = "sound manager");
 
-    static const char* subsystemName() { return "sound"; };
-
 private:
     class SoundManagerPrivate;
     /// private implementation object

simgear/structure/SGPerfMon.hxx

@@ -37,10 +37,11 @@ class SGPerformanceMonitor : public SGSubsystem
 public:
     SGPerformanceMonitor(SGSubsystemMgr* subSysMgr, SGPropertyNode_ptr root);
 
-    virtual void bind   (void);
-    virtual void unbind (void);
-    virtual void init   (void);
-    virtual void update (double dt);
+    // Subsystem API.
+    void bind() override;
+    void init() override;
+    void unbind() override;
+    void update(double dt) override;
 
 private:
     static void subSystemMgrHook(void* userData, const std::string& name, SampleStatistic* timeStat);

simgear/structure/event_mgr.hxx

@@ -76,10 +76,11 @@ public:
     SGEventMgr();
     ~SGEventMgr();
 
-    virtual void init();
-    virtual void update(double delta_time_sec);
-    virtual void unbind();
-    virtual void shutdown();
+    // Subsystem API.
+    void init() override;
+    void shutdown() override;
+    void unbind() override;
+    void update(double delta_time_sec) override;
 
     void setRealtimeProperty(SGPropertyNode* node) { _rtProp = node; }
 

simgear/structure/subsystem_mgr.hxx

@@ -382,17 +382,18 @@ public:
     SGSubsystemGroup (const char *name);
     virtual ~SGSubsystemGroup ();
 
+    // Subsystem API.
+    void bind() override;
+    InitStatus incrementalInit() override;
     void init() override;
-    InitStatus incrementalInit () override;
-    void postinit () override;
-    void reinit () override;
-    void shutdown () override;
-    void bind () override;
-    void unbind () override;
-    void update (double delta_time_sec) override;
-    void suspend () override;
-    void resume () override;
-    bool is_suspended () const override;
+    void postinit() override;
+    void reinit() override;
+    void resume() override;
+    void shutdown() override;
+    void suspend() override;
+    void unbind() override;
+    void update(double delta_time_sec) override;
+    bool is_suspended() const override;
 
     virtual void set_subsystem (const std::string &name,
                                 SGSubsystem * subsystem,
@@ -506,17 +507,18 @@ public:
     SGSubsystemMgr (const char *name);
     virtual ~SGSubsystemMgr ();
 
-    void init () override;
-    InitStatus incrementalInit () override;
-    void postinit () override;
-    void reinit () override;
-    void shutdown () override;
-    void bind () override;
-    void unbind () override;
-    void update (double delta_time_sec) override;
-    void suspend () override;
-    void resume () override;
-    bool is_suspended () const override;
+    // Subsystem API.
+    void bind() override;
+    void init() override;
+    InitStatus incrementalInit() override;
+    void postinit() override;
+    void reinit() override;
+    void resume() override;
+    void shutdown() override;
+    void suspend() override;
+    void unbind() override;
+    void update(double delta_time_sec) override;
+    bool is_suspended() const override;
 
     virtual void add (const char * name,
                       SGSubsystem * subsystem,