Mario: fix modifier deletion

mario/visitors/mario_visitor.hpp

@@ -9,51 +9,51 @@
 class MarioVisitor : public SDLPP::Visitor {
 public:
     MarioVisitor(bool is_jumping, SDLPP::Scene &scene, bool &quit, int &coin_count) : jumping(is_jumping), _scene(scene), _quit(quit), _coin_count(coin_count) {}
-    virtual void visit( const SDLPP::RenderObject &obj ) override;
-    bool isOnGround() {
+    void visit( const SDLPP::RenderObject &obj ) override;
+    bool isOnGround() const {
         return onGround;
     }
-    bool isDead() {
+    bool isDead() const {
         return death;
     }
-    bool isStopped() {
+    bool isStopped() const {
         return stop;
     }
-    double newXPos() {
+    double newXPos() const {
         return newX;
     }
-    virtual void setFromId( uint64_t id ) override {
+    void setFromId( uint64_t id ) override {
         from = id;
     }
-    virtual uint64_t getFromId() override {
+    uint64_t getFromId() const override {
         return from;
     }
-    virtual void setVisitorType( uint64_t type ) override {
+    void setVisitorType( uint64_t type ) override {
         _type = type;
     }
-    virtual uint64_t getVisitorType() override {
+    uint64_t getVisitorType() const override {
         return _type;
     }
-    bool canGoLeft() {
+    bool canGoLeft() const {
         return !left;
     }
-    bool canGoRight() {
+    bool canGoRight() const {
         return !right;
     }
-    double getGroundY() {
+    double getGroundY() const {
         return groundY;
     }
-    bool topBlock() {
+    bool topBlock() const {
         return top_hit;
     }
-    bool moveTop() {
+    bool moveTop() const {
         return top_left_right && !top_hit;
     }
     const SDLPP::Vec2D<double> &getRightLeftPos() {
         return rightleftpos;
     }
 
-    bool canDestroy() {
+    bool canDestroy() const {
         return jumping && !top_hit;
     }
 
@@ -61,7 +61,7 @@ public:
         return movement_blockage;
     }
 
-    double getStopX() {
+    double getStopX() const {
         return newX;
     }
 
@@ -71,7 +71,7 @@ public:
         _coin_count++;
     }
 
-    bool hasCoin() {
+    bool hasCoin() const {
         return coin;
     }
 
@@ -95,7 +95,7 @@ private:
     double groundY = 0;
     bool death = false;
     bool stop = false;
-    double newX;
+    double newX{};
     uint64_t from = -1;
     bool left = false;
     bool right = false;